def gather_templates_from_pdb(pdbids, uniprot_domain_regex=None, chainids=None, structure_dirs=None, loglevel=None):
"""
:param pdbids: list of str
:param uniprot_domain_regex: str
:param chainids: dict {pdbid (str): [chainid (str)]}
:param structure_dirs: list of str
:return:
"""
ensembler.utils.set_loglevel(loglevel)
manual_overrides = ensembler.core.ManualOverrides()
selected_pdbchains = None
if mpistate.rank == 0:
for pdbid in pdbids:
get_structure_files_for_single_pdbchain(pdbid, structure_dirs)
uniprot_acs = extract_uniprot_acs_from_sifts_files(pdbids)
logger.debug('Extracted UniProt ACs: {0}'.format(uniprot_acs))
uniprot_ac_query_string = ensembler.uniprot.build_uniprot_query_string_from_acs(uniprot_acs)
uniprotxml = ensembler.uniprot.get_uniprot_xml(uniprot_ac_query_string)
selected_pdbchains = extract_template_pdbchains_from_uniprot_xml(uniprotxml, uniprot_domain_regex=uniprot_domain_regex, manual_overrides=manual_overrides, specified_pdbids=pdbids, specified_chainids=chainids)
selected_pdbchains = mpistate.comm.bcast(selected_pdbchains, root=0)
logger.debug('Selected PDB chains: {0}'.format([pdbchain['templateid'] for pdbchain in selected_pdbchains]))
selected_templates = extract_template_pdb_chain_residues(selected_pdbchains)
write_template_seqs_to_fasta_file(selected_templates)
extract_template_structures_from_pdb_files(selected_templates)
write_gather_templates_from_pdb_metadata(pdbids, uniprot_domain_regex, len(selected_templates), chainids, structure_dirs)
def __init__(self, targetid, traj_filepath=None, topol_filepath=None,
models_data_filepath=None, process_only_these_templates=None, loglevel=None,
run_main=True):
"""
Makes trajectory of the model files with added hydrogens, but prior to any refinement.
For the specified target, makes a single topology pdb file, a single trajectory xtc file,
and individual pdb files for each model.
See docs on `MkTraj` for further info on paramters.
Examples
--------
MkTrajImplicitStart(targetid='EGFR_HUMAN_D0')
"""
ensembler.utils.set_loglevel(loglevel)
ensembler.core.check_project_toplevel_dir()
self.models_target_dir = os.path.join(default_project_dirnames.models, targetid)
logger.debug('Working on target %s' % targetid)
self.ensembler_stage = 'implicit-start'
self.model_filename = 'implicit-start.pdb.gz'
if traj_filepath is None:
self.traj_filepath = os.path.join(
self.models_target_dir, 'traj-{0}.xtc'.format(self.ensembler_stage)
)
else:
self.traj_filepath = traj_filepath
if topol_filepath is None:
self.topol_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-topol.pdb'.format(self.ensembler_stage)
)
else:
self.topol_filepath = topol_filepath
if models_data_filepath is None:
self.models_data_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-data.csv'.format(self.ensembler_stage)
)
else:
self.models_data_filepath = models_data_filepath
if process_only_these_templates:
self.templateids = process_only_these_templates
else:
directories = [ directory for directory in os.walk(self.models_target_dir) ]
self.templateids = directories[0][1]
if run_main:
self._gen_implicit_start_models()
self._gen_df(model_filename=self.model_filename)
self.df.to_csv(self.models_data_filepath, columns=['templateid', 'seqid'])
self._construct_traj()
self._superpose()
self._write_traj()
def _construct_traj(self):
logger.debug('Loading Trajectory object for model {0} ({1}/{2})'.format(self.df.templateid.iloc[0], 0, len(self.df.model_filepath)))
traj = mdtraj.load_pdb(self.df.model_filepath[0])
remove_disulfide_bonds_from_topology(traj.topology)
self.traj = traj
for m, model_filepath in enumerate(self.df.model_filepath[1:]):
logger.debug('Loading Trajectory object for model {0} ({1}/{2})'.format(self.df.templateid.iloc[m+1], m+1, len(self.df.model_filepath)))
traj = mdtraj.load_pdb(model_filepath)
remove_disulfide_bonds_from_topology(traj.topology)
self.traj += traj
def calc_pme_parameters(system):
"""Calculate PME parameters using scheme similar to OpenMM OpenCL platform.
Parameters
----------
system : simtk.openmm.System
The system for which parameters are to be computed.
Returns
-------
alpha : float
The PME alpha parameter
nx, ny, nz : int
The grid numbers in each dimension
"""
# Find nonbonded force.
forces = {
system.getForce(index).__class__.__name__: system.getForce(index)
for index in range(system.getNumForces())
}
force = forces['NonbondedForce']
tol = force.getEwaldErrorTolerance()
boxVectors = system.getDefaultPeriodicBoxVectors()
from numpy import sqrt, log, ceil
from math import pow
alpha = (1.0 / force.getCutoffDistance()) * sqrt(-log(2.0 * tol))
xsize = int(ceil(2 * alpha * boxVectors[0][0] / (3 * pow(tol, 0.2))))
ysize = int(ceil(2 * alpha * boxVectors[1][1] / (3 * pow(tol, 0.2))))
zsize = int(ceil(2 * alpha * boxVectors[2][2] / (3 * pow(tol, 0.2))))
logger.debug('xsize = %d, ysize = %d, zsize = %d' % (xsize, ysize, zsize))
def findLegalDimension(minimum):
while (True):
# Attempt to factor the current value.
unfactored = minimum
for factor in range(2, 8):
while (unfactored > 1) and (unfactored % factor == 0):
unfactored /= factor
if (unfactored == 1):
return int(minimum)
minimum += 1
nx = findLegalDimension(xsize)
ny = findLegalDimension(ysize)
nz = findLegalDimension(zsize)
return (alpha, nx, ny, nz)
def create_dir(dirpath, quiet=True):
"""
:param dirpath: str
"""
try:
os.makedirs(dirpath)
if not quiet:
logger.info('Created directory "%s"' % dirpath)
except OSError as e:
if e.errno == 17:
logger.debug('Directory "%s" already exists - will not overwrite' % dirpath)
else:
raise
def _mk_traj(self):
with ensembler.utils.mk_temp_dir() as tmpdir:
model_filepaths = []
for m, model_filepath_gz in enumerate(self.model_filepaths):
logger.debug('Unzipping model {0}/{1}'.format(m, len(self.model_filepaths)))
with gzip.open(model_filepath_gz) as model_file:
model_filepath = os.path.join(tmpdir, '{0}.pdb'.format(m))
model_filepaths.append(model_filepath)
model_text = model_file.read()
with open(model_filepath, 'w') as model_file:
model_file.write(model_text)
self.traj = mdtraj.load(model_filepaths)
def get_valid_templates_for_target(
target,
templates_resolved_seq,
process_only_these_templates=None,
model_seqid_cutoff=None,
model_validation_score_cutoff=None,
model_validation_score_percentile=None,
):
logger.debug("Building list of valid templates...")
models_target_dir = os.path.join(default_project_dirnames.models,
target.id)
if model_seqid_cutoff:
selected_template_ids = select_templates_by_seqid_cutoff(
target.id, seqid_cutoff=model_seqid_cutoff)
elif model_validation_score_cutoff or model_validation_score_percentile:
selected_template_ids = select_templates_by_validation_score(
targetid=target.id,
validation_score_cutoff=model_validation_score_cutoff,
validation_score_percentile=model_validation_score_percentile,
)
elif process_only_these_templates:
selected_template_ids = [
seq_obj.id for seq_obj in templates_resolved_seq
if seq_obj.id in process_only_these_templates
]
else:
selected_template_ids = [
seq_obj.id for seq_obj in templates_resolved_seq
]
valid_templates = []
for template in selected_template_ids:
# Check to make sure all files needed are present.
not_valid = False
for filename in filenames_necessary_for_fah_packaging:
fullpath = os.path.join(models_target_dir, template, filename)
if not (os.path.exists(fullpath)
or os.path.exists(fullpath + '.gz')):
not_valid = True
break
if not_valid:
continue
else:
valid_templates.append(template)
logger.debug('{} valid unique initial starting conditions found'.format(
len(valid_templates)))
return valid_templates
def _mk_traj(self):
with ensembler.utils.mk_temp_dir() as tmpdir:
model_filepaths = []
for m, model_filepath_gz in enumerate(self.model_filepaths):
logger.debug('Unzipping model {0}/{1}'.format(
m, len(self.model_filepaths)))
with gzip.open(model_filepath_gz) as model_file:
model_filepath = os.path.join(tmpdir, '{0}.pdb'.format(m))
model_filepaths.append(model_filepath)
model_text = model_file.read()
with open(model_filepath, 'w') as model_file:
model_file.write(model_text)
self.traj = mdtraj.load(model_filepaths)
def create_dir(dirpath, quiet=True):
"""
:param dirpath: str
"""
try:
os.makedirs(dirpath)
if not quiet:
logger.info('Created directory "%s"' % dirpath)
except OSError as e:
if e.errno == 17:
logger.debug('Directory "%s" already exists - will not overwrite' %
dirpath)
else:
raise
def calc_pme_parameters(system):
"""Calculate PME parameters using scheme similar to OpenMM OpenCL platform.
Parameters
----------
system : simtk.openmm.System
The system for which parameters are to be computed.
Returns
-------
alpha : float
The PME alpha parameter
nx, ny, nz : int
The grid numbers in each dimension
"""
# Find nonbonded force.
forces = { system.getForce(index).__class__.__name__ : system.getForce(index) for index in range(system.getNumForces()) }
force = forces['NonbondedForce']
tol = force.getEwaldErrorTolerance()
boxVectors = system.getDefaultPeriodicBoxVectors()
from numpy import sqrt, log, ceil
from math import pow
alpha = (1.0/force.getCutoffDistance())*sqrt(-log(2.0*tol))
xsize = int(ceil(2*alpha*boxVectors[0][0]/(3*pow(tol, 0.2))))
ysize = int(ceil(2*alpha*boxVectors[1][1]/(3*pow(tol, 0.2))))
zsize = int(ceil(2*alpha*boxVectors[2][2]/(3*pow(tol, 0.2))))
logger.debug('xsize = %d, ysize = %d, zsize = %d' % (xsize,ysize,zsize))
def findLegalDimension(minimum):
while (True):
# Attempt to factor the current value.
unfactored = minimum
for factor in range(2, 8):
while (unfactored > 1) and (unfactored%factor == 0):
unfactored /= factor
if (unfactored == 1):
return int(minimum)
minimum += 1
nx = findLegalDimension(xsize)
ny = findLegalDimension(ysize)
nz = findLegalDimension(zsize)
return (alpha, nx, ny, nz)
def molprobity_validation(targetid, ensembler_stage=None, loglevel=None):
set_loglevel(loglevel)
valid_model_ids = []
if mpistate.rank == 0:
if ensembler_stage is None:
ensembler_stage = get_most_advanced_ensembler_modeling_stage(
targetid)
valid_model_ids = get_valid_model_ids(ensembler_stage, targetid)
if ensembler_stage is None:
ensembler_stage = mpistate.comm.bcast(ensembler_stage, root=0)
valid_model_ids = mpistate.comm.bcast(valid_model_ids, root=0)
nvalid_model_ids = len(valid_model_ids)
model_structure_filename = model_filenames_by_ensembler_stage[
ensembler_stage]
models_target_dir = os.path.join(default_project_dirnames.models, targetid)
molprobity_results_filepath = os.path.join(
models_target_dir,
'validation_scores_sorted-molprobity-{}'.format(ensembler_stage))
molprobity_scores_sublist = []
for model_index in range(mpistate.rank, nvalid_model_ids, mpistate.size):
model_id = valid_model_ids[model_index]
logger.debug('MPI process {} working on model {}'.format(
mpistate.rank, model_id))
molprobity_score = run_molprobity_oneline_analysis_and_write_results(
targetid,
model_id,
ensembler_stage,
model_structure_filename=model_structure_filename,
models_target_dir=models_target_dir,
)
molprobity_scores_sublist.append((model_id, molprobity_score))
molprobity_scores_gathered_list = mpistate.comm.gather(
molprobity_scores_sublist, root=0)
if mpistate.rank == 0:
molprobity_scores_list_of_tuples = [
item for sublist in molprobity_scores_gathered_list
for item in sublist
]
molprobity_scores_sorted = sorted(molprobity_scores_list_of_tuples,
key=lambda x: x[1])
write_molprobity_scores_list(molprobity_scores_sorted,
molprobity_results_filepath)
def _construct_traj(self):
logger.debug(
'Loading Trajectory object for model {0} ({1}/{2})'.format(
self.df.templateid.iloc[0], 0, len(self.df.model_filepath)))
traj = mdtraj.load_pdb(self.df.model_filepath[0])
remove_disulfide_bonds_from_topology(traj.topology)
self.traj = traj
for m, model_filepath in enumerate(self.df.model_filepath[1:]):
logger.debug(
'Loading Trajectory object for model {0} ({1}/{2})'.format(
self.df.templateid.iloc[m + 1], m + 1,
len(self.df.model_filepath)))
traj = mdtraj.load_pdb(model_filepath)
remove_disulfide_bonds_from_topology(traj.topology)
self.traj += traj
def __init__(self, targetid, traj_filepath=None, topol_filepath=None,
models_data_filepath=None, process_only_these_templates=None, loglevel=None,
run_main=True):
"""Quick hack.
"""
ensembler.utils.set_loglevel(loglevel)
ensembler.core.check_project_toplevel_dir()
self.models_target_dir = os.path.join(default_project_dirnames.models, targetid)
logger.debug('Working on target %s' % targetid)
self.ensembler_stage = 'implicit-start'
self.model_filename = 'implicit-start.pdb.gz'
if traj_filepath is None:
self.traj_filepath = os.path.join(
self.models_target_dir, 'traj-{0}.xtc'.format(self.ensembler_stage)
)
else:
self.traj_filepath = traj_filepath
if topol_filepath is None:
self.topol_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-topol.pdb'.format(self.ensembler_stage)
)
else:
self.topol_filepath = topol_filepath
if models_data_filepath is None:
self.models_data_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-data.csv'.format(self.ensembler_stage)
)
else:
self.models_data_filepath = models_data_filepath
if process_only_these_templates:
self.templateids = process_only_these_templates
else:
self.templateids = os.walk(self.models_target_dir).next()[1]
if run_main:
self._gen_implicit_start_models()
self._gen_df(model_filename=self.model_filename)
self.df.to_csv(self.models_data_filepath, columns=['templateid', 'seqid'])
self._construct_traj()
self._superpose()
self._write_traj()
def setup_system_and_integrator_files(target, template, temperature,
collision_rate, timestep):
logger.debug(
'Copying system and integrator files for template {}'.format(template))
models_target_dir = os.path.join(default_project_dirnames.models,
target.id)
template_dir = os.path.join(models_target_dir, template)
target_project_dir = os.path.join(fah_projects_dir, target.id)
source_system_filepath = os.path.join(template_dir, 'explicit-system.xml')
source_state_filepath = os.path.join(template_dir, 'explicit-state.xml')
dest_system_filepath = os.path.join(target_project_dir, 'system.xml')
dest_integrator_filepath = os.path.join(target_project_dir,
'integrator.xml')
system = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_system_filepath))
state = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_state_filepath))
# Substitute default box vectors in system with those from state.
box_vectors = state.getPeriodicBoxVectors()
system.setDefaultPeriodicBoxVectors(*box_vectors)
# Set PME parameters explicitly to minimize discrepancy between Reference and OpenCL/CUDA if not already set explicitly.
ensure_pme_parameters_are_explicit(system)
# Create new integrator to use.
integrator = mm.LangevinIntegrator(temperature, collision_rate, timestep)
# Make sure MonteCarloBarostat temperature matches set temperature.
forces = {
system.getForce(index).__class__.__name__: system.getForce(index)
for index in range(system.getNumForces())
}
if 'MonteCarloBarostat' in forces:
forces['MonteCarloBarostat'].setTemperature(temperature)
# Serialize System.
with open(dest_system_filepath, 'w') as dest_system_file:
dest_system_file.write(mm.XmlSerializer.serialize(system))
# Serialize Integrator
with open(dest_integrator_filepath, 'w') as dest_integrator_file:
dest_integrator_file.write(mm.XmlSerializer.serialize(integrator))
return system
def sort_valid_templates_by_seqid(target, valid_templates):
logger.debug(
"Sorting templates in order of decreasing sequence identity...")
models_target_dir = os.path.join(default_project_dirnames.models,
target.id)
seqids = []
for template in valid_templates:
seqids.append(get_seqid_for_model(models_target_dir, template))
sorted_valid_templates_and_seqids = sorted(zip(valid_templates, seqids),
reverse=True,
key=lambda x: x[1])
sorted_valid_templates = zip(*sorted_valid_templates_and_seqids)[0]
return sorted_valid_templates
def setup_system_and_integrator_files(target,
template,
temperature,
collision_rate,
timestep
):
logger.debug('Copying system and integrator files for template {}'.format(template))
models_target_dir = os.path.join(default_project_dirnames.models, target.id)
template_dir = os.path.join(models_target_dir, template)
target_project_dir = os.path.join(fah_projects_dir, target.id)
source_system_filepath = os.path.join(template_dir, 'explicit-system.xml')
source_state_filepath = os.path.join(template_dir, 'explicit-state.xml')
dest_system_filepath = os.path.join(target_project_dir, 'system.xml')
dest_integrator_filepath = os.path.join(target_project_dir, 'integrator.xml')
system = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_system_filepath)
)
state = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_state_filepath)
)
# Substitute default box vectors in system with those from state.
box_vectors = state.getPeriodicBoxVectors()
system.setDefaultPeriodicBoxVectors(*box_vectors)
# Set PME parameters explicitly to minimize discrepancy between Reference and OpenCL/CUDA if not already set explicitly.
ensure_pme_parameters_are_explicit(system)
# Create new integrator to use.
integrator = mm.LangevinIntegrator(temperature, collision_rate, timestep)
# Make sure MonteCarloBarostat temperature matches set temperature.
forces = { system.getForce(index).__class__.__name__ : system.getForce(index) for index in range(system.getNumForces()) }
if 'MonteCarloBarostat' in forces:
forces['MonteCarloBarostat'].setTemperature(temperature)
# Serialize System.
with open(dest_system_filepath, 'w') as dest_system_file:
dest_system_file.write(mm.XmlSerializer.serialize(system))
# Serialize Integrator
with open(dest_integrator_filepath, 'w') as dest_integrator_file:
dest_integrator_file.write(mm.XmlSerializer.serialize(integrator))
return system
def sort_valid_templates_by_seqid(target, valid_templates):
logger.debug("Sorting templates in order of decreasing sequence identity...")
models_target_dir = os.path.join(default_project_dirnames.models, target.id)
seqids = []
for template in valid_templates:
seqids.append(get_seqid_for_model(models_target_dir, template))
sorted_valid_templates_and_seqids = sorted(
zip(valid_templates, seqids),
reverse=True,
key=lambda x: x[1]
)
sorted_valid_templates = zip(*sorted_valid_templates_and_seqids)[0]
return sorted_valid_templates
def get_valid_templates_for_target(target,
templates_resolved_seq,
process_only_these_templates=None,
model_seqid_cutoff=None,
model_validation_score_cutoff=None,
model_validation_score_percentile=None,
):
logger.debug("Building list of valid templates...")
models_target_dir = os.path.join(default_project_dirnames.models, target.id)
if model_seqid_cutoff:
selected_template_ids = select_templates_by_seqid_cutoff(
target.id, seqid_cutoff=model_seqid_cutoff
)
elif model_validation_score_cutoff or model_validation_score_percentile:
selected_template_ids = select_templates_by_validation_score(
targetid=target.id,
validation_score_cutoff=model_validation_score_cutoff,
validation_score_percentile=model_validation_score_percentile,
)
elif process_only_these_templates:
selected_template_ids = [
seq_obj.id for seq_obj in templates_resolved_seq
if seq_obj.id in process_only_these_templates
]
else:
selected_template_ids = [seq_obj.id for seq_obj in templates_resolved_seq]
valid_templates = []
for template in selected_template_ids:
# Check to make sure all files needed are present.
not_valid = False
for filename in filenames_necessary_for_fah_packaging:
fullpath = os.path.join(models_target_dir, template, filename)
if not (os.path.exists(fullpath) or os.path.exists(fullpath+'.gz')):
not_valid = True
break
if not_valid:
continue
else:
valid_templates.append(template)
logger.debug('{} valid unique initial starting conditions found'.format(len(valid_templates)))
return valid_templates
def gather_templates_from_pdb(pdbids,
uniprot_domain_regex=None,
chainids=None,
structure_dirs=None,
loglevel=None):
"""
:param pdbids: list of str
:param uniprot_domain_regex: str
:param chainids: dict {pdbid (str): [chainid (str)]}
:param structure_dirs: list of str
:return:
"""
ensembler.utils.set_loglevel(loglevel)
manual_overrides = ensembler.core.ManualOverrides()
selected_pdbchains = None
if mpistate.rank == 0:
for pdbid in pdbids:
get_structure_files_for_single_pdbchain(pdbid, structure_dirs)
uniprot_acs = extract_uniprot_acs_from_sifts_files(pdbids)
logger.debug('Extracted UniProt ACs: {0}'.format(uniprot_acs))
uniprot_ac_query_string = ensembler.uniprot.build_uniprot_query_string_from_acs(
uniprot_acs)
uniprotxml = ensembler.uniprot.get_uniprot_xml(uniprot_ac_query_string)
selected_pdbchains = extract_template_pdbchains_from_uniprot_xml(
uniprotxml,
uniprot_domain_regex=uniprot_domain_regex,
manual_overrides=manual_overrides,
specified_pdbids=pdbids,
specified_chainids=chainids)
selected_pdbchains = mpistate.comm.bcast(selected_pdbchains, root=0)
logger.debug('Selected PDB chains: {0}'.format(
[pdbchain['templateid'] for pdbchain in selected_pdbchains]))
selected_templates = extract_template_pdb_chain_residues(
selected_pdbchains)
write_template_seqs_to_fasta_file(selected_templates)
extract_template_structures_from_pdb_files(selected_templates)
write_gather_templates_from_pdb_metadata(pdbids, uniprot_domain_regex,
len(selected_templates), chainids,
structure_dirs)
def gather_templates_from_uniprot(uniprot_query_string, uniprot_domain_regex=None, structure_dirs=None, pdbids=None, chainids=None, loglevel=None):
"""# Searches UniProt for a set of template proteins with a user-defined
query string, then saves IDs, sequences and structures."""
ensembler.utils.set_loglevel(loglevel)
manual_overrides = ensembler.core.ManualOverrides()
selected_pdbchains = None
if mpistate.rank == 0:
uniprotxml = ensembler.uniprot.get_uniprot_xml(uniprot_query_string)
log_unique_domain_names(uniprot_query_string, uniprotxml)
if uniprot_domain_regex is not None:
log_unique_domain_names_selected_by_regex(uniprot_domain_regex, uniprotxml)
selected_pdbchains = extract_template_pdbchains_from_uniprot_xml(uniprotxml, uniprot_domain_regex=uniprot_domain_regex, manual_overrides=manual_overrides, specified_pdbids=pdbids, specified_chainids=chainids)
get_structure_files(selected_pdbchains, structure_dirs)
selected_pdbchains = mpistate.comm.bcast(selected_pdbchains, root=0)
logger.debug('Selected PDB chains: {0}'.format([pdbchain['templateid'] for pdbchain in selected_pdbchains]))
selected_templates = extract_template_pdb_chain_residues(selected_pdbchains)
write_template_seqs_to_fasta_file(selected_templates)
extract_template_structures_from_pdb_files(selected_templates)
write_gather_templates_from_uniprot_metadata(uniprot_query_string, uniprot_domain_regex, len(selected_templates), structure_dirs)
def molprobity_validation(targetid, ensembler_stage=None, loglevel=None):
set_loglevel(loglevel)
valid_model_ids = []
if mpistate.rank == 0:
if ensembler_stage is None:
ensembler_stage = get_most_advanced_ensembler_modeling_stage(targetid)
valid_model_ids = get_valid_model_ids(ensembler_stage, targetid)
if ensembler_stage is None:
ensembler_stage = mpistate.comm.bcast(ensembler_stage, root=0)
valid_model_ids = mpistate.comm.bcast(valid_model_ids, root=0)
nvalid_model_ids = len(valid_model_ids)
model_structure_filename = model_filenames_by_ensembler_stage[ensembler_stage]
models_target_dir = os.path.join(default_project_dirnames.models, targetid)
molprobity_results_filepath = os.path.join(
models_target_dir, "validation_scores_sorted-molprobity-{}".format(ensembler_stage)
)
molprobity_scores_sublist = []
for model_index in range(mpistate.rank, nvalid_model_ids, mpistate.size):
model_id = valid_model_ids[model_index]
logger.debug("MPI process {} working on model {}".format(mpistate.rank, model_id))
molprobity_score = run_molprobity_oneline_analysis_and_write_results(
targetid,
model_id,
ensembler_stage,
model_structure_filename=model_structure_filename,
models_target_dir=models_target_dir,
)
molprobity_scores_sublist.append((model_id, molprobity_score))
molprobity_scores_gathered_list = mpistate.comm.gather(molprobity_scores_sublist, root=0)
if mpistate.rank == 0:
molprobity_scores_list_of_tuples = [item for sublist in molprobity_scores_gathered_list for item in sublist]
molprobity_scores_sorted = sorted(molprobity_scores_list_of_tuples, key=lambda x: x[1])
write_molprobity_scores_list(molprobity_scores_sorted, molprobity_results_filepath)
def gather_templates_from_uniprot(uniprot_query_string,
uniprot_domain_regex=None,
structure_dirs=None,
pdbids=None,
chainids=None,
loglevel=None):
"""# Searches UniProt for a set of template proteins with a user-defined
query string, then saves IDs, sequences and structures."""
ensembler.utils.set_loglevel(loglevel)
manual_overrides = ensembler.core.ManualOverrides()
selected_pdbchains = None
if mpistate.rank == 0:
uniprotxml = ensembler.uniprot.get_uniprot_xml(uniprot_query_string)
log_unique_domain_names(uniprot_query_string, uniprotxml)
if uniprot_domain_regex is not None:
log_unique_domain_names_selected_by_regex(uniprot_domain_regex,
uniprotxml)
selected_pdbchains = extract_template_pdbchains_from_uniprot_xml(
uniprotxml,
uniprot_domain_regex=uniprot_domain_regex,
manual_overrides=manual_overrides,
specified_pdbids=pdbids,
specified_chainids=chainids)
get_structure_files(selected_pdbchains, structure_dirs)
selected_pdbchains = mpistate.comm.bcast(selected_pdbchains, root=0)
logger.debug('Selected PDB chains: {0}'.format(
[pdbchain['templateid'] for pdbchain in selected_pdbchains]))
selected_templates = extract_template_pdb_chain_residues(
selected_pdbchains)
write_template_seqs_to_fasta_file(selected_templates)
extract_template_structures_from_pdb_files(selected_templates)
write_gather_templates_from_uniprot_metadata(uniprot_query_string,
uniprot_domain_regex,
len(selected_templates),
structure_dirs)
def run_molprobity_oneline_analysis_and_write_results(
targetid,
model_id,
ensembler_stage,
model_structure_filename=None,
models_target_dir=None,
check_for_existing_results=True,
):
if model_structure_filename is None:
model_structure_filename = model_filenames_by_ensembler_stage[
ensembler_stage]
if models_target_dir is None:
models_target_dir = os.path.join(default_project_dirnames.models,
targetid)
results_output_filepath = os.path.join(
models_target_dir, model_id,
'molprobity-{}.yaml'.format(ensembler_stage))
if check_for_existing_results:
if os.path.exists(results_output_filepath):
with open(results_output_filepath) as results_output_file:
prev_results = yaml.load(stream=results_output_file,
Loader=YamlLoader)
prev_molprobity_score = prev_results.get('MolProbityScore')
if prev_molprobity_score is not None:
logger.debug(
'Existing MolProbity score of {} found for model {}'.
format(prev_molprobity_score, model_id))
return prev_molprobity_score
molprobity_results = run_molprobity_oneline_analysis(
targetid, model_id, model_structure_filename)
if molprobity_results is None:
logger.debug(
'MolProbity returned no results for model {}'.format(model_id))
return None
logger.debug('MolProbity score of {} calculated for model {}'.format(
molprobity_results.get('MolProbityScore'), model_id))
molprobity_score = molprobity_results.get('MolProbityScore')
if molprobity_score is not None:
write_molprobity_results_for_target(molprobity_results,
models_target_dir, model_id,
ensembler_stage)
return molprobity_score
def run_molprobity_oneline_analysis_and_write_results(
targetid,
model_id,
ensembler_stage,
model_structure_filename=None,
models_target_dir=None,
check_for_existing_results=True,
):
if model_structure_filename is None:
model_structure_filename = model_filenames_by_ensembler_stage[ensembler_stage]
if models_target_dir is None:
models_target_dir = os.path.join(default_project_dirnames.models, targetid)
results_output_filepath = os.path.join(models_target_dir, model_id, "molprobity-{}.yaml".format(ensembler_stage))
if check_for_existing_results:
if os.path.exists(results_output_filepath):
with open(results_output_filepath) as results_output_file:
prev_results = yaml.load(stream=results_output_file, Loader=YamlLoader)
prev_molprobity_score = prev_results.get("MolProbityScore")
if prev_molprobity_score is not None:
logger.debug(
"Existing MolProbity score of {} found for model {}".format(prev_molprobity_score, model_id)
)
return prev_molprobity_score
molprobity_results = run_molprobity_oneline_analysis(targetid, model_id, model_structure_filename)
if molprobity_results is None:
logger.debug("MolProbity returned no results for model {}".format(model_id))
return None
logger.debug(
"MolProbity score of {} calculated for model {}".format(molprobity_results.get("MolProbityScore"), model_id)
)
molprobity_score = molprobity_results.get("MolProbityScore")
if molprobity_score is not None:
write_molprobity_results_for_target(molprobity_results, models_target_dir, model_id, ensembler_stage)
return molprobity_score
def build_model(target,
template_resolved_seq,
target_setup_data,
write_modeller_restraints_file=False,
loglevel=None):
"""Uses Modeller to build a homology model for a given target and
template.
Will not run Modeller if the output files already exist.
Parameters
----------
target : BioPython SeqRecord
template_resolved_seq : BioPython SeqRecord
Must be a corresponding .pdb template file with the same ID in the
templates/structures directory.
template_resolved_seq : BioPython SeqRecord
Must be a corresponding .pdb template file with the same ID in the
templates/structures directory.
target_setup_data : TargetSetupData obj
write_modeller_restraints_file : bool
Write file containing restraints used by Modeller - note that this file can be relatively
large, e.g. ~300KB per model for a protein kinase domain target.
loglevel : bool
"""
ensembler.utils.set_loglevel(loglevel)
template_structure_dir = os.path.abspath(
ensembler.core.default_project_dirnames.
templates_structures_modeled_loops)
if os.path.exists(
os.path.join(template_structure_dir,
template_resolved_seq.id + '.pdb')):
remodeled_seq_filepath = os.path.join(
ensembler.core.default_project_dirnames.
templates_structures_modeled_loops,
template_resolved_seq.id + '-pdbfixed.fasta')
template = list(Bio.SeqIO.parse(remodeled_seq_filepath, 'fasta'))[0]
else:
template = template_resolved_seq
template_structure_dir = os.path.abspath(
ensembler.core.default_project_dirnames.
templates_structures_resolved)
model_dir = os.path.abspath(
os.path.join(target_setup_data.models_target_dir, template.id))
if not os.path.exists(model_dir):
ensembler.utils.create_dir(model_dir)
model_pdbfilepath = os.path.abspath(os.path.join(model_dir,
'model.pdb.gz'))
modeling_log_filepath = os.path.abspath(
os.path.join(model_dir, 'modeling-log.yaml'))
check_model_pdbfilepath_ends_in_pdbgz(model_pdbfilepath)
model_pdbfilepath_uncompressed = model_pdbfilepath[:-3]
if check_all_model_files_present(model_dir):
logger.debug(
"Output files already exist for target '%s' // template '%s'; files were not overwritten."
% (target.id, template.id))
return
logger.info(
'-------------------------------------------------------------------------\n'
'Modelling "%s" => "%s"\n'
'-------------------------------------------------------------------------'
% (target.id, template.id))
# aln = align_target_template(target, template)
aln_filepath = os.path.abspath(os.path.join(model_dir, 'alignment.pir'))
# write_modeller_pir_aln_file(aln, target, template, pir_aln_filepath=aln_filepath)
log_file = init_build_model_logfile(modeling_log_filepath)
with ensembler.utils.enter_temp_dir():
try:
start = datetime.datetime.utcnow()
shutil.copy(aln_filepath, 'alignment.pir')
run_modeller(
target,
template,
model_dir,
model_pdbfilepath,
model_pdbfilepath_uncompressed,
template_structure_dir,
write_modeller_restraints_file=write_modeller_restraints_file)
if os.path.getsize(model_pdbfilepath) < 1:
raise Exception('Output PDB file is empty.')
end_successful_build_model_logfile(log_file, start)
except Exception as e:
end_exception_build_model_logfile(e, log_file)
def package_for_fah(process_only_these_targets=None,
process_only_these_templates=None,
model_seqid_cutoff=None,
model_validation_score_cutoff=None,
model_validation_score_percentile=None,
nclones=1,
archive=False,
openmm_platform='Reference',
temperature=300.0 * unit.kelvin,
collision_rate=1.0 / unit.picosecond,
timestep=2.0 * unit.femtoseconds,
loglevel=None):
"""
Create the input files and directory structure necessary to start a Folding@Home project.
MPI-enabled.
Parameters
----------
archive : Bool
A .tgz compressed archive will be created for each individual RUN directory.
"""
set_loglevel(loglevel)
if mpistate.rank == 0:
if not os.path.exists(fah_projects_dir):
os.mkdir(fah_projects_dir)
mpistate.comm.Barrier()
targets, templates_resolved_seq = get_targets_and_templates()
for target in targets:
if process_only_these_targets and (target.id
not in process_only_these_targets):
continue
target_project_dir = os.path.join(fah_projects_dir, target.id)
models_target_dir = os.path.join(default_project_dirnames.models,
target.id)
if not os.path.exists(models_target_dir):
continue
mpistate.comm.Barrier()
sorted_valid_templates = []
system = None
renumbered_resnums = {}
if mpistate.rank == 0:
logger.info(
'-------------------------------------------------------------------------'
)
logger.info('Building FAH OpenMM project for target {}'.format(
target.id))
logger.info(
'-------------------------------------------------------------------------'
)
valid_templates = get_valid_templates_for_target(
target,
templates_resolved_seq,
process_only_these_templates=process_only_these_templates,
model_seqid_cutoff=model_seqid_cutoff,
model_validation_score_cutoff=model_validation_score_cutoff,
model_validation_score_percentile=
model_validation_score_percentile)
sorted_valid_templates = sort_valid_templates_by_seqid(
target, valid_templates)
create_target_project_dir(target)
system = setup_system_and_integrator_files(
target, sorted_valid_templates[0], temperature, collision_rate,
timestep)
renumbered_resnums = get_renumbered_topol_resnums(target)
sorted_valid_templates = mpistate.comm.bcast(sorted_valid_templates,
root=0)
system = mpistate.comm.bcast(system, root=0)
renumbered_resnums = mpistate.comm.bcast(renumbered_resnums, root=0)
logger.debug("Building RUNs in parallel...")
for run_index in range(mpistate.rank, len(sorted_valid_templates),
mpistate.size):
template = sorted_valid_templates[run_index]
logger.info(
'-------------------------------------------------------------------------'
)
logger.info('Building RUN{} for template {}'.format(
run_index, template))
logger.info(
'-------------------------------------------------------------------------'
)
source_dir = os.path.join(models_target_dir, template)
generate_fah_run(
target_project_dir,
template,
source_dir,
system,
run_index,
nclones,
temperature,
collision_rate,
timestep,
openmm_platform,
renumbered_resnums,
)
if archive:
tgz_fah_run(target, run_index)
mpistate.comm.Barrier()
if mpistate.rank == 0:
logger.info('Done.')
def mktraj(targetid, ensembler_stage=None, traj_filepath=None, topol_filepath=None, models_data_filepath=None, process_only_these_templates=None):
"""Makes a trajectory for a given target, using mdtraj. The trajectory can be used with other
software, e.g. for visualization with PyMOL or VMD.
Parameters
----------
targetid : str
e.g. 'EGFR_HUMAN_D0'
ensembler_stage : str
The Ensembler stage from which to build models, e.g. 'build_models' results in a trajectory
built from the 'model.pdb.gz' files output by the build_models command.
options: build_models|refine_implicit_md|refine_explicit_md
default: most advanced stage for which model files are available
traj_filepath : str
default: models/[targetid]/traj-[ensembler_stage].xtc
topol_filepath : str
default: models/[targetid]/traj-[ensembler_stage]-topol.pdb
models_data_filepath :
default: models/[targetid]/traj-[ensembler_stage]-data.csv
process_only_these_templates : list of str
Returns
-------
traj : mdtraj.Trajectory
df : pandas.DataFrame
models data (e.g. sequence identities):
"""
ensembler.core.check_project_toplevel_dir()
models_target_dir = os.path.join(ensembler.core.default_project_dirnames.models, targetid)
logger.debug('Working on target %s' % targetid)
if ensembler_stage is None:
for stagename in ['refine_explicit_md', 'refine_implicit_md', 'build_models']:
if check_ensembler_modeling_stage_complete(stagename, targetid):
ensembler_stage = stagename
break
if ensembler_stage is None:
raise Exception('Models have not yet been built for this Ensembler project.')
if traj_filepath is None:
traj_filepath = os.path.join(models_target_dir, 'traj-{0}.xtc'.format(ensembler_stage))
if topol_filepath is None:
topol_filepath = os.path.join(models_target_dir, 'traj-{0}-topol.pdb'.format(ensembler_stage))
if models_data_filepath is None:
models_data_filepath = os.path.join(models_target_dir, 'traj-{0}-data.csv'.format(ensembler_stage))
if process_only_these_templates:
templateids = process_only_these_templates
else:
dirs = os.walk(models_target_dir).next()[1]
templateids = [dir for dir in dirs if '_D' in dir]
model_filename = ensembler.core.model_filenames_by_ensembler_stage[ensembler_stage]
valid_model_templateids = [templateid for templateid in templateids if os.path.exists(os.path.join(models_target_dir, templateid, model_filename))]
valid_model_filepaths = [os.path.join(models_target_dir, templateid, model_filename) for templateid in valid_model_templateids]
seqid_filepaths = [os.path.join(models_target_dir, templateid, 'sequence-identity.txt') for templateid in valid_model_templateids]
seqids = [float(open(seqid_filepath).read().strip()) if os.path.exists(seqid_filepath) else None for seqid_filepath in seqid_filepaths]
df = pd.DataFrame({
'templateid': valid_model_templateids,
'model_filepath': valid_model_filepaths,
'seqid': seqids,
})
df.sort(columns='seqid', inplace=True, ascending=False)
df.reset_index(drop=True, inplace=True)
df.to_csv(models_data_filepath, columns=['templateid', 'seqid'])
# construct traj
traj = mdtraj.load_pdb(df.model_filepath[0])
for model_filepath in df.model_filepath[1:]:
traj += mdtraj.load_pdb(model_filepath)
# superpose structured C-alphas
dssp = mdtraj.compute_dssp(traj[0])[0]
structured_resis_bool = (dssp == 'H') + (dssp == 'E')
alpha_indices = traj.topology.select_atom_indices('alpha')
structured_alpha_indices = np.array([alpha_indices[x] for x in range(traj.n_residues) if structured_resis_bool[x]])
traj.superpose(reference=traj, frame=0, atom_indices=structured_alpha_indices)
# write traj, and write first frame as pdb file
traj[0].save(topol_filepath)
traj.save(traj_filepath)
return traj, df
def build_model(target, template_resolved_seq, target_setup_data,
write_modeller_restraints_file=False, loglevel=None):
"""Uses Modeller to build a homology model for a given target and
template.
Will not run Modeller if the output files already exist.
Parameters
----------
target : BioPython SeqRecord
template_resolved_seq : BioPython SeqRecord
Must be a corresponding .pdb template file with the same ID in the
templates/structures directory.
template_resolved_seq : BioPython SeqRecord
Must be a corresponding .pdb template file with the same ID in the
templates/structures directory.
target_setup_data : TargetSetupData obj
write_modeller_restraints_file : bool
Write file containing restraints used by Modeller - note that this file can be relatively
large, e.g. ~300KB per model for a protein kinase domain target.
loglevel : bool
"""
ensembler.utils.set_loglevel(loglevel)
template_structure_dir = os.path.abspath(
ensembler.core.default_project_dirnames.templates_structures_modeled_loops
)
if os.path.exists(os.path.join(template_structure_dir, template_resolved_seq.id + '.pdb')):
remodeled_seq_filepath = os.path.join(
ensembler.core.default_project_dirnames.templates_structures_modeled_loops,
template_resolved_seq.id + '-pdbfixed.fasta'
)
template = list(Bio.SeqIO.parse(remodeled_seq_filepath, 'fasta'))[0]
else:
template = template_resolved_seq
template_structure_dir = os.path.abspath(
ensembler.core.default_project_dirnames.templates_structures_resolved
)
model_dir = os.path.abspath(os.path.join(target_setup_data.models_target_dir, template.id))
if not os.path.exists(model_dir):
ensembler.utils.create_dir(model_dir)
model_pdbfilepath = os.path.abspath(os.path.join(model_dir, 'model.pdb.gz'))
modeling_log_filepath = os.path.abspath(os.path.join(model_dir, 'modeling-log.yaml'))
check_model_pdbfilepath_ends_in_pdbgz(model_pdbfilepath)
model_pdbfilepath_uncompressed = model_pdbfilepath[:-3]
if check_all_model_files_present(model_dir):
logger.debug(
"Output files already exist for target '%s' // template '%s'; files were not overwritten." %
(target.id, template.id)
)
return
logger.info(
'-------------------------------------------------------------------------\n'
'Modelling "%s" => "%s"\n'
'-------------------------------------------------------------------------'
% (target.id, template.id)
)
# aln = align_target_template(target, template)
aln_filepath = os.path.abspath(os.path.join(model_dir, 'alignment.pir'))
# write_modeller_pir_aln_file(aln, target, template, pir_aln_filepath=aln_filepath)
log_file = init_build_model_logfile(modeling_log_filepath)
with ensembler.utils.enter_temp_dir():
try:
start = datetime.datetime.utcnow()
shutil.copy(aln_filepath, 'alignment.pir')
run_modeller(target, template, model_dir, model_pdbfilepath,
model_pdbfilepath_uncompressed, template_structure_dir,
write_modeller_restraints_file=write_modeller_restraints_file)
if os.path.getsize(model_pdbfilepath) < 1:
raise Exception('Output PDB file is empty.')
end_successful_build_model_logfile(log_file, start)
except Exception as e:
end_exception_build_model_logfile(e, log_file)
def cluster_models(process_only_these_targets=None, cutoff=0.06, loglevel=None):
"""Cluster models based on RMSD, and filter out non-unique models as
determined by a given cutoff.
Parameters
----------
cutoff : float
Minimum distance cutoff for RMSD clustering (nm)
Runs serially.
"""
# TODO refactor
ensembler.utils.set_loglevel(loglevel)
targets, templates_resolved_seq = get_targets_and_templates()
templates = templates_resolved_seq
for target in targets:
if process_only_these_targets and (target.id not in process_only_these_targets): continue
models_target_dir = os.path.join(ensembler.core.default_project_dirnames.models, target.id)
if not os.path.exists(models_target_dir): continue
# =============================
# Construct a mdtraj trajectory containing all models
# =============================
starttime = datetime.datetime.utcnow()
logger.debug('Building a list of valid models...')
model_pdbfilenames_compressed = {
template.id: os.path.join(models_target_dir, template.id, 'model.pdb.gz') for template in templates
}
model_pdbfilenames_uncompressed = {
template.id: os.path.join(models_target_dir, template.id, 'model.pdb') for template in templates
}
valid_templateids = [
templateid for templateid in model_pdbfilenames_compressed
if os.path.exists(model_pdbfilenames_compressed[templateid])
]
# Write uncompressed model.pdb files from model.pdb.gz if necessary
for templateid in valid_templateids:
if not os.path.exists(model_pdbfilenames_uncompressed[templateid]) or os.path.getsize(model_pdbfilenames_uncompressed[templateid]) == 0:
with gzip.open(model_pdbfilenames_compressed[templateid]) as model_pdbfile_compressed:
with open(model_pdbfilenames_uncompressed[templateid], 'w') as model_pdbfile:
model_pdbfile.write(model_pdbfile_compressed.read())
logger.info('Constructing a trajectory containing all valid models...')
if len(valid_templateids) == 0:
logger.info('No models found for target {0}.'.format(target.id))
continue
valid_model_pdbfilenames_uncompressed = [
model_pdbfilenames_uncompressed[templateid] for templateid in valid_templateids
]
traj = mdtraj.load(valid_model_pdbfilenames_uncompressed)
# =============================
# Clustering
# =============================
logger.info('Conducting RMSD-based clustering...')
# Remove any existing unique_by_clustering files
for f in glob.glob(models_target_dir+'/*_PK_*/unique_by_clustering'):
os.unlink(f)
CAatoms = [a.index for a in traj.topology.atoms if a.name == 'CA']
unique_templateids = models_regular_spatial_clustering(
valid_templateids, traj, atom_indices=CAatoms, cutoff=cutoff
)
write_unique_by_clustering_files(unique_templateids, models_target_dir)
with open(os.path.join(models_target_dir, 'unique-models.txt'), 'w') as uniques_file:
for u in unique_templateids:
uniques_file.write(u+'\n')
logger.info(
'%d unique models (from original set of %d) using cutoff of %.3f nm' %
(len(unique_templateids), len(valid_templateids), cutoff)
)
for template in templates:
model_dir = os.path.join(models_target_dir, template.id)
model_pdbfilename = os.path.join(model_dir, 'model.pdb')
if os.path.exists(model_pdbfilename):
os.remove(model_pdbfilename)
# ========
# Metadata
# ========
project_metadata = ensembler.core.ProjectMetadata(
project_stage='cluster_models', target_id=target.id
)
datestamp = ensembler.core.get_utcnow_formatted()
timedelta = datetime.datetime.utcnow() - starttime
metadata = {
'target_id': target.id,
'datestamp': datestamp,
'nunique_models': len(unique_templateids),
'python_version': sys.version.split('|')[0].strip(),
'python_full_version': ensembler.core.literal_str(sys.version),
'ensembler_version': ensembler.version.short_version,
'ensembler_commit': ensembler.version.git_revision,
'biopython_version': Bio.__version__,
'mdtraj_version': mdtraj.version.short_version,
'mdtraj_commit': mdtraj.version.git_revision,
'timing': ensembler.core.strf_timedelta(timedelta),
}
project_metadata.add_data(metadata)
project_metadata.write()
def _gen_implicit_start_models(self,
ff='amber99sbildn.xml',
implicit_water_model='amber99_obc.xml',
ph=8.0):
self.ph = ph
from simtk.openmm import app
valid_model_templateids = [
templateid for templateid in self.templateids if os.path.exists(
os.path.join(
self.models_target_dir, templateid, ensembler.core.
model_filenames_by_ensembler_stage['refine_implicit_md']))
]
gen_model_templateids = [
templateid for templateid in valid_model_templateids
if not os.path.exists(
os.path.join(self.models_target_dir, templateid,
self.model_filename))
]
# make reference model
forcefield = app.ForceField(ff, implicit_water_model)
reference_model_id = get_highest_seqid_existing_model(
models_target_dir=self.models_target_dir)
logger.debug('Using {0} as reference model'.format(reference_model_id))
reference_model_path = os.path.join(
self.models_target_dir, reference_model_id,
model_filenames_by_ensembler_stage['build_models'])
with gzip.open(reference_model_path) as reference_pdb_file:
reference_pdb = app.PDBFile(reference_pdb_file)
remove_disulfide_bonds_from_topology(reference_pdb.topology)
reference_topology = reference_pdb.topology
reference_modeller = app.Modeller(reference_pdb.topology,
reference_pdb.positions)
reference_variants = reference_modeller.addHydrogens(forcefield,
pH=self.ph)
for template_index in range(mpistate.rank, len(gen_model_templateids),
mpistate.size):
templateid = gen_model_templateids[template_index]
logger.debug(
'Generating implicit-start model for {0}'.format(templateid))
try:
input_model_filepath = os.path.join(
self.models_target_dir, templateid,
model_filenames_by_ensembler_stage['build_models'])
output_model_filepath = os.path.join(self.models_target_dir,
templateid,
self.model_filename)
with gzip.open(input_model_filepath) as pdb_file:
pdb = app.PDBFile(pdb_file)
remove_disulfide_bonds_from_topology(pdb.topology)
modeller = app.Modeller(reference_topology, pdb.positions)
modeller.addHydrogens(forcefield,
pH=self.ph,
variants=reference_variants)
topology = modeller.getTopology()
positions = modeller.getPositions()
with gzip.open(output_model_filepath,
'wt') as output_model_file:
app.PDBFile.writeHeader(topology, file=output_model_file)
app.PDBFile.writeFile(topology,
positions,
file=output_model_file)
app.PDBFile.writeFooter(topology, file=output_model_file)
except Exception as e:
print('Error for model {0}: {1}'.format(templateid, e))
continue
def pdbfix_template(template_full_seq, overwrite_structures=False):
"""
Parameters
----------
template_full_seq: BioPython SeqRecord
full UniProt sequence for span of the template (including unresolved residues)
overwrite_structures: bool
Returns
-------
fixer.missingResidues
"""
try:
template_pdbfixed_filepath = os.path.join(
ensembler.core.default_project_dirnames.templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixed.pdb'
)
seq_pdbfixed_filepath = os.path.join(
ensembler.core.default_project_dirnames.templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixed.fasta'
)
import pdbfixer
import simtk.openmm.app
template_filepath = os.path.join(
ensembler.core.default_project_dirnames.templates_structures_resolved,
template_full_seq.id + '.pdb'
)
fixer = pdbfixer.PDBFixer(filename=template_filepath)
chainid = next(fixer.structure.iter_chains()).chain_id
seq_obj = simtk.openmm.app.internal.pdbstructure.Sequence(chainid)
for r in template_full_seq.seq:
resi3 = Bio.SeqUtils.seq3(r).upper()
seq_obj.residues.append(resi3)
fixer.structure.sequences.append(seq_obj)
fixer.findMissingResidues()
remove_missing_residues_at_termini(fixer, len_full_seq=len(template_full_seq.seq))
if not overwrite_structures and os.path.exists(template_pdbfixed_filepath):
return fixer.missingResidues
fixer.findMissingAtoms()
(newTopology, newPositions, newAtoms, existingAtomMap) = fixer._addAtomsToTopology(True, True)
fixer.topology = newTopology
fixer.positions = newPositions
with open(template_pdbfixed_filepath, 'w') as template_pdbfixed_file:
simtk.openmm.app.PDBFile.writeFile(
fixer.topology, fixer.positions, file=template_pdbfixed_file
)
# Write sequence to file
seq_pdbfixed = ''.join([Bio.SeqUtils.seq1(r.name) for r in fixer.topology.residues()])
seq_record_pdbfixed = SeqRecord(Seq(seq_pdbfixed), id=template_full_seq.id, description=template_full_seq.id)
Bio.SeqIO.write([seq_record_pdbfixed], seq_pdbfixed_filepath, 'fasta')
return fixer.missingResidues
except (KeyboardInterrupt, ImportError):
raise
except Exception as e:
trbk = traceback.format_exc()
log_filepath = os.path.abspath(os.path.join(
ensembler.core.default_project_dirnames.templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixer-log.yaml'
))
logfile = ensembler.core.LogFile(log_filepath)
logfile.log({
'templateid': str(template_full_seq.id),
'exception': e,
'traceback': ensembler.core.literal_str(trbk),
'mpi_rank': mpistate.rank,
})
logger.error(
'MPI rank %d pdbfixer error for template %s - see logfile' %
(mpistate.rank, template_full_seq.id)
)
logger.debug(e)
logger.debug(trbk)
def refine_implicit_md(
openmm_platform=None, gpupn=1, process_only_these_targets=None,
process_only_these_templates=None, model_seqid_cutoff=None,
write_trajectory=False,
include_disulfide_bonds=False,
custom_residue_variants=None,
ff='amber99sbildn',
implicit_water_model='amber99_obc',
sim_length=100.0 * unit.picoseconds,
timestep=2.0 * unit.femtoseconds, # timestep
temperature=300.0 * unit.kelvin, # simulation temperature
collision_rate=20.0 / unit.picoseconds, # Langevin collision rate
cutoff=None, # nonbonded cutoff
minimization_tolerance=10.0 * unit.kilojoules_per_mole / unit.nanometer,
minimization_steps=20,
nsteps_per_iteration=500,
ph=None,
retry_failed_runs=False,
cpu_platform_threads=1,
loglevel=None):
# TODO - refactor
"""Run MD refinement in implicit solvent.
MPI-enabled.
"""
ensembler.utils.set_loglevel(loglevel)
gpuid = mpistate.rank % gpupn
manual_overrides = ManualOverrides()
if ph is None:
if manual_overrides.refinement.ph is not None:
ph = manual_overrides.refinement.ph
else:
ph = 7.0
if custom_residue_variants is None:
custom_residue_variants = deepcopy(
manual_overrides.refinement.custom_residue_variants_by_targetid
)
if (sim_length / timestep) < nsteps_per_iteration:
nsteps_per_iteration = int(sim_length / timestep)
niterations = int((sim_length / timestep) / nsteps_per_iteration)
models_dir = os.path.abspath(ensembler.core.default_project_dirnames.models)
targets, templates_resolved_seq = ensembler.core.get_targets_and_templates()
if process_only_these_templates:
selected_template_indices = [i for i, seq in enumerate(templates_resolved_seq) if seq.id in process_only_these_templates]
else:
selected_template_indices = range(len(templates_resolved_seq))
if not openmm_platform:
openmm_platform = auto_select_openmm_platform()
if openmm_platform == 'CPU':
platform_properties = {'CpuThreads': str(cpu_platform_threads)}
else:
platform_properties = {}
ff_files = [ff+'.xml', implicit_water_model+'.xml']
forcefield = app.ForceField(*ff_files)
kB = unit.MOLAR_GAS_CONSTANT_R
kT = kB * temperature
def simulate_implicit_md():
logger.debug("Reading model...")
with gzip.open(model_filename) as model_file:
pdb = app.PDBFile(model_file)
# Set up Platform
platform = openmm.Platform.getPlatformByName(openmm_platform)
if 'CUDA_VISIBLE_DEVICES' not in os.environ:
# Set GPU id.
if openmm_platform == 'CUDA':
platform.setPropertyDefaultValue('CudaDeviceIndex', '%d' % gpuid)
elif openmm_platform == 'OpenCL':
platform.setPropertyDefaultValue('OpenCLDeviceIndex', '%d' % gpuid)
# Construct Modeller object with same topology as ref structure
# (necessary to keep disulfide bonds consistent)
modeller = app.Modeller(reference_topology, pdb.positions)
# set_openmm_topology_bonds_from_atom_indices(modeller.topology, reference_bonds)
# Add missing protons.
modeller.addHydrogens(forcefield, pH=ph, variants=reference_variants)
topology = modeller.getTopology()
positions = modeller.getPositions()
logger.debug("Constructing System object...")
if cutoff is None:
system = forcefield.createSystem(topology, nonbondedMethod=app.NoCutoff, constraints=app.HBonds)
else:
system = forcefield.createSystem(topology, nonbondedMethod=app.CutoffNonPeriodic, nonbondedCutoff=cutoff, constraints=app.HBonds)
logger.debug("Creating Context...")
integrator = openmm.LangevinIntegrator(temperature, collision_rate, timestep)
context = openmm.Context(system, integrator, platform, platform_properties)
context.setPositions(positions)
logger.debug("Minimizing structure...")
openmm.LocalEnergyMinimizer.minimize(context, minimization_tolerance, minimization_steps)
if write_trajectory:
# Open trajectory for writing.
logger.debug("Opening trajectory for writing...")
trajectory_filename = os.path.join(model_dir, 'implicit-trajectory.pdb.gz')
trajectory_outfile = gzip.open(trajectory_filename, 'w')
app.PDBFile.writeHeader(topology, file=trajectory_outfile)
# Open energy trajectory for writing
energy_filename = os.path.join(model_dir, 'implicit-energies.txt')
energy_outfile = open(energy_filename, 'w')
energy_outfile.write('# iteration | simulation time (ps) | potential_energy (kT) | kinetic_energy (kT) | ns per day\n')
logger.debug("Running dynamics...")
import time
initial_time = time.time()
for iteration in range(niterations):
# integrate dynamics
integrator.step(nsteps_per_iteration)
# get current state
state = context.getState(getEnergy=True, getPositions=True)
simulation_time = state.getTime()
potential_energy = state.getPotentialEnergy()
kinetic_energy = state.getKineticEnergy()
final_time = time.time()
elapsed_time = (final_time - initial_time) * unit.seconds
ns_per_day = (simulation_time / elapsed_time) / (unit.nanoseconds / unit.day)
logger.debug(
" %8.1f ps : potential %8.3f kT | kinetic %8.3f kT | %.3f ns/day | %.3f s remain"
% (
simulation_time / unit.picoseconds, potential_energy / kT, kinetic_energy / kT,
ns_per_day,
elapsed_time * (niterations-iteration-1) / (iteration+1) / unit.seconds
)
)
# Check energies are still finite.
if np.isnan(potential_energy/kT) or np.isnan(kinetic_energy/kT):
raise Exception("Potential or kinetic energies are nan.")
if write_trajectory:
app.PDBFile.writeModel(topology, state.getPositions(), file=trajectory_outfile, modelIndex=iteration)
# write data
energy_outfile.write(" %8d %8.1f %8.3f %8.3f %.3f\n" % (iteration, simulation_time / unit.picoseconds, potential_energy / kT, kinetic_energy / kT, ns_per_day))
energy_outfile.flush()
if write_trajectory:
app.PDBFile.writeFooter(topology, file=trajectory_outfile)
trajectory_outfile.close()
energy_outfile.close()
# Write final PDB file.
pdb_outfile = gzip.open(pdb_filename, 'wt')
app.PDBFile.writeHeader(topology, file=pdb_outfile)
app.PDBFile.writeFile(topology, state.getPositions(), file=pdb_outfile)
app.PDBFile.writeFooter(topology, file=pdb_outfile)
pdb_outfile.close()
# Process targets
print('Processing targets...') # DEBUG
for target in targets:
if (process_only_these_targets is not None) and (target.id not in process_only_these_targets):
print('Skipping because %s is not in process_only_these_targets' % target.id)
print(process_only_these_targets)
continue
logger.info('Processing %s' % target)
models_target_dir = os.path.join(models_dir, target.id)
if mpistate.rank == 0:
target_starttime = datetime.datetime.utcnow()
if not os.path.exists(models_target_dir):
print('%s does not exist, skipping' % models_target_dir)
continue
mpistate.comm.Barrier()
# ========
# Determine topology (including protonation state) to use throughout
# ========
reference_model_id = get_highest_seqid_existing_model(models_target_dir=models_target_dir)
if reference_model_id is None:
continue
reference_model_path = os.path.join(models_target_dir, reference_model_id, 'model.pdb.gz')
with gzip.open(reference_model_path) as reference_pdb_file:
reference_pdb = app.PDBFile(reference_pdb_file)
logger.debug("Using %s as highest identity model" % (reference_model_id))
if not include_disulfide_bonds:
remove_disulfide_bonds_from_topology(reference_pdb.topology)
# Build topology for reference model
logger.debug("Creating app.Modeller instance...")
modeller = app.Modeller(reference_pdb.topology, reference_pdb.positions)
reference_topology = modeller.topology
logger.debug("Adding hydrogens...")
reference_variants = modeller.addHydrogens(forcefield, pH=ph)
if target.id in custom_residue_variants:
apply_custom_residue_variants(reference_variants, custom_residue_variants[target.id])
logger.debug("Reference variants extracted:")
if reference_variants is not None:
for (residue_index, residue) in enumerate(reference_variants):
if residue is not None:
logger.debug("%8d %s" % (residue_index+1, residue))
logger.debug("")
else:
logger.debug(reference_variants)
if model_seqid_cutoff:
process_only_these_templates = ensembler.core.select_templates_by_seqid_cutoff(target.id, seqid_cutoff=model_seqid_cutoff)
selected_template_indices = [i for i, seq in enumerate(templates_resolved_seq) if seq.id in process_only_these_templates]
ntemplates_selected = len(selected_template_indices)
for template_index in range(mpistate.rank, ntemplates_selected, mpistate.size):
template = templates_resolved_seq[selected_template_indices[template_index]]
model_dir = os.path.join(models_target_dir, template.id)
if not os.path.exists(model_dir): continue
# Only simulate models that are unique following filtering by clustering.
unique_by_clustering = os.path.exists(os.path.join(model_dir, 'unique_by_clustering'))
if not unique_by_clustering: continue
# Pass if this simulation has already been run.
log_filepath = os.path.join(model_dir, 'implicit-log.yaml')
if os.path.exists(log_filepath):
with open(log_filepath) as log_file:
log_data = yaml.load(log_file, Loader=ensembler.core.YamlLoader)
if log_data.get('successful') is True:
continue
if log_data.get('finished') is True and (retry_failed_runs is False and log_data.get('successful') is False):
continue
# Check to make sure the initial model file is present.
model_filename = os.path.join(model_dir, 'model.pdb.gz')
if not os.path.exists(model_filename):
logger.debug('model.pdb.gz not present: target %s template %s rank %d gpuid %d' % (target.id, template.id, mpistate.rank, gpuid))
continue
pdb_filename = os.path.join(model_dir, 'implicit-refined.pdb.gz')
logger.info("-------------------------------------------------------------------------")
logger.info("Simulating %s => %s in implicit solvent for %.1f ps (MPI rank: %d, GPU ID: %d)" % (target.id, template.id, niterations * nsteps_per_iteration * timestep / unit.picoseconds, mpistate.rank, gpuid))
logger.info("-------------------------------------------------------------------------")
# Open log file
log_data = {
'mpi_rank': mpistate.rank,
'gpuid': gpuid if 'CUDA_VISIBLE_DEVICES' not in os.environ else os.environ['CUDA_VISIBLE_DEVICES'],
'openmm_platform': openmm_platform,
'finished': False,
'sim_length': str(sim_length),
'timestep': str(timestep),
'temperature': str(temperature),
'ph': ph,
}
log_file = ensembler.core.LogFile(log_filepath)
log_file.log(new_log_data=log_data)
try:
start = datetime.datetime.utcnow()
simulate_implicit_md()
timing = ensembler.core.strf_timedelta(datetime.datetime.utcnow() - start)
log_data = {
'finished': True,
'timing': timing,
'successful': True,
}
log_file.log(new_log_data=log_data)
except Exception as e:
trbk = traceback.format_exc()
warnings.warn(
'= ERROR start: MPI rank {0} hostname {1} gpuid {2} =\n{3}\n{4}\n= ERROR end: MPI rank {0} hostname {1} gpuid {2}'.format(
mpistate.rank, socket.gethostname(), gpuid, e, trbk
)
)
timing = ensembler.core.strf_timedelta(datetime.datetime.utcnow() - start)
log_data = {
'exception': e,
'traceback': ensembler.core.literal_str(trbk),
'timing': timing,
'finished': True,
'successful': False,
}
log_file.log(new_log_data=log_data)
logger.debug('Finished template loop: rank %d' % mpistate.rank)
mpistate.comm.Barrier()
if mpistate.rank == 0:
project_metadata = ensembler.core.ProjectMetadata(project_stage='refine_implicit_md', target_id=target.id)
datestamp = ensembler.core.get_utcnow_formatted()
command = ['find', models_target_dir, '-name', 'implicit-refined.pdb.gz']
output = subprocess.check_output(command)
nsuccessful_refinements = output.decode('UTF-8').count('\n')
target_timedelta = datetime.datetime.utcnow() - target_starttime
metadata = {
'target_id': target.id,
'datestamp': datestamp,
'timing': ensembler.core.strf_timedelta(target_timedelta),
'openmm_platform': openmm_platform,
'process_only_these_targets': process_only_these_targets,
'process_only_these_templates': process_only_these_templates,
'model_seqid_cutoff': model_seqid_cutoff,
'write_trajectory': write_trajectory,
'include_disulfide_bonds': include_disulfide_bonds,
'custom_residue_variants': custom_residue_variants,
'ff': ff,
'implicit_water_model': implicit_water_model,
'sim_length': str(sim_length),
'timestep': str(timestep),
'temperature': str(temperature),
'collision_rate': str(collision_rate),
'cutoff': str(cutoff),
'nsteps_per_iteration': nsteps_per_iteration,
'ph': ph,
'nsuccessful_refinements': nsuccessful_refinements,
'python_version': sys.version.split('|')[0].strip(),
'python_full_version': ensembler.core.literal_str(sys.version),
'ensembler_version': ensembler.version.short_version,
'ensembler_commit': ensembler.version.git_revision,
'biopython_version': Bio.__version__,
'openmm_version': simtk.openmm.version.short_version,
'openmm_commit': simtk.openmm.version.git_revision,
}
project_metadata.add_data(metadata)
project_metadata.write()
mpistate.comm.Barrier()
mpistate.comm.Barrier()
if mpistate.rank == 0:
logger.info('Done.')
def __init__(self,
targetid,
traj_filepath=None,
topol_filepath=None,
models_data_filepath=None,
process_only_these_templates=None,
loglevel=None,
run_main=True):
"""
Makes trajectory of the model files with added hydrogens, but prior to any refinement.
For the specified target, makes a single topology pdb file, a single trajectory xtc file,
and individual pdb files for each model.
See docs on `MkTraj` for further info on paramters.
Examples
--------
MkTrajImplicitStart(targetid='EGFR_HUMAN_D0')
"""
ensembler.utils.set_loglevel(loglevel)
ensembler.core.check_project_toplevel_dir()
self.models_target_dir = os.path.join(default_project_dirnames.models,
targetid)
logger.debug('Working on target %s' % targetid)
self.ensembler_stage = 'implicit-start'
self.model_filename = 'implicit-start.pdb.gz'
if traj_filepath is None:
self.traj_filepath = os.path.join(
self.models_target_dir,
'traj-{0}.xtc'.format(self.ensembler_stage))
else:
self.traj_filepath = traj_filepath
if topol_filepath is None:
self.topol_filepath = os.path.join(
self.models_target_dir,
'traj-{0}-topol.pdb'.format(self.ensembler_stage))
else:
self.topol_filepath = topol_filepath
if models_data_filepath is None:
self.models_data_filepath = os.path.join(
self.models_target_dir,
'traj-{0}-data.csv'.format(self.ensembler_stage))
else:
self.models_data_filepath = models_data_filepath
if process_only_these_templates:
self.templateids = process_only_these_templates
else:
directories = [
directory for directory in os.walk(self.models_target_dir)
]
self.templateids = directories[0][1]
if run_main:
self._gen_implicit_start_models()
self._gen_df(model_filename=self.model_filename)
self.df.to_csv(self.models_data_filepath,
columns=['templateid', 'seqid'])
self._construct_traj()
self._superpose()
self._write_traj()
def __init__(self,
targetid,
ensembler_stage=None,
traj_filepath=None,
topol_filepath=None,
models_data_filepath=None,
process_only_these_templates=None,
loglevel=None,
run_main=True):
"""Makes a trajectory for a given target, using mdtraj. The trajectory can be used with other
software, e.g. for visualization with PyMOL or VMD.
Parameters
----------
targetid : str
e.g. 'EGFR_HUMAN_D0'
ensembler_stage : str
The Ensembler stage from which to build models, e.g. 'build_models' results in a trajectory
built from the 'model.pdb.gz' files output by the build_models command.
options: build_models|refine_implicit_md|refine_explicit_md
default: most advanced stage for which model files are available
traj_filepath : str
default: models/[targetid]/traj-[ensembler_stage].xtc
topol_filepath : str
default: models/[targetid]/traj-[ensembler_stage]-topol.pdb
models_data_filepath :
default: models/[targetid]/traj-[ensembler_stage]-data.csv
process_only_these_templates : list of str
Returns
-------
traj : mdtraj.Trajectory
df : pandas.DataFrame
models data (e.g. sequence identities):
"""
ensembler.utils.set_loglevel(loglevel)
ensembler.core.check_project_toplevel_dir()
self.models_target_dir = os.path.join(default_project_dirnames.models,
targetid)
logger.debug('Working on target %s' % targetid)
if ensembler_stage is None:
self.ensembler_stage = get_most_advanced_ensembler_modeling_stage(
targetid)
else:
self.ensembler_stage = ensembler_stage
if traj_filepath is None:
self.traj_filepath = os.path.join(
self.models_target_dir,
'traj-{0}.xtc'.format(self.ensembler_stage))
else:
self.traj_filepath = traj_filepath
if topol_filepath is None:
self.topol_filepath = os.path.join(
self.models_target_dir,
'traj-{0}-topol.pdb'.format(self.ensembler_stage))
else:
self.topol_filepath = topol_filepath
if models_data_filepath is None:
self.models_data_filepath = os.path.join(
self.models_target_dir,
'traj-{0}-data.csv'.format(self.ensembler_stage))
else:
self.models_data_filepath = models_data_filepath
if process_only_these_templates:
self.templateids = process_only_these_templates
else:
directories = [
directory for directory in os.walk(self.models_target_dir)
]
self.templateids = directories[0][1]
if run_main:
self._gen_df()
self.df.to_csv(self.models_data_filepath,
columns=['templateid', 'seqid'])
self._construct_traj()
self._superpose()
self._write_traj()
def pdbfix_template(template_full_seq, overwrite_structures=False):
"""
Parameters
----------
template_full_seq: BioPython SeqRecord
full UniProt sequence for span of the template (including unresolved residues)
overwrite_structures: bool
Returns
-------
fixer.missingResidues
"""
try:
template_pdbfixed_filepath = os.path.join(
ensembler.core.default_project_dirnames.
templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixed.pdb')
seq_pdbfixed_filepath = os.path.join(
ensembler.core.default_project_dirnames.
templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixed.fasta')
import pdbfixer
import simtk.openmm.app
template_filepath = os.path.join(
ensembler.core.default_project_dirnames.
templates_structures_resolved, template_full_seq.id + '.pdb')
fixer = pdbfixer.PDBFixer(filename=template_filepath)
chainid = next(fixer.topology.chains()).id
sequence = [
Bio.SeqUtils.seq3(r).upper() for r in template_full_seq.seq
]
seq_obj = pdbfixer.pdbfixer.Sequence(chainid, sequence)
fixer.sequences.append(seq_obj)
fixer.findMissingResidues()
remove_missing_residues_at_termini(fixer,
len_full_seq=len(
template_full_seq.seq))
if not overwrite_structures and os.path.exists(
template_pdbfixed_filepath):
return fixer.missingResidues
fixer.findMissingAtoms()
(newTopology, newPositions, newAtoms,
existingAtomMap) = fixer._addAtomsToTopology(True, True)
fixer.topology = newTopology
fixer.positions = newPositions
with open(template_pdbfixed_filepath, 'w') as template_pdbfixed_file:
simtk.openmm.app.PDBFile.writeFile(fixer.topology,
fixer.positions,
file=template_pdbfixed_file)
# Write sequence to file
seq_pdbfixed = ''.join(
[Bio.SeqUtils.seq1(r.name) for r in fixer.topology.residues()])
seq_record_pdbfixed = SeqRecord(Seq(seq_pdbfixed),
id=template_full_seq.id,
description=template_full_seq.id)
Bio.SeqIO.write([seq_record_pdbfixed], seq_pdbfixed_filepath, 'fasta')
return fixer.missingResidues
except (KeyboardInterrupt, ImportError):
raise
except Exception as e:
trbk = traceback.format_exc()
log_filepath = os.path.abspath(
os.path.join(
ensembler.core.default_project_dirnames.
templates_structures_modeled_loops,
template_full_seq.id + '-pdbfixer-log.yaml'))
logfile = ensembler.core.LogFile(log_filepath)
logfile.log({
'templateid': str(template_full_seq.id),
'exception': e,
'traceback': ensembler.core.literal_str(trbk),
'mpi_rank': mpistate.rank,
})
logger.error(
'MPI rank %d pdbfixer error for template %s - see logfile' %
(mpistate.rank, template_full_seq.id))
logger.debug(e)
logger.debug(trbk)
def package_for_fah(process_only_these_targets=None,
process_only_these_templates=None,
model_seqid_cutoff=None,
model_validation_score_cutoff=None,
model_validation_score_percentile=None,
nclones=1, archive=False,
openmm_platform='Reference',
temperature=300.0 * unit.kelvin,
collision_rate=1.0 / unit.picosecond,
timestep=2.0 * unit.femtoseconds,
loglevel=None):
"""
Create the input files and directory structure necessary to start a Folding@Home project.
MPI-enabled.
Parameters
----------
archive : Bool
A .tgz compressed archive will be created for each individual RUN directory.
"""
set_loglevel(loglevel)
if mpistate.rank == 0:
if not os.path.exists(fah_projects_dir):
os.mkdir(fah_projects_dir)
mpistate.comm.Barrier()
targets, templates_resolved_seq = get_targets_and_templates()
for target in targets:
if process_only_these_targets and (target.id not in process_only_these_targets):
continue
target_project_dir = os.path.join(fah_projects_dir, target.id)
models_target_dir = os.path.join(default_project_dirnames.models, target.id)
if not os.path.exists(models_target_dir):
continue
mpistate.comm.Barrier()
sorted_valid_templates = []
system = None
renumbered_resnums = {}
if mpistate.rank == 0:
logger.info('-------------------------------------------------------------------------')
logger.info('Building FAH OpenMM project for target {}'.format(target.id))
logger.info('-------------------------------------------------------------------------')
valid_templates = get_valid_templates_for_target(
target,
templates_resolved_seq,
process_only_these_templates=process_only_these_templates,
model_seqid_cutoff=model_seqid_cutoff,
model_validation_score_cutoff=model_validation_score_cutoff,
model_validation_score_percentile=model_validation_score_percentile
)
sorted_valid_templates = sort_valid_templates_by_seqid(
target,
valid_templates
)
create_target_project_dir(target)
system = setup_system_and_integrator_files(
target,
sorted_valid_templates[0],
temperature,
collision_rate,
timestep
)
renumbered_resnums = get_renumbered_topol_resnums(target)
sorted_valid_templates = mpistate.comm.bcast(sorted_valid_templates, root=0)
system = mpistate.comm.bcast(system, root=0)
renumbered_resnums = mpistate.comm.bcast(renumbered_resnums, root=0)
logger.debug("Building RUNs in parallel...")
for run_index in range(mpistate.rank, len(sorted_valid_templates), mpistate.size):
template = sorted_valid_templates[run_index]
logger.info('-------------------------------------------------------------------------')
logger.info(
'Building RUN{} for template {}'.format(
run_index, template
)
)
logger.info('-------------------------------------------------------------------------')
source_dir = os.path.join(models_target_dir, template)
generate_fah_run(
target_project_dir,
template,
source_dir,
system,
run_index,
nclones,
temperature,
collision_rate,
timestep,
openmm_platform,
renumbered_resnums,
)
if archive:
tgz_fah_run(target, run_index)
mpistate.comm.Barrier()
if mpistate.rank == 0:
logger.info('Done.')
def generate_fah_run(target_project_dir,
template,
source_dir,
system,
run_index,
nclones,
temperature,
collision_rate,
timestep,
openmm_platform,
renumbered_resnums,
):
"""
Build Folding@Home RUN and CLONE subdirectories from (possibly compressed) OpenMM serialized XML files.
ARGUMENTS
run (int) - run index
"""
logger.debug("Building RUN %d" % run_index)
try:
# Determine directory and pathnames.
run_dir = os.path.join(target_project_dir, 'RUN%d' % run_index)
run_template_id_filepath = os.path.join(run_dir, 'template.txt')
run_seqid_filepath = os.path.join(run_dir, 'sequence-identity.txt')
run_protein_structure_filepath = os.path.join(run_dir, 'protein.pdb')
run_system_structure_filepath = os.path.join(run_dir, 'system.pdb')
run_final_state_filepath = os.path.join(run_dir, 'state%d.xml' % (nclones - 1))
source_seqid_filepath = os.path.join(source_dir, 'sequence-identity.txt')
source_protein_structure_filepath = os.path.join(source_dir, 'implicit-refined.pdb.gz')
source_system_structure_filepath = os.path.join(source_dir, 'explicit-refined.pdb.gz')
source_openmm_state_filepath = os.path.join(source_dir, 'explicit-state.xml')
# Return if this directory has already been set up.
if os.path.exists(run_dir):
if (
os.path.exists(run_template_id_filepath)
and os.path.exists(run_seqid_filepath)
and os.path.exists(run_protein_structure_filepath)
and os.path.exists(run_system_structure_filepath)
and os.path.exists(run_final_state_filepath)
):
return
else:
# Construct run directory if it does not exist.
if not os.path.exists(run_dir):
os.makedirs(run_dir)
# Write template ID
with open(run_template_id_filepath, 'w') as outfile:
outfile.write(template + '\n')
# Write the protein and system structure pdbs
if 'implicit' in renumbered_resnums:
write_renumbered_structure(
source_protein_structure_filepath,
run_protein_structure_filepath,
renumbered_resnums['implicit'],
)
else:
with open(run_protein_structure_filepath, 'w') as protein_structure_file:
protein_structure_file.write(
read_file_contents_gz_or_not(source_protein_structure_filepath)
)
if 'explicit' in renumbered_resnums:
write_renumbered_structure(
source_system_structure_filepath,
run_system_structure_filepath,
renumbered_resnums['explicit'],
)
else:
with open(run_system_structure_filepath, 'w') as system_structure_file:
system_structure_file.write(
read_file_contents_gz_or_not(source_system_structure_filepath)
)
state = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_openmm_state_filepath)
)
# Write sequence identity.
with open(run_seqid_filepath, 'w') as run_seqid_file:
run_seqid_file.write(read_file_contents_gz_or_not(source_seqid_filepath))
# Create new integrator to use.
integrator = mm.LangevinIntegrator(temperature, collision_rate, timestep)
# Create Context so we can randomize velocities.
platform = mm.Platform.getPlatformByName(openmm_platform)
context = mm.Context(system, integrator, platform)
context.setPositions(state.getPositions())
box_vectors = state.getPeriodicBoxVectors()
context.setPeriodicBoxVectors(*box_vectors)
# Create clones with different random initial velocities.
for clone_index in range(nclones):
state_filename = os.path.join(run_dir, 'state%d.xml' % clone_index)
if os.path.exists(state_filename):
continue
context.setVelocitiesToTemperature(temperature)
state = context.getState(
getPositions=True,
getVelocities=True,
getForces=True,
getEnergy=True,
getParameters=True,
enforcePeriodicBox=True
)
with open(state_filename, 'w') as state_file:
state_file.write(mm.XmlSerializer.serialize(state))
except Exception as e:
import traceback
print(traceback.format_exc())
print(str(e))
def cluster_models(process_only_these_targets=None,
cutoff=0.06,
loglevel=None):
"""Cluster models based on RMSD, and filter out non-unique models as
determined by a given cutoff.
Parameters
----------
cutoff : float
Minimum distance cutoff for RMSD clustering (nm)
Runs serially.
"""
# TODO refactor
ensembler.utils.set_loglevel(loglevel)
targets, templates_resolved_seq = get_targets_and_templates()
templates = templates_resolved_seq
for target in targets:
if process_only_these_targets and (target.id
not in process_only_these_targets):
continue
models_target_dir = os.path.join(
ensembler.core.default_project_dirnames.models, target.id)
if not os.path.exists(models_target_dir): continue
# =============================
# Construct a mdtraj trajectory containing all models
# =============================
starttime = datetime.datetime.utcnow()
logger.debug('Building a list of valid models...')
model_pdbfilenames_compressed = {
template.id: os.path.join(models_target_dir, template.id,
'model.pdb.gz')
for template in templates
}
model_pdbfilenames_uncompressed = {
template.id: os.path.join(models_target_dir, template.id,
'model.pdb')
for template in templates
}
valid_templateids = [
templateid for templateid in model_pdbfilenames_compressed
if os.path.exists(model_pdbfilenames_compressed[templateid])
]
# Write uncompressed model.pdb files from model.pdb.gz if necessary
for templateid in valid_templateids:
if not os.path.exists(
model_pdbfilenames_uncompressed[templateid]
) or os.path.getsize(
model_pdbfilenames_uncompressed[templateid]) == 0:
with gzip.open(model_pdbfilenames_compressed[templateid]
) as model_pdbfile_compressed:
with open(model_pdbfilenames_uncompressed[templateid],
'w') as model_pdbfile:
model_pdbfile.write(model_pdbfile_compressed.read())
logger.info('Constructing a trajectory containing all valid models...')
if len(valid_templateids) == 0:
logger.info('No models found for target {0}.'.format(target.id))
continue
valid_model_pdbfilenames_uncompressed = [
model_pdbfilenames_uncompressed[templateid]
for templateid in valid_templateids
]
traj = mdtraj.load(valid_model_pdbfilenames_uncompressed)
# =============================
# Clustering
# =============================
logger.info('Conducting RMSD-based clustering...')
# Remove any existing unique_by_clustering files
for f in glob.glob(models_target_dir + '/*_PK_*/unique_by_clustering'):
os.unlink(f)
CAatoms = [a.index for a in traj.topology.atoms if a.name == 'CA']
unique_templateids = models_regular_spatial_clustering(
valid_templateids, traj, atom_indices=CAatoms, cutoff=cutoff)
write_unique_by_clustering_files(unique_templateids, models_target_dir)
with open(os.path.join(models_target_dir, 'unique-models.txt'),
'w') as uniques_file:
for u in unique_templateids:
uniques_file.write(u + '\n')
logger.info(
'%d unique models (from original set of %d) using cutoff of %.3f nm'
% (len(unique_templateids), len(valid_templateids), cutoff))
for template in templates:
model_dir = os.path.join(models_target_dir, template.id)
model_pdbfilename = os.path.join(model_dir, 'model.pdb')
if os.path.exists(model_pdbfilename):
os.remove(model_pdbfilename)
# ========
# Metadata
# ========
project_metadata = ensembler.core.ProjectMetadata(
project_stage='cluster_models', target_id=target.id)
datestamp = ensembler.core.get_utcnow_formatted()
timedelta = datetime.datetime.utcnow() - starttime
metadata = {
'target_id': target.id,
'datestamp': datestamp,
'nunique_models': len(unique_templateids),
'python_version': sys.version.split('|')[0].strip(),
'python_full_version': ensembler.core.literal_str(sys.version),
'ensembler_version': ensembler.version.short_version,
'ensembler_commit': ensembler.version.git_revision,
'biopython_version': Bio.__version__,
'mdtraj_version': mdtraj.version.short_version,
'mdtraj_commit': mdtraj.version.git_revision,
'timing': ensembler.core.strf_timedelta(timedelta),
}
project_metadata.add_data(metadata)
project_metadata.write()
def _gen_implicit_start_models(
self,
ff='amber99sbildn.xml', implicit_water_model='amber99_obc.xml',
ph=8.0):
self.ph = ph
from simtk.openmm import app
valid_model_templateids = [
templateid for templateid in self.templateids
if os.path.exists(
os.path.join(
self.models_target_dir, templateid,
ensembler.core.model_filenames_by_ensembler_stage['refine_implicit_md']
)
)
]
gen_model_templateids = [
templateid for templateid in valid_model_templateids
if not os.path.exists(
os.path.join(self.models_target_dir, templateid, self.model_filename)
)
]
# make reference model
forcefield = app.ForceField(ff, implicit_water_model)
reference_model_id = get_highest_seqid_existing_model(models_target_dir=self.models_target_dir)
logger.debug('Using {0} as reference model'.format(reference_model_id))
reference_model_path = os.path.join(self.models_target_dir, reference_model_id, model_filenames_by_ensembler_stage['build_models'])
with gzip.open(reference_model_path) as reference_pdb_file:
reference_pdb = app.PDBFile(reference_pdb_file)
remove_disulfide_bonds_from_topology(reference_pdb.topology)
reference_topology = reference_pdb.topology
reference_modeller = app.Modeller(reference_pdb.topology, reference_pdb.positions)
reference_variants = reference_modeller.addHydrogens(forcefield, pH=self.ph)
for template_index in range(mpistate.rank, len(gen_model_templateids), mpistate.size):
templateid = gen_model_templateids[template_index]
logger.debug('Generating implicit-start model for {0}'.format(templateid))
try:
input_model_filepath = os.path.join(self.models_target_dir, templateid, model_filenames_by_ensembler_stage['build_models'])
output_model_filepath = os.path.join(self.models_target_dir, templateid, self.model_filename)
with gzip.open(input_model_filepath) as pdb_file:
pdb = app.PDBFile(pdb_file)
remove_disulfide_bonds_from_topology(pdb.topology)
modeller = app.Modeller(reference_topology, pdb.positions)
modeller.addHydrogens(forcefield, pH=self.ph, variants=reference_variants)
topology = modeller.getTopology()
positions = modeller.getPositions()
with gzip.open(output_model_filepath, 'wt') as output_model_file:
app.PDBFile.writeHeader(topology, file=output_model_file)
app.PDBFile.writeFile(topology, positions, file=output_model_file)
app.PDBFile.writeFooter(topology, file=output_model_file)
except Exception as e:
print('Error for model {0}: {1}'.format(templateid, e))
continue
def simulate_implicit_md():
logger.debug("Reading model...")
with gzip.open(model_filename) as model_file:
pdb = app.PDBFile(model_file)
# Set up Platform
platform = openmm.Platform.getPlatformByName(openmm_platform)
if 'CUDA_VISIBLE_DEVICES' not in os.environ:
# Set GPU id.
if openmm_platform == 'CUDA':
platform.setPropertyDefaultValue('CudaDeviceIndex', '%d' % gpuid)
elif openmm_platform == 'OpenCL':
platform.setPropertyDefaultValue('OpenCLDeviceIndex', '%d' % gpuid)
# Construct Modeller object with same topology as ref structure
# (necessary to keep disulfide bonds consistent)
modeller = app.Modeller(reference_topology, pdb.positions)
# set_openmm_topology_bonds_from_atom_indices(modeller.topology, reference_bonds)
# Add missing protons.
modeller.addHydrogens(forcefield, pH=ph, variants=reference_variants)
topology = modeller.getTopology()
positions = modeller.getPositions()
logger.debug("Constructing System object...")
if cutoff is None:
system = forcefield.createSystem(topology, nonbondedMethod=app.NoCutoff, constraints=app.HBonds)
else:
system = forcefield.createSystem(topology, nonbondedMethod=app.CutoffNonPeriodic, nonbondedCutoff=cutoff, constraints=app.HBonds)
logger.debug("Creating Context...")
integrator = openmm.LangevinIntegrator(temperature, collision_rate, timestep)
context = openmm.Context(system, integrator, platform, platform_properties)
context.setPositions(positions)
logger.debug("Minimizing structure...")
openmm.LocalEnergyMinimizer.minimize(context, minimization_tolerance, minimization_steps)
if write_trajectory:
# Open trajectory for writing.
logger.debug("Opening trajectory for writing...")
trajectory_filename = os.path.join(model_dir, 'implicit-trajectory.pdb.gz')
trajectory_outfile = gzip.open(trajectory_filename, 'w')
app.PDBFile.writeHeader(topology, file=trajectory_outfile)
# Open energy trajectory for writing
energy_filename = os.path.join(model_dir, 'implicit-energies.txt')
energy_outfile = open(energy_filename, 'w')
energy_outfile.write('# iteration | simulation time (ps) | potential_energy (kT) | kinetic_energy (kT) | ns per day\n')
logger.debug("Running dynamics...")
import time
initial_time = time.time()
for iteration in range(niterations):
# integrate dynamics
integrator.step(nsteps_per_iteration)
# get current state
state = context.getState(getEnergy=True, getPositions=True)
simulation_time = state.getTime()
potential_energy = state.getPotentialEnergy()
kinetic_energy = state.getKineticEnergy()
final_time = time.time()
elapsed_time = (final_time - initial_time) * unit.seconds
ns_per_day = (simulation_time / elapsed_time) / (unit.nanoseconds / unit.day)
logger.debug(
" %8.1f ps : potential %8.3f kT | kinetic %8.3f kT | %.3f ns/day | %.3f s remain"
% (
simulation_time / unit.picoseconds, potential_energy / kT, kinetic_energy / kT,
ns_per_day,
elapsed_time * (niterations-iteration-1) / (iteration+1) / unit.seconds
)
)
# Check energies are still finite.
if np.isnan(potential_energy/kT) or np.isnan(kinetic_energy/kT):
raise Exception("Potential or kinetic energies are nan.")
if write_trajectory:
app.PDBFile.writeModel(topology, state.getPositions(), file=trajectory_outfile, modelIndex=iteration)
# write data
energy_outfile.write(" %8d %8.1f %8.3f %8.3f %.3f\n" % (iteration, simulation_time / unit.picoseconds, potential_energy / kT, kinetic_energy / kT, ns_per_day))
energy_outfile.flush()
if write_trajectory:
app.PDBFile.writeFooter(topology, file=trajectory_outfile)
trajectory_outfile.close()
energy_outfile.close()
# Write final PDB file.
pdb_outfile = gzip.open(pdb_filename, 'wt')
app.PDBFile.writeHeader(topology, file=pdb_outfile)
app.PDBFile.writeFile(topology, state.getPositions(), file=pdb_outfile)
app.PDBFile.writeFooter(topology, file=pdb_outfile)
pdb_outfile.close()
def generate_fah_run(
target_project_dir,
template,
source_dir,
system,
run_index,
nclones,
temperature,
collision_rate,
timestep,
openmm_platform,
renumbered_resnums,
):
"""
Build Folding@Home RUN and CLONE subdirectories from (possibly compressed) OpenMM serialized XML files.
ARGUMENTS
run (int) - run index
"""
logger.debug("Building RUN %d" % run_index)
try:
# Determine directory and pathnames.
run_dir = os.path.join(target_project_dir, 'RUN%d' % run_index)
run_template_id_filepath = os.path.join(run_dir, 'template.txt')
run_seqid_filepath = os.path.join(run_dir, 'sequence-identity.txt')
run_protein_structure_filepath = os.path.join(run_dir, 'protein.pdb')
run_system_structure_filepath = os.path.join(run_dir, 'system.pdb')
run_final_state_filepath = os.path.join(run_dir,
'state%d.xml' % (nclones - 1))
source_seqid_filepath = os.path.join(source_dir,
'sequence-identity.txt')
source_protein_structure_filepath = os.path.join(
source_dir, 'implicit-refined.pdb.gz')
source_system_structure_filepath = os.path.join(
source_dir, 'explicit-refined.pdb.gz')
source_openmm_state_filepath = os.path.join(source_dir,
'explicit-state.xml')
# Return if this directory has already been set up.
if os.path.exists(run_dir):
if (os.path.exists(run_template_id_filepath)
and os.path.exists(run_seqid_filepath)
and os.path.exists(run_protein_structure_filepath)
and os.path.exists(run_system_structure_filepath)
and os.path.exists(run_final_state_filepath)):
return
else:
# Construct run directory if it does not exist.
if not os.path.exists(run_dir):
os.makedirs(run_dir)
# Write template ID
with open(run_template_id_filepath, 'w') as outfile:
outfile.write(template + '\n')
# Write the protein and system structure pdbs
if 'implicit' in renumbered_resnums:
write_renumbered_structure(
source_protein_structure_filepath,
run_protein_structure_filepath,
renumbered_resnums['implicit'],
)
else:
with open(run_protein_structure_filepath,
'w') as protein_structure_file:
protein_structure_file.write(
read_file_contents_gz_or_not(
source_protein_structure_filepath))
if 'explicit' in renumbered_resnums:
write_renumbered_structure(
source_system_structure_filepath,
run_system_structure_filepath,
renumbered_resnums['explicit'],
)
else:
with open(run_system_structure_filepath,
'w') as system_structure_file:
system_structure_file.write(
read_file_contents_gz_or_not(
source_system_structure_filepath))
state = mm.XmlSerializer.deserialize(
read_file_contents_gz_or_not(source_openmm_state_filepath))
# Write sequence identity.
with open(run_seqid_filepath, 'w') as run_seqid_file:
run_seqid_file.write(
read_file_contents_gz_or_not(source_seqid_filepath))
# Create new integrator to use.
integrator = mm.LangevinIntegrator(temperature, collision_rate,
timestep)
# Create Context so we can randomize velocities.
platform = mm.Platform.getPlatformByName(openmm_platform)
context = mm.Context(system, integrator, platform)
context.setPositions(state.getPositions())
box_vectors = state.getPeriodicBoxVectors()
context.setPeriodicBoxVectors(*box_vectors)
# Create clones with different random initial velocities.
for clone_index in range(nclones):
state_filename = os.path.join(run_dir, 'state%d.xml' % clone_index)
if os.path.exists(state_filename):
continue
context.setVelocitiesToTemperature(temperature)
state = context.getState(getPositions=True,
getVelocities=True,
getForces=True,
getEnergy=True,
getParameters=True,
enforcePeriodicBox=True)
with open(state_filename, 'w') as state_file:
state_file.write(mm.XmlSerializer.serialize(state))
except Exception as e:
import traceback
print(traceback.format_exc())
print(str(e))
def __init__(self, targetid, ensembler_stage=None, traj_filepath=None, topol_filepath=None,
models_data_filepath=None, process_only_these_templates=None, loglevel=None,
run_main=True):
"""Makes a trajectory for a given target, using mdtraj. The trajectory can be used with other
software, e.g. for visualization with PyMOL or VMD.
Parameters
----------
targetid : str
e.g. 'EGFR_HUMAN_D0'
ensembler_stage : str
The Ensembler stage from which to build models, e.g. 'build_models' results in a trajectory
built from the 'model.pdb.gz' files output by the build_models command.
options: build_models|refine_implicit_md|refine_explicit_md
default: most advanced stage for which model files are available
traj_filepath : str
default: models/[targetid]/traj-[ensembler_stage].xtc
topol_filepath : str
default: models/[targetid]/traj-[ensembler_stage]-topol.pdb
models_data_filepath :
default: models/[targetid]/traj-[ensembler_stage]-data.csv
process_only_these_templates : list of str
Returns
-------
traj : mdtraj.Trajectory
df : pandas.DataFrame
models data (e.g. sequence identities):
"""
ensembler.utils.set_loglevel(loglevel)
ensembler.core.check_project_toplevel_dir()
self.models_target_dir = os.path.join(default_project_dirnames.models, targetid)
logger.debug('Working on target %s' % targetid)
if ensembler_stage is None:
self.ensembler_stage = get_most_advanced_ensembler_modeling_stage(targetid)
else:
self.ensembler_stage = ensembler_stage
if traj_filepath is None:
self.traj_filepath = os.path.join(
self.models_target_dir, 'traj-{0}.xtc'.format(self.ensembler_stage)
)
else:
self.traj_filepath = traj_filepath
if topol_filepath is None:
self.topol_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-topol.pdb'.format(self.ensembler_stage)
)
else:
self.topol_filepath = topol_filepath
if models_data_filepath is None:
self.models_data_filepath = os.path.join(
self.models_target_dir, 'traj-{0}-data.csv'.format(self.ensembler_stage)
)
else:
self.models_data_filepath = models_data_filepath
if process_only_these_templates:
self.templateids = process_only_these_templates
else:
directories = [ directory for directory in os.walk(self.models_target_dir) ]
self.templateids = directories[0][1]
if run_main:
self._gen_df()
self.df.to_csv(self.models_data_filepath, columns=['templateid', 'seqid'])
self._construct_traj()
self._superpose()
self._write_traj()