def certify_pdb_pdb(pdbfile1, pdbfile2):
fileexist = 0
value = 0
try:
fileexist1 = os.path.isfile(pdbfile1)
fileexist2 = os.path.isfile(pdbfile2)
if (fileexist1 and fileexist2):
fileexist = 1
pdbmol1 = sasmol.SasMol(0)
pdbmol2 = sasmol.SasMol(1)
try:
pdbmol1.read_pdb(pdbfile1, fastread=True)
pdbmol2.read_pdb(pdbfile2, fastread=True)
name1 = pdbmol1.name()
name2 = pdbmol2.name()
if (name1 == name2):
value = 1
except:
value = 0
else:
return fileexist, value
except:
value = 0
return fileexist, value
def replace_N_atoms():
'''
swap N9-N1 atoms in rename DNA residues
GUA or ADE N1 -> N9
CYT or THY N1 -> N9
'''
dna1_file = '../dna1_right_seq.pdb'
dna1_out = '../dna1_right.pdb'
dna1 = sasmol.SasMol(0)
dna1.read_pdb(dna1_file)
dna2_file = '../dna2_right_seq.pdb'
dna2_out = '../dna2_right.pdb'
dna2 = sasmol.SasMol(0)
dna2.read_pdb(dna2_file)
'''
Count the number of resids for each resid
Loop over each resid with <13 atoms
. Use enumerate to get the indices for the atoms the residue
. Iterate over those indices to find the N1 or N9 atom
. Depending on which base type it is, replace the atom name
Store the names in the Sasmol object
Save the pdb
Loop over every atom,
add 1 to the number of some in that residue (can use count instead)
Store the index for the n9 and n1 atoms
Then loop over just the group s to for n atoms
'''
replace_n1_n9(dna1, dna1_out)
replace_n1_n9(dna2, dna2_out)
return
def certify_pdb_dcd(pdbfile, dcdfile):
'''
This method checks that the number of atoms in the pdb file
is equal to the number of atoms in the dcd file.
The method assumes that the pdb and dcd files exist and are
readable.
'''
value = 0
try:
pdbmol = sasmol.SasMol(0)
dcdmol = sasmol.SasMol(1)
pdbmol.read_pdb(pdbfile, fastread=True)
natoms_pdb = pdbmol.natoms()
dcdfile = dcdmol.open_dcd_read(dcdfile)
natoms_dcd = dcdfile[1]
if (natoms_pdb == natoms_dcd):
value = 1
except:
value = 0
return value
def split_dcd(inputs):
import sassie.sasmol.sasmol as sasmol
import numpy as np
inputs.out_dir = inputs.runname + '/crysol'
if os.path.exists(inputs.out_dir):
print 'WARNING: run folder exists (%s), moving it\n' % inputs.out_dir
append_bk(inputs.out_dir)
# print 'select one of the following (0/1/2): quit / move / replace'
# folder = folder_exists()
# folder.runname = inputs.out_dir
# result = folder.cmdloop()
else:
print 'created new run folder: %s' % inputs.out_dir
mkdir_p(inputs.out_dir)
mol = sasmol.SasMol(0)
mol.read_pdb(inputs.pdb)
# mol.read_dcd(inputs.dcd)
dcd_file = mol.open_dcd_read(inputs.dcd)
total_frames = dcd_file[2]
n_atoms = dcd_file[1]
copy_mask = np.ones(n_atoms, dtype=np.int32)
if inputs.ncpu < 0:
print 'ncpu: %d < 0, using |%d| = %d instead' % (
inputs.ncpu, inputs.ncpu, abs(inputs.ncpu))
inputs.ncpu = abs(inputs.ncpu)
n_frames_sub = total_frames / inputs.ncpu
last_frame = 0
sub_dirs = []
dcd_file_names = []
for cpu in xrange(1, inputs.ncpu + 1):
sub_dir = inputs.out_dir + '/sub' + str(cpu).zfill(2) + '/'
sub_dirs.append(sub_dir)
mkdir_p(sub_dir)
os.system('cp %s %s' % (inputs.pdb, sub_dir))
sub_mol = sasmol.SasMol(0)
mol.copy_molecule_using_mask(sub_mol, copy_mask, 0)
with cd(sub_dir):
if cpu == inputs.ncpu:
n_frames_sub = n_frames_sub + total_frames % inputs.ncpu
dcd_out_name = 'sub' + str(cpu).zfill(2) + '.dcd'
dcd_file_names.append(dcd_out_name)
first = last_frame
last = last_frame + n_frames_sub
dcd_out_file = sub_mol.open_dcd_write(dcd_out_name)
for (i, frame) in enumerate(xrange(first, last)):
sub_mol.read_dcd_step(dcd_file, frame)
sub_mol.write_dcd_step(dcd_out_file, 0, i + 1)
sub_mol.close_dcd_write(dcd_out_file)
del sub_mol
last_frame += n_frames_sub
print
return sub_dirs, dcd_file_names
def get_pdb_complex_stats(filename, segname, variables):
value = 0
try:
o = sasmol.SasMol(0)
o.read_pdb(filename, fastread=True)
seg_filter = 'segname[i] == "' + segname.strip() + '"'
error, seg_mask = o.get_subset_mask(seg_filter)
a = sasmol.SasMol(1)
error = o.copy_molecule_using_mask(a, seg_mask, 0)
result = []
try:
for i in xrange(len(variables)):
if (variables[i] == 'atom'):
result.append(a.atom())
elif (variables[i] == 'index'):
result.append(a.index())
elif (variables[i] == 'name'):
result.append(a.name())
elif (variables[i] == 'loc'):
result.append(a.loc())
elif (variables[i] == 'resname'):
result.append(a.resname())
elif (variables[i] == 'chain'):
result.append(a.chain())
elif (variables[i] == 'resid'):
result.append(a.resid())
elif (variables[i] == 'rescode'):
result.append(a.rescode())
elif (variables[i] == 'x'):
result.append(coor[0, :, 0]())
elif (variables[i] == 'y'):
result.append(coor[0, :, 1]())
elif (variables[i] == 'z'):
result.append(coor[0, :, 2]())
elif (variables[i] == 'occupancy'):
result.append(a.occupancy())
elif (variables[i] == 'beta'):
result.append(a.beta())
elif (variables[i] == 'segname'):
result.append(a.segname())
elif (variables[i] == 'element'):
result.append(a.element())
elif (variables[i] == 'charge'):
result.append(a.charge())
elif (variables[i] == 'moltype'):
result.append(a.moltype())
value = 1
except:
value = 0
result = None
except:
value = 0
result = None
return value, result
def align_mol(inputs):
'''
input:
------
intputs: object that should contain the following attributes
aa_goal: goal sasmol object
aa_move: sasmol object to align
goal_basis: goal basis for alignment
move_basis: move basis for alignment
returns:
--------
out: aligned sasmol object
note: inputs.ref and inputs.move are typically the same pdb/dcd
'''
aa_goal = inputs.aa_goal
aa_move = inputs.aa_move
goal_basis = inputs.goal_basis
move_basis = inputs.move_basis
# create the SasMol objects
sub_goal = sasmol.SasMol(0)
sub_move = sasmol.SasMol(0)
error, goal_seg_mask = aa_goal.get_subset_mask(goal_basis)
error, move_seg_mask = aa_move.get_subset_mask(move_basis)
error = aa_goal.copy_molecule_using_mask(sub_goal, goal_seg_mask, 0)
error = aa_move.copy_molecule_using_mask(sub_move, move_seg_mask, 0)
# calculate the center of mass of the subset of m1
com_sub_goal = sub_goal.calccom(0)
sub_goal.center(0) # center the m1 coordinates
# get the m1 centered coordinates
coor_sub_goal = sub_goal.coor()[0]
aa_move.center(0) # move m2 to be centered at the origin
error, sub_move.coor = aa_move.get_coor_using_mask(0, move_seg_mask)
sub_move.setCoor(sub_move.coor)
# calculate the center of mass of the subset of m2
com_sub_move = sub_move.calccom(0)
# move the subset of m2 to be centered at the origin
sub_move.center(0)
# get the new coordinates of the subset of m2
coor_sub_move = sub_move.coor[0]
# align m2 using the transformation from sub_m2 to sub_m1
aa_move.align(0, coor_sub_move, com_sub_move, coor_sub_goal, com_sub_goal)
def certify_dcd_psf(dcdfile, psffile):
'''
This method checks that the number of atoms in the psf file
is equal to the number of atoms in the dcd file.
The method assumes that the psf and dcd files exist and are
readable.
'''
fileexist = 0
value = 0
try:
fileexist = os.path.isfile(psffile)
if (fileexist):
fileexist = 1
try:
natoms_psf, names_psf = read_psf_file(psffile)
dcdmol = sasmol.SasMol(1)
dcdfile = dcdmol.open_dcd_read(dcdfile)
natoms_dcd = dcdfile[1]
if (natoms_psf == natoms_dcd):
value = 1
except:
value = 0
else:
return fileexist, value
except:
value = 0
return fileexist, value
def make_complex_groups(hybrid, residues_in_groups, segnames_in_groups):
assert len(residues_in_groups) == len(segnames_in_groups), (
'inputs do not match')
frame = 0
resid = hybrid.resid()
group_masks = []
groups = []
for (i, res_group) in enumerate(residues_in_groups):
basis = '( '
for (j, resids) in enumerate(res_group):
if j > 0:
basis += ' or '
for (k, resid) in enumerate(resids):
if k == 0:
basis += '((segname[i] == "' + segnames_in_groups[i][j] + \
'") and (resid[i] == ' + str(resid)
else:
basis += ' or resid[i] == ' + str(resid)
basis += ')) '
basis += ')'
print '>> creating basis = ', basis
error, mask = hybrid.get_subset_mask(basis)
group_masks.append(mask)
this_group = sasmol.SasMol(0)
error = hybrid.copy_molecule_using_mask(this_group, mask, frame)
groups.append(this_group)
return groups, group_masks
def certify_pdb_psf(pdbfile, psffile):
fileexist = 0
value = 0
try:
fileexist = os.path.isfile(psffile)
if (fileexist):
fileexist = 1
try:
natoms_psf, names_psf = read_psf_file(psffile)
pdbmol = sasmol.SasMol(1)
pdbmol.read_pdb(pdbfile, fastread=True)
natoms_pdb = pdbmol.natoms()
names_pdb = pdbmol.name()
# if((natoms_pdb == natoms_psf) and (names_pdb == names_psf)):
if ((natoms_pdb == natoms_psf)):
value = 1
except:
value = 0
else:
return fileexist, value
except:
value = 0
return fileexist, value
def makeLongDNA(n_lp):
print 'making DNA that is %d*lp long' % n_lp
# 15 bp/bead or 51 A/bead (3.4 A/bp)
lp = 530 # persistence length in A
l = 2**(1. / 6.) * 46 # separation distance between beads = 51.6A
longDNA = sasmol.SasMol(0)
L = n_lp * lp
N = int(L / l)
natoms = N + 1
print 'natoms = ', natoms
longDNA._L = L
longDNA._natoms = natoms
# initialize the long DNA coordinates
longCoor = np.zeros((1, natoms, 3), np.float)
# set the z-values to the index of the array
longCoor[0][:, 2] = range(natoms)
# scale the z-values to the right seperation
longCoor *= l
# print longCoor[-5:]
longDNA.setCoor(longCoor)
longDNA.setElement(['C'] * natoms)
vecXYZ = np.zeros((natoms * 3, 3))
vecXYZ[0:natoms] = [1, 0, 0]
vecXYZ[natoms:2 * natoms] = [0, 1, 0]
vecXYZ[2 * natoms:3 * natoms] = [0, 0, 1]
# n = L/l # number of times need to repeat the grain
# print '(l, L, n)', (l, L, n)
return (longDNA, vecXYZ)
def get_coords_from_argon(argon_file_name):
argon = sasmol.SasMol(0)
argon.read_pdb(argon_file_name)
com_coor = argon.coor()[0]
return com_coor
def pdb_get_sequence(pdbobj=None, outfile=None):
''' get the sequence of a sasmol object '''
if isinstance(pdbobj, basestring):
pdbfile = pdbobj
pdbobj = sasmol.SasMol(0)
pdbobj.read_pdb(pdbfile)
resname2seq = {
'ALA': 'A', # amino acids
'ARG': 'R',
'ASN': 'N',
'ASP': 'D',
'CYS': 'C',
'GLU': 'E',
'GLN': 'Q',
'GLY': 'G',
'HIS': 'H',
'ILE': 'I',
'LEU': 'L',
'LYS': 'K',
'MET': 'M',
'PHE': 'F',
'PRO': 'P',
'SER': 'S',
'THR': 'T',
'TRP': 'W',
'TYR': 'Y',
'VAL': 'V',
'HSE': 'H',
'G': 'G', # DNA
'A': 'A',
'T': 'T',
'C': 'C',
'DG': 'G',
'DA': 'A',
'DT': 'T',
'DC': 'C',
'GUA': 'G',
'ADE': 'A',
'THY': 'T',
'CYT': 'C'
}
resid_all = pdbobj.resid()
idx_unique = np.nonzero(np.insert(resid_all[1:] - resid_all[0:-1], 0, 1))
idx_unique = idx_unique[0] # it appears to be a tuple
resname_all = pdbobj.resname()
sequence = map(lambda i: resname2seq[resname_all[i]], idx_unique)
if outfile == None:
print "Sequence: total {} residues".format(len(sequence))
print "".join(sequence)
else:
with open(outfile, 'w') as fileobj:
fileobj.write("".join(sequence))
return sequence
def split_dcd(pdb_full_name, dcd_full_name, n_cpus, starting_dir):
mol = sasmol.SasMol(0)
mol.read_pdb(pdb_full_name)
dcd_file = mol.open_dcd_read(dcd_full_name)
total_frames = dcd_file[2]
n_atoms = dcd_file[1]
# copy_mask = np.ones(n_atoms, dtype=np.int32)
_, copy_mask = mol.get_subset_mask('all')
n_frames_sub = total_frames / n_cpus
last_frame = 0
sub_dirs = []
sub_dcd_names = []
first_last = []
for cpu in xrange(1, n_cpus + 1):
sub_dir = op.join(starting_dir, 'sub%s' % str(cpu).zfill(2))
sub_dirs.append(sub_dir)
mkdir_p(sub_dir)
sub_mol = sasmol.SasMol(0)
mol.copy_molecule_using_mask(sub_mol, copy_mask, 0)
with cd(sub_dir):
if cpu == n_cpus:
n_frames_sub = n_frames_sub + total_frames % n_cpus
dcd_out_name = 'sub%s.dcd' % str(cpu).zfill(2)
sub_dcd_names.append(dcd_out_name)
first = last_frame
last = last_frame + n_frames_sub
if n_cpus == 1:
rel_dcd_name = '../../../%s' % dcd_full_name
assert op.exists(rel_dcd_name), 'ERROR: did not find dcd file'
subprocess.call(['ln', '-s', rel_dcd_name, dcd_out_name])
else:
dcd_out_file = sub_mol.open_dcd_write(dcd_out_name)
for (i, frame) in enumerate(xrange(first, last)):
sub_mol.read_dcd_step(dcd_file, frame)
sub_mol.write_dcd_step(dcd_out_file, 0, i + 1)
sub_mol.close_dcd_write(dcd_out_file)
first_last.append([first, last])
last_frame += n_frames_sub
mol.close_dcd_read(dcd_file[0])
return sub_dirs, sub_dcd_names, first_last
def pdb_get_chains(pdbobj=None,
outfile='seg_',
segnames=None,
chainids=None,
get_seq=True):
''' get the sequence of a sasmol object '''
# filename is passed, read it
if isinstance(pdbobj, basestring):
pdbfile = pdbobj
pdbobj = sasmol.SasMol(0)
pdbobj.read_pdb(pdbfile)
# set the filter prefix (chainid has priority)
if segnames != None:
filter_name = segnames
filter_tmpl = "(segname[i] == '{}')"
if chainids != None:
filter_name = chainids
filter_tmpl = "(chain[i] == '{}')"
# a single string is passed, convert it to a list
if isinstance(filter_name, basestring):
filter_name = [filter_name]
seg_mols = []
for eachfilter in filter_name:
print "Filter pdb by: ", filter_tmpl.format(eachfilter)
error, mask = pdbobj.get_subset_mask(filter_tmpl.format(eachfilter))
if error:
print error
eachfilter_mol = sasmol.SasMol(0)
error = pdbobj.copy_molecule_using_mask(eachfilter_mol, mask, 0)
if error:
print error
# eachfilter_mol.setSegname(eachfilter)
eachfilter_mol.write_pdb(outfile + '.pdb', 0, 'w')
seg_mols.append(eachfilter_mol)
if get_seq:
pdb_get_sequence.pdb_get_sequence(eachfilter_mol)
print 'COMPLETE'
return seg_mols
def main():
m1 = sasmol.SasMol(0)
m1.read_pdb(ARGS.pdb)
print ARGS.segnames
segname1 = ARGS.segnames[0]
segname2 = ARGS.segnames[1]
print 'segname 1: ', segname1
print 'segname 2: ', segname2
names = m1.resname()
ids = m1.resid()
c = m1.segname()
psfgenFile = ARGS.pdb[:-4] + '_patches.txt'
outfile = open(psfgenFile, 'w') # open the file
timestr = time.strftime("# created on %d %B %Y by 'pdb2psfgen.py'\n")
outfile.write(timestr)
outfile.write('# dna1: segname ' + segname1 + '\n')
outfile.write('# dna2: segname ' + segname2 + '\n')
pyr = ['C', 'T', 'DC', 'DT', 'CYT', 'THY']
pur = ['A', 'G', 'DA', 'DG', 'ADE', 'GUA']
pyrStr = 'patch DEO1 '
purStr = 'patch DEO2 '
n = 0
for (j, i) in enumerate(ids):
# only want this to happend once for each residue
if n != i:
n = i
# print 'adding line %d' % i
if c[j] in segname1:
dna = 'dna1:%d\n' % i
elif c[j] in segname2:
dna = 'dna2:%d\n' % i
else:
print 'Skipping residue from unspecified segname: ', c[j]
break
# s dna = 'protein:%d\n' % i
if names[j] in pyr:
outfile.write(pyrStr + dna)
# print pyrStr + dna
elif names[j] in pur:
outfile.write(purStr + dna)
# print purStr + dna
else:
print 'ERROR!!! unknown resname in specified segname: ', names[j]
print '\n'
outfile.close()
print 'COMPLETE \m/ >.< \m/'
def get_linker_assign_coor(three_ball, ball_diameter, minimum_base_angle,
surface1_to_anchor_cord_length, linker_pdb):
frame = 0
linker = sasmol.SasMol(0)
linker.read_pdb(linker_pdb)
# move linker com to origin
linker.moveto(frame, [0.0, 0.0, 0.0])
last_c = linker.coor()[0][-1]
# move linker last_c to origin
# not debugged for all directions of linker ...
linker.translate(frame, -last_c)
first_n = linker.coor()[0][0]
last_c = linker.coor()[0][-1]
linker_length = numpy.sqrt(numpy.sum((first_n - last_c)**2.0))
# define end-point vector b
b = first_n - last_c
# define axis to rotate to (z-axis here)
a = numpy.zeros(3, numpy.float)
a[2] = 1.0
# align coordinates onto axis (z-axis from "a" above)
R = get_alignment_rotation_matrix(b, a)
rotate_coordinates(b, R, linker)
# move linker so that c-terminal is at origin
linker.translate(frame, -linker.coor()[0][-1])
# move linker to anchor point
linker.moveto(frame, [
0.0, 0.0, (ball_diameter / 2.0) + surface1_to_anchor_cord_length +
(linker_length / 2.0)
])
linker.write_pdb('new_single_linker.pdb', frame, 'w')
# build hybrid molecule
hybrid = build_hybrid(linker, three_ball, minimum_base_angle)
return hybrid
def get_pdb_stats(filename, variables):
value = 0
try:
a = sasmol.SasMol(0)
a.read_pdb(filename, fastread=True)
result = []
try:
for i in xrange(len(variables)):
if (variables[i] == 'atom'):
result.append(a.atom())
elif (variables[i] == 'index'):
result.append(a.index())
elif (variables[i] == 'name'):
result.append(a.name())
elif (variables[i] == 'loc'):
result.append(a.loc())
elif (variables[i] == 'resname'):
result.append(a.resname())
elif (variables[i] == 'chain'):
result.append(a.chain())
elif (variables[i] == 'resid'):
result.append(a.resid())
elif (variables[i] == 'rescode'):
result.append(a.rescode())
elif (variables[i] == 'x'):
result.append(coor[0, :, 0]())
elif (variables[i] == 'y'):
result.append(coor[0, :, 1]())
elif (variables[i] == 'z'):
result.append(coor[0, :, 2]())
elif (variables[i] == 'occupancy'):
result.append(a.occupancy())
elif (variables[i] == 'beta'):
result.append(a.beta())
elif (variables[i] == 'segname'):
result.append(a.segname())
elif (variables[i] == 'element'):
result.append(a.element())
elif (variables[i] == 'charge'):
result.append(a.charge())
elif (variables[i] == 'moltype'):
result.append(a.moltype())
value = 1
except:
value = 0
result = None
except:
value = 0
result = None
return value, result
def replace_tail(sasmol, basis_to_python):
# mv_A_to_E()
mono_file = '../../1KX5_tailfold/1KX5tailfold_167bp.pdb'
ncp = sasmol.SasMol(0)
ncp.read_pdb(mono_file)
replace_basis = basis_to_python.parse_basis('chain E and resid < 40')
error, replace_mask = ncp.get_subset_mask(replace_basis)
print sum(replace_mask)
histone_file = '1KX5tailfold_A2E_2.pdb'
new_histone = sasmol.SasMol(0)
new_histone.read_pdb(histone_file)
print new_histone.coor().shape
part_histone = sasmol.SasMol(0)
part_basis = basis_to_python.parse_basis('resid < 40')
error, part_mask = new_histone.get_subset_mask(part_basis)
new_histone.copy_molecule_using_mask(part_histone, part_mask, 0)
ncp.set_coor_using_mask(part_histone, 0, replace_mask)
ncp.write_pdb('1KX5tailfold_fxd2.pdb', 0, 'w')
def dna_main(pdb_file_name, number_of_groups, residues_in_groups, rotate_type,
group_to_rotate, residue_to_rotate, angle, theta, backward,
dna_segnames, dna_resids, bp_per_bead):
if rotate_type == 'ds_dna':
# determine which bead has the 'residue_to_rotate' in it
bead_to_rotate = 9
for i in xrange(100):
# treating this as thetaX
theta = theta + (5.0 * numpy.pi / 180.0)
thetaXYZ = [theta, 0, 0]
# rotate that bead
rotate_a_group_2(this_group, rotate_type, residue_to_rotate, angle,
theta, backward)
(cg_dna.coor()[0][bead_to_rotate:], vecXYZ[:, bead_to_rotate:],
dummy) = ddmc.beadRotate(cg_dna.coor()[0][bead_to_rotate - 1:],
vecXYZ[:, bead_to_rotate - 1:], thetaXYZ,
numpy.zeros((0, 3)))
# s rotate_dna_group(this_group, rotate_type, residue_to_rotate,
# angle, theta, backward)
else:
mol = sasmol.SasMol(0)
mol.read_pdb(pdb_file_name)
groups, group_masks = make_groups(mol, number_of_groups,
residues_in_groups)
this_group = groups[group_to_rotate]
itheta = theta
for i in xrange(100):
theta = theta + (5.0 * numpy.pi / 180.0)
rotate_a_group(this_group, rotate_type, residue_to_rotate, angle,
theta, backward)
return
def main(pdb_file_name, residues_in_groups, rotate_type, group_to_rotate,
residue_to_rotate, angle, theta, backward, segnames_in_groups,
seg_type_in_groups):
txtOutput = multiprocessing.JoinableQueue()
hybrid = sasmol.SasMol(0)
hybrid.read_pdb(pdb_file_name)
# this assumes that every residue is unique -> separate segs could have same resids
# groups, group_masks = make_groups(hybrid, number_of_groups, residues_in_groups)
groups, group_masks = make_complex_groups(hybrid, residues_in_groups,
segnames_in_groups)
this_group = groups[group_to_rotate]
this_group.write_pdb('this_group.pdb', 0, 'w')
dcd_out = this_group.open_dcd_write('this_group.dcd')
for i in xrange(100):
theta = theta + (5.0 * numpy.pi / 180.0)
before = numpy.copy(this_group.coor())
if rotate_type == 'protein_backbone_dihedral':
rotate_a_group(this_group, rotate_type, residue_to_rotate, angle,
theta, backward)
elif rotate_type == 'ds_nucleic':
residues_in_group = residues_in_groups[group_to_rotate]
segnames_in_group = segnames_in_groups[group_to_rotate]
seg_type_in_group = seg_type_in_groups[group_to_rotate]
rotate_a_nucleic_group(this_group, rotate_type, residue_to_rotate,
angle, theta, backward, residues_in_group,
segnames_in_group, seg_type_in_group,
txtOutput)
after = numpy.copy(this_group.coor())
diff = after - before
print numpy.mean(diff), numpy.max(diff)
this_group.write_dcd_step(dcd_out, 0, i + 1)
this_group.close_dcd_write(dcd_out)
return
def build_ball_coordinates(ball_diameter, fc_to_fab_vector_length,
miniumum_base_angle):
coor = numpy.zeros((1, 3, 3), numpy.float)
coor_1 = numpy.zeros((1, 3), numpy.float)
coor_2 = numpy.zeros((1, 3), numpy.float)
coor_3 = numpy.zeros((1, 3), numpy.float)
coor_2[0][2] = fc_to_fab_vector_length
m1 = sasmol.SasMol(0)
dum = numpy.copy(coor_2)
m1.setCoor(dum)
frame = 0
m1.rotate(frame, 'y', minimum_base_angle)
coor_3 = m1.coor()
print 'coor_1 = ', coor_1[0]
print 'coor_2 = ', coor_2[0]
print 'coor_3 = ', coor_3[0]
dist_1_2 = numpy.sqrt(numpy.sum((coor_1[0] - coor_2[0])**2.0))
dist_1_3 = numpy.sqrt(numpy.sum((coor_1[0] - coor_3[0])**2.0))
dist_2_3 = numpy.sqrt(numpy.sum((coor_2[0] - coor_3[0])**2.0))
print 'dist_1_2 = ', dist_1_2
print 'dist_1_3 = ', dist_1_3
print 'dist_2_3 = ', dist_2_3
print 'ball_diameter = ', ball_diameter
coor[0][0] = coor_1[0]
coor[0][1] = coor_2[0]
coor[0][2] = coor_3[0]
get_pdb_values(m1, 3)
m1.setCoor(coor)
m1.write_pdb('three_ball.pdb', frame, 'w')
return m1
def make_groups(hybrid, number_of_groups, residues_in_groups):
frame = 0
resid = hybrid.resid()
group_masks = []
groups = []
for i in xrange(number_of_groups):
this_resids = residues_in_groups[i]
for j in xrange(len(this_resids)):
if (j == 0):
basis = 'resid[i] == ' + str(this_resids[j]) + ' '
else:
basis += ' or resid[i] == ' + str(this_resids[j])
print '>> creating basis = ', basis
error, mask = hybrid.get_subset_mask(basis)
group_masks.append(mask)
this_group = sasmol.SasMol(0)
error = hybrid.copy_molecule_using_mask(this_group, mask, frame)
groups.append(this_group)
return groups, group_masks
def combine_pdbs(all_pdbs, out_pdb=None):
'''
given a list of pdb files, this will combine them into one pdb
inputs:
all_pdbs - list of pdb file names
out_pdb - optional file name to save the combined pdbs to
outputs:
combined_mol - the combined sasmol object
see also:
combine_sasmols
'''
all_mols = []
for (i, pdb) in enumerate(all_pdbs):
mol = sasmol.SasMol(0)
mol.read_pdb(pdb)
all_mols.append(mol)
combined_mol = combine_sasmols(all_mols)
if out_pdb:
combined_mol.write_pdb(out_pdb, 0, 'w')
return combined_mol
def check_pdb_dcd(infile, filetype):
fileexist = 0
value = 0
try:
fileexist = os.path.isfile(infile)
if (fileexist):
binary = check_binary(infile)
print 'binary = ', binary
test_mol = sasmol.SasMol(0)
fileexist = 1
if (filetype == 'pdb' and not binary):
test_mol.read_pdb(infile, fastread=True)
elif (filetype == 'dcd' and binary):
test_mol.read_single_dcd_step(infile, 0)
else:
return fileexist, value
value = 1
else:
return fileexist, value
except:
value = 0
return fileexist, value
def align(variables, txtOutput):
'''
ALIGN is the function to read in variables from GUI input and
overlap the molecules in a dcd/pdb file onto the coordinates of
a reference pdb structure over a given basis.
runname: project name
path: input/output filepath
pdbmol1: reference pdb (mol 1)
pdbmol2: input pdb file (mol 2)
infile: input (pdb or dcd) filename (mol 2)
basis1: basis for molecule 1
basis2: basis for molecule 2
lowres1: low residue for overlap molecule 1
highres1: high residue for overlap molecule 1
lowres2: low residue for overlap molecule 2
highres2: high residue for overlap molecule 2
OUTPUT:
files stored in "runname"/align directory
ofile: output filename
ofile*.minmax: text file with min & max dimensions
'''
runname, path, infile, pdbmol1, pdbmol2, basis1, lowres1, highres1, basis2, lowres2, highres2, ofile = unpack_variables(
variables)
alignpath = runname + '/align/'
direxist = os.path.exists(alignpath)
if (direxist == 0):
os.system('mkdir -p ' + alignpath)
print 'runname = ', runname
dcd = []
dcd.append(infile)
ndcd = 1
minmaxfile = ofile + '.minmax'
mmfile = open(alignpath + minmaxfile, 'w')
ttxt = time.ctime()
st = ''.join(['=' for x in xrange(60)])
txtOutput.put("\n%s \n" % (st))
txtOutput.put("DATA FROM RUN: %s \n\n" % (ttxt))
m1 = sasmol.SasMol(0)
m2 = sasmol.SasMol(1)
m1.readpdb(path + pdbmol1)
m2.readpdb(path + pdbmol2)
try:
if (infile[-3:] == 'dcd'):
m2.readdcd(path + infile)
elif (infile[-3:] == 'pdb'):
m2.readpdb(path + infile)
except:
message = 'input filename is a PDB or DCD file but it must end with ".pdb" or ".dcd" '
message += ' : stopping here'
print_failure(message, txtOutput)
nf2 = m2.number_of_frames()
txtOutput.put("Total number of frames = %d\n\n" % (nf2))
mass1 = m1.mass()
mass2 = m2.mass()
name1 = m1.name()
name2 = m2.name()
basis_filter_1 = 'name[i] == "' + basis1 + '" and (resid[i] >= ' + str(
lowres1) + ' and resid[i] <= ' + str(highres1) + ')'
basis_filter_2 = 'name[i] == "' + basis2 + '" and (resid[i] >= ' + str(
lowres2) + ' and resid[i] <= ' + str(highres2) + ')'
error, mask1 = m1.get_subset_mask(basis_filter_1)
error, mask2 = m2.get_subset_mask(basis_filter_2)
print 'numpy.sum(mask1) = ', numpy.sum(mask1)
print 'numpy.sum(mask2) = ', numpy.sum(mask2)
sub_m1 = sasmol.SasMol(2)
error = m1.copy_molecule_using_mask(sub_m1, mask1, 0)
print 'error = ', error
sub_m2 = sasmol.SasMol(3)
error = m2.copy_molecule_using_mask(sub_m2, mask2, 0)
print 'error = ', error
com_sub_m1 = sub_m1.calccom(0)
sub_m1.center(0)
coor_sub_m1 = sub_m1.coor()[0]
print 'com_sub_m1 = ', com_sub_m1
for i in xrange(nf2):
m2.center(i)
error, sub_m2.coor = m2.get_coor_using_mask(i, mask2)
sub_m2.setCoor(sub_m2.coor)
com_sub_m2 = sub_m2.calccom(0)
sub_m2.center(0)
coor_sub_m2 = sub_m2.coor[0]
m2.align(i, coor_sub_m2, com_sub_m2, coor_sub_m1, com_sub_m1)
if (((i + 1) % (float(nf2) / 10.0) == 0 or (nf2 < 10))):
fraction_done = (float(i + 1) / float(nf2))
progress_string = 'COMPLETED ' + \
str(i + 1) + ' of ' + str(nf2) + ' : ' + \
str(fraction_done * 100.0) + ' % done'
print('%s\n' % progress_string)
report_string = 'STATUS\t' + str(fraction_done)
txtOutput.put(report_string)
try:
if (ofile[-3:] == 'dcd'):
print ' writing DCD file'
m2.writedcd(alignpath + ofile)
elif (ofile[-3:] == 'pdb' and nf2 == 1):
print ' writing PDB file'
m2.writepdb(alignpath + ofile, 0, 'w')
elif (ofile[-3:] == 'pdb' and nf2 > 1):
print ' writing PDB file'
for i in xrange(nf2):
if (i == 0):
m2.writepdb(alignpath + ofile, i, 'w')
else:
m2.writepdb(alignpath + ofile, i, 'a')
else:
message = 'output filename ' + ofile + \
' needs to end in either ".pdb" (1 frame) or ".dcd" (1 or more frames)\n'
message += ' : writing output file as a ' + ofile + '.dcd\n'
print '\n\n', message, '\n\n'
print ' writing DCD file'
ofile = ofile + '.dcd'
m2.writedcd(alignpath + ofile)
except:
message = 'Could not write output file'
print_failure(message, txtOutput)
total_min_array, total_max_array = m2.calcminmax()
min_x = total_min_array[0]
max_x = total_max_array[0]
min_y = total_min_array[1]
max_y = total_max_array[1]
min_z = total_min_array[2]
max_z = total_max_array[2]
txtOutput.put(
"minimum x = %lf\t maximum x = %lf -> range: %lf Angstroms\n" %
(min_x, max_x, (max_x - min_x)))
txtOutput.put(
"minimum y = %lf\t maximum y = %lf -> range: %lf Angstroms\n" %
(min_y, max_y, (max_y - min_y)))
txtOutput.put(
"minimum z = %lf\t maximum z = %lf -> range: %lf Angstroms\n\n" %
(min_z, max_z, (max_z - min_z)))
print 'Aligned data (nf=%i) were written to %s\n' % (nf2, './' +
alignpath + ofile)
txtOutput.put("\nAligned data (nf=%i) were written to %s\n\n" %
(nf2, './' + alignpath + ofile))
txtOutput.put("\n%s \n" % (st))
time.sleep(0.5)
print 'ALIGN2 IS DONE'
return ()
def main(inputs):
# aa_pdb = '../1zbb_tetra_uncombined.pdb'
# aa_pdb = '1zbb_original.pdb'
aa = sasmol.SasMol(0)
aa.read_pdb(inputs.pdb)
segname_mols = []
errors = []
amino_acids = {
'ALA': 'A',
'ARG': 'R',
'ASN': 'N',
'ASP': 'D',
'CYS': 'C',
'GLU': 'E',
'GLN': 'Q',
'GLY': 'G',
'HIS': 'H',
'ILE': 'I',
'LEU': 'L',
'LYS': 'K',
'MET': 'M',
'PHE': 'F',
'PRO': 'P',
'SER': 'S',
'THR': 'T',
'TRP': 'W',
'TYR': 'Y',
'VAL': 'V',
'HSE': 'H'
}
dna = {
'G': 'G',
'A': 'A',
'T': 'T',
'C': 'C',
'DG': 'G',
'DA': 'A',
'DT': 'T',
'DC': 'C',
'GUA': 'G',
'ADE': 'A',
'THY': 'T',
'CYT': 'C'
}
# segnames = ['I','J']
# print 'segnames =', segnames
print 'inputs.segnames =', inputs.segnames
for segname in inputs.segnames:
if segname.lower() == segname:
segname_name = '_seg_' + segname + '0'
else:
segname_name = '_seg_' + segname + '1'
segname_name = inputs.pdb[:-4] + segname_name
basis_filter = "(segname[i] == '" + segname + "')"
error, mask = aa.get_subset_mask(basis_filter)
if error:
print error
segname_mol = sasmol.SasMol(0)
error = aa.copy_molecule_using_mask(segname_mol, mask, 0)
if error:
print error
segname_mol.write_pdb(segname_name + '.pdb', 0, 'w')
segname_mols.append(segname_mol)
# resids.sort()
resA = 0
res_min = np.min(segname_mol.resids())
res_max = np.max(segname_mol.resids())
print 'min resid:', res_min
resA = 0
residue_list = []
# create a sorted list of the residues
for (i, resB) in enumerate(segname_mol.resid()):
if resB != resA:
# print 'segname_mol.resname()[i]:', segname_mol.resname()[i]
# print 'segname_mol.resid()[i]:', segname_mol.resid()[i]
residue_list.append(residue(resB, segname_mol.resname()[i]))
resA = resB
residue_sequence = sorted(residue_list,
key=lambda residue: residue.resid)
# with open(segname_name+'.txt', 'w') as outFile:
# for res in residue_sequence:
#outFile.write(str(res.resid) + '\t' + res.resname + '\n')
if 'rna' in segname_mol.moltypes():
segname_mol.moltypes().remove('rna')
print "removed 'rna' from moltypes"
if len(segname_mol.moltypes()) == 0:
segname_mol.moltypes().append('dna')
print "appended 'dna' to moltypes"
with open(segname_name + '.seq', 'w') as outFile:
print outFile.closed
if segname_mol.moltypes() == ['protein']:
for (i, res) in enumerate(residue_sequence):
outFile.write(amino_acids[res.resname])
if 0 == (i + 1) % 50:
outFile.write('\n')
elif segname_mol.moltypes() == ['dna']:
for (i, res) in enumerate(residue_sequence):
outFile.write(dna[res.resname])
# print 'printed', dna[res.resname], 'to', segname_name,
# '.seq'
if 0 == (i + 1) % 50:
outFile.write('\n')
else:
print 'ERROR, unexpected molecule type'
# s for resB in resids:
# s if resB != resA + 1:
# s print 'missing residue/s, skipped segname', segname, 'btwn residues:', resA, resB
# s resA = resB
print 'max resid:', res_max
print 'finished segname', segname_name
print outFile.closed
print 'COMPLETE'
def two_body_grid(variables, txtOutput):
runname, path, pdbmol1, pdbmol2, ofile, accpos, pos, trans, dtrans, theta, dtheta, basis, cutoff, lowrg, highrg, zflag, zcutoff, cflag, confile, nexsegments1, nsegments1, reslow1, numcont1, nexsegments2, nsegments2, reslow2, numcont2 = unpack_variables(
variables)
if (runname[-1] == '/'):
lin = len(runname)
runname = runname[:lin - 1]
direxist = os.path.exists(runname)
if (direxist == 0):
os.system('mkdir -p ' + runname)
genpath = runname + '/two_body_grid'
genpaths = genpath + '/'
direxist = os.path.exists(genpath)
if (direxist == 0):
os.system('mkdir -p ' + genpath)
m1 = sasmol.SasMol(0)
m2 = sasmol.SasMol(1)
m3 = sasmol.SasMol(2)
m1.read_pdb(path + '/' + pdbmol1)
m2.read_pdb(path + '/' + pdbmol2)
error = m3.merge_two_molecules(m1, m2)
if (error != []):
print 'ERROR:' + error[0]
print 'ERROR:' + error[0]
print 'ERROR:' + error[0]
m3.write_pdb(genpaths + ofile + '.pdb', 0, 'w')
cpst = 'cp ' + path + '/' + pdbmol1 + ' ' + genpaths
os.system(cpst)
cpst = 'cp ' + path + '/' + pdbmol2 + ' ' + genpaths
os.system(cpst)
frame = 0
mm1 = m1.calcminmax()
mm2 = m2.calcminmax()
'''
print 'mm1 = ',mm1
print 'mm2 = ',mm2
'''
# set overlap basis for each molecule
segment_names_1 = string.split(nsegments1, ',')
segment_names_2 = string.split(nsegments2, ',')
'''
print 'segment_names_1 = ',segment_names_1
print 'segment_names_2 = ',segment_names_2
'''
if (nexsegments1 > 0):
for i in xrange(nexsegments1):
if (i == 0):
basis1st = "(name[i] == 'CA' and not (segname[i] == '" + segment_names_1[
i] + "' and ( resid[i] >= " + str(
reslow1[i]) + " and resid[i] <= " + str(
reslow1[i] + numcont1[i]) + ")))"
else:
basis1st = basis1st + " or (name[i] == 'CA' and not (segname[i] == '" + segment_names_1[
i] + "' and ( resid[i] >= " + str(
reslow1[i]) + " and resid[i] <= " + str(
reslow1[i] + numcont1[i]) + " )))"
else:
basis1st = "name[i] == 'CA'"
'''
print 'basis1st = ',basis1st
'''
if (nexsegments2 > 0):
for i in xrange(nexsegments2):
if (i == 0):
basis2st = "(name[i] == 'CA' and not (segname[i] == '" + segment_names_2[
i] + "' and ( resid[i] >= " + str(
reslow2[i]) + " and resid[i] <= " + str(
reslow2[i] + numcont2[i]) + ")))"
else:
basis2st = basis2st + " or (name[i] == 'CA' and not (segname[i] == '" + segment_names_2[
i] + "' and ( resid[i] >= " + str(
reslow2[i]) + " and resid[i] <= " + str(
reslow2[i] + numcont2[i]) + " )))"
else:
basis2st = "name[i] == 'CA'"
'''
print 'basis2st = ',basis2st
'''
error, mask_array1 = m1.get_subset_mask(basis1st)
error, mask_array2 = m2.get_subset_mask(basis2st)
if (cflag == 1):
filter_flag = 0
error, constraint_basis1_array, constraint_basis2_array, distance_array, type_array = constraints.read_constraints(
m3, confile, filter_flag)
mask_a_array = []
mask_b_array = []
for i in xrange(len(distance_array)):
print constraint_basis1_array[i]
print constraint_basis2_array[i]
print distance_array[i]
print type_array[i]
error, local_mask_a_array = m3.get_subset_mask(
constraint_basis1_array[i])
error, local_mask_b_array = m3.get_subset_mask(
constraint_basis2_array[i])
mask_a_array.append(local_mask_a_array)
mask_b_array.append(local_mask_b_array)
else:
mask_a_array = []
mask_b_array = []
distance_array = []
type_array = []
#molgrid(m1,m2,m3,ofile,genpaths,accpos,pos,trans,dtrans,theta,dtheta,cutoff,basis,mask_array1,mask_array2,zflag,zcutoff,cflag,mask_a_array,mask_b_array,distance_array,type_array,txtOutput)
fft_docking(m1, m2, m3, ofile, genpaths, accpos, pos, trans, dtrans, theta,
dtheta, cutoff, basis, mask_array1, mask_array2, zflag,
zcutoff, cflag, mask_a_array, mask_b_array, distance_array,
type_array, txtOutput)
return
import os
import os.path as op
import subprocess
import logging
import sassie.sasmol.sasmol as sasmol
import numpy as np
# chain1_out = 'dimer/dna1_right_seq.pdb'
# chain1_pdb = 'dimer/dna1_wrong_seq.pdb'
# chain1 = sasmol.SasMol(0)
# chain1.read_pdb(chain1_pdb)
# sequenceFile = 'dimer/dimer_dna1_correct.seq'
chain1_out = 'gH5_NCP_dna1.pdb'
chain1_pdb = 'gH5_NCP_dna1bb.pdb'
chain1 = sasmol.SasMol(0)
chain1.read_pdb(chain1_pdb)
sequenceFile = 'correct_dna1.seq'
chain2_out = 'gH5_NCP_dna2.pdb'
chain2_pdb = 'gH5_NCP_dna2bb.pdb'
chain2 = sasmol.SasMol(0)
chain2.read_pdb(chain2_pdb)
with open(sequenceFile) as f:
lines = f.read().splitlines()
sequence = lines[0]
reverse = sequence[::-1]
amino_acids_pdb2seq = {
'ALA': 'A',
if __name__ == '__main__':
basis = []
basis.append('(name CA and name NH) or resid > 43')
basis.append('(name CA and name NH) or resid > 43 and resid < 57')
basis.append('segname HC1 and (resid >= 210 and resid <=214)')
basis.append('segname HC1 and resid < 210')
basis.append('(resid > 23 and resid < 68) and name "CA"')
for i in xrange(5):
print '#####'
new_basis = parse_basis(basis[i])
print
print
import sassie.sasmol.sasmol as sasmol
m = sasmol.SasMol(0)
m.read_pdb('min3.pdb')
basis = '(resid > 23 and resid < 68) and name "CA"'
python_basis = parse_basis(basis)
sub_mol = sasmol.SasMol(0)
frame = 0
error, mask = m.get_subset_mask(python_basis)
if (len(error) > 0):
print 'error = ', error
import numpy
print numpy.sum(mask)
def driven_dna_mc(ARGS,
cg_dna,
aa_dna,
cg_pro,
aa_pro,
vecXYZ,
lp,
trialbeads,
beadgroups,
group_masks,
all_beads,
dna_bead_masks,
aa_pgroup_masks,
cg_pgroup_masks,
all_proteins,
aa_all,
aa_pro_mask,
aa_dna_mask,
dna_type='b'):
'''
this function perform nsteps Monte-Carlo moves on the cg_dna
'''
timestr = time.strftime("%y%m%d_%H%M%S_") # prefix for output files
all_dcd_name = timestr + ARGS.pdb[:-4] + '.dcd'
aa_all_dcd_out = aa_all.open_dcd_write(all_dcd_name)
if False:
aa_all.send_coordinates_to_vmd(2222, 0)
# create the coarse-grained DNA and protein dcd and pdb files
cg_dna_dcd_name = timestr + 'cg_dna.dcd'
cg_pro_dcd_name = timestr + 'cg_pro.dcd'
cg_dna_dcd_out = cg_dna.open_dcd_write(cg_dna_dcd_name)
cg_pro_dcd_out = cg_pro.open_dcd_write(cg_pro_dcd_name)
cg_dna.write_dcd_step(cg_dna_dcd_out, 0, 1)
cg_pro.write_dcd_step(cg_pro_dcd_out, 0, 1)
cg_dna.write_pdb(timestr + 'cg_dna.pdb', 0, 'w')
cg_pro.write_pdb(timestr + 'cg_pro.pdb', 0, 'w')
# create a dummy sasmol object for the 3 orientation vectors for each bead
# will write these out to dcd files to store the coordinates along the way
vecX_mol = sasmol.SasMol(0)
vecY_mol = sasmol.SasMol(0)
vecZ_mol = sasmol.SasMol(0)
error, mask = cg_dna.get_subset_mask('(all)')
error = cg_dna.copy_molecule_using_mask(vecX_mol, mask, 0)
error = cg_dna.copy_molecule_using_mask(vecY_mol, mask, 0)
error = cg_dna.copy_molecule_using_mask(vecZ_mol, mask, 0)
# the np.array recast these so they
vecX_mol.setCoor(np.array([vecXYZ[0]]))
vecY_mol.setCoor(np.array([vecXYZ[1]])) # do not update with vecXYZ
vecZ_mol.setCoor(np.array([vecXYZ[2]]))
vecX_dcd_name = timestr + 'vecX.dcd'
vecY_dcd_name = timestr + 'vecY.dcd'
vecZ_dcd_name = timestr + 'vecZ.dcd'
vecX_dcd_out = vecX_mol.open_dcd_write(vecX_dcd_name)
vecY_dcd_out = vecY_mol.open_dcd_write(vecY_dcd_name)
vecZ_dcd_out = vecZ_mol.open_dcd_write(vecZ_dcd_name)
vecX_mol.write_dcd_step(vecX_dcd_out, 0, 1)
vecY_mol.write_dcd_step(vecY_dcd_out, 0, 1)
vecZ_mol.write_dcd_step(vecZ_dcd_out, 0, 1)
# initialize variables for each run
steps_from_0 = np.zeros(ARGS.nsteps, dtype='int64')
xyz = np.copy(vecXYZ)
d_coor = np.copy(cg_dna.coor()[0]) # unique memory for each
p_coor = np.copy(cg_pro.coor()[0]) # unique memory for each
# vectors between beads u, and average distance l
(u, l) = dna_move.checkU(d_coor)
# s print "(u, l) =", (u, l) # debug info
lpl = lp / l # setup the presistence length paramater
# yet to use a, and z type dna
dna_energy_width = {'a': 0, 'b': 46., 'z': 0}
w = dna_energy_width[dna_type.lower()]
if w > l:
w = np.floor(l)
# print '~~~ %.2f > %.2f ~~~~~~~~~~~~~~~~~~~~~~~~' % (w, l)
print('>>> setting chain width (w) to %d (chain width < distance' % w,
' btwn beads)')
dna_diam = {'a': 25.5, 'b': 23.7, 'z': 18.4}
dna_bead_radius = 4.5
pro_bead_radius = 1.0 # 2A min seperation of CA atoms in database
pro_pro_test = pro_bead_radius + pro_bead_radius
dna_pro_test = dna_bead_radius + pro_bead_radius
# calculate the energy of the starting positions
wca0 = np.zeros((cg_dna.natoms(), cg_dna.natoms()))
Ub0 = dna_move.energyBend(lpl, u, l)
(Uwca0, wca0) = dna_move.f_energy_wca(w, d_coor, wca0, 0)
U_T0 = Ub0 + Uwca0
# print '(Ub0, Uwca0, Ub0/U_T0, Uwca0/U_T0) = ', (Ub0, Uwca0, Ub0/U_T0,
# Uwca0/U_T0)
n_accept = 0 # total times configuration was accepted
n_reject = 0 # total times configuration was rejected
n_written = 0 # total times dcd write has been called
fail_tally = 0 # number of times failed for particular iteration
n_from_reload = 0 # number of stps since last reload
n_reload = [0] # listt containing the i_goback values
# this should not actually be >=, come back to this
assert np.size(ARGS.theta_max) - 1 >= np.max(beadgroups), (
'each group needs its own theta_max: %d < %d' %
(np.size(ARGS.theta_max) - 1, np.max(beadgroups)))
rg_old = cg_dna.calcrg(0)
# Main MC loop #
while n_accept < ARGS.nsteps:
# Choose a bead to rotate
trial_bead = trialbeads[int((trialbeads.size) * np.random.random())]
# Determine rotation to perform
theta_max = ARGS.theta_max[beadgroups[trial_bead]]
# option to scale thetaZ separatly
thetaZ_max = 0 * np.float(theta_max)
# thetaZ_max = np.float(theta_max) # option to scale thetaZ separatly
thetaZ = 2 * thetaZ_max * np.random.random() - thetaZ_max
thetaX = 2 * theta_max * np.random.random() - theta_max
thetaY = 2 * theta_max * np.random.random() - theta_max
thetaXYZ = [
thetaX / ARGS.n_soft, thetaY / ARGS.n_soft, thetaZ / ARGS.n_soft
]
# print theta_max, thetaXYZ
if len(group_masks) == 0 or beadgroups[trial_bead] == len(group_masks):
# Only DNA will be moving, create place-holder dummy coordinates
p_coor_rot = np.zeros((0, 3))
else:
p_mask = group_masks[beadgroups[trial_bead]]
p_ind_rot = mask2ind(p_mask)
p_ind_fix = mask2ind(-(p_mask - 1))
p_coor_rot = p_coor[p_ind_rot]
p_coor_fix = p_coor[p_ind_fix]
# generate a newly rotated model
(d_coor[trial_bead:], xyz[:, trial_bead:],
p_coor_rot) = dna_move.beadRotate(d_coor[trial_bead - 1:],
xyz[:, trial_bead - 1:], thetaXYZ,
ARGS.n_soft, p_coor_rot)
# store the rotated protein coordinates
if beadgroups[trial_bead] < len(group_masks):
p_coor[p_ind_rot] = p_coor_rot
# verify the Rg_new < Rg_old * 1.01
d_coor_old = np.copy(cg_dna.coor()[0])
cg_dna.setCoor(np.array([(d_coor)])) # update dna coordinates
rg_new = cg_dna.calcrg(0)
if rg_new < rg_old * 1.01:
rg_pass = True
print 'rg_old * 1.01 < rg_new: %f < %f' % (rg_old * 1.01, rg_new)
else:
rg_pass = False
print 'rg_old * 1.01 > rg_new: %f > %f' % (rg_old * 1.01, rg_new)
if rg_pass:
# calculate the change in energy (dU) and the boltzman factor (p)
(u, l) = dna_move.checkU(d_coor)
Ub1 = dna_move.energyBend(lpl, u, l)
# ~~~~ DNA interaction energy ~~~~~~#
(Uwca1, wca1) = dna_move.f_energy_wca(w, d_coor, wca0, trial_bead)
U_T1 = Ub1 + Uwca1
dU = U_T1 - U_T0
with warnings.catch_warnings():
warnings.filterwarnings('error') # need this for np warnings
try:
p = np.exp(-dU)
except Warning:
if dU > 99:
p = 0
# s print 'energy was large, setting probability to 0'
elif dU < 0:
p = 1
# s print 'energy was negative, setting probability to
# 1'
else:
print 'Warning: ~~> unclear OverflowError <~~ dU = ', dU
print 'not sure where the error originated from'
test = np.random.random()
if p <= test:
dna_pass = False
# print 'step failed because of DNA energy'
else:
dna_pass = True
# now check for collisions protein involved collisions
if len(p_coor_rot) > 0: # only if proteins were rotated
# ~~~~ Check for overlap, DNA-protein or protein-protein ~~~~~~#
d_coor_fix = d_coor[trial_bead:]
d_coor_rot = d_coor[:trial_bead]
# check for protein-protein overlap
if 1 == f_overlap2(p_coor_rot, p_coor_fix, pro_pro_test):
print 'Protein-Protein'
# print 'collision, set p=0'
collisionless = False
# print 'currently ignoring DNA-protein overlap'
# check for DNA-protein overlap
elif 1 == f_overlap2(p_coor_rot, d_coor_fix, dna_pro_test):
print 'Potein-DNA (rot-fix)'
# print 'collision, set p=0'
collisionless = False
print 'ignoring this for now'
elif 1 == f_overlap2(p_coor_fix, d_coor_rot, dna_pro_test):
print 'Potein-DNA (fix-rot)'
# print 'collision, set p=0'
collisionless = False
else:
collisionless = True
if not collisionless:
print 'failed because of collision'
else:
collisionless = True # no protein to collide with
if rg_pass and dna_pass and collisionless:
rg_old = rg_new
n_from_reload += 1
steps_from_0[n_accept] = n_from_reload + n_reload[-1]
n_accept += 1 # increment accept counter
# cg_dna.setCoor(d_coor) # <-- DO NOT use setCoor, want uniuqe mem
# cg_pro.setCoor(p_coor) # <-- DO NOT use setCoor, want uniuqe mem
cg_pro.setCoor(np.array([(p_coor)])) # update protein coordinates
vecXYZ = np.copy(xyz) # update dna orientations
vecX_mol.setCoor(np.array([vecXYZ[0]])) # independent of vecXYZ[0]
vecY_mol.setCoor(np.array([vecXYZ[1]])) # independent of vecXYZ[1]
vecZ_mol.setCoor(np.array([vecXYZ[2]])) # independent of vecXYZ[2]
wca0 = np.copy(wca1) # update DNA WCA energy
U_T0 = U_T1 # update total energy
# print output regarding trial
print "trial_bead(%3d) = %2d\t failed attempts = %2d" % (
n_accept, trial_bead, fail_tally)
fail_tally = 0 # reset fail_tally
# print out the Rg
print cg_dna.calcrg(0)
# write out the accepted configuration for go-back use
if ARGS.goback > 0:
# these are incremented by one because the original coordinates
# are saved (that is not the case for aa_all)
cg_dna.write_dcd_step(cg_dna_dcd_out, 0, n_written + 1)
cg_pro.write_dcd_step(cg_pro_dcd_out, 0, n_written + 1)
vecX_mol.write_dcd_step(vecX_dcd_out, 0, n_written + 1)
vecY_mol.write_dcd_step(vecY_dcd_out, 0, n_written + 1)
vecZ_mol.write_dcd_step(vecZ_dcd_out, 0, n_written + 1)
# recover an all atom representation and save coordinates to a dcd
# this requires re-inserting the aa-coordinates which takes added
# time so only do when designated
if 0 == n_accept % ARGS.n_dcd_write:
# ~~recover aa-DNA~~
error = dna_move.recover_aaDNA_model(cg_dna, aa_dna, vecXYZ,
all_beads, dna_bead_masks)
# ~~recover aa-Protein~~
dna_move.recover_aaPro_model(aa_pgroup_masks, cg_pgroup_masks,
cg_pro, all_proteins, aa_pro)
# ~~Combine aa Complete Structure~~
aa_all.set_coor_using_mask(aa_pro, 0, aa_pro_mask)
aa_all.set_coor_using_mask(aa_dna, 0, aa_dna_mask)
# ~~Write DCD step~~
n_written += 1
aa_all.write_dcd_step(aa_all_dcd_out, 0, n_written)
else:
# default ARGS.goback is -1 so this returns FALSE without user
# input
if fail_tally == ARGS.goback:
i_goback = rewind(ARGS, n_accept, cg_dna_dcd_name, cg_dna,
cg_pro_dcd_name, cg_pro, vecX_dcd_name,
vecX_mol, vecY_mol, vecY_dcd_name, vecZ_mol,
vecZ_dcd_name, vecXYZ)
# revert dna coordinates
cg_dna.setCoor(np.array([(d_coor_old)]))
d_coor = np.copy(cg_dna.coor()[0]) # reset the dna coordinates
# reset the reference energy
(u, l) = checkU(d_coor)
(Uwca0, wca0) = f_energy_wca(w, d_coor, wca0, 0)
Ub0 = energyBend(lpl, u, l)
U_T0 = Ub0 + Uwca0
n_from_reload = 0
n_reload.append(steps_from_0[i_goback - 1])
fail_tally = 0 # reset the fail counter
else:
fail_tally += 1 # increment bead reject counter
# increment total reject counter
n_reject += 1
# revert dna coordinates
cg_dna.setCoor(np.array([(d_coor_old)]))
d_coor = np.copy(cg_dna.coor()[0]) # reset the dna coordinates
p_coor = np.copy(cg_pro.coor()[0]) # reset the protein coordinates
xyz = np.copy(vecXYZ) # reset the dna orientations
# save previous coordinates again
if not ARGS.keep_unique:
# ~~Write DCD step~~
n_written += 1
aa_all.write_dcd_step(aa_all_dcd_out, 0, n_written)
cg_dna.write_dcd_step(cg_dna_all_dcd_out, 0, n_written + 1)
cg_pro.write_dcd_step(cg_pro_all_dcd_out, 0, n_written + 1)
aa_all.close_dcd_write(aa_all_dcd_out)
cg_dna.close_dcd_write(cg_dna_dcd_out) # uncomment if wanting to keep
# os.remove(timestr + 'cg_dna.pdb') # remove/comment to keep the cg dna coor
# os.remove(cg_dna_dcd_name) # remove/comment to keep the cg dna coor
# cg_pro.close_dcd_write(cg_pro_dcd_out) #uncomment if wanting to keep
os.remove(timestr + 'cg_pro.pdb') # remove/comment to keep the cg pro coor
os.remove(cg_pro_dcd_name) # remove/comment to keep the cg pro coor
os.remove(vecX_dcd_name)
os.remove(vecY_dcd_name)
os.remove(vecZ_dcd_name)
if ARGS.goback > 0:
np.savetxt(timestr + 'n_from_0.txt', steps_from_0, fmt='%d')
print "accepted %d moves" % n_accept
print "rejected %d moves" % n_reject
