def generate_enantiomers(
molecule: oechem.OEGraphMol,
max_centers: int = 12,
force_flip: bool = False,
enumerate_nitrogens: bool = True,
) -> List[oechem.OEGraphMol]:
"""
Generate enantiomers of a given molecule.
Parameters
----------
molecule: oechem.OEGraphMol
An OpenEye molecule.
max_centers: int
The maximal number of stereo centers to enumerate.
force_flip: bool
If specified stereo centers should be ignored.
enumerate_nitrogens: bool
If nitrogens with invertible pyramidal geometry should be enumerated.
Returns
-------
enantiomers: list of oechem.OEGraphMol
A list of OpenEye molecules holding the enantiomers.
"""
from openeye import oechem, oeomega
enantiomers = [
oechem.OEGraphMol(enantiomer) for enantiomer in oeomega.OEFlipper(
molecule, max_centers, force_flip, enumerate_nitrogens)
]
return enantiomers
def expand_stereochemistry(mols):
"""Expand stereochemistry when uncertain
Parameters
----------
mols : openeye.oechem.OEGraphMol
Molecules to be expanded
Returns
-------
expanded_mols : openeye.oechem.OEMol
Expanded molecules
"""
expanded_mols = list()
from openeye import oechem, oeomega
omegaOpts = oeomega.OEOmegaOptions()
omega = oeomega.OEOmega(omegaOpts)
maxcenters = 12
forceFlip = False
enumNitrogen = True
warts = True # add suffix for stereoisomers
for mol in mols:
for enantiomer in oeomega.OEFlipper(mol, maxcenters, forceFlip, enumNitrogen, warts):
enantiomer = oechem.OEMol(enantiomer)
expanded_mols.append(enantiomer)
return expanded_mols
def main(argv=[__name__]):
if len(argv) != 3:
oechem.OEThrow.Usage("%s <infile> <outfile>" % argv[0])
ifs = oechem.oemolistream()
if not ifs.open(argv[1]):
oechem.OEThrow.Fatal("Unable to open %s for reading" % argv[1])
ofs = oechem.oemolostream()
if not ofs.open(argv[2]):
oechem.OEThrow.Fatal("Unable to open %s for writing" % argv[2])
if not oechem.OEIs3DFormat(ofs.GetFormat()):
oechem.OEThrow.Fatal("Invalid output file format for 3D coordinates!")
omegaOpts = oeomega.OEOmegaOptions()
omega = oeomega.OEOmega(omegaOpts)
for mol in ifs.GetOEMols():
oechem.OEThrow.Info("Title: %s" % mol.GetTitle())
for enantiomer in oeomega.OEFlipper(mol.GetActive(), 12, True):
enantiomer = oechem.OEMol(enantiomer)
ret_code = omega.Build(enantiomer)
if ret_code == oeomega.OEOmegaReturnCode_Success:
oechem.OEWriteMolecule(ofs, enantiomer)
else:
oechem.OEThrow.Warning(
"%s: %s" %
(enantiomer.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
return 0
def FromMol(mol, isomer=True, num_enantiomers=-1):
"""
Generates a set of conformers as an OEMol object
Inputs:
mol is an OEMol
isomers is a boolean controling whether or not the various diasteriomers of a molecule are created
num_enantiomers is the allowable number of enantiomers. For all, set to -1
"""
omegaOpts = oeomega.OEOmegaOptions()
omegaOpts.SetMaxConfs(199)
omega = oeomega.OEOmega(omegaOpts)
out_conf = []
ofs = oechem.oemolostream("test.sdf")
if not isomer:
ret_code = omega.Build(mol)
if ret_code == oeomega.OEOmegaReturnCode_Success:
out_conf.append(mol)
else:
oechem.OEThrow.Warning("%s: %s" % (mol.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
elif isomer:
for enantiomer in oeomega.OEFlipper(mol.GetActive(), 12, True):
enantiomer = oechem.OEMol(enantiomer)
ret_code = omega.Build(enantiomer)
if ret_code == oeomega.OEOmegaReturnCode_Success:
out_conf.append(enantiomer)
num_enantiomers -= 1
oechem.OEWriteMolecule(ofs, mol)
if num_enantiomers == 0:
break
else:
oechem.OEThrow.Warning("%s: %s" % (mol.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
return out_conf
def enumerate_from_smiles(smiles, oe_options=None):
oe_options = oe_options or OEOptions()
omegaOpts = oeomega.OEOmegaOptions(oeomega.OEOmegaSampling_Pose)
omegaOpts.SetMaxSearchTime(60)
omega = oeomega.OEOmega(omegaOpts)
if oe_options.use_tautomer:
tautomer_options = oequacpac.OETautomerOptions()
pKa_norm = True
taut_iter = lambda x: oequacpac.OEGetReasonableTautomers(x, tautomer_options, pKa_norm)
else:
taut_iter = lambda x: [x]
if oe_options.use_flipper:
flipper = lambda x: oeomega.OEFlipper(x.GetActive(), oe_options.num_sterocenters, oe_options.force_flipper)
else:
flipper = lambda x: [x]
# get molecule
try:
molecule = mol_from_smiles(smiles)
except ValueError:
return [None]
results = []
for enantiomer in flipper(molecule):
for tautomer in taut_iter(enantiomer):
tautomer = oechem.OEMol(tautomer)
omega.Build(tautomer)
tautomer2 = oechem.OEMol(tautomer)
results.append(tautomer2)
return results
def FromMol(mol, use_flipper=True, num_sterocenters=12, force_flipper=False):
"""
Generates a set of conformers as an OEMol object
Inputs:
mol is an OEMol
isomers is a boolean controling whether or not the various diasteriomers of a molecule are created
num_enantiomers is the allowable number of enantiomers. For all, set to -1
"""
omegaOpts = oeomega.OEOmegaOptions()
omegaOpts.SetMaxConfRange("200,800")
omegaOpts.SetRangeIncrement(8)
omegaOpts.SetMaxSearchTime(30)
omega = oeomega.OEOmega(omegaOpts)
out_conf = []
for enantiomer in oeomega.OEFlipper(mol.GetActive(), num_sterocenters,
force_flipper):
enantiomer = oechem.OEMol(enantiomer)
ret_code = omega.Build(enantiomer)
if ret_code == oeomega.OEOmegaReturnCode_Success:
out_conf.append(enantiomer)
else:
oechem.OEThrow.Warning(
"%s: %s" % (mol.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
return out_conf
def from_oemol(self, from_oemol):
with self.logger("from_oemol") as logger:
tautomer_options = oequacpac.OETautomerOptions()
tautomer_options.SetMaxTautomersGenerated(4096)
tautomer_options.SetMaxTautomersToReturn(16)
tautomer_options.SetCarbonHybridization(True)
tautomer_options.SetMaxZoneSize(50)
tautomer_options.SetApplyWarts(True)
pKa_norm = True
omegaOpts = oeomega.OEOmegaOptions(oeomega.OEOmegaSampling_Pose)
omegaOpts.SetStrictAtomTypes(False)
omegaOpts.SetSampleHydrogens(True)
omegaOpts.SetMaxSearchTime(30)
omegaOpts.SetFixDeleteH(True)
omega = oeomega.OEOmega(omegaOpts)
options = oeshape.OEROCSOptions()
overlayoptions = oeshape.OEOverlayOptions()
overlayoptions.SetOverlapFunc(
oeshape.OEOverlapFunc(oeshape.OEAnalyticShapeFunc()))
options.SetOverlayOptions(overlayoptions)
# options.SetNumBestHits(10)
options.SetConfsPerHit(200)
# options.SetMaxHits(10000)
rocs = oeshape.OEROCS(options)
for tautomer in oequacpac.OEGetReasonableTautomers(
from_oemol, tautomer_options, pKa_norm):
logger.log("got enantiomer")
for enantiomer in oeomega.OEFlipper(tautomer, 4, False):
logger.log("got tautomer ")
enantiomer_ = oechem.OEMol(enantiomer)
ret_code = omega.Build(enantiomer_)
if ret_code != oeomega.OEOmegaReturnCode_Success:
logger.error("got oemeg_failed",
oeomega.OEGetOmegaError(ret_code))
else:
rocs.AddMolecule(oechem.OEMol(enantiomer_))
for res in rocs.Overlay(self.refmol):
outmol = oechem.OEMol(res.GetOverlayConfs())
good_mol = oechem.OEMol(outmol)
oechem.OEAddExplicitHydrogens(good_mol)
oechem.OEClearSDData(good_mol)
oeshape.OEDeleteCompressedColorAtoms(good_mol)
oeshape.OEClearCachedSelfColor(good_mol)
oeshape.OEClearCachedSelfShape(good_mol)
oeshape.OERemoveColorAtoms(good_mol)
return good_mol
logger.error("Returning None.")
return None
def expand_stereochemistry(mols):
"""Expand stereochemistry when uncertain
Parameters
----------
mols : openeye.oechem.OEGraphMol
Molecules to be expanded
Returns
-------
expanded_mols : openeye.oechem.OEMol
Expanded molecules
"""
expanded_mols = list()
from openeye import oechem, oeomega
omegaOpts = oeomega.OEOmegaOptions()
omega = oeomega.OEOmega(omegaOpts)
maxcenters = 12
forceFlip = False
enumNitrogen = False
warts = True # add suffix for stereoisomers
for mol in mols:
compound_title = mol.GetTitle()
compound_smiles = oechem.OEMolToSmiles(mol)
enantiomers = list()
for enantiomer in oeomega.OEFlipper(mol, maxcenters, forceFlip,
enumNitrogen, warts):
enantiomer = oechem.OEMol(enantiomer)
enantiomer_smiles = oechem.OEMolToSmiles(enantiomer)
oechem.OESetSDData(enantiomer, 'compound', compound_title)
oechem.OESetSDData(enantiomer, 'compound_smiles', compound_smiles)
oechem.OESetSDData(enantiomer, 'enantiomer_smiles',
enantiomer_smiles)
enantiomers.append(enantiomer)
expanded_mols += enantiomers
# DEBUG
if 'EDJ-MED-e4b030d8-2' in mol.GetTitle():
msg = 'Enumerated microstates for compound: '
msg += mol.GetTitle() + '\n'
msg += f'{"":5s} ' + oechem.OEMolToSmiles(mol) + '\n'
for index, m in enumerate(enantiomers):
msg += f'{index:5d} : ' + oechem.OEMolToSmiles(m) + '\n'
print(msg)
return expanded_mols
def gen_conf(mol):
oemols = []
omegaOpts = oeomega.OEOmegaOptions(oeomega.OEOmegaSampling_FastROCS)
omega = oeomega.OEOmega(omegaOpts)
for enantiomer in oeomega.OEFlipper(mol.GetActive(), 6, True):
enantiomer = oechem.OEMol(enantiomer)
ret_code = omega.Build(enantiomer)
if ret_code == oeomega.OEOmegaReturnCode_Success:
halfMol = oechem.OEMol(mol, oechem.OEMCMolType_HalfFloatCartesian)
oemols.append(halfMol)
else:
oechem.OEThrow.Warning(
"%s: %s" %
(enantiomer.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
return oemols
def expand_stereochemistry(mols):
"""Expand stereochemistry when uncertain
Parameters
----------
mols : openeye.oechem.OEGraphMol
Molecules to be expanded
Returns
-------
expanded_mols : openeye.oechem.OEMol
Expanded molecules
"""
expanded_mols = list()
from openeye import oechem, oeomega
omegaOpts = oeomega.OEOmegaOptions()
omega = oeomega.OEOmega(omegaOpts)
maxcenters = 12
forceFlip = False
enumNitrogen = True
warts = True # add suffix for stereoisomers
for mol in mols:
compound_title = mol.GetTitle()
compound_smiles = oechem.OEMolToSmiles(mol)
enantiomers = list()
for enantiomer in oeomega.OEFlipper(mol, maxcenters, forceFlip,
enumNitrogen, warts):
enantiomer = oechem.OEMol(enantiomer)
enantiomer_smiles = oechem.OEMolToSmiles(enantiomer)
oechem.OESetSDData(enantiomer, 'compound', compound_title)
oechem.OESetSDData(enantiomer, 'compound_smiles', compound_smiles)
oechem.OESetSDData(enantiomer, 'enantiomer_smiles',
enantiomer_smiles)
enantiomers.append(enantiomer)
expanded_mols += enantiomers
return expanded_mols
def _enumerate_stereoisomers(molecule,
max_states=200,
force_flip=True,
enum_nitrogen=True,
warts=True,
verbose=True):
"""
Enumerate stereoisomers
Parameters
----------
molecule : OEMol
max_states : int, optional, default 200
max number of states to enumerate
force_flip : bool, optional, default True
If True, will flip all steocenters. If False, will only flip centers that are undefined
enum_nitrogen : bool, optional, default True
Invert non-planar nitrogen
warts : bool, optional, default True
If True, add int to molecule name
verbose : bool, optional, default True
Returns
-------
stereoisomers: list of oemols
"""
from openeye import oeomega, oechem
stereoisomers = []
if verbose:
logger().debug("Enumerating stereoisomers...")
i = 0
for enantiomer in oeomega.OEFlipper(molecule, max_states, force_flip,
enum_nitrogen, warts):
i += 1
enantiomer = oechem.OEMol(enantiomer)
stereoisomers.append(enantiomer)
return stereoisomers
def compute_conformers(smiles=None, smiles_file=None, start_index=0, batch_size=0, out_file=None, bad_file=None, save_csv=False, overwrite=False, save_gzip=False, license=None, timeout=0, max_failures=2):
import csv
import os
from openeye import oechem
from openeye import oeomega
from openeye import oemolprop
import signal
os.environ['OE_LICENSE'] = license
if save_gzip or save_csv:
raise Exception("GZip and CSV not supported")
if not overwrite and os.path.exists(out_file):
raise Exception("File exists: %s" % out_file)
if smiles_file:
with open(smiles_file) as current:
current.seek(start_index)
smiles = [current.readline() for i in range(batch_size)]
if len(smiles) == 0:
return ""
# function to compute enantiomers
# separated out so we can use an alarm to timeout
def get_enan(omega, enan):
enan = oechem.OEMol(enan)
ret = omega.Build(enan)
return enan, ret
def alarm_handler(signum, frame):
#print("ALARM signal received")
raise Exception()
#ofs = oechem.oemolostream()
#ofs.SetFormat(oechem.OEFormat_OEB)
#if not ofs.open(out_file):
# oechem.OEThrow.Fatal("Unable to open %s for writing" % out_file)
sep = ","
bad = []
mols = []
for s in smiles:
mol = s.split(sep)
if len(mol) > 1:
mols.append(mol[2].rstrip())
# put all mols in a string as we're told it is faster to process this way
in_smiles = "\n".join(mols)
ims = oechem.oemolistream()
ims.SetFormat(oechem.OEFormat_SMI)
ims.openstring(in_smiles)
# Turn off logging except errors
oechem.OEThrow.SetLevel(5)
filt = oemolprop.OEFilter(oemolprop.OEFilterType_BlockBuster)
#ofs.open(out_file)
signal.signal(signal.SIGALRM, alarm_handler)
oe_results = []
for mol in ims.GetOEMols():
if filt(mol):
oemols = []
ret_code = None
omegaOpts = oeomega.OEOmegaOptions(oeomega.OEOmegaSampling_FastROCS)
omega = oeomega.OEOmega(omegaOpts)
failures = 0
for enantiomer in oeomega.OEFlipper(mol.GetActive(), 6, True):
if max_failures > 0 and failures >= max_failures:
break
if len(oemols) >= 10:
break
ret_code = None
error = False
signal.alarm(timeout)
try:
enantiomer, ret_code = get_enan(omega, enantiomer)
except:
print("Timeout %s" % out_file)
failures += 1
error = True
signal.alarm(0)
if not error and ret_code == oeomega.OEOmegaReturnCode_Success:
halfMol = oechem.OEMol(mol, oechem.OEMCMolType_HalfFloatCartesian)
oemols.append(halfMol)
#else:
#oechem.OEThrow.Warning("%s: %s" %
# (enantiomer.GetTitle(), oeomega.OEGetOmegaError(ret_code)))
oe_results.append(oemols)
ofs = oechem.oemolostream()
ofs.SetFormat(oechem.OEFormat_OEB)
ofs.open(out_file)
for r in oe_results:
for res in r:
oechem.OEWriteMolecule(ofs, res)
ofs.close()
return out_file
def _expand_states(molecules, enumerate='protonation', max_states=200, suppress_hydrogen=True, reasonable=True,
carbon_hybridization=True, level=0, verbose=True):
"""
Expand the state specified by enumerate variable
Parameters
----------
molecules: OEMol or list of OEMol
molecule to expand states
enumerate: str, optional, default='protonation'
Kind of state to enumerate. Choice of protonation, tautomers, stereoiserms
suppress_hydrogen: bool, optional, default=True
If True, will suppress explicit hydrogen
reasonable: bool, optional, default=True
If True, will rank tautomers by the most reasonable energetically
carbon_hybridization: bool, optional, default=True
If True, will allow carbon to change hybridization
max_states: int, optional, default=200
verbose: Bool, optional, deault=TRue
Returns
-------
states: list of OEMol
enumerated states
"""
if type(molecules) != type(list()):
molecules = [molecules]
states = list()
for molecule in molecules:
ostream = oechem.oemolostream()
ostream.openstring()
ostream.SetFormat(oechem.OEFormat_SDF)
states_enumerated = 0
if suppress_hydrogen:
oechem.OESuppressHydrogens(molecule)
if enumerate == 'protonation':
formal_charge_options = oequacpac.OEFormalChargeOptions()
formal_charge_options.SetMaxCount(max_states)
formal_charge_options.SetVerbose(verbose)
if verbose:
logger().debug("Enumerating protonation states...")
for protonation_state in oequacpac.OEEnumerateFormalCharges(molecule, formal_charge_options):
states_enumerated += 1
oechem.OEWriteMolecule(ostream, protonation_state)
states.append(protonation_state)
if enumerate == 'tautomers':
#max_zone_size = molecule.GetMaxAtomIdx()
tautomer_options = oequacpac.OETautomerOptions()
tautomer_options.SetMaxTautomersGenerated(max_states)
tautomer_options.SetLevel(level)
tautomer_options.SetRankTautomers(reasonable)
tautomer_options.SetCarbonHybridization(carbon_hybridization)
#tautomer_options.SetMaxZoneSize(max_zone_size)
tautomer_options.SetApplyWarts(True)
if verbose:
logger().debug("Enumerating tautomers...")
for tautomer in oequacpac.OEEnumerateTautomers(molecule, tautomer_options):
states_enumerated += 1
states.append(tautomer)
if enumerate == 'stereoisomers':
if verbose:
logger().debug("Enumerating stereoisomers...")
for enantiomer in oeomega.OEFlipper(molecule, max_states, True):
states_enumerated += 1
enantiomer = oechem.OEMol(enantiomer)
oechem.OEWriteMolecule(ostream, enantiomer)
states.append(enantiomer)
return states
