def __init__(self, mol_config: MolConfig, max_steps=200):
super(ConformerEnv, self).__init__()
logging.info('initializing conformer environment')
self.config = copy.deepcopy(mol_config)
self.max_steps = max_steps
self.total_reward = 0
self.current_step = 0
self.step_info = {}
self.episode_info = {}
self.mol = self.config.mol
# set mol to have exactly one conformer
if self.mol.GetNumConformers() != 1:
logging.warn(
"Input molecule to environment should have exactly one conformer, none or more than one detected."
)
self.mol.RemoveAllConformers()
if Chem.EmbedMolecule(self.mol,
randomSeed=self.config.seed,
useRandomCoords=True) == -1:
raise Exception(
'Unable to embed molecule with conformer using rdkit')
self.conf = self.mol.GetConformer()
nonring, ring = TorsionFingerprints.CalculateTorsionLists(self.mol)
self.nonring = [list(atoms[0]) for atoms, ang in nonring]
self.reset()
def butina_clustering_m(rdkit_mol, difference_matrix='tfd', threshold=0.001):
""" Clustering conformers with RDKit's Butina algorithem """
# calculate difference matrix
if difference_matrix.lower() == 'tfd':
diffmat = TorsionFingerprints.GetTFDMatrix(rdkit_mol)
if difference_matrix.lower() == 'rms':
diffmat = AllChem.GetConformerRMSMatrix(rdkit_mol, prealigned=False)
# cluster conformers
num_confs = rdkit_mol.GetNumConformers()
clt = Butina.ClusterData(diffmat,
num_confs,
threshold,
isDistData=True,
reordering=True)
# new conformers
centroid_idx = [c[0] for c in clt] # centroid indexes.
new_rdkit_mol = copy.deepcopy(rdkit_mol)
new_rdkit_mol.RemoveAllConformers()
for idx in centroid_idx:
centroid_conf = rdkit_mol.GetConformer(idx)
new_rdkit_mol.AddConformer(centroid_conf, assignId=True)
del rdkit_mol # delete old mol, is this nessesary?
return new_rdkit_mol
def TFD_for_oemols(ref_mol, query_mol):
"""
This is the TFD_for_oemols script.
It makes use of RDKit's TFD calculation and the function rdmol_from_oemol.
TFD_for_oemols takes in two OEMOLs.
It does not matter which mol is the ref mol and which is the querymol.
TFD metric is the same no matter which is the ref and which is the query.
First, OEmols are made RDKit compatible. Then,
TFD is computed and returned using RDKit's TorsionFingerprints
Module. Takes one input reference mol2 and one input query mol2.
Args:
ref_mol (oemol) An oemol that has already been read in.
query_mol (oemol) An oemol that has already been read in.
Returns:
tfd (float) The torsion fingerprint deviation between ref and query.
"""
# converts refmol to one readable by RDKit
rrdmol2 = rdmol_from_oemol(ref_mol)
# converts querymol to one readable by RDKit
qrdmol2 = rdmol_from_oemol(query_mol)
# If there was a mistake in the conversion process, return -1
if (Chem.MolToSmiles(qrdmol2) != Chem.MolToSmiles(rrdmol2)):
tfd = -1
else:
# calculates the TFD
try:
tfd = TorsionFingerprints.GetTFDBetweenMolecules(rrdmol2, qrdmol2)
except IndexError:
tfd = 0
return tfd
def prune_last_conformer(
mol: Chem.Mol, tfd_thresh: float,
energies: List[float]) -> Tuple[Chem.Mol, List[float]]:
"""Prunes the last conformer of the molecule.
If no conformers in `mol` have a TFD (Torsional Fingerprint Deviation) with the last conformer of less than `tfd_thresh`,
the last conformer is kept. Otherwise, the lowest energy conformer with TFD less than `tfd_thresh` is kept and all other conformers
are discarded.
Parameters
----------
mol : RDKit Mol
The molecule to be pruned. The conformers in the molecule should be ordered by ascending energy.
tfd_thresh : float
The minimum threshold for TFD between conformers.
energies : list of float
A list of all the energies of the conformers in `mol`.
Returns
-------
mol : RDKit Mol
The updated molecule after pruning, with conformers sorted by ascending energy.
energies : list of float
A list of all the energies of the conformers in `mol` after pruning and sorting by ascending energy.
"""
if tfd_thresh < 0 or mol.GetNumConformers() <= 1:
return mol, energies
idx = bisect.bisect(energies[:-1], energies[-1])
tfd = TorsionFingerprints.GetTFDBetweenConformers(
mol,
range(0,
mol.GetNumConformers() - 1), [mol.GetNumConformers() - 1],
useWeights=False)
tfd = np.array(tfd)
# if lower energy conformer is within threshold, drop new conf
if not np.all(tfd[:idx] >= tfd_thresh):
energies = energies[:-1]
mol.RemoveConformer(mol.GetNumConformers() - 1)
return mol, energies
else:
keep = list(range(0, idx))
keep.append(mol.GetNumConformers() - 1)
keep += [
x for x in range(idx,
mol.GetNumConformers() - 1)
if tfd[x] >= tfd_thresh
]
new = Chem.Mol(mol)
new.RemoveAllConformers()
for i in keep:
conf = mol.GetConformer(i)
new.AddConformer(conf, assignId=True)
return new, [energies[i] for i in keep]
def tfd_matrix(mol: Chem.Mol) -> np.array:
"""Calculates the TFD matrix for all conformers in a molecule.
"""
tfd = TorsionFingerprints.GetTFDMatrix(mol, useWeights=False)
n = int(np.sqrt(len(tfd) * 2)) + 1
idx = np.tril_indices(n, k=-1, m=n)
matrix = np.zeros((n, n))
matrix[idx] = tfd
matrix += np.transpose(matrix)
return matrix
def cluster_conformers(mol, mode="RMSD", threshold=2.0):
if mode == "TFD":
dmat = TorsionFingerprints.GetTFDMatrix(mol)
else:
dmat = AllChem.GetConformerRMSMatrix(mol, prealigned=False)
rms_clusters = Butina.ClusterData(dmat,
mol.GetNumConformers(),
threshold,
isDistData=True,
reordering=True)
return rms_clusters
def testTorsionFingerprintsColinearBonds(self):
# test that single bonds adjacent to triple bonds are ignored
mol = Chem.MolFromSmiles('CCC#CCC')
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol,
ignoreColinearBonds=True)
self.assertEqual(len(tors_list), 0)
weights = TorsionFingerprints.CalculateTorsionWeights(mol, ignoreColinearBonds=True)
self.assertEqual(len(weights), 0)
# test that they are not ignored, but alternative atoms searched for
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(
mol, ignoreColinearBonds=False)
self.assertEqual(len(tors_list), 1)
self.assertEqual(tors_list[0][0][0], (0, 1, 4, 5))
weights = TorsionFingerprints.CalculateTorsionWeights(mol, ignoreColinearBonds=False)
self.assertEqual(len(weights), 1)
# test that single bonds adjacent to terminal triple bonds are always ignored
mol = Chem.MolFromSmiles('C#CCC')
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol,
ignoreColinearBonds=True)
self.assertEqual(len(tors_list), 0)
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(
mol, ignoreColinearBonds=False)
self.assertEqual(len(tors_list), 0)
def testTorsionFingerprintsAtomReordering(self):
# we use the xray structure from the paper (JCIM, 52, 1499, 2012): 1DWD
refFile = os.path.join(RDConfig.RDCodeDir,'Chem','test_data','1DWD_ligand.pdb')
ref = Chem.MolFromSmiles('NC(=[NH2+])c1ccc(C[C@@H](NC(=O)CNS(=O)(=O)c2ccc3ccccc3c2)C(=O)N2CCCCC2)cc1')
mol1 = Chem.MolFromPDBFile(refFile)
mol1 = AllChem.AssignBondOrdersFromTemplate(ref, mol1)
refFile = os.path.join(RDConfig.RDCodeDir,'Chem','test_data','1DWD_ligand_reordered.pdb')
mol2 = Chem.MolFromPDBFile(refFile)
mol2 = AllChem.AssignBondOrdersFromTemplate(ref, mol2)
tfd = TorsionFingerprints.GetTFDBetweenMolecules(mol1, mol2)
self.assertEqual(tfd, 0.0)
def calc_tfd(ref_mol, query_mol):
"""
Calculate Torsion Fingerprint Deviation between two molecular structures.
RDKit is required for TFD calculation.
References
----------
Modified from the following code:
https://github.com/MobleyLab/benchmarkff/03_analysis/compare_ffs.py
TFD reference:
https://pubs.acs.org/doi/10.1021/ci2002318
Parameters
----------
ref_mol : RDKit RDMol
query_mol : RDKit RDMol
Returns
-------
tfd : float
Torsion Fingerprint Deviation between ref and query molecules
"""
# check if the molecules are the same
# tfd requires the two molecules must be instances of the same molecule
rsmiles = Chem.MolToSmiles(ref_mol)
qsmiles = Chem.MolToSmiles(query_mol)
if rsmiles != qsmiles:
print(f"- WARNING: The reference mol {ref_mol.GetProp('_Name')} and "
f"query mol {query_mol.GetProp('_Name')} do NOT have the same "
f"SMILES strings as determined by RDKit MolToSmiles. "
f"\n {rsmiles}\n {qsmiles}")
tfd = np.nan
# calculate the TFD
else:
try:
tfd = TorsionFingerprints.GetTFDBetweenMolecules(
ref_mol, query_mol)
# triggered for molecules such as urea
except IndexError:
print(
f"- Error calculating TFD on molecule {ref_mol.GetProp('_Name')}."
" Possibly no non-terminal rotatable bonds found.")
tfd = np.nan
return tfd
def rdkit_tfd(mol):
kernel = TorsionFingerprints.GetTFDMatrix(mol)
return kernel
for mol in mols:
if mol != None:
mol = Chem.AddHs(mol)
conf = AllChem.EmbedMultipleConfs(mol,
numConfs=int(N),
pruneRmsThresh=float(RMS),
useExpTorsionAnglePrefs=True,
useBasicKnowledge=True,
numThreads=int(nbthread))
if len(conf) > 0:
Chem.rdMolAlign.AlignMolConformers(mol)
AllChem.UFFOptimizeMoleculeConfs(mol, numThreads=int(nbthread))
## Here new code to discard identical conformers around an axis of symmetry (not supported by pruneRmsThresh in the previous fct)
matrix = TorsionFingerprints.GetTFDMatrix(mol,
useWeights=False,
maxDev='equal',
symmRadius=2,
ignoreColinearBonds=True)
conf_clusters = Butina.ClusterData(matrix, len(conf), cutoff, True)
confnb = 1
for cluster in conf_clusters:
writer = Chem.SDWriter(output_folder + "/" +
mol.GetProp("_Name") + "_conf_" +
str(confnb) + ".sdf")
writer.write(mol, confId=cluster[0]) # output only centroid
writer.close()
confnb += 1
else:
# not able to make conformers
print("Could not generate any conformers for %s" %
(mol.GetProp("_Name")))
def testGithub4720(self):
# exceptions with highly-coordinated atoms
mol = Chem.MolFromSmiles('S(F)(F)(F)(F)(Cl)c1ccccc1')
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(
mol)
self.assertEqual(len(tors_list), 1)
def calculate(self, mol):
yield tuple(
Torsion(*mol.get_atoms(atoms[0])) for atoms, _ in
(TorsionFingerprints.CalculateTorsionLists(mol.to_rdkit_mol())[0]))
def calc_tfd(ref_mol, query_mol, conf_id_tag):
"""
Calculate Torsion Fingerprint Deviation between two molecular structures.
RDKit is required for TFD calculation.
References
----------
Modified from the following code:
https://github.com/MobleyLab/off-ffcompare
TFD reference:
https://pubs.acs.org/doi/10.1021/ci2002318
Parameters
----------
ref_mol : OEMol
query_mol : OEMol
conf_id_tag : string
label of the SD tag that should be the same for matching conformers
in different files
Returns
-------
tfd : float
Torsion Fingerprint Deviation between ref and query molecules
"""
# convert refmol to one readable by RDKit
ref_rdmol = reader.rdmol_from_oemol(ref_mol)
# convert querymol to one readable by RDKit
que_rdmol = reader.rdmol_from_oemol(query_mol)
# check if the molecules are the same
# tfd requires the two molecules must be instances of the same molecule
rsmiles = Chem.MolToSmiles(ref_rdmol)
qsmiles = Chem.MolToSmiles(que_rdmol)
if rsmiles != qsmiles:
print(f"- WARNING: The reference mol \'{ref_mol.GetTitle()}\' and "
f"query mol \'{query_mol.GetTitle()}\' do NOT have the same "
"SMILES strings as determined by RDKit MolToSmiles. It is "
"possible that they did not have matching SMILES even before "
"conversion from OEMol to RDKit mol. Listing in order the "
"QCArchive SMILES string, RDKit SMILES for ref mol, and "
"RDKit SMILES for query mol:"
f"\n {oechem.OEGetSDData(ref_mol, conf_id_tag)}"
f"\n {rsmiles}\n {qsmiles}")
tfd = np.nan
# calculate the TFD
else:
try:
tfd = TorsionFingerprints.GetTFDBetweenMolecules(
ref_rdmol, que_rdmol)
# triggered for molecules such as urea
except IndexError:
print(
f"- Error calculating TFD on molecule '{ref_mol.GetTitle()}'."
" Possibly no non-terminal rotatable bonds found.")
tfd = np.nan
return tfd
def get_tfd(mol):
return TorsionFingerprints.GetTFDBetweenConformers(mol, [0], [1])
def get_tfd(source_1, source_2, file_in, seed):
confab_tfd_uniform = []
confab_tfd_EI = []
confab_tfd_LCB = []
bo_tfd_confab = []
bo_tfd_uniform = []
bo_tfd_EI = []
bo_tfd_LCB = []
bo_check_EI = []
bo_check_LCB = []
confab_check_EI = []
confab_check_LCB = []
bo_target = []
confab_target = []
for i in range(len(file_in)):
print(file_in.iloc[i,0])
if file_in.iloc[i,2] == "Yes":
if "200" in str(file_in.iloc[i,1]):
basenames = file_in.iloc[i,0] + '/' + file_in.iloc[i,1] + '.sdf'
inputs = os.path.join(source_2, basenames)
ref_mol = Chem.SDMolSupplier(inputs)
else:
basenames = file_in.iloc[i,0] +'/' + file_in.iloc[i,1] + '.sdf'
inputs = os.path.join(source_1, basenames)
ref_mol = Chem.SDMolSupplier(inputs)
bo_target.append(file_in.iloc[i,0])
# read EI_bayes
EI_bases = file_in.iloc[i,0] + "/EI_bayes_{}.sdf".format(seed)
EI_input = os.path.join(source_1, EI_bases)
EI_mol = Chem.SDMolSupplier(EI_input)
# read LCB_bayes
LCB_bases = file_in.iloc[i,0] + "/LCB_bayes_{}.sdf".format(seed)
LCB_input = os.path.join(source_1, LCB_bases)
LCB_mol = Chem.SDMolSupplier(LCB_input)
# read uniform
uniform_bases = file_in.iloc[i,0] + "/uniform_{}.sdf".format(seed)
uniform_input = os.path.join(source_1, uniform_bases)
uniform_mol = Chem.SDMolSupplier(uniform_input)
# read confab
confab_bases = file_in.iloc[i,0] + "/confab.sdf"
confab_input = os.path.join(source_1, confab_bases)
confab_mol = Chem.SDMolSupplier(confab_input)
bo_tfd_EI.append(TFP.GetTFDBetweenMolecules(EI_mol[0], ref_mol[0]))
bo_tfd_LCB.append(TFP.GetTFDBetweenMolecules(LCB_mol[0], ref_mol[0]))
bo_tfd_confab.append(TFP.GetTFDBetweenMolecules(confab_mol[0], ref_mol[0]))
bo_tfd_uniform.append(TFP.GetTFDBetweenMolecules(uniform_mol[0], ref_mol[0]))
else:
basenames = file_in.iloc[i,0] + '/confab.sdf'
inputs = os.path.join(source_1, basenames)
ref_mol = Chem.SDMolSupplier(inputs)
confab_target.append(file_in.iloc[i,0])
# read EI_bayes
EI_bases = file_in.iloc[i,0] + "/EI_bayes_{}.sdf".format(seed)
EI_input = os.path.join(source_1, EI_bases)
EI_mol = Chem.SDMolSupplier(EI_input)
# read LCB_bayes
LCB_bases = file_in.iloc[i,0] + "/LCB_bayes_{}.sdf".format(seed)
LCB_input = os.path.join(source_1, LCB_bases)
LCB_mol = Chem.SDMolSupplier(LCB_input)
# read uniform
uniform_bases = file_in.iloc[i,0] + "/uniform_{}.sdf".format(seed)
uniform_input = os.path.join(source_1, uniform_bases)
uniform_mol = Chem.SDMolSupplier(uniform_input)
confab_tfd_EI.append(TFP.GetTFDBetweenMolecules(EI_mol[0], ref_mol[0]))
confab_tfd_LCB.append(TFP.GetTFDBetweenMolecules(LCB_mol[0], ref_mol[0]))
confab_tfd_uniform.append(TFP.GetTFDBetweenMolecules(uniform_mol[0], ref_mol[0]))
bo_data = pd.DataFrame({"target": bo_target, "Uniform": bo_tfd_uniform, "EI": bo_tfd_EI, "LCB": bo_tfd_LCB, "Confab": bo_tfd_confab, "N_rot": 5}, columns = ["target", "Uniform", "EI", "LCB", "Confab", "N_rot"])
confab_data = pd.DataFrame({'target': confab_target, "Uniform": confab_tfd_uniform, "EI": confab_tfd_EI, "LCB": confab_tfd_LCB, "N_rot":5}, columns = ["target","Uniform","EI","LCB", "N_rot"])
return confab_data, bo_data
def testTorsionFingerprints(self):
# we use the xray structure from the paper (JCIM, 52, 1499, 2012): 1DWD
refFile = os.path.join(RDConfig.RDCodeDir, 'Chem', 'test_data', '1DWD_ligand.pdb')
ref = Chem.MolFromSmiles(
'NC(=[NH2+])c1ccc(C[C@@H](NC(=O)CNS(=O)(=O)c2ccc3ccccc3c2)C(=O)N2CCCCC2)cc1')
mol = Chem.MolFromPDBFile(refFile)
mol = AllChem.AssignBondOrdersFromTemplate(ref, mol)
# the torsion lists
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol)
self.assertEqual(len(tors_list), 11)
self.assertEqual(len(tors_list_rings), 4)
self.assertAlmostEqual(tors_list[-1][1], 180.0, 4)
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol, maxDev='spec')
self.assertAlmostEqual(tors_list[-1][1], 90.0, 4)
self.assertRaises(ValueError, TorsionFingerprints.CalculateTorsionLists, mol, maxDev='test')
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol, symmRadius=0)
self.assertEqual(len(tors_list[0][0]), 2)
# the weights
weights = TorsionFingerprints.CalculateTorsionWeights(mol)
self.assertAlmostEqual(weights[4], 1.0)
self.assertEqual(len(weights), len(tors_list + tors_list_rings))
weights = TorsionFingerprints.CalculateTorsionWeights(mol, 15, 14)
self.assertAlmostEqual(weights[3], 1.0)
self.assertRaises(ValueError, TorsionFingerprints.CalculateTorsionWeights, mol, 15, 3)
# the torsion angles
tors_list, tors_list_rings = TorsionFingerprints.CalculateTorsionLists(mol)
torsions = TorsionFingerprints.CalculateTorsionAngles(mol, tors_list, tors_list_rings)
self.assertEqual(len(weights), len(torsions))
self.assertAlmostEqual(torsions[2][0][0], 232.5346, 4)
# the torsion fingerprint deviation
tfd = TorsionFingerprints.CalculateTFD(torsions, torsions)
self.assertAlmostEqual(tfd, 0.0)
refFile = os.path.join(RDConfig.RDCodeDir, 'Chem', 'test_data', '1PPC_ligand.pdb')
mol2 = Chem.MolFromPDBFile(refFile)
mol2 = AllChem.AssignBondOrdersFromTemplate(ref, mol2)
torsions2 = TorsionFingerprints.CalculateTorsionAngles(mol2, tors_list, tors_list_rings)
weights = TorsionFingerprints.CalculateTorsionWeights(mol)
tfd = TorsionFingerprints.CalculateTFD(torsions, torsions2, weights=weights)
self.assertAlmostEqual(tfd, 0.0691, 4)
tfd = TorsionFingerprints.CalculateTFD(torsions, torsions2)
self.assertAlmostEqual(tfd, 0.1115, 4)
# the wrapper functions
tfd = TorsionFingerprints.GetTFDBetweenMolecules(mol, mol2)
self.assertAlmostEqual(tfd, 0.0691, 4)
mol.AddConformer(mol2.GetConformer(), assignId=True)
mol.AddConformer(mol2.GetConformer(), assignId=True)
tfd = TorsionFingerprints.GetTFDBetweenConformers(mol, confIds1=[0], confIds2=[1, 2])
self.assertEqual(len(tfd), 2)
self.assertAlmostEqual(tfd[0], 0.0691, 4)
tfdmat = TorsionFingerprints.GetTFDMatrix(mol)
self.assertEqual(len(tfdmat), 3)
if pred is None: # in case of failure
entry2RMSD[refEntry] = ''
entry2TFD[refEntry] = ''
continue
predEntry = pred.GetProp('_Name')
assert(refEntry == predEntry)
try:
rmsd = AllChem.GetBestRMS(ref, pred)
except:
rmsd = ''
try:
m = Chem.MolFromSmiles(Chem.MolToSmiles(ref))
ref = AllChem.AssignBondOrdersFromTemplate(m, ref)
pred = AllChem.AssignBondOrdersFromTemplate(m, pred)
tfd = TorsionFingerprints.GetTFDBetweenMolecules(ref, pred)
except:
tfd = ''
entry2RMSD[refEntry] = rmsd
entry2TFD[refEntry] = tfd
# See https://baoilleach.blogspot.com/2010/11/automorphisms-isomorphisms-symmetry.html
print("Entry,SMILES,RMSD,Bond error,Angle error,Torsion error,TFD,Stereo correct")
for ref, pred in zip(pybel.readfile("sdf", refFileName),
pybel.readfile("sdf", predFileName)):
refMol = ref.OBMol
predMol = pred.OBMol
refEntry = refMol.GetTitle()
predEntry = predMol.GetTitle()
assert refEntry == predEntry
