def structure_gen(self, pep_seq):
if not os.path.exists("strs"):
os.makedirs("strs")
print "Structure being Generated !"
b = len(pep_seq)
bar = Bar('Processing PEPTIDES', fill='>', max=b)
for seq in pep_seq:
try:
pep = Peptide(seq, nterm="charged", cterm="neutral")
pep.regularize()
pep.write_pdb(os.path.join("./strs", seq + ".pdb"))
bar.next()
obConversion = openbabel.OBConversion()
obConversion.SetInAndOutFormats("pdb", "sdf")
mol = openbabel.OBMol()
obConversion.ReadFile(mol,
os.path.join("./strs", seq + ".pdb"))
mol.AddHydrogens()
obConversion.WriteFile(mol,
os.path.join("./strs", seq + ".sdf"))
except:
pass
bar.finish()
print "Structure Generation Finished !"
def generate_peptide(sequence, sample, output, seed, number):
start = time.time()
set_seed(seed)
for i in range(number):
pept = Peptide(sequence.upper(), nterm="neutral", cterm="neutral")
pept.sample_bb_angles(sample)
if sequence[sample] != "P":
pept.sample_chi_angles(sample)
if output is None:
name = sequence + '_{:06d}.pdb'.format(i)
else:
name = output + '_{:06d}.pdb'.format(i)
pept.write_pdb(str(name))
bb = pept.get_bb_angles(2)
print(bb)
# print("TE : {:12.4f}".format(time.time() - start))
return True
pep = Peptide(sequence, nterm="neutral", cterm="charged")
print("SMILES: ", pep.get_smiles())
print("Charge: ", pep.get_charge())
print("Length: ", pep.get_length())
print("Sequence:", pep.get_sequence())
# Set [PHI, PSI] angles for residues 1, 2 and 3
pep.set_bb_angles(1, [ -156.3, 142.3])
pep.set_bb_angles(2, [ 48.8, 42.3])
pep.set_bb_angles(3, [ 81.3, 0.2])
# Set and read chi angles for residue 2
pep.set_chi_angles(2, [ -50.6, -75.1])
print(pep.get_bb_angles(2))
# Sample (and set) backbone angles for residue 2
print(pep.sample_bb_angles(2))
print(pep.get_bb_angles(2))
# Sample (and set) chi angles for residue 2
print(pep.sample_chi_angles(2))
print(pep.get_chi_angles(2))
# Write files
pep.write_xyz("pep.xyz")
pep.write_pdb("pep.pdb", QUIET=False)
pep = Peptide(sequence, nterm="neutral", cterm="charged")
print "SMILES: ", pep.get_smiles()
print "Charge: ", pep.get_charge()
print "Length: ", pep.get_length()
print "Sequence:", pep.get_sequence()
# Set [PHI, PSI] angles for residues 1, 2 and 3
pep.set_bb_angles(1, [ -156.3, 142.3])
pep.set_bb_angles(2, [ 48.8, 42.3])
pep.set_bb_angles(3, [ 81.3, 0.2])
# Set and read chi angles for residue 2
pep.set_chi_angles(2, [ -50.6, -75.1])
print pep.get_bb_angles(2)
# Sample (and set) backbone angles for residue 2
print pep.sample_bb_angles(2)
print pep.get_bb_angles(2)
# Sample (and set) chi angles for residue 2
print pep.sample_chi_angles(2)
print pep.get_chi_angles(2)
# Write files
pep.write_xyz("pep.xyz")
pep.write_pdb("pep.pdb", QUIET=False)
for l1 in aas:
# Define sequence
seq = "A" + l1 * 10 + "A"
print seq
# Create peptide
pep = Peptide(seq, nterm="charged", cterm="charged")
# Sample (and set) backbone angles for residue 2
for i in range(10):
pep.sample_bb_angles(2 + i)
print pep.get_bb_angles(2 + i)
# Sample (and set) chi angles for residue 2
try:
pep.sample_chi_angles(2 + i)
print pep.get_chi_angles(2 + i)
except:
pass
# MMFF94 optimization
pep.optimize()
# Write files
filename = seq + ".pdb"
pep.write_pdb(filename, QUIET=False)
