def amber99(selection="(all)",quiet=0,_self=cmd): cmd=_self result = 1 # first, set all parameters to zero cmd.alter(selection,"partial_charge=0") cmd.alter(selection,"elec_radius=0.0") cmd.alter(selection,"text_type=''") # next, flag all atoms so that we'll be able to detect what we miss cmd.flag(23,selection,'set') # get the amber99 dictionary if not hasattr(champ,'amber99_dict'): from chempy.champ.amber99 import amber99_dict champ.amber99_dict = amber99_dict # iterate through the residue dictionary matching each residue based on chemistry # and generating the expressions for reassigning formal charges alter_list = [] for resn in champ.amber99_dict.keys(): if cmd.select(tmp_sele1,"(%s) and resn %s"%(selection,resn))>0: entry = champ.amber99_dict[resn] for rule in entry: model = cmd.get_model(tmp_sele1) ch = Champ() model_pat = ch.insert_model(model) ch.pattern_detect_chirality(model_pat) assn_pat = ch.insert_pattern_string(rule[0]) ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match tag = atom_tag[1][0] prop_list = rule[1][tag] # the following expression both changes the formal charge and resets flag 23 alter_list.append([atom_tag[0], "name='''%s''';text_type='''%s''';partial_charge=%f;elec_radius=%f;flags=flags&-8388609"%prop_list]) # now evaluate all of these expressions efficiently en-masse cmd.alter_list(selection,alter_list) # see if we missed any atoms missed_count = cmd.count_atoms("("+selection+") and flag 23") if missed_count>0: if not quiet: # looks like we did, so alter the user print " WARNING: %d atoms did not have properties assigned"%missed_count result = 0 # remove the temporary selection we used to select appropriate residues cmd.delete(tmp_sele1) return result
def missing_c_termini(selection="(all)", quiet=0, _self=cmd): cmd = _self # assumes that hydogens are not present! sele_list = [] ch = Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("[N+0+1]C[C;D2]<0>(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat, model_pat, 10000, 2) > 0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1]) == 1: # one and only one match if atom_tag[1][0] == 0: sele_list.append(atom_tag[0]) cmd.select_list(tmp_sele1, selection, sele_list, mode='index') while cmd.pop(tmp_sele2, tmp_sele1) > 0: # complete the carboxy terminus cmd.edit(tmp_sele2) cmd.attach("O", 1, 1, "OXT", quiet=1) cmd.unpick() cmd.delete(tmp_sele1)
def missing_c_termini(selection="(all)",quiet=0,_self=cmd): cmd=_self # assumes that hydogens are not present! sele_list = [] ch=Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("[N+0+1]C[C;D2]<0>(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match if atom_tag[1][0]==0: sele_list.append(atom_tag[0]) cmd.select_list(tmp_sele1,selection,sele_list, mode='index') while cmd.pop(tmp_sele2,tmp_sele1)>0: # complete the carboxy terminus cmd.edit(tmp_sele2) cmd.attach("O",1,1,"OXT",quiet=1) cmd.unpick() cmd.delete(tmp_sele1)
def formal_charges(selection="(all)", quiet=0, _self=cmd): cmd = _self result = 1 # assumes that hydogens are not present! # first, set all formal charges to zero cmd.alter(selection, "formal_charge=0") # next, flag all atoms so that we'll be able to detect what we miss cmd.flag(23, selection, 'set') # get the residue dictionary for formal charges if not hasattr(champ, 'formal_charge_dict'): from chempy.champ.formal_charges import formal_charge_dict champ.formal_charge_dict = formal_charge_dict # iterate through the residue dictionary matching each residue based on chemistry # and generating the expressions for reassigning formal charges alter_list = [] for resn in champ.formal_charge_dict.keys(): if cmd.select(tmp_sele1, "(%s) and resn %s" % (selection, resn)) > 0: entry = champ.formal_charge_dict[resn] for rule in entry: model = cmd.get_model(tmp_sele1) ch = Champ() model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string(rule[0]) ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat, model_pat, 10000, 2) > 0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1]) == 1: # one and only one match tag = atom_tag[1][0] formal_charge = rule[1][tag] # the following expression both changes the formal charge and resets flag 23 alter_list.append([ atom_tag[0], "formal_charge=%d;flags=flags&-8388609" % formal_charge ]) if 1: # n-terminal amine # non-proline ch = Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("[N;D1]<0>CC(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat, model_pat, 10000, 2) > 0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1]) == 1: # one and only one match if atom_tag[1][0] == 0: # the following expression both changes the formal charge and resets flag 23 alter_list.append([ atom_tag[0], "formal_charge=1;flags=flags&-8388609" ]) # proline residues ch = Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("C1CC[N;D2]<0>C1C(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat, model_pat, 10000, 2) > 0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1]) == 1: # one and only one match if atom_tag[1][0] == 0: # the following expression both changes the formal charge and resets flag 23 alter_list.append([ atom_tag[0], "formal_charge=1;flags=flags&-8388609" ]) if 1: # c-terminal acid ch = Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("NCC(=O<0>)[O;D1]<1>") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat, model_pat, 10000, 2) > 0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1]) == 1: # one and only one match if atom_tag[1][0] == 1: # the following expression both changes the formal charge and resets flag 23 alter_list.append([ atom_tag[0], "formal_charge=-1;flags=flags&-8388609" ]) # now evaluate all of these expressions efficiently en-masse cmd.alter_list(selection, alter_list) # see if we missed any atoms missed_count = cmd.count_atoms("(" + selection + ") and flag 23") if missed_count > 0: if not quiet: # looks like we did, so alter the user print(" WARNING: %d atoms did not have formal charges assigned" % missed_count) result = 0 # remove the temporary selection we used to select appropriate residues cmd.delete(tmp_sele1) return result
def formal_charges(selection="(all)",quiet=0,_self=cmd): cmd=_self result = 1 # assumes that hydogens are not present! # first, set all formal charges to zero cmd.alter(selection,"formal_charge=0") # next, flag all atoms so that we'll be able to detect what we miss cmd.flag(23,selection,'set') # get the residue dictionary for formal charges if not hasattr(champ,'formal_charge_dict'): from chempy.champ.formal_charges import formal_charge_dict champ.formal_charge_dict = formal_charge_dict # iterate through the residue dictionary matching each residue based on chemistry # and generating the expressions for reassigning formal charges alter_list = [] for resn in champ.formal_charge_dict.keys(): if cmd.select(tmp_sele1,"(%s) and resn %s"%(selection,resn))>0: entry = champ.formal_charge_dict[resn] for rule in entry: model = cmd.get_model(tmp_sele1) ch = Champ() model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string(rule[0]) ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match tag = atom_tag[1][0] formal_charge = rule[1][tag] # the following expression both changes the formal charge and resets flag 23 alter_list.append([atom_tag[0], "formal_charge=%d;flags=flags&-8388609"%formal_charge]) if 1: # n-terminal amine # non-proline ch=Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("[N;D1]<0>CC(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match if atom_tag[1][0]==0: # the following expression both changes the formal charge and resets flag 23 alter_list.append([atom_tag[0], "formal_charge=1;flags=flags&-8388609"]) # proline residues ch=Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("C1CC[N;D2]<0>C1C(=O)") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match if atom_tag[1][0]==0: # the following expression both changes the formal charge and resets flag 23 alter_list.append([atom_tag[0], "formal_charge=1;flags=flags&-8388609"]) if 1: # c-terminal acid ch=Champ() model = cmd.get_model(selection) model_pat = ch.insert_model(model) assn_pat = ch.insert_pattern_string("NCC(=O<0>)[O;D1]<1>") ch.pattern_clear_tags(model_pat) if ch.match_1v1_n(assn_pat,model_pat,10000,2)>0: result = ch.pattern_get_ext_indices_with_tags(model_pat) for atom_tag in result[0]: # just iterate over atom tags if len(atom_tag[1])==1: # one and only one match if atom_tag[1][0]==1: # the following expression both changes the formal charge and resets flag 23 alter_list.append([atom_tag[0], "formal_charge=-1;flags=flags&-8388609"]) # now evaluate all of these expressions efficiently en-masse cmd.alter_list(selection,alter_list) # see if we missed any atoms missed_count = cmd.count_atoms("("+selection+") and flag 23") if missed_count>0: if not quiet: # looks like we did, so alter the user print " WARNING: %d atoms did not have formal charges assigned"%missed_count result = 0 # remove the temporary selection we used to select appropriate residues cmd.delete(tmp_sele1) return result