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update_het_dict.py
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update_het_dict.py
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from __future__ import division, print_function
import os, sys
#This script updates the het dictionary used by Reduce to add hydrogens to het groups
#It obsoletes and replaces update_het_dict.sh
#Outline:
#Download the lasted version of the het_dictionary from the PDB
#Reformat certain columns of the het dictionary
#Edit certain functional groups
#Regularize endlines for Windows
#Set filenames and clean up
#----- Download het dict from PDB -----
import urllib
import time
print("Downloading most recent het dict", file=sys.stderr)
#Download the lasted version of the het_dictionary from the PDB
urllib.urlretrieve('ftp://ftp.wwpdb.org/pub/pdb/data/monomers/het_dictionary.txt', 'reduce_wwPDB_het_dict_download.txt')
#Store time of download for versioning
fetchtime = time.strftime("%Y%m%d_%H%M%S")
#----- End download -----
#----- Adjust columns in het dict -----
def make_pdb3_format_atom(atomstring):
#put atoms into a PDB3-like format
#Note that this reformatting does not distinguish between calcium 'CA ' and
# alpha carbons ' CA '. Both will be rendered as ' CA '.
#No issues are known to result, but the possibility remains.
atomstring = atomstring.strip()
l = len(atomstring)
if l == 4: return atomstring
elif l == 3: return ' '+atomstring
elif l == 2: return ' '+atomstring+' '
elif l == 1: return ' '+atomstring+' '
else:
sys.stdout.write("ERROR: Strange atom name |"+atomstring+"|")
sys.exit()
infile = open("reduce_wwPDB_het_dict_download.txt")
outfile = open("reduce_wwPDB_het_dict_adjusted.txt","w")
print("Adjusting atom columns", file=sys.stderr)
for line in infile:
if line.startswith("CONECT"):
x = line.split()
numconnections = '%5s' % x[2]
connections = x[3:]
atomlist = []
for atom in connections:
atomlist.append(make_pdb3_format_atom(atom))
outlist = [x[0]," ",make_pdb3_format_atom(x[1]),numconnections,' '.join(atomlist).rstrip()]
print(''.join(outlist).strip(), file=outfile)
elif line.startswith("RESIDUE"):
x = line.split()
resname = x[1].rjust(3)
members = x[2].strip().rjust(7)
print(x[0]+" "+resname+ members, file=outfile)
elif line.startswith("END"):
print(line.strip()," ", file=outfile)
elif line.startswith("HETNAM") or line.startswith("HETSYN") or line.startswith("FORMUL"):
outfile.write(line)
else:
print(line.strip(), file=outfile)
infile.close()
outfile.close()
#----- End adjustment -----
#----- Remove H from Phosphate OH -----
#The default het dict contains some hydrogens that are not present at
# physiological conditions. These hydrogens are usually present to make the
# ligands charge-neutral.
#The most prevalent of these is the H on phosphate OH.
#Here we comment out those hydrogens so Reduce will not add them.
#We also adjust SPD, SPM, and PAR nitrogens to have appropriate charge states
import re
class record():
def __init__(self):
self.lines = []
self.has_O = False
self.has_P = False
def addline(self, line):
self.lines.append(line)
def output_record(self,outfile):
for line in self.lines:
outfile.write(line)
outfile.write("\n")
def remove_OH_on_P(self):
line_index = 0
hydrogens_to_remove = []
while line_index < len(self.lines):
line = self.lines[line_index]
if line.startswith("CONECT"):
parent_atom = line[11:15].strip()
number_atoms = line[16:20].strip()
connected_atoms = line[20:].split()
if parent_atom in hydrogens_to_remove:
self.lines[line_index] = "xx"+line #assumes hydrogen always comes after oxygen
elif parent_atom.startswith("O") and number_atoms=="2": #need 2 connected atoms
atom_1 = connected_atoms[0].strip()
atom_2 = connected_atoms[1].strip()
if atom_1.startswith("P") and atom_2.startswith("H"):
hydrogens_to_remove.append(atom_2)
#matches pattern for a phosphate oxygen, need to comment out the attached hydrogen
line_index += 1
def fix_spd_charge(self):
line_index = 0
while line_index < len(self.lines):
line = self.lines[line_index]
if line.startswith("CONECT N1 "):
self.lines[line_index] = "CONECT N1 4 C2 HN11 HN12 HN13\n"
elif line.startswith("CONECT N6 "):
self.lines[line_index] = "CONECT N6 4 C5 C7 HN61 HN62\n"
elif line.startswith("CONECT N10 "):
self.lines[line_index] = "CONECT N10 4 C9 H101 H102 H103\n"
elif line.startswith("CONECT HN12"):
self.lines[line_index] = "CONECT HN12 1 N1\nCONECT NH13 1 N1\n"
elif line.startswith("CONECT HN6 "):
self.lines[line_index] = "CONECT HN61 1 N6\nCONECT HN62 1 N6\n"
elif line.startswith("CONECT H102 1 N10"):
self.lines[line_index] = "CONECT H102 1 N10\nCONECT H103 1 N10\n"
line_index += 1
def fix_spm_charge(self):
line_index = 0
while line_index < len(self.lines):
line = self.lines[line_index]
if line.startswith("CONECT N1 "):
self.lines[line_index] = "CONECT N1 4 C2 HN11 HN12 HN13\n"
elif line.startswith("CONECT N5 "):
self.lines[line_index] = "CONECT N5 4 C4 C6 HN51 HN52\n"
elif line.startswith("CONECT N10"):
#HN0 -> H101
self.lines[line_index] = "CONECT N10 4 C9 C11 H101 H102\n"
elif line.startswith("CONECT N14"):
self.lines[line_index] = "CONECT N14 4 C13 HN41 HN42 HN43\n"
elif line.startswith("CONECT HN12"):
self.lines[line_index] = "CONECT HN12 1 N1\nCONECT NH13 1 N1\n"
elif line.startswith("CONECT HN5"):
self.lines[line_index] = "CONECT HN51 1 N5\nCONECT HN52 1 N5\n"
elif line.startswith("CONECT HN0"):
#HN0 -> H101
self.lines[line_index] = "CONECT H101 1 N10\nCONECT H102 1 N10\n"
elif line.startswith("CONECT HN42"):
self.lines[line_index] = "CONECT HN42 1 N14\nCONECT HN43 1 N14\n"
line_index += 1
def fix_par_charge(self):
line_index = 0
while line_index < len(self.lines):
line = self.lines[line_index]
if line.startswith("CONECT N21"):
self.lines[line_index] = "CONECT N21 4 C21 HN21 HN22 HN23\n"
elif line.startswith("CONECT N12"):
self.lines[line_index] = "CONECT N12 4 C12 H121 H122 H123\n"
elif line.startswith("CONECT N32"):
self.lines[line_index] = "CONECT N32 4 C32 H321 H322 H323\n"
elif line.startswith("CONECT N24"):
self.lines[line_index] = "CONECT N24 4 C24 H241 H242 H243\n"
elif line.startswith("CONECT N64"):
self.lines[line_index] = "CONECT N64 4 C64 HN61 HN62 HN63\n"
elif line.startswith("CONECT HN22"):
self.lines[line_index] = "CONECT HN22 1 N21\nCONECT HN23 1 N21\n"
elif line.startswith("CONECT H122"):
self.lines[line_index] = "CONECT H122 1 N12\nCONECT H123 1 N12\n"
elif line.startswith("CONECT H322"):
self.lines[line_index] = "CONECT H322 1 N32\nCONECT H323 1 N32\n"
elif line.startswith("CONECT H242"):
self.lines[line_index] = "CONECT H242 1 N24\nCONECT H243 1 N24\n"
elif line.startswith("CONECT HN62"):
self.lines[line_index] = "CONECT HN62 1 N64\nCONECT HN63 1 N64\n"
line_index += 1
def process(self, formul_line, outfile):
phosphate_pattern = re.compile('(FORMUL)(.........)(.*H[1-9])(.*O[1-9])(.*P[1-9])')
if phosphate_pattern.match(formul_line):
self.remove_OH_on_P()
if self.lines[0].startswith("RESIDUE SPD"):
self.fix_spd_charge()
elif self.lines[0].startswith("RESIDUE SPM"):
self.fix_spm_charge()
elif self.lines[0].startswith("RESIDUE PAR"):
self.fix_par_charge()
self.output_record(outfile)
infile = open("reduce_wwPDB_het_dict_adjusted.txt")
outfile = open("reduce_wwPDB_het_dict_no_poh.txt","w")
print("Adjusting charges", file=sys.stderr)
residue_line_pattern = re.compile('(RESIDUE)(...)(?P<resname>...)')
formula_line_pattern = re.compile('FORMUL')
for line in infile:
if residue_line_pattern.match(line):
#resname = residue_line_pattern.match(line).group('resname')
rec = record()
rec.addline(line)
elif formula_line_pattern.match(line):
rec.addline(line)
rec.process(line, outfile)
else:
rec.addline(line)
infile.close()
outfile.close()
#----- End remove H from POH -----
#----- Regularized endlines for Windows -----
#Swap newline characters for Windows-compatible ones to ensure usability on Win
infile = open("reduce_wwPDB_het_dict_no_poh.txt")
outfile = open("reduce_wwPDB_het_dict_endlines.txt","w")
print("Switching to Windows endlines", file=sys.stderr)
lines = infile.readlines()
for line in lines:
line=line.replace("\n","")
outfile.write("%s\r\n" % line)
infile.close()
outfile.close()
#----- End regularize endlines -----
#----- Rename and remove files -----
#The default path Reduce uses to find the het dict file can be checked by
# invoking reduce -h and looking under the -DB flag.
#Generally, Reduce is looking for a file named reduce_wwPDB_het_dict.txt.
#Renaming the updated file is renamed to match that name allows it to be used
# automatically in most circumstances.
#The previous file is renamed with a datestamp.
print("File cleanup", file=sys.stderr)
existing_files = os.listdir(".")
if "reduce_wwPDB_het_dict.txt" in existing_files:
print(" The previous het dict was renamed to reduce_wwPDB_het_dict_obsoleted_"+fetchtime+".txt", file=sys.stderr)
os.rename("reduce_wwPDB_het_dict.txt","reduce_wwPDB_het_dict_obsoleted_"+fetchtime+".txt")
os.rename("reduce_wwPDB_het_dict_endlines.txt","reduce_wwPDB_het_dict.txt")
os.remove("reduce_wwPDB_het_dict_download.txt")
os.remove("reduce_wwPDB_het_dict_adjusted.txt")
os.remove("reduce_wwPDB_het_dict_no_poh.txt")
#----- End rename and remove -----