Propka

Acknowledgement

The PROPKA method is developed by the Jensen Research Group , Department of Chemistry, University of Copenhagen.

propka.py contact and relies on the result from the propka server

Introduction

This script can fetch the pka values for a protein from the propka server. The "propka" function downloads the results and processes them.
It also automatically writes a pymol command file and let pymol execute it. This command file make pka atoms, rename them, label them and color them according to the pka value.

If is not possible to get the mechanize module to work, one can go to the propka server, upload a .pdb file, and download the .pka file.
By setting: "method=file" and point to the .pka file "file_name=.\Results_propka\4ins_.pka", one can process the .pka result file and get the pymol command file.

The last possibility, is just to ask for the pka values of a recognized PDB id. This is done with the "getpropka" function.

Dependency of python module: mechanize

The script needs mechanize to run.

On windows, it is not easy to make additional modules available for pymol. So put in into your working folder.
The easy manual way:

Go to: http://wwwsearch.sourceforge.net/mechanize/download.html
Download mechanize-0.2.5.zip. http://pypi.python.org/packages/source/m/mechanize/mechanize-0.2.5.zip
Extract to .\mechanize-0.2.5 then move the in-side folder "mechanize" to your folder with propka.py. The rest of .\mechanize-0.2.5 you don't need.

You can also see other places where you could put the "mechanize" folder. Write this in pymol to see the paths where pymol is searching for "mechanize"
import sys; print(sys.path)

Examples

### Point to your directory with the script.
#cd /homes/linnet/Documents/Speciale/5NT-project/Mutant-construct/predict_reactivity/propka
cd C:\Users\tlinnet\Documents\My Dropbox\Speciale\5NT-project\Mutant-construct\predict_reactivity\propka

run ./propka.py
fetch 4ins, async=0
propka molecule=4ins, chain=*, resi=19.20, resn=ASP.TYR, logtime=_, verbose=yes, showresult=no

fetch 1hp1, async=0
propka molecule=1hp1, chain=A, resi=308.513, resn=CYS, logtime=_, verbose=no, showresult=no

getpropka source=ID, PDBID=4ins, logtime=_, server_wait=3.0, verbose=yes, showresult=no

propka used on 4INS.
propka used on 1HP1.
An appending logfile ./Results_propka/_Results.log saves the input commands and the result for the residues specified with resi= and resn=

pka atoms are created and renamed for their pka value. That makes it easy to "click" the atom in pymol and instantly see the pka value.

The atoms b value are also altered to the pka value, and the atoms are then spectrum colored from pka=0-14.

The pka value of 99.9 represent a di-sulphide bond, and is colored gold and the sphere size is set a little bigger.

If one wants to see the specified result, the logfile ./Results_propka/_Results.log saves the link to the propka server. Here one can see in an interactive Jmol appp, the interactions to the pka residues.

Example Pymol Script

### Point to your directory with the script.
#cd /homes/linnet/Documents/Speciale/5NT-project/Mutant-construct/predict_reactivity/propka
cd C:\Users\tlinnet\Documents\My Dropbox\Speciale\5NT-project\Mutant-construct\predict_reactivity\propka

run ./propka.py

### Fetch 4ins from web. async make sure, we wait to have completed
fetch 4ins, async=0
propka molecule=4ins, chain=*, resi=19.20, resn=ASP.TYR, logtime=_, verbose=yes, showresult=no

### If there is problems to get the mechanize module working, get the result .pka file at the propka webpage manually.
### Then run with method=file and point to .pka file.
#fetch 4ins, async=0
#hide everything, 4ins
#show cartoon, 4ins
#propka method=file, molecule=4ins, resi=18.25-30, resn=cys, file_name=.\Results_propka\4ins_.pka

### Some more examples. This molecule has 550 residues, so takes a longer time.
#fetch 1hp1, async=0
#propka molecule=1hp1, chain=A, resi=308.513, resn=CYS, logtime=_, verbose=no, showresult=no

### One can also just make a lookup for a protein. Use function: getpropka
### Note. This does only print the result to the pymol command line
#getpropka source=ID, PDBID=4ake, logtime=_, server_wait=3.0, verbose=no, showresult=yes
#getpropka source=ID, PDBID=4ins, logtime=_, server_wait=3.0, verbose=yes, showresult=no

Input paramaters

# method : method=upload is default. This sends .pdb file and request result from propka server. 
## method=file will only process a manual .pka file, and write a pymol command file. No use of mechanize.
# molecule : name of the molecule. Ending of file is assumed to be .pdb
# chain : which chains are saved to file, before molecule file is send to server. Separate with "." Ex: chain=A.b
# resi : Select by residue number, which residues should be printed to screen and saved to the log file: \Results_propka\_Results.log. 
## Separate with "." or make ranges with "-". Ex: resi=35.40-50
# resn : Select by residue name, which residues should be printed to screen and saved to the log file: \Results_propka\_Results.log. 
## Separate with "." Ex: resn=cys.tyr
# logtime : Each execution give a set of files with the job id=logtime. If logtime is not provided, the current time is used. 
## Normal it usefull to set it empty. Ex: logtime=_
# verbose : Verbose is switch, to turn on messages for the mechanize section. This is handsome to see how mechanize works, and for error searching.
# showresult : Switch, to turn on all results in pymol command window. Ex: showresult=yes
# file_name: only used for: propka method=file  . Write the path to .pka file
# server_wait=10.0 is default. This defines how long time between asking the server for a result. Set no lower than 3 seconds.
# version=v3.1 is default. This is what version of propka which would be used. 
## Possible: 'v3.1','v3.0','v2.0'. If a newer version is available than the current v3.1, a error message is raised to make user update the script.
# source : source=upload is default and is set at the propka webpage. Can only be used for in the function "getpropka".
# getpropka source=ID, PDBID=4ake , one can print to the command line, the pka value for any official pdb ID. No files are displayed in pymol.

Python Code

#-------------------------------------------------------------------------------
# Name:		propka for pymol
# Purpose:	To fetch and display the pka values for protein of intetest
#
# Author:	Troels E. Linnet
#
# Created:	14/08/2011
# Copyright:	(c) Troels E. Linnet 2011
# Contact:      tlinnet snabela gmail dot com
# Licence:	Free for all
#-------------------------------------------------------------------------------
"""
	    The PROPKA method is developed by the
		  Jensen Research Group
		 Department of Chemistry
		University of Copenhagen

	Please cite these references in publications:
Hui Li, Andrew D. Robertson, and Jan H. Jensen
"Very Fast Empirical Prediction and Interpretation of Protein pKa Values"
Proteins, 2005, 61, 704-721.

Delphine C. Bas, David M. Rogers, and Jan H. Jensen
"Very Fast Prediction and Rationalization of pKa Values for Protein-Ligand Complexes"
Proteins, 2008, 73, 765-783.

Mats H.M. Olsson, Chresten R. Soendergard, Michal Rostkowski, and Jan H. Jensen
"PROPKA3: Consistent Treatment of Internal and Surface Residues in Empirical pKa predictions"
Journal of Chemical Theory and Computation, 2011 7 (2), 525-537

Chresten R. Soendergaard, Mats H.M. Olsson, Michaz Rostkowski, and Jan H. Jensen
"Improved Treatment of Ligands and Coupling Effects in Empirical Calculation and Rationalization of pKa Values"
Journal of Chemical Theory and Computation, 2011 in press
"""
#-------------------------------------------------------------------------------
# The script needs mechanize to run.
# On windows, it is not easy to make additional modules available for pymol. So put in into your working folder.
#1)The easy manual way:
#a)Go to: http://wwwsearch.sourceforge.net/mechanize/download.html
#b)Download mechanize-0.2.5.zip. http://pypi.python.org/packages/source/m/mechanize/mechanize-0.2.5.zip
#c)Extract to .\mechanize-0.2.5  then move the in-side folder "mechanize" to your folder with propka.py. The rest of .\mechanize-0.2.5 you don't need.
#You can also see other places where you could put the "mechanize" folder. Write this in pymol to see the paths where pymol is searching for "mechanize"
# import sys; print(sys.path)

#-------------------------------------------------------------------------------
"""
Example for pymol script to start the functions. For example: trypropka.pml
Execute with pymol or start pymol and: File->Run->trypropka.pml
##############################################################################################################################################################################################################################

### Point to your directory with the script.
#cd /homes/linnet/Documents/Speciale/5NT-project/Mutant-construct/predict_reactivity/propka
cd C:\Users\tlinnet\Documents\My Dropbox\Speciale\5NT-project\Mutant-construct\predict_reactivity\propka

run ./propka.py

### Fetch 4ins from web. async make sure, we wait to have completed
fetch 4ins, async=0
propka molecule=4ins, chain=*, resi=19.20, resn=ASP.TYR, logtime=_, verbose=yes, showresult=no

### If there is problems to get the mechanize module working, get the result .pka file at the propka webpage manually.
### Then run with method=file and point to .pka file.
#fetch 4ins, async=0
#hide everything, 4ins
#show cartoon, 4ins
#propka method=file, molecule=4ins, resi=18.25-30, resn=cys, file_name=.\Results_propka\4ins_.pka

### Some more examples. This molecule has 550 residues, so takes a longer time.
#fetch 1hp1, async=0
#propka molecule=1hp1, chain=A, resi=308.513, resn=CYS, logtime=_, verbose=no, showresult=no

### One can also just make a lookup for a protein. Use function: getpropka
### Note. This does only print the result to the pymol command line
#getpropka source=ID, PDBID=4ake, logtime=_, server_wait=3.0, verbose=no, showresult=yes
#getpropka source=ID, PDBID=4ins, logtime=_, server_wait=3.0, verbose=yes, showresult=no

#########input paramaters#########
# method : method=upload is default. This sends .pdb file and request result from propka server.
## method=file will only process a manual .pka file, and write a pymol command file. No use of mechanize.
# molecule : name of the molecule. Ending of file is assumed to be .pdb
# chain : which chains are saved to file, before molecule file is send to server. Separate with "." Ex: chain=A.b
# resi : Select by residue number, which residues should be printed to screen and saved to the log file: \Results_propka\_Results.log.
## Separate with "." or make ranges with "-". Ex: resi=35.40-50
# resn : Select by residue name, which residues should be printed to screen and saved to the log file: \Results_propka\_Results.log.
## Separate with "." Ex: resn=cys.tyr
# logtime : Each execution give a set of files with the job id=logtime. If logtime is not provided, the current time is used.
## Normal it usefull to set it empty. Ex: logtime=_
# verbose : Verbose is switch, to turn on messages for the mechanize section. This is handsome to see how mechanize works, and for error searching.
# showresult : Switch, to turn on all results in pymol command window. Ex: showresult=yes
# file_name: only used for: propka method=file  . Write the path to .pka file
# server_wait=10.0 is default. This defines how long time between asking the server for a result. Set no lower than 3 seconds.
# version=v3.1 is default. This is what version of propka which would be used.
## Possible: 'v3.1','v3.0','v2.0'. If a newer version is available than the current v3.1, a error message is raised to make user update the script.
# source : source=upload is default and is set at the propka webpage. Can only be used for in the function "getpropka".
# getpropka source=ID, PDBID=4ake , one can print to the command line, the pka value for any official pdb ID. No files are displayed in pymol.

##############################################################################################################################################################################################################################

"""

try: from pymol import cmd; runningpymol='yes'
except: runningpymol='no'; pass
import time, platform, os

def propka(method="upload",molecule="NIL",chain="*",resi="0",resn="NIL",logtime=time.strftime("%Y%m%d%H%M%S",time.localtime()),server_wait=10.0,version="v3.1",verbose="no",showresult="no",file_name="NIL"):
	### First we have to be sure, we give reasonable arguments
	assert method in ['upload', 'file'], "'method' has to be either: method=upload or method=file"
	assert molecule not in ['NIL'], "You always have to provide molecule name. Example: molecule=4ins"
	### To print out to screen for selected residues. Can be separated with "." or make ranges with "-". Example: resi="4-8.10"
	if resi != "0": resi_range = ResiRange(resi)
	else: resi_range=resi
	### Also works for residue names. They are all converted to bigger letters. Example: resn="cys.Tyr"
	if resn != "NIL": resn_range = ResnRange(resn); resn_range = [resn.upper() for resn in resn_range]
	else: resn_range = resn
	### Make chain range, and upper case.
	chain = ChainRange(chain)
	### Make result directory. We also the absolut path to the new directory.
	Newdir = createdirs()
	if method=="upload":
		### We try to load mechanize. If this fail, one can always get the .pka file manual and the run: method=file
		try: import mechanize; importedmechanize='yes'
		except ImportError: print("Import error. Is a module missing?"); print(sys.exc_info()); print("Look if missing module is in your python path\n%s")%sys.path;importedmechanize='no'; import mechanize
		### The name for the new molecule
		newmolecule = "%s%s"%(molecule,logtime)
		### Create the new molecule from original loaded and for the specified chains. Save it, and disable the old molecule.
		cmd.create("%s"%newmolecule, "%s and chain %s"%(molecule,chain))
		cmd.save("%s%s.pdb"%(Newdir,newmolecule), "%s"%newmolecule)
		cmd.disable("%s"%molecule)
		### Let the new molecule be shown in cartoon.
		cmd.hide("everything", "%s"%newmolecule)
		cmd.show("cartoon", "%s"%newmolecule)
		### Make the absolut path to the newly created .pdb file.
		PDB="%s%s.pdb"%(Newdir,newmolecule);source="upload"; PDBID=""
		### Request server, and get the absolut path to the result file.
		file_name = getpropka(source,PDB,chain,resi,resn,PDBID,logtime,server_wait,version,verbose,showresult)
		### Open the result file and put in into a handy list.
		list_results = importpropkaresult(file_name)
	if method=="file":
		assert file_name not in ['NIL'], "You have to provide path to file. Example: file_name=./Results_propka/4ins_2011.pka"
		assert ".pka" in file_name, 'The propka result file should end with ".pka" \nExample: file_name=./Results_propka/4ins_2011.pka \nfilename_name=%s'%(file_name)
		### The name for the molecule we pass to the writing script of pymol commands
		newmolecule = "%s"%molecule
		### We open the result file we have got in the manual way and put in into a handy list.
		list_results = importpropkaresult(file_name)
	### Now create the pymol command file. This should label the protein. We get back the absolut path to the file, so we can execute it.
	result_pka_pymol_name = writepymolcmd(newmolecule,file_name)
	### Now run our command file.
	cmd.do("@%s"%result_pka_pymol_name)
	### Then we print the interesting residues to the screen.
	printpropkaresult(list_results, resi, resi_range, resn, resn_range, showresult)
if runningpymol !='no': cmd.extend("propka",propka)

def getpropka(source="upload",PDB="NIL",chain="*",resi="0",resn="NIL",PDBID="",logtime=time.strftime("%Y%m%d%H%M%S",time.localtime()),server_wait=10.0,version="v3.1",verbose="no",showresult="no"):
	try: import mechanize; importedmechanize='yes'
	except ImportError: print("Import error. Is a module missing?"); print(sys.exc_info()); print("Look if missing module is in your python path \n %s"%sys.path);importedmechanize='no'

	url = "http://propka.ki.ku.dk/"
	assert version in ['v2.0', 'v3.0', 'v3.1'], "'version' has to be either: 'v2.0', 'v3.0', 'v3.1'"
	propka_v_201108 = 3.1
	assert source in ['ID', 'upload', 'addr', 'input_file'], "'source' has to be either: 'ID', 'upload', 'addr', 'input_file'"
	if source=="upload": assert PDB not in ['NIL'], "You always have to provide PDB path. Example: PDB=.\Results_propka\4ins2011.pdb"
	if source=="ID": assert len(PDBID)==4 , "PDBID has to be 4 characters"
	### To print out to screen for selected residues. Can be separated with "." or make ranges with "-". Example: resi="4-8.10"
	if resi != "0": resi_range = ResiRange(resi)
	else: resi_range=resi
	### Also works for residue names. They are all converted to bigger letters. Example: resn="cys.Tyr"
	if resn != "NIL": resn_range = ResnRange(resn); resn_range = [resn.upper() for resn in resn_range]
	else: resn_range = resn
	### Start the browser
	br = mechanize.Browser()
	### We pass to the server, that we are not a browser, but this python script. Can be used for statistics at the propka server.
	br.addheaders = [('User-agent', 'pythonMechanizeClient')]
	### To turn on debugging messages
	#br.set_debug_http(True)
	### To open the start page.
	page_start = br.open(url)
	read_start = page_start.read()
	if verbose == 'yes': print(br.title()); print(br.geturl())
	### To get available forms
	page_forms = [f.name for f in br.forms()]
	if verbose == 'yes': print(page_forms)
	### Select first form
	br.select_form(name=page_forms[0])
	### Print the parameters of the 'version' RadioControl button and current value
	if verbose == 'yes': print(br.find_control(name='version')), br.find_control(name='version').value
	### This is to check, that the current script is "up-to-date".
        propka_v_present = float(br.find_control(name='version').value[0].replace('v',''))
        if propka_v_present > propka_v_201108:
 		raise UserWarning('\nNew version of propka exist.\nCheck/Update your script.\nPresent:v%s > Script:v%s'%(propka_v_present,propka_v_201108))
	### Change the parameters of the 'version' radio button and then reprint the new value. Input has to be in a list [input].
	br.form['version'] = [version]
	if verbose == 'yes': print(br.find_control(name='version').value)
	### Print the parameters of the 'source' RadioControl button and current value
	if verbose == 'yes': print(br.find_control(name='source'), br.find_control(name='source').value)
	### Change the parameters of the 'source' radio button and then reprint the new value. Input has to be in a list [input].
	br.form['source'] = [source]
	if verbose == 'yes': print(br.find_control(name='source').value)
	### This step was the must strange and took a long time. For finding the information and the double negative way.
	### One have to enable the pdb button. Read more here: http://wwwsearch.sourceforge.net/old/ClientForm/   ("# All Controls may be disabled.....)
	PDBID_control = br.find_control("PDBID")
	PDB_control = br.find_control("PDB")
	if verbose == 'yes': print(PDBID_control.disabled, PDB_control.disabled)
	if source == "ID": PDBID_control.disabled=False; PDB_control.disabled=True
	if source == "upload": PDBID_control.disabled=True; PDB_control.disabled=False
	if verbose == 'yes': print(PDBID_control.disabled, PDB_control.disabled)
	### We create the result dir, and take with us the 'path' to the result dir.
	Newdir = createdirs()
	### Open all the files, and assign them.
	if source == "upload": filename = PDB
	if source == "ID": filename = PDBID
	files = openfiles(Newdir, filename, logtime, source)
	result_pka_file=files[0];result_input_pka_file=files[1];result_log=files[2];filepath=files[3];result_pka_file_name=files[4];result_pka_file_stripped=files[5]
	## Print the parameters of the 'PDBID' TextControl button and current value
	if source == "ID" and verbose == 'yes': print(br.find_control(name='PDBID')); print(br.find_control(name='PDBID').value)
	## Change the parameters of the 'PDBID' TextControl and then reprint the new value. Input has just to be a string.
	if source == "ID": br.form["PDBID"] = PDBID
	if source == "ID" and verbose == 'yes': print(br.find_control(name='PDBID').value)
	## Print the parameters of the 'PDB' TextControl button and current value
	if source == "upload" and verbose == 'yes': print(br.find_control(name='PDB')); print(br.find_control(name='PDB').value)
	## Change the parameters of the 'PDB' FileControl and then reprint the new value. Input has just to be a string.
	if source == "upload": PDBfilename=PDB; PDBfilenamepath=PDB
	if source == "upload": br.form.add_file(open(PDBfilename), 'text/plain', PDBfilenamepath, name='PDB')
	if source == "upload" and verbose == 'yes': print(br.find_control(name='PDB')); print(br.find_control(name='PDB').value)
	## Now reprint the current selected form, so we see that we have the right values.
	if verbose == 'yes': print(br.form)
	### Make "how" we would like the next request. We would like to "Click the submit button", but we have not opened the request yet.
	req = br.click(type="submit", nr=0)
	### Have to pass by a mechanize exception. Thats the reason for the why True
	### The error was due to: br.open(req)
	###### mechanize._response.httperror_seek_wrapper: HTTP Error refresh: The HTTP server returned a redirect error that would lead to an infinite loop.
	###### The last 30x error message was:
	###### OK
	### I haven't been able to find the refresh problem or extend the time. So we make a pass on the raised exception.
	try:
		print("Now sending request to server")
		br.open(req)
	### If there is raised an exception, we jump through to the result page after some sleep.
        except mechanize.HTTPError:
		### We can extract the jobid from the current browser url.
		jobid = br.geturl()[32:-5]
		### We notice how the script at the server presents the final result page.
		url_result = url + "pka/" + jobid + ".html"
		### Now we continue to try to find the result page, until we have succes. If page doesn't exist, we wait a little.
		while True:
			print("Result still not there. Waiting %s seconds more"%server_wait)
			time.sleep(float(server_wait))
			### To pass the "break" after the exception, we make a hack, wait and then go to the result page, which is the jobid.
			try:
				page_result = br.open(url_result)
				read_result = page_result.read()
				### If we don't receive a error in getting the result page, we break out of the while loop.
				break
			### If the page doesn't exist yet. We go back in the while loop.
			except mechanize.HTTPError:
				### Wait another round
				pass
			### If we get a timeout, we also wait.
			except mechanize.URLError:
				### Wait another round
				pass
	htmlresult="The detailed result is now available at: %s"%br.geturl()
	print(htmlresult)
	read_result = br.response().read()
	## Now save the available links from the current page. But only links that satisfy the expression.
	links_result = []
	for l in br.links(url_regex='http://propka.ki.ku.dk/pka'):
		links_result.append(l)
	### Now follow the link to the .propka_input resultpage
	if len(links_result) > 1: br.follow_link(links_result[1])
	### Now get the page text for the current link
	if len(links_result) > 1: read_result1 = br.response().read()
	### Save the result
	if len(links_result) > 1: result_input_pka_file.write(read_result1)
	### Now follow the link to the .pka resultpage
	if len(links_result) > 1: br.back()
	result_input_pka_file.close()
	### Now follow first link. "Should be" available for all versions of propka.
	br.follow_link(links_result[0])
	### Now get the page for the current link
	read_result0 = br.response().read()
	### Save the result and close file.
	result_pka_file.write(read_result0)
	result_pka_file.close()
	### Now get the result in a list, which is sorted
	list_results = importpropkaresult(result_pka_file_name)
	### Print to log file
	result_log.write("# executed: %s \n# logtime: %s \n# source=%s \n# PDB=%s \n# chain=%s \n# PDBID=%s \n# server_wait=%s version=%s verbose=%s showresult=%s \n# resi=%s resn=%s\n# %s \n"%(time.strftime("%Y%m%d%H%M%S",time.localtime()),logtime,source,PDB,chain,PDBID,server_wait,version,verbose,showresult,resi,resn,htmlresult))
	### Print to screen
	printpropkaresult(list_results, resi, resi_range, resn, resn_range, showresult)
	### Now write to log
	for l in list_results:
		if resi != "0" and int(l[1]) in resi_range:
			result_log.write("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]) + '\n')
		if resn != "NIL" and l[0] in resn_range and int(l[1]) not in resi_range:
			result_log.write("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]) + '\n')
		result_pka_file_stripped.write("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]) + '\n')
	result_pka_file_stripped.close()
	result_log.close()
	return(result_pka_file_name)
if runningpymol !='no': cmd.extend("getpropka",getpropka)

def writepymolcmd(newmolecule,file_name):
	list_results = importpropkaresult(file_name)
	files_pka_pymol = openpymolfiles(file_name)
	result_pka_pymol=files_pka_pymol[0];result_pka_pymol_name=files_pka_pymol[1]
	dictio = {'ASP':'CG', 'GLU':'CD', 'ARG':'CZ', 'LYS':'NZ', 'HIS':'CG', 'CYS':'SG', 'TYR':'OH', 'C-':'C', 'N+':'N'}
	### Now start write to the file.
	pkamolecule="pka%s"%(newmolecule)
	### Try to make silent, and not auto zoom the new objects
	result_pka_pymol.write("feedback disable,all,actions\n")
	result_pka_pymol.write("feedback disable,all,results\n")
	result_pka_pymol.write("set auto_zoom, off\n")
	### Create a new empty pymol pka molecule
	result_pka_pymol.write("cmd.create('%s','None')\n"%(pkamolecule))
	for l in list_results:
		name=dictio[l[0]];resi=l[1];chain=l[2];pka=l[3];buried=l[4]
		if "*" in pka: pka = pka.replace("*",""); comment="*:Coupled residues detected"
		else: comment=""
		### Make the selection for which atom to copy
		newselection = ("%s and chain %s and resi %s and name %s"%(newmolecule,chain,resi,name))
		### Copy the atom, call it by the residue name
		result_pka_pymol.write("cmd.create('%s','%s',quiet=1)\n"%(resi,newselection))
		### Alter the name and the b value of the newly created atom
		result_pka_pymol.write("cmd.alter('%s','b=%s')\n"%(resi,pka))
		result_pka_pymol.write("cmd.alter('%s','vdw=0.5')\n"%(resi))
		result_pka_pymol.write("cmd.alter('%s','name=%s%s%s')\n"%(resi,'"',pka,'"'))
		createselection = ("%s and chain %s and resi %s"%(resi,chain,resi))
		result_pka_pymol.write("cmd.create('%s','%s or (%s)',quiet=1)\n"%(pkamolecule,pkamolecule,createselection))
		### Remove the temporary atoms
		result_pka_pymol.write("cmd.remove('%s')\n"%(resi))
		### Delete the temporary molecule/selection
		result_pka_pymol.write("cmd.delete('%s')\n"%(resi))

	result_pka_pymol.write("cmd.show('spheres','%s')\n"%(pkamolecule))
	result_pka_pymol.write("cmd.spectrum('b','rainbow',selection='%s',minimum='0',maximum='14')\n"%(pkamolecule))
	result_pka_pymol.write("cmd.alter('name 99.9','vdw=0.8')\n")
	result_pka_pymol.write("cmd.show('spheres','name 99.9')\n")
	result_pka_pymol.write("cmd.color('sulfur','name 99.9')\n")
	result_pka_pymol.write("set auto_zoom, on\n")
	result_pka_pymol.write("feedback enable,all,actions\n")
	result_pka_pymol.write("feedback enable,all,results\n")
	result_pka_pymol.close()
	return(result_pka_pymol_name)

def openpymolfiles(file_name):
	result_pka_pymol_name = file_name.replace(".pka",".pml")
	result_pka_pymol = open(result_pka_pymol_name, "w")
	return(result_pka_pymol, result_pka_pymol_name)

def printpropkaresult(list_results, resi, resi_range, resn, resn_range, showresult):
	for l in list_results:
		if resi != "0" and int(l[1]) in resi_range:
			if showresult != 'yes': print("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]))
		if resn != "NIL" and l[0] in resn_range and int(l[1]) not in resi_range:
			if showresult != 'yes': print("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]))
		if showresult == 'yes': print("%3s %3s %s %6s %3s %5s %3s %4s %s"%(l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]))

def importpropkaresult(result_pka_file_name):
	result_pka_file = open(result_pka_file_name, "r")
	list_results = []
	for l in result_pka_file:
		if not l.strip():
			continue
		else:
			### To search for the right lines
			if l.strip().split()[0] in ['ASP', 'GLU', 'ARG', 'LYS', 'HIS', 'CYS', 'TYR', 'C-', 'N+'] and len(l.strip().split())>20:
				list_results.append([l.strip().split()[0], l.strip().split()[1], l.strip().split()[2], l.strip().split()[3], l.strip().split()[4], l.strip().split()[6], l.strip().split()[7], l.strip().split()[8], l.strip().split()[9]])
	### Sort the result after the residue number and then chain.
	list_results.sort(key=lambda residue: int(residue[1]))
	list_results.sort(key=lambda chain: chain[2])
	result_pka_file.close()
	return(list_results)

def createdirs():
	if platform.system() == 'Windows': Newdir = os.getcwd()+"\Results_propka\\"
	if platform.system() == 'Linux': Newdir = os.getcwd()+"/Results_propka/"
	if not os.path.exists(Newdir): os.makedirs(Newdir)
	return(Newdir)

def openfiles(Newdir, filename, logtime, source):
	if source == "upload":
		result_pka_file_name = filename.replace(".pdb",".pka")
		result_pka_input_file_name = filename.replace(".pdb",".propka_input")
		result_log_name = "%s_Results.log"%(Newdir)
		result_pka_file_stripped_name = filename.replace(".pdb",".stripped")
	if source == "ID":
		result_pka_file_name = "%s%s%s.pka"%(Newdir,filename,logtime)
		result_pka_input_file_name = "%s%s%s.propka_input"%(Newdir,filename,logtime)
		result_log_name = "%s_Results.log"%(Newdir)
		result_pka_file_stripped_name = "%s%s%s.stripped"%(Newdir,filename,logtime)
	if platform.system() == 'Windows': filepath = "\\"
	if platform.system() == 'Linux': filepath = "/"
	### Open the files
	result_pka_file = open(result_pka_file_name, "w")
	result_input_pka_file = open(result_pka_input_file_name, "w")
	result_log = open(result_log_name, "a")
	result_pka_file_stripped = open(result_pka_file_stripped_name, "w")
	return(result_pka_file, result_input_pka_file, result_log, filepath, result_pka_file_name,result_pka_file_stripped)

def ResiRange(resi):
	resi = resi.split('.')
	resiList = []
	for i in resi:
		if '-' in i:
			tmp = i.split('-')
			resiList.extend(range(int(tmp[0]),int(tmp[-1])+1))
		if '-' not in i:
			resiList.append(int(i))
	return(resiList)

def ResnRange(resn):
	resn = resn.split('.')
	return(resn)

def ChainRange(chain):
	chainstring = chain.replace(".","+").upper()
	return(chainstring)

Propka

Contents

Acknowledgement

Introduction

Dependency of python module: mechanize

Examples

Example Pymol Script

Input paramaters

Python Code

Navigation menu

Propka

Acknowledgement

Introduction

Dependency of python module: mechanize

Examples

Example Pymol Script

Input paramaters

Python Code

Navigation menu

Search