[Chimera-users] BioPython in a Chimera Python script; PDBio?

Eric Pettersen pett at cgl.ucsf.edu
Tue Jan 7 16:08:11 PST 2014

Hi Darrell,
	You're right; due to the way we compile Chimera to maintain compatibility with older systems makes it tough to compile BioPython with newer Macs since it is a bear to get/use the 10.6 SDK on them (I've never gotten that to work).  So though BioPython compiles easily with my source-code installation of Chimera, I run aground on the same rocks you do using the distributed version of Chimera.
	On the other hand, for the task you describe I don't think using BioPython is going to help you any.  With the BioPython I installed, this is the value of the BioPython 'journal' header record for 1gcn:


You can see that you'd have some tricky parsing on your hands anyway!  So if you have to do some parsing anyway you might as well stick with Chimera.
	So here's some code that will parse out the title and DOI from the JRNL records:

from chimera import openModels, Molecule
for m in openModels.list(modelTypes=[Molecule]):
	if hasattr(m, 'pdbHeaders') and 'JRNL' in m.pdbHeaders:
		title = doi = None
		for line in m.pdbHeaders['JRNL']:
			if line[12:16] == "TITL":
				if title:
					title += " " + line[19:].strip()
					title = line[19:].strip()
			if line[12:15] == "DOI":
				if doi:
					doi += " " + line[19:].strip()
					doi = line[19:].strip()
		print m.name, "Title:", title
		print m.name, "DOI:", doi
		print m.name, "has no JRNL header records"

I haven't tested the above code but it should work, modulo a typo or two.


                        Eric Pettersen
                        UCSF Computer Graphics Lab

On Jan 7, 2014, at 11:55 AM, "Hurt, Darrell (NIH/NIAID) [E]" <darrellh at niaid.nih.gov> wrote:

> Hi Chimera friends,
> I've been trying to install BioPython into the Python interpreter embedded within Chimera. I've been following the guidelines posted a couple of years ago:
> http://www.cgl.ucsf.edu/pipermail/chimera-dev/2011/000807.html
> This works up to a point for me. I'm using Mac OS X 10.8.5 with MacPorts installed. I'm trying to install BioPython 1.63:
> http://biopython.org/wiki/Download#Installation_Instructions
> The "build" process starts to work, but gets hung up with the error "xcrun: Error: failed to exec real xcrun. (No such file or directory)". It seems to be referencing "/Developer/SDKs/MacOSX10.6.sdk", which does not exist in recent versions of Xcode. I've been able to install the 10.6 frameworks into both Xcode 4.6.2 and Xcode 5.x, but that still doesn't work. I manually installed the MacOSX10.6.sdk from Xcode 4.2 into the appropriate location, but still no luck.
> I'm using BioPython because I want to pull some information out of the PDB headers. I was able to use PDBio as described in this discussion:
> http://www.cgl.ucsf.edu/pipermail/chimera-users/2007-February/001291.html
> But the "dictionary" entries "keyed by record type" need additional cleanup/parsing before I can use them (which is why I wanted to use BioPython).
> Is this just a case of Apple not building in enough backwards compatibility? Or is it something that Chimera needs to fix?
> Do you have any additional suggestions for me about "PDBio"? The fields I want are the DOI and title information.
> Finally, is there an analogous "EMDBio" for EMDB records?
> Thanks,
> Darrell
> --
> Darrell Hurt, Ph.D.
> Section Head, Computational Biology
> Bioinformatics and Computational Biosciences Branch (BCBB)
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