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[ccp4bb]: SUMMARY: Sequence homology in B-factor column
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The original question was how to do sequence comparison with a PDB file and
output the residue homologies in the B-factors column in the PDB file.
Thanks for all your responses. Here I summarize all the answers I get.
A. Bostjan Kobe & Douglas Theobald:
Use "ConSurf" (http://consurf.tau.ac.il/)
B. Daniel John Rigden & Alex Pautsch:
Use "ESPript" (http://prodes.toulouse.inra.fr/ESPript/)
C. Dennis Madsen & Gerard Kleywegt:
Use "Indonesia" (http://xray.bmc.uu.se/~dennis/)
After having installed indonesia:
1) Create a sequence alignment with the protein structure as the _first_
(you can load PDB files directly as a "sequence type" - it will extract the
from the SEQRES or ATOM cards depending on what is available).
2) Save the sequence alignment in "ODAT format" - choose "save as" in
alignment editor window and
give the file the suffix "odat" and type "ODAT".
3) Save the perl script that I have attached to this mail and do "chmod a+x
4) Use the perl script to insert the diversity at the b-factor's place:
./bfactor.pl -pdb mypdbfile.pdb -odat myodatfile.odat > newpdbfile.pdb
The file "newpdbfile.pdb" will have the information you want.
D. Also from Gerard Kleywegt:
if you have the sequence alignment already, you can also use the low-tech
approach of SOD (http://xray.bmc.uu.se/usf/sod_man.html - use task MULT) -
this will give you several O datablocks etc. to colour your CA trace by
of sequence conservation or variability
E. Rob Meijers:
a quick'n dirty way, when you have a pdb file and an alignment in
clustalx aln format, is to go to:
choose the option: h2pdb, upload your files, and you'll get either an email
or a downloadable PDB file with the B factor modified according to
variability, based on
I think with Whatif you can get a MAXHOM score (use the PHD/predict
protein server to get this) in the B-factor column. If it is not an
official option ask Gert Vriend about it, they have made it in the past.
We used to do it with a one line awk script ourselves (Tong et al, JBC,
1997, 272, 21381-21387.)
Yu Wai CHEN, Ph.D. .................. email:email@example.com
Centre for Protein Engineering, tel:+44-(0)1223-402148
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