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Hello Si--

.  I'm a beginner of xplor-nih. I'm trying to calculate the rmsd of the
. structure generated by xplor-nih calculation and published x-ray structure.
. I have tried both the script rmsdplot.inp (in xplor-nih-2.23/tutorial/
. geomanal/) and the script targetRMSD.in (in the xplor-nih-2.23/bin).
. However, every time it reports error when I compare the calculated structure
. and x-ray structure of my protein.
. Before running the program for my own protein, I practiced the example in
. xplor-nih-tutorial-2009/gb1_simple, in which how to get the rmsd between
. calculated structure and x-ray structure is shown.
. I found the g-xray.pdb file here has exactly the same atom definitions with
. the calculated structure files in precalc/.

>        All the published x-ray pdb files of my protein defines less atoms
> (They do not have Hs) in each residue than the xplor-nih generated pdb
> files. But, I think we chose C, CA and N for the comparison, so the program
> should not read other atoms like Hs.  But it always shows error when reading
> the pdb file. Should I make these two pdb files include the same amount of
> atoms for each residue? Or how can I modified the script targetRMSD.in to
> make it work?
> 

You can use targetRMSD as is to compare PDBs with different numbers of
atoms if you specify the -diffSeq flag. In that case, only the number
(and order) of atoms specified by the -selection option need be the
same.  

Also, the most recent version of Xplor-NIH is 2.26, you may have better
results if you upgrade.

best regards--
Charles
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