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Hello Indra--

>  I am trying to add MTSL paramagnetic probe in a membrane protein
>  using xplor. 
>  I  modified the addAtoms.py file with  my protein sequence and my
>  original structure (start.pdb) at proper places. I used CYSP as the
>  MTSL probe at the desired position (as suggested in the tutorials) in
>  the protein sequence. When I executed the command "xplor -py
>  addAtoms.py" , it seems working and new.pdb and new.psf files are
>  generated with MTSL labeled at proper position in the protein
>  sequence. When I compare the new.pdb with start.pdb, it seems that
>  the structure is distorted (alpha helix to random coil).

Of course, this should not happen. Are there any diagnostic messages?

>  I used
>  cysp.top and cysp.par as topology and parameter files. 

CYSP is now included in the standard toppar input, so these additional
files should cause errors (with recent versions of Xplor-NIH).

So there must be some error messages...

best regards--
Charles

- -- 
Charles Schwieters     email:   Charles at Schwieters.org
                       www:     http://schwieters.org/cds
phone: (301) 402-4914  PGP key: http://schwieters.org/cds/pgp.txt

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