If you have a PSF file for the monomer, it's easy to create one for  
the dimer using the "classic"
xplor interface.  Try this:

struct @monomer.psf end
vector do (segid = "A") (all)
struct @monomer.psf end
vector do (segid = "B") (not segid A)
write struct output = "dimer.psf" end
stop

--JK

On Feb 3, 2006, at 1:54 PM, wzhang14 wrote:

> Dear all:
>
> Sorry to both you with a basic question, I am new to xplor.
> I am trying to build protein structure with some NMR restraints.  
> the tutorial
> is very clear and works fine for regular proteins. while when I try to
> generate the psf file for dimers, I can only get the PSF file with  
> one chain
> which causes problems later when applying NMR restrains that  
> requires seond
> chain informations. I tried the manul but couldn't figure out a  
> easy way. Any
> suggests? Your help is greatly appreciated!
>
>
> Wei Zhang
> BCMB
> University of Tennessee
>
>
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> Xplor-nih mailing list
> [email protected]
> http://dcb.cit.nih.gov/mailman/listinfo/xplor-nih

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