Thanks Charles,
Swanand

On 9/20/06, [EMAIL PROTECTED] <[EMAIL PROTECTED] > wrote:
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Hello Swanand--

>
> I am trying to use charmm22 forcefield in xplor-nih. I believe the charmm22
> protein files are in toppar/charm22/***allh22x.pro. I copy those those files
> to toppar/charmm22.*** allh22x.pro and I run a simple script to read a
> protein, initialize its topology and parameters. I get this error :
>
>  %PATCH-ERR: dihedral -C    +N    +CA   +HA   not found
>  %PATCH-ERR: dihedral -C    +N    +CA   +CB   not found
>  %PATCH-ERR: dihedral -CB   -CA   -C    -OT2  not found
>  %PATCH-ERR: dihedral -CB   -CA   -C    -OT1  not found
>  %PATCH-ERR: dihedral -HA   -CA   -C    -OT2  not found
>  %PATCH-ERR: dihedral -HA   -CA   -C    -OT1  not found

These errors are due to atoms which don't exist. For instance, GLY has
no HA atom (at the C terminus). I think the resulting structure should
be fine, though.

>
> I have attached my script and output, and also the inputs sequence file and
> coordinates.

I modified your script to perform some dynamics, and all seems ok- it is
attached.

regards--
Charles



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