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Hello Geoff--

> 
> I have a buried histidine which has NOEs to HD1.    I was trying to hack the
> refine.py script to add the following (below). This seems to be the correct
> top file but I can't find a param file with HISU (using just grep).  Could
> someone please point me toward it?
> 
> 
> # protontate HIS 53
> protocol.initTopology("toph19.his")
> #protocol.initParams("???????")
> xplor.command(r"""
> 
> patch HISU 
>    reference=nil=( resid 53 )
> end
> """)

An easy way to do this is to generate a PSF using seq2psf
and include the -protonateHIS flag. Alternately, within a script you can
use 

psfGen.seqToPSF("file.seq",deprotonateHIS=False)

best regards--
Charles
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