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Hello Vitaly--

> I am trying to make an ethanolamide C-terminal modification:
> -N-CH2-CH2-OH. Because of the atom naming, I am making it as a
> residue, rather than a patch. I have added an appropriate segment to
> protein.top and one of the missing impropers to protein.par. 
> 
> The problem I ran into is that "psfGen.py" automatically patches the
> C-terminus with a "CTER". I can work around this by setting cterm=''
> in psfGen and also modifying the xplor.command a few lines later, but
> I would like some permanent solution. Something similar to the case of
> an acetyl group "if seq[0]=='ACE': nterm='' ", but for the last
> residue would be ideal. 
> 

I'm glad you found a workaround. Here
http://nmr.cit.nih.gov/xplor-nih/updates/2.27/
I've posted a modified psfGen.py with seqToPSF updated to take a new
argument, ctermPatch. If it is set to a blank string, no c-terminal
patching will occur. Does this suit your needs?

best regards--
Charles
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