pragya chohan wrote:
Thanks Mark. The C terminal does not have a -COOH group at the end but rater
has a -OH group.... PHL is actually PHENYLALANINOL.
But when i put option 2 whn prompted for
select C-terminus type (end)>> 0: COO->> 1: COOH>> 2: None
Well that won't give you phenylalaninol as a C-terminal fragment.
i still get an error Atom C not found in residue 21 while adding improper.
I checked the naming in ffgmx.rtp but everything seems to be fine.
There's no atom named C in PHL, so it can't be fine. If phenylalaninol
doesn't have a -CO- fragment to link to the next residue, then this
problem will occur. The carbonyl carbon is conventionally named "C" and
the next residue expects to be able to make an amide bond to it with its
amino N. I don't know what the chemistry for your structure is, but if
it doesn't involve normal peptide linkages between residues then pdb2gmx
will struggle. You may need to look up specbond.dat in the manual/wiki.
Mark
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