Hi,
There are a couple of programs out there (e.g. Macromodel) that tries
to do this, even for OPLS, but they fail miserably way too
frequently. I've even seen cases where the autogenerated topology was
reported as "likely high quality", but the small molecule didn't even
have unit charge and the atom types were simply not correct.
Having said that, this functionality is implemented in the x2top
tool, but you might need to extend the databases and/or hack it a
bit. If you really want to do it without even checking the
topologies I would prefer a simpler forcefield like Gromos96 over
OPLS, though (fewer atom types mean less errors).
Cheers,
Erik
On Jul 4, 2007, at 3:57 PM, Mark Abraham wrote:
Dear Mark,
The problem is a little bit more complicated. I want to build
topologies
for
dozens of non-peptide inhibitor prototypes using OPLS FF. Thus, if
there
is a
way to build this by an automatic procedure it would save much time.
Well, if there was one, I might have mentioned it before :-)
The difficulty is that assignment of atom type to arbitrary chemical
species is a tricky pattern-recognition problem. Still, this must be
something that programs like Autodock have to deal with, so you should
have a look at such docking programs and see what they do.
Otherwise, you could write such a program... :-)
Mark
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