How to stop omega trans-cis switching

From: Alex Utev (CMP) (
Date: Mon Mar 03 2014 - 12:11:25 CST

I was wondering if there was a way of disallowing omega torsions to flip from trans to cis conformation?

I have tried removing the corresponding line from the CHARMM parameter file (all22) but this seems to have no effect?

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