Re: [AMBER] peptide bond restraints

From: Carlos Simmerling <>
Date: Thu, 12 Jul 2018 19:08:22 -0400

Ff14SB doesn't have ligand parameters - did you load a modified force field
for a ligand? Or is the ligand a standard peptide? If not I suspect it is
something in how the ligand was set up.

On Thu, Jul 12, 2018, 6:19 PM lucrecia bogado <> wrote:

> Amber List members,
> I'm new to Amber handling and I'm trying to solve a problem:
> I have been running production MD simulation of enzyme with a ligand by
> Amber14 with ff14sb force field in periodic water box, but amidic bond or
> peptide bond (CO-NH) of the ligand rotates during the dynamics
> I would like to know what restrictions should be placed to avoid this
> rotation or where to look for such specifications, because in the user's
> manual they are not very clear.
> I would appreciate your help.
> Thank you,
> Lucrecia
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Received on Thu Jul 12 2018 - 16:30:02 PDT
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