Owen, Michael wrote:

Hello gmx users,

when I convert a pdb file of a peptide that contains a valyl residue into a .gro file a separate "group" is made for the atoms in the valyl residue.

In what sense...? please include a relevant file excerpt, and the commands that created it.

This has happened when OPLSAA/l and the GROMOS96 53a6 force fields were used. The molecule appears as one in the topology file, and the atomic description of the valyl residue in the pdb file matches that of the ffoplsa.rtp file.

Have these forcefields really being modified for a radical, or are you really describing a valine residue?

Mark
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