The rtp file format and its acceptable entries are not forcefield-specific (oplsaa seems to look up triplets for [ angles ] elsewhere), I just wanted to give an example of that.
The oplsaa version of aminoacids.rtp only lists dihedral and improper angles explicitly, and that is exactly what's grompp complaining about in your case.
Alex
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Dear Sir I am using oplsaa force field. In the .rtp file i did not found angles secion for any amino acid. yes there are sections for dihedrals and impropers. sorry for troubling you. Best Anurag Dobhal Juniour Research fellow Supervisor: Dr. Ratnesh D. Jain Department of chemical engineering Insttute of Chemical Technology 400019, +91 8898486877 On Mon, May 4, 2015 at 1:03 PM, Alex <nedoma...@gmail.com> wrote: "Which angles?" -- wait until Mark Abraham gets here. You must have a very special version of aminoacids.rtp Example: https://github.com/gromacs/gromacs/blob/master/share/top/gromos43a2.ff/aminoacids.rtp
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Best regards,
Alex mailto:nedoma...@gmail.com
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