What vdw and electrostatic parameters to use with Amber ff19sb

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2

Hey,

you should not used the non-bonded interaction parameters specified for the CHARMM36 FF with the AMBER FF. There was a discussion about which parametes are needed for the AMBER FF here.

Also you can not use ParmEd to convert a ff19sb topology to GROMACS format (see here and here.

A possible alternative to generate a ff19sb topology in the GROMACS format would be CHARMM-GUI or using a script to convert the AMBER ff19sb topology to a GROMACS topology.