Dear all,

I want to run a simulation for an enzyme. It demands me to incorporate a Molecular hydrogen Topology with a dummy atom in between in the simulation in order to study the path of hydrogen in it.The problem is , the topology file I built induces many errors when i come to the energy minimization step. The version of gromacs I am using is 4.0. The topology file I built is as follows



[ moleculetype ]
;name    nrexcl
  H2       3

[ atoms ]
; nr type resnr residu atom cgnr charge mass ; total charge 1 H 1 H2 H1 1 0.475 1.00800 ; 0.00 2 H 1 H2 H2 1 0.475 1.00800 ; 0.00 3 DUM 1 H2 DUM 1 -0.950 0.000

[ virtual_sites2 ]
; Site from funct a
3 1 2 1 0.7439756


When ever I insert the hydrogen+dummy atom topology in the protein's .gro file, an error is generated regarding mismatch of residues or the dummy atom having mass 0 .

I would be really grateful if anyone could provide me the hydrogen molecule topology and give some pointers towards it.

Thank you,

Jyotsna

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