GROMACS version:2020.4
GROMACS modification: No
I used pdb2gmx command and successfully created a topology file and even did some MD simulations with gromos54a7 ff. But when I rechecked the disulphide bond in the protein topology file, I see no bond function type is generated for S-S bond; bond function type is simply blank. Similarly function types for angles, dihedrals etc are also blank.
Could anybody please help me to understand this. What is the function type for S-S disulphide bond in gromos ff.