How to handle phospho-serine residues in protein structures for Martini coarse-grained simulation?

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Hi everyone,

I am working on a protein that contains a phospho-serine residue. I am using Martini 2.2 force field and GROMACS 2022.5 .

How to handle the phospho-serine residue, as it is not recognized by topology and how can I prepare a protein containing a phospho-serine residue for Martini force field simulation? Is there a specific parameter file or a tutorial that I can follow?

I would appreciate any help or advice on this issue.

Thank you very much.