I want to simulation cytochrome C that it has two parts HEME and protein. I have charmm files par_heme.pdf and top_heme.pdf heme group but I do not know how to convert pdf file to *. inp because the paper said these are charmm file *.inp.

also, I want to combine top par files for protein and heme to one and convert to Gromacs topology file.

I searched and found I could with psfgen and top tools plugin in VMD.

I do not know how to use vmd about it.

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