Reading ca pdb in gromacs

User discussions
1

GROMACS version: 5.1.5
GROMACS modification: Yes/No
I am trying to read a CA-only pdb but getting the error message “Fatal error:
Residue 1 named ASP of a molecule in the input file was mapped
to an entry in the topology database, but the atom N used in
that entry is not found in the input file. Perhaps your atom
and/or residue naming needs to be fixed.”

2

pdb2gmx requires that all atoms of all residues be present (except H, which it can build). Providing a coordinate file with only Cα atoms is useless for pdb2gmx.