I was trying to make a restriction to generate a covalent bond between
NZ atom from Lisine with C4 atom of PLP cofator.
I search Manual and modeler-List to find some clues about how to do
If you want to make a distance restraint (this is what your restraints
file is trying to do) between those two atoms, then see
If you really want to make a covalent bond, you'll need to write a
suitable CHARMM patch: see the CHARMM manual. You can then apply it like
the existing DISU patch: