Hi,

I am trying to refine a structure with a cyclic peptide ligand.

I create a 'TRANS' link between the C-ter and N-ter residues of the cyclic peptide during refinement.

But there is obvious no bond formed between the two residues in the refined structure.

I checked the geo file and found that there are only angle restraints but no bond restraints between the two residues

Anyone can help me out?

Thanks in advance!

Wei

P.S.

refinement.pdb_interpretation.apply_cif_link {

data_link = TRANS

residue_selection_1 = chain D and resname MVA and resid 5005

residue_selection_2 = chain D and resname ARG and resid 5001

}