Hi Edward,
The following error occurs when loading the SpUreE_dimer_H_new.pdb and hadded_2.pdb PDB files (but not the SpUreE_dimer_H.pdb file)
OK at least now I know where to look for error. In the "good" file SpUreE_dimer_H.pdb, I have no headers, the two chains are labeled A and B, and the residue numbering continues on after the end of chain A; same thing for another file that also works, generated using MODELLER and that contains three lines made by MODELLER itself, two chains labeled A and B and residue numbering continuing after chain A, the zinc atom is also present; In the "bad" file SpUreE_dimer_H_new.pdb, I have the PDB headers, chains labeled A and B, and the residue numbering restarts from 1 after the end of chain A; so, restarting residue numbering is "bad" In the "bad" file hadded_2.pdb, I have the PDB headers, I have only one chain that reaches only up to residue 143 (missing four residues) and the Zn ion and water molecules are still there; here the problem is probably the number of residues. Stefano