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Hello Renate Gessmann, On 11/04/14 04:19, Renate Gessmann wrote: > How do I complete a residue when I have only one atom (for example > the SG in Cys as part of a disulfite bond), but nice density without neighboring > residues? So, a 'add terminal residue' is not possible, If I understood correctly, you want to add a Cys, connected via a disulfide bond to a Cys that you have already. If so, then yes, you are right, "Add Terminal Residue" is not useful for you, as that adds only via peptide links. > and if possible, I would like not to go to 'Ca-baton-mode'. Very reasonable. And that also only adds via peptide links. > Same problem arises when the C=O group somewhere > is missing. Yes, that's right. Coot needs 4 backbone atoms (I think). > Here the workaround is, to delete the other atoms of the residue and > to 'add a terminal residue'. Yes, that's right (and is part of the tutorial). > If I place the missing atoms 'on > pointer', they have a different name and chain, Different names? Not sure that I agree with that - the atom names and the residue name should be correct. Get monomer will create a new molecule sure, you can merge that in with the current one... > so I have to leave > coot to edit it correctly. You can renumber and change change ids in Coot - it's a bit clumsy a the moment though. It should be more clever. > There is surely something more easy. > :-(. But maybe I misunderstood. If you have the main-chain atoms in place, then you can complete the residue with side-chain atoms using fill-partial-residue (which I have bound to the "k" key). Hope this helps. Paul.