Dear all, I'm finishing a refinement using SHELX and Coot (1.3A) and I have a modified Arginine. There’s a blob of positive density (9.04 and 7.01 sigma) binding NH2 in the 2 conformations. I think it could be a hydroxyl there.
1) How can I add that in Coot? 2) Does SHELXL recognise modified residues? How can I get restraints then, by using PRODRG? Any suggestions will be welcome. Cheers, Fátima
