Hi Stefan - There's probably an all-Coot way to do this, but you might also want to check out PyTMs (https://pymolwiki.org/index.php/Pytms <https://pymolwiki.org/index.php/Pytms>), a PyMOL plugin that does PTMs. You can generate it there, then fit it to the density in Coot.
Hope that helps. Cheers, Jared > On Jun 7, 2017, at 9:26 PM, Becker, Stefan <s...@nmr.mpibpc.mpg.de> wrote: > > Hi all, > > in the coot mail archive I found an instruction from 2013 for N-terminal > acetylation: build ala, replace by ACE, edit restraints for ACE to group > L-peptide and apply. The last step does not work, changing to L-peptide > cannot be applied. Could someone give me advice about this? Thanks in advance. > > Stefan