You can use my extensions (https://github.com/olibclarke/coot-trimmings) to do this in coot - I have a custom menu item for mutating a residue range to UNK. Or you can do it by manually editing the PDB file but that is a pain
Cheers
Oli
> On Nov 15, 2017, at 4:01 PM, Yang Shi <[log in to unmask]> wrote:
>
> Dear colleagues,
>
> I need to use UNKs in coordinates to represent a unknown transmembrane helix.
> How can I mutate the residues to UNK? By COOT? Or change it in PDB file manually?
>
> Thanks in advance,
> Yang
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