In the monomer library, pyr-SER and pyr-THR links are defined for the
O-glycosylation. A monomer should belong to the "pyranose" group in
the library (or in a user-provided dictionary).

Best regards,
Keitaro

On Fri, 14 Jul 2023 at 09:22, Jon Agirre
<000017a7df66b7b3-dmarc-requ...@jiscmail.ac.uk> wrote:
>
> To the best of my knowledge, there is no o-glycan equivalent of the Coot 
> glyco plugin. We (as in YSBL, York) are working with others to provide tools 
> to build all kinds of glycans, but there's nothing you can use at this point.
> I would deal with it like I'd do with other modifications, get monomer, make 
> the link, repeat. Links are likely to be part of the CCP4 monomer library 
> already. Also, they are likely to be short-ish glycans, so hopefully the task 
> won't be too onerous.
> One issue depending on the resolution is the identification of the 
> monosaccharides. But you can have a look at some of the many possibilities 
> here: 
> https://www.cell.com/cell/pdf/S0092-8674(18)30053-9.pdf?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867418300539%3Fshowall%3Dtrue
> It might help to look at other o-glycosylated structures in the PDB. You can 
> now do pretty powerful searches on the PDB. Alternatively, I'm sure someone 
> in my team could provide a list of all o-glycans Privateer can detect in the 
> PDB.
> Hope this helps,
> Jon
>
>
> On Fri, 14 Jul 2023 at 09:03, Jonas Emsley 
> <00008d0668c7d48d-dmarc-requ...@jiscmail.ac.uk> wrote:
>>
>> Dear All
>>
>>
>>
>> We have a crystal structure with O-glycans for the first time attached to a 
>> Ser and a Thr sidechain
>>
>>
>>
>> If anyone can recommend the procedure for adding these in coot and refining 
>> them in phenix /refmac that would be greatly appreciated
>>
>>
>>
>> All the best
>>
>>
>>
>> jonas
>>
>>
>>
>>
>>
>>
>>
>> ##################################
>> Dr Jonas Emsley
>> Professor of Macromolecular Crystallography,
>> Nottingham Biodiscovery Institute
>> School of Pharmacy,
>> University of Nottingham,
>> University Park,
>> Nottingham.
>> NG72RD
>> Tel: +44 1158467092
>> Fax: +44 1158468002
>> email:jonas.ems...@nottingham.ac.uk
>> http://www.nottingham.ac.uk/research/groups/structural-biology/index.aspx
>>
>> https://orcid.org/0000-0002-8949-8030
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
> --
> Dr Jon Agirre
> Royal Society University Research Fellow (assistant professor)
> CCP4 WG2 co-chair | instruct-ERIC representative @ 3D-Bioinfo SC (Elixir)
> York Structural Biology Laboratory, Department of Chemistry
> University of York, Heslington, YO10 5DD, York, UK
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