Dear all,

I would like to ask for some advice on the best way to handle poorly defined 
side chains for deposition of a low-resolution (~3.6 Å) X-ray structure.

For a number of residues in my structure, there is little or no side-chain 
density, so I do not feel confident modelling the full side chains. At the 
moment, I have deleted the residues that are not supported by the electron 
density, which also gives better geometry and refinement statistics.

I asked the PDBe deposition team whether they had any preference between 
deleting the unsupported side-chain atoms or keeping them with zero occupancy. 
They replied that they do not have any specific requirements, as long as the 
deposited model is appropriate.

I was therefore wondering how people here would normally deal with this 
situation for PDB deposition. Would you generally:

* delete the unsupported side-chain atoms,
* keep the full side chains but set the unsupported atoms to zero occupancy,
* or use another approach?

I’d be interested to hear what people usually do for structures around this 
resolution.

Many thanks in advance.

Best regards,

Martin Hu

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