Hi Robert,

It has been a while for me, but in my hand the occupancy and B-factor refinement worked well together. If you want to be extra sure you can set different starting occupancies to see of the refinements converge to similar values.

Cheers,
Robbie

On 30 May 2025 16:43, Robert Oeffner <[email protected]> wrote:

Hi,

I am wondering if Refmac version 5.8 is suitable for refining occupancies of a ligand reliably in a ligand-protein complex. I have heard that in older versions there used to be some instability if refining occupancies and B-factors together. Is that still the case? If I try fixing B-factors during refinement would the following shell script below do the job (chain X is for the ligand)? After running the refinement occupancies for the ligand come out refined. But unexpectedly, so do the B-factors as far as I can tell.

Many thanks,

Robert


#!/bin/bash
#

refmac5 HKLIN data.mtz XYZIN model.pdb LIBIN ligands.dict << eof

make refi bfac none
occupancy group id 1 chain X
occupancy refine 

eof

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