Dear Michael
I would carefully check the backbone region around the tyrosine and make sure 
it’s correct as errors there might be the issue.
Regards
Christine 

Sent from my iPhone

> On Oct 19, 2020, at 11:52 AM, Boniecki, Michal <michal.bonie...@usask.ca> 
> wrote:
> 
> 
> Hello,
> I have a problem during refining with one of the Tyr residues. It is 
> constantly pushed out of the position during refinement in all 4 chains in 
> ASU.
> I have tried to exclude it from refinement in phenix but it is refined anyway 
> out of the position with wrong geometry. Is there a possibility to fix it 
> during refinement?
> The closest contact it has, is 2.4A between hydroxyl group and C=O of Pro, 
> but Tyr itself is inside hydrophobic cleft (Ile,Pro,Leu)
> Thank You for all help. Stay safe,
> Michal
> 
> <CootTyr.png>
> 
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