Hello, I was wondering if you are refining the ligand occupancy. Eleanor 
mentioned resolution which is important here. If it's good enough, occupancy 
refinement of the ligand or the fragment will clean the map up, assuming the 
occupancy is much less than one. Sorry, if I'm just saying the obvious...

Best wishes, Jon Cooper
-------- Original Message --------
On 24 Nov 2020, 11:28, Nika Žibrat wrote:

> Hello,
>
> I have a question about protein-ligand, of which ligand displays an ambiguous 
> electron density. I am solving a structure of protein with ligand which was 
> obtained via soaking. Structural characteristics indicate the ligand is 
> present however the electron density is quite vague and too small for the 
> size of the whole ligand. I did a Polder map which showed much larger area of 
> green density. After insertion of my ligand into the green density in Polder 
> I ran phenix.refine and there is a lot of red on the spot where the ligand is 
> which was to be expected. This leaves me wondering how, if even do I 
> incorporate the polder map data into my refine input.
>
> My question is, how do I continue refining and validating the structure in 
> this case?
>
> Thank you,
>
> Nika Žibrat
>
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