Re: [ccp4bb] Why there are difference density when occupancy is 1.00

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Subject: Re: Characterization of common salt crystal forms?
From: "R {- dot -} M {- dot -} Garavito" garavito {- at -} MSU {- dot -} EDU
Date: 2008-01-23

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Subject: Re: Why there are difference density when occupancy is 1.00
From: Eleanor Dodson ccp4 {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
Date: 2008-01-23

Hard to say without more information.

Have you refined the B factors for these residues? Most building
software gives some arbitrary b value, which must then be refined. (In
fact after any rebuilding activity you need to do a few cycles of
refinement before looking at the maps again)

Eleanor

Sun Tang wrote:
> Hello Everyone,
>
> When I refined a structure, I found strong difference density Fo-Fc at 3 sigma contour for the for five residues which already have occupancy of 1. The density is continuous and so strong as if I did not put the residues there. Why was that? Can I put greater than 1 occupancy for those residues?
>
> Thank you very much for your opinions and suggestions!
>
> Best wishes,
>
> Sun Tang
>
>
> ---------------------------------
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CCP4bb <-- 2008 <-- January 2008 <-- 23 January 2008

Previous message:
Subject: Re: Characterization of common salt crystal forms?
From: "R {- dot -} M {- dot -} Garavito" garavito {- at -} MSU {- dot -} EDU
Date: 2008-01-23

Next message:
Subject: Question about freeR tag
From: Zheng Zhou zhengzhouzz {- at -} GMAIL {- dot -} COM
Date: 2008-01-23