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Re: [ccp4bb] unknown density
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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999
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Subject: unknown density
From: Katja Schleider katjaschleider {- at -} YAHOO {- dot -} DE
Date: 2010-02-03		Next message:
Subject: Re: unknown density
From: Vellieux Frederic Frederic {- dot -} Vellieux {- at -} IBS {- dot -} FR
Date: 2010-02-03


Subject: Re: unknown density
From: "Mark J {- dot -} van Raaij" mark {- dot -} vanraaij {- at -} USC {- dot -} ES
Date: 2010-02-03

as it appears to bear near the guanidine group of an arginine, I would
suggest it is a partially occupied and disordered sulphate and/or
phosphate.
whether this is practically modellable is another matter, a sulphate
at occ. 0.5 is an option, or putting a water with a remark in the pdb
that this water is really modelling partially occupied and disordered
sulphate and/or phosphate.
Mark

Quoting Katja Schleider :

> Dear all,
>
> I found some fairly substantial density in the active site of my
> protein structure. But I don´t know what it should be. My
> crystallisation condition consists of lithium sulfate,
> citrate-phosphate and peg1000. The whole lot doesn't make a dashed
> bit of sense!  Any suggestions to fill this density with something?
> Picture is attached.
>
> Thanks a lot,
>
> Katja
>
>
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