[ccp4bb] phase combination

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Subject: Re: w average & riding hydrogens
From: Garib Murshudov garib {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
Date: 2008-01-02

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Subject: Re: phase combination
From: "Meyer, Peter" pameyer {- at -} MCW {- dot -} EDU
Date: 2008-01-02

Subject: phase combination
From: aka akaka druida236 {- at -} HOTMAIL {- dot -} COM
Date: 2008-01-02

Dear CCP4s

I am trying to solve a structure for which I have two datasets: One comes from a selenomethionine derivatized crystal at 3 A resolution and the second comes from a native one that gave 2.6A. I have obtained workable experimental phases by SAD using SOLVE/RESOLVE. With this I have built a model and obtained a calculated map using REFMAC and the native dataset. I cannot push the Rfree further than 34.5 (Rw:28) and given the low quality of the original density I ended up having 6.5% outliers. I was told there is an option with which I could start from scratch calculating a new map using "phase combination" between the derivatized dataset and the model.

Could anyobody clarify further what phase combination is and which are the programs for that purpose?

Regards
Rafael (thats my real name)

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CCP4bb navigation

CCP4bb <-- 2008 <-- January 2008 <-- 02 January 2008

Previous message:
Subject: Re: w average & riding hydrogens
From: Garib Murshudov garib {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
Date: 2008-01-02

Next message:
Subject: Re: phase combination
From: "Meyer, Peter" pameyer {- at -} MCW {- dot -} EDU
Date: 2008-01-02