Re: [ccp4bb]: R32 pseudotranslational symmetry in crystal

[<rams@poori.biochem.uiowa.edu>]

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Please read 
Carredano, E., Kauppi, B., Choudhury, D., and Ramaswamy, S. (2000) 
Psuedosymmetry characterisation in the rhombohedral crystal form of 
naphthalene dioxygenase.  Acta Crystallographica D56: 313-321.


Will tell you, how to test and correct....

Rams.



On Tue, 25 Feb 2003, N.Manoj wrote:

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> 
> Dear all,
>           We have a problem in refining a structure in space group R32.
> The data processed to 2.9A with  overall Rmerge of 5%, 98% completeness
> and redundancy of 5. AMoRe gave clear solutions for the two expected
> molecules in the asymmetric unit. The packing looked good,  but the
> structure could not be refined below 45% R-factor. Electron density for
> one monomer is good while it is very poor for the other monomer. 
> The two molecules are identical (same rotation function values) in
> orientation and are translated by almost 1/2 along the Z axis. I would
> like to know if there is some way of going about refining this
> structure.   
> I remember some discussion about refinement of structures with  pseudo
> translational symmetry in the ccp4 BB some time back.
> 
> Thanks in advance
> manoj
> 

-- 
S. Ramaswamy
Department of Biochemistry.
University of Iowa.