2ca6
From Proteopedia
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| - | [[Image:2ca6.gif|left|200px]]<br /> | + | [[Image:2ca6.gif|left|200px]]<br /><applet load="2ca6" size="450" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="2ca6" size="450" color="white" frame="true" align="right" spinBox="true" | + | |
caption="2ca6, resolution 2.20Å" /> | caption="2ca6, resolution 2.20Å" /> | ||
'''MIRAS STRUCTURE DETERMINATION FROM HEMIHEDRALLY TWINNED CRYSTALS'''<br /> | '''MIRAS STRUCTURE DETERMINATION FROM HEMIHEDRALLY TWINNED CRYSTALS'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2CA6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe] with SO4 as [http://en.wikipedia.org/wiki/ligand ligand]. | + | 2CA6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe] with SO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Site: <scene name='pdbsite=AC1:So4 Binding Site For Chain B'>AC1</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2CA6 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: signaling regulator]] | [[Category: signaling regulator]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Dec 18 19:15:53 2007'' |
Revision as of 17:06, 18 December 2007
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MIRAS STRUCTURE DETERMINATION FROM HEMIHEDRALLY TWINNED CRYSTALS
Overview
The structure of Rna1p was originally solved to 2.7 A resolution by MIRAS, from crystals with partial hemihedral twinning in space group I4(1), [Hillig et al. (1999), Mol. Cell, 3, 781-791] by finding a low-twinned, native crystal (twin fraction alpha=0.06) and after twin correction of all, data sets. Rna1p crystals have now been used to examine how far twinning, and twin correction affect MIR phasing with a higher resolution but highly, twinned native data set. Even high hemihedral twinning [alphanative=0.39, alphaderivative=0.24] would not have hindered heavy-atom site, identification of strong derivatives using difference Patterson maps., However, a weaker derivative could have been missed and refinement would, have stalled at high R values had twinning not been identified and, accounted for. Twin correction improved both site identification, experimental phasing statistics and MIR map quality. Different strategies, were tested for refinement against twinned data. Using uncorrected twinned, data and TWIN-CNS, Rna1p has now been refined to 2.2 A resolution (final, twinned R and Rfree were 0.165 and 0.218, respectively). The increased, resolution enabled release of the NCS restraints and allowed new, conclusions to be drawn on the flexibility of the two molecules in the, asymmetric unit. In the case of Rna1p, twinned crystal growth was possible, owing to the presence of a twofold NCS axis almost parallel to the twin, operator.
About this Structure
2CA6 is a Single protein structure of sequence from Schizosaccharomyces pombe with SO4 as ligand. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Detecting and overcoming hemihedral twinning during the MIR structure determination of Rna1p., Hillig RC, Renault L, Acta Crystallogr D Biol Crystallogr. 2006 Jul;62(Pt 7):750-65. Epub 2006, Jun 20. PMID:16790931
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Categories: Schizosaccharomyces pombe | Single protein | Hillig, R.C. | Renault, L. | SO4 | Gap | Gtpase activation | Gtpase-activating protein | Hemihedral twinning | Leucine-rich repeat protein | Lrr | Merohedral twinning | Merohedry | Nuclear transport | Rangap | Rna1p | Signaling activator | Signaling protein | Signaling regulator
