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[[Image:1ndr.gif|left|200px]]
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[[Image:1ndr.png|left|200px]]


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{{STRUCTURE_1ndr|  PDB=1ndr  |  SCENE=  }}  
{{STRUCTURE_1ndr|  PDB=1ndr  |  SCENE=  }}  


'''CRYSTALLOGRAPHIC STRUCTURE OF A BLUE COPPER NITRITE REDUCTASE FROM ALCALIGENES XYLOSOXIDANS'''
===CRYSTALLOGRAPHIC STRUCTURE OF A BLUE COPPER NITRITE REDUCTASE FROM ALCALIGENES XYLOSOXIDANS===




==Overview==
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Copper-containing nitrite reductases (NiR's) have been conveniently subdivided into blue and green NiR's which are thought to be redox partners of azurins and pseudo-azurins, respectively. Crystal structures of two green NiR's have recently been determined. Alcaligenes xylosoxidans has been shown to have a blue-copper nitrite reductase (AxNiR) and two azurins with 67% homology both of which donate electrons to it effectively. The first crystal structure of a blue NiR (AxNiR) in its oxidized and nitrite-bound forms, with particular emphasis to the Cu sites, is presented. The Cu-Smet distance is the same as those in the green NiR's. Thus, the length of this interaction is unlikely to be responsible for differences in colour. Crystallographic data presented here taken together with structural data of other single Cu type-1 proteins and their mutants suggest that the displacement of Cu from the strong ligand plane is perhaps the cause for the differences in colour observed for otherwise 'classical' blue Cu centre. Nitrite is observed binding to the catalytic Cu in a bidentate fashion displacing the water molecule, offering a neat rationalization for the XAFS observation that the type-2 Cu-ligand distances increase on nitrite binding as a result of increased coordination. These results are discussed in terms of enzyme mechanism.
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{{ABSTRACT_PUBMED_15299906}}


==About this Structure==
==About this Structure==
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[[Category: Nitrite reduction]]
[[Category: Nitrite reduction]]
[[Category: Reductase]]
[[Category: Reductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:01:43 2008''

Revision as of 02:01, 29 July 2008

File:1ndr.png

Template:STRUCTURE 1ndr

CRYSTALLOGRAPHIC STRUCTURE OF A BLUE COPPER NITRITE REDUCTASE FROM ALCALIGENES XYLOSOXIDANS

Template:ABSTRACT PUBMED 15299906

About this Structure

1NDR is a Single protein structure of sequence from Achromobacter xylosoxidans. Full crystallographic information is available from OCA.

Reference

Structures of a blue-copper nitrite reductase and its substrate-bound complex., Dodd FE, Hasnain SS, Abraham ZH, Eady RR, Smith BE, Acta Crystallogr D Biol Crystallogr. 1997 Jul 1;53(Pt 4):406-18. PMID:15299906

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