1vzi
From Proteopedia
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'''STRUCTURE OF SUPEROXIDE REDUCTASE BOUND TO FERROCYANIDE AND ACTIVE SITE EXPANSION UPON X-RAY INDUCED PHOTOREDUCTION''' | '''STRUCTURE OF SUPEROXIDE REDUCTASE BOUND TO FERROCYANIDE AND ACTIVE SITE EXPANSION UPON X-RAY INDUCED PHOTOREDUCTION''' | ||
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[[Category: Niviere, V.]] | [[Category: Niviere, V.]] | ||
[[Category: Royant, A.]] | [[Category: Royant, A.]] | ||
| - | [[Category: | + | [[Category: Dinuclear iron cluster]] |
| - | [[Category: | + | [[Category: Electron transport]] |
| - | [[Category: | + | [[Category: Ferrocyanide]] |
| - | [[Category: | + | [[Category: Microspectrophotometry]] |
| - | [[Category: | + | [[Category: Oxidoreductase]] |
| - | [[Category: | + | [[Category: Photoreduction]] |
| - | [[Category: | + | [[Category: Redox state]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 12:57:16 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 09:57, 3 May 2008
STRUCTURE OF SUPEROXIDE REDUCTASE BOUND TO FERROCYANIDE AND ACTIVE SITE EXPANSION UPON X-RAY INDUCED PHOTOREDUCTION
Overview
Some sulfate-reducing and microaerophilic bacteria rely on the enzyme superoxide reductase (SOR) to eliminate the toxic superoxide anion radical (O2*-). SOR catalyses the one-electron reduction of O2*- to hydrogen peroxide at a nonheme ferrous iron center. The structures of Desulfoarculus baarsii SOR (mutant E47A) alone and in complex with ferrocyanide were solved to 1.15 and 1.7 A resolution, respectively. The latter structure, the first ever reported of a complex between ferrocyanide and a protein, reveals that this organo-metallic compound entirely plugs the SOR active site, coordinating the active iron through a bent cyano bridge. The subtle structural differences between the mixed-valence and the fully reduced SOR-ferrocyanide adducts were investigated by taking advantage of the photoelectrons induced by X-rays. The results reveal that photo-reduction from Fe(III) to Fe(II) of the iron center, a very rapid process under a powerful synchrotron beam, induces an expansion of the SOR active site.
About this Structure
1VZI is a Single protein structure of sequence from Desulfovibrio baarsii. Full crystallographic information is available from OCA.
Reference
Structure of superoxide reductase bound to ferrocyanide and active site expansion upon X-ray-induced photo-reduction., Adam V, Royant A, Niviere V, Molina-Heredia FP, Bourgeois D, Structure. 2004 Sep;12(9):1729-40. PMID:15341736 Page seeded by OCA on Sat May 3 12:57:16 2008
