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[[Image:2min.gif|left|200px]]
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{{STRUCTURE_2min|  PDB=2min  |  SCENE=  }}  
{{STRUCTURE_2min|  PDB=2min  |  SCENE=  }}  


'''NITROGENASE MOFE PROTEIN FROM AZOTOBACTER VINELANDII, OXIDIZED STATE'''
===NITROGENASE MOFE PROTEIN FROM AZOTOBACTER VINELANDII, OXIDIZED STATE===




==Overview==
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The structure of the nitrogenase MoFe-protein from Azotobacter vinelandii has been refined to 2.0 A resolution in two oxidation states. EPR studies on the crystals indicate that the structures correspond to the spectroscopically assigned oxidized (P(OX)/M(OX)) and the native or dithionite-reduced (P(N)/M(N)) forms of the enzyme. Both MoFe-protein structures are essentially identical, with the exception of the P-cluster. The MoFe-protein P-cluster in each state is found to contain eight Fe and seven S atoms. Interconversion between the two redox states involves movement of two Fe atoms and an exchange of protein coordination for ligands supplied by a central S atom. In the oxidized P(OX) state, the cluster is coordinated by the protein through six cysteine ligands, Ser-beta188 O gamma, and the backbone amide of Cys-alpha88. In the native P(N) state, Ser-beta188 O gamma and the amide N of Cys-alpha88 no longer coordinate the cluster due to movement of their coordinated Fe atoms toward the central sulfur. Consequently, this central sulfur adopts a distorted octahedral environment with six surrounding Fe atoms. A previously described model of the P-cluster containing 8Fe-8S likely reflects the inappropriate modeling of a single structure to a mixture of these two P-cluster redox states. These observed redox-mediated structural changes of the P-cluster suggest a role for this cluster in coupling electron transfer and proton transfer in nitrogenase.
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{{ABSTRACT_PUBMED_9063865}}


==About this Structure==
==About this Structure==
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[[Category: Nitrogen metabolism]]
[[Category: Nitrogen metabolism]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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Revision as of 13:42, 27 July 2008

File:2min.png

Template:STRUCTURE 2min

NITROGENASE MOFE PROTEIN FROM AZOTOBACTER VINELANDII, OXIDIZED STATE

Template:ABSTRACT PUBMED 9063865

About this Structure

2MIN is a Protein complex structure of sequences from Azotobacter vinelandii. This structure supersedes the now removed PDB entry 1min. Full crystallographic information is available from OCA.

Reference

Redox-dependent structural changes in the nitrogenase P-cluster., Peters JW, Stowell MH, Soltis SM, Finnegan MG, Johnson MK, Rees DC, Biochemistry. 1997 Feb 11;36(6):1181-7. PMID:9063865

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