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2nip

From Proteopedia

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{{STRUCTURE_2nip| PDB=2nip | SCENE= }}
{{STRUCTURE_2nip| PDB=2nip | SCENE= }}
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'''NITROGENASE IRON PROTEIN FROM AZOTOBACTER VINELANDII'''
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===NITROGENASE IRON PROTEIN FROM AZOTOBACTER VINELANDII===
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==Overview==
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The nitrogenase iron (Fe) protein performs multiple functions during biological nitrogen fixation, including mediating the mechanistically essential coupling between ATP hydrolysis and electron transfer to the nitrogenase molybdenum iron (MoFe) protein during substrate reduction, and participating in the biosynthesis and insertion of the FeMo-cofactor into the MoFe-protein. To establish a structural framework for addressing the diverse functions of Fe-protein, crystal structures of the Fe-proteins from Azotobacter vinelandii and Clostridium pasteurianum have been determined at resolutions of 2.2 A and 1.93 A, respectively. These two Fe-proteins are among the more diverse in terms of amino acid sequence and biochemical properties. As described initially for the A. vinelandii Fe-protein in a different crystal form at 2.9 A resolution, each subunit of the dimeric Fe-protein adopts a polypeptide fold related to other mononucleotide-binding proteins such as G-proteins, with the two subunits bridged by a 4Fe:4S cluster. The overall similarities in the subunit fold and dimer arrangement observed in the structures of the A. vinelandii and C. pasteurianum Fe-proteins indicate that they are representative of the conformation of free Fe-protein that is not in complex with nucleotide or the MoFe-protein. Residues in the cluster and nucleotide-binding sites are linked by a network of conserved hydrogen bonds, salt-bridges and water molecules that may conformationally couple these regions. Significant variability is observed in localized regions, especially near the 4Fe:4S cluster and the MoFe-protein binding surface, that change conformation upon formation of the ADP.AlF4- stabilized complex with the MoFe-protein. A core of 140 conserved residues is identified in an alignment of 59 Fe-protein sequences that may be useful for the identification of homologous proteins with functions comparable to that of Fe-protein in non-nitrogen fixing systems.
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==About this Structure==
==About this Structure==
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[[Category: Iron protein]]
[[Category: Iron protein]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 03:22:22 2008''

Revision as of 00:22, 28 July 2008

Image:2nip.png

Template:STRUCTURE 2nip

NITROGENASE IRON PROTEIN FROM AZOTOBACTER VINELANDII

Template:ABSTRACT PUBMED 9677296

About this Structure

2NIP is a Single protein structure of sequence from Azotobacter vinelandii. Full crystallographic information is available from OCA.

Reference

Conformational variability in structures of the nitrogenase iron proteins from Azotobacter vinelandii and Clostridium pasteurianum., Schlessman JL, Woo D, Joshua-Tor L, Howard JB, Rees DC, J Mol Biol. 1998 Jul 24;280(4):669-85. PMID:9677296

Page seeded by OCA on Mon Jul 28 03:22:22 2008

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