2j7a
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Oxidation of membrane-bound quinol molecules is a central step in the | + | Oxidation of membrane-bound quinol molecules is a central step in the respiratory electron transport chains used by biological cells to generate ATP by oxidative phosphorylation. A novel family of cytochrome c quinol dehydrogenases that play an important role in bacterial respiratory chains was recognised in recent years. Here, we describe the first structure of a cytochrome from this family, NrfH from Desulfovibrio vulgaris, which forms a stable complex with its electron partner, the cytochrome c nitrite reductase NrfA. One NrfH molecule interacts with one NrfA dimer in an asymmetrical manner, forming a large membrane-bound complex with an overall alpha(4)beta(2) quaternary arrangement. The menaquinol-interacting NrfH haem is pentacoordinated, bound by a methionine from the CXXCHXM sequence, with an aspartate residue occupying the distal position. The NrfH haem that transfers electrons to NrfA has a lysine residue from the closest NrfA molecule as distal ligand. A likely menaquinol binding site, containing several conserved and essential residues, is identified. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Archer, M.]] | [[Category: Archer, M.]] | ||
[[Category: Oliveira, T.]] | [[Category: Oliveira, T.]] | ||
| - | [[Category: Pereira, I | + | [[Category: Pereira, I A.C.]] |
| - | [[Category: Rodrigues, M | + | [[Category: Rodrigues, M L.]] |
[[Category: ACT]] | [[Category: ACT]] | ||
[[Category: CA]] | [[Category: CA]] | ||
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[[Category: quinol dehydrogenase]] | [[Category: quinol dehydrogenase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:59:59 2008'' |
Revision as of 16:00, 21 February 2008
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CRYSTAL STRUCTURE OF CYTOCHROME C NITRITE REDUCTASE NRFHA COMPLEX FROM DESULFOVIBRIO VULGARIS
Overview
Oxidation of membrane-bound quinol molecules is a central step in the respiratory electron transport chains used by biological cells to generate ATP by oxidative phosphorylation. A novel family of cytochrome c quinol dehydrogenases that play an important role in bacterial respiratory chains was recognised in recent years. Here, we describe the first structure of a cytochrome from this family, NrfH from Desulfovibrio vulgaris, which forms a stable complex with its electron partner, the cytochrome c nitrite reductase NrfA. One NrfH molecule interacts with one NrfA dimer in an asymmetrical manner, forming a large membrane-bound complex with an overall alpha(4)beta(2) quaternary arrangement. The menaquinol-interacting NrfH haem is pentacoordinated, bound by a methionine from the CXXCHXM sequence, with an aspartate residue occupying the distal position. The NrfH haem that transfers electrons to NrfA has a lysine residue from the closest NrfA molecule as distal ligand. A likely menaquinol binding site, containing several conserved and essential residues, is identified.
About this Structure
2J7A is a Protein complex structure of sequences from Desulfovibrio vulgaris with , , and as ligands. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
X-ray structure of the membrane-bound cytochrome c quinol dehydrogenase NrfH reveals novel haem coordination., Rodrigues ML, Oliveira TF, Pereira IA, Archer M, EMBO J. 2006 Dec 13;25(24):5951-60. Epub 2006 Nov 30. PMID:17139260
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