2J7A image
Entry Detail
PDB ID:
2J7A
Keywords:
Title:
Crystal structure of cytochrome c nitrite reductase NrfHA complex from Desulfovibrio vulgaris
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2006-10-06
Release Date:
2006-12-06
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CYTOCHROME C NITRITE REDUCTASE NRFA
Chain IDs:A, B, D, E, G, H, J, K, M, N, P, Q
Chain Length:500
Number of Molecules:12
Biological Source:DESULFOVIBRIO VULGARIS
Polymer Type:polypeptide(L)
Description:CYTOCHROME C QUINOL DEHYDROGENASE NRFH
Chain IDs:C, F, I, L, O, R
Chain Length:159
Number of Molecules:6
Biological Source:DESULFOVIBRIO VULGARIS
Primary Citation
X-Ray Structure of the Membrane-Bound Cytochrome C Quinol Dehydrogenase Nrfh Reveals Novel Haem Coordination.
Embo J. 25 5951 ? (2006)
PMID: 17139260 DOI: 10.1038/SJ.EMBOJ.7601439

Abstact

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.

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