1Y5N image
Entry Detail
PDB ID:
1Y5N
Keywords:
Title:
The crystal structure of the NarGHI mutant NarI-K86A in complex with pentachlorophenol
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-12-02
Release Date:
2005-03-08
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Respiratory nitrate reductase 1 alpha chain
Chain IDs:A
Chain Length:1246
Number of Molecules:1
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Respiratory nitrate reductase 1 beta chain
Chain IDs:B
Chain Length:512
Number of Molecules:1
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Respiratory nitrate reductase 1 gamma chain
Mutations:K86A
Chain IDs:C
Chain Length:225
Number of Molecules:1
Biological Source:Escherichia coli
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
FME C MET N-FORMYLMETHIONINE
Primary Citation
Structural and Biochemical Characterization of a Quinol Binding Site of Escherichia coli Nitrate Reductase A
J.Biol.Chem. 280 14836 14843 (2005)
PMID: 15615728 DOI: 10.1074/jbc.M410457200

Abstact

The crystal structure of Escherichia coli nitrate reductase A (NarGHI) in complex with pentachlorophenol has been determined to 2.0 A of resolution. We have shown that pentachlorophenol is a potent inhibitor of quinol:nitrate oxidoreductase activity and that it also perturbs the EPR spectrum of one of the hemes located in the membrane anchoring subunit (NarI). This new structural information together with site-directed mutagenesis data, biochemical analyses, and molecular modeling provide the first molecular characterization of a quinol binding and oxidation site (Q-site) in NarGHI. A possible proton conduction pathway linked to electron transfer reactions has also been defined, providing fundamental atomic details of ubiquinol oxidation by NarGHI at the bacterial membrane.

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