8AD5 image
Entry Detail
PDB ID:
8AD5
Keywords:
Title:
X-ray structure of NqrF(129-408)of Vibrio cholerae variant F406A
Biological Source:
PDB Version:
Deposition Date:
2022-07-07
Release Date:
2023-07-12
Method Details:
Experimental Method:
Resolution:
1.65 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Na(+)-translocating NADH-quinone reductase subunit F
Mutations:F406A
Chain IDs:A, B
Chain Length:281
Number of Molecules:2
Biological Source:Vibrio cholerae
Primary Citation
Conformational coupling of redox-driven Na + -translocation in Vibrio cholerae NADH:quinone oxidoreductase.
Nat.Struct.Mol.Biol. 30 1686 1694 (2023)
PMID: 37710014 DOI: 10.1038/s41594-023-01099-0

Abstact

In the respiratory chain, NADH oxidation is coupled to ion translocation across the membrane to build up an electrochemical gradient. In the human pathogen Vibrio cholerae, the sodium-pumping NADH:quinone oxidoreductase (Na+-NQR) generates a sodium gradient by a so far unknown mechanism. Here we show that ion pumping in Na+-NQR is driven by large conformational changes coupling electron transfer to ion translocation. We have determined a series of cryo-EM and X-ray structures of the Na+-NQR that represent snapshots of the catalytic cycle. The six subunits NqrA, B, C, D, E, and F of Na+-NQR harbor a unique set of cofactors that shuttle the electrons from NADH twice across the membrane to quinone. The redox state of a unique intramembranous [2Fe-2S] cluster orchestrates the movements of subunit NqrC, which acts as an electron transfer switch. We propose that this switching movement controls the release of Na+ from a binding site localized in subunit NqrB.

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