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Biochemistry (Moscow)

, Volume 76, Issue 2, pp 186–195 | Cite as

Cys377 residue in NqrF subunit confers Ag+ sensitivity of Na+-translocating NADH:quinone oxidoreductase from Vibrio harveyi

  • M. S. Fadeeva
  • Y. V. Bertsova
  • L. Euro
  • A. V. BogachevEmail author
Article

Abstract

The Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) is a component of the respiratory chain of various bacteria that generates a redox-driven transmembrane electrochemical Na+ potential. The Na+-NQR activity is known to be specifically inhibited by low concentrations of silver ions. Replacement of the conserved Cys377 residue with alanine in the NqrF subunit of Na+-NQR from Vibrio harveyi resulted in resistance of the enzyme to Ag+ and to other heavy metal ions. Analysis of the catalytic activity also showed that the rate of electron input into the mutant Na+-NQR decreased by about 14-fold in comparison to the wild type enzyme, whereas all other properties of NqrFC377A Na+-NQR including its stability remained unaffected.

Key words

Na+-translocating NADH:quinone oxidoreductase NqrF ferredoxin:NADP+ oxidoreductase sensitivity to heavy metals protein stability 

Abbreviations

DDM

n-dodecyl-β-D-maltoside

dNADH

reduced nicotinamide hypoxanthine dinucleotide

FNR

ferredoxin:NADP+ oxidoreductase

HQNO

2-n-heptyl-4-hydroxyquinoline N-oxide

K3

menadione

Na+-NQR

Na+-translocating NADH:quinone oxidoreductase

NEM

N-ethylmaleimide

Q

ubiquinone

QH2

ubiquinol

Tm

unfolding temperature

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • M. S. Fadeeva
    • 1
  • Y. V. Bertsova
    • 1
  • L. Euro
    • 2
  • A. V. Bogachev
    • 1
    Email author
  1. 1.Department of Molecular Energetics of Microorganisms, Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  2. 2.Research Program of Molecular Neurology, Biomedicum-HelsinkiUniversity of HelsinkiHelsinkiFinland

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