Journal
FEMS MICROBIOLOGY LETTERS
Volume 279, Issue 1, Pages 116-123Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1574-6968.2007.01015.x
Keywords
Na+-translocating NADH : quinone oxidoreductase; sodium potential; Vibrio; respiratory chain; diphenyliodonium
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The catalytic properties of sodium-translocating NADH:quinone oxidoreductases (Na+-NQRs) from the marine bacterium Vibrio harveyi, the enterobacterium Klebsiella pneumoniae, and the soil microorganism Azotobacter vinelandii have been comparatively analyzed. It is shown that these enzymes drastically differ in their affinity to sodium ions. The enzymes also possess different sensitivity to inhibitors. Na+-NQR from A. vinelandii is not sensitive to low 2-n-heptyl-4-hydroxyquinoline N-oxide (HQNO) concentrations, while Na+-NQR from K. pneumoniae is fully resistant to either Ag+ or N-ethylmaleimide. All the Na+-NQR-type enzymes are sensitive to diphenyliodonium, which is shown to modify the noncovalently bound FAD of the enzyme.
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