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In enzymology, a nitroquinoline-N-oxide reductase (EC 1.7.1.9) is an enzyme that catalyzes the chemical reaction

4-(hydroxyamino)quinoline N-oxide + 2 NAD(P)+ + H₂O ${\displaystyle \rightleftharpoons }$ 4-nitroquinoline N-oxide + 2 NAD(P)H + 2 H

The 4 substrates of this enzyme are 4-hydroxyaminoquinoline N-oxide, NAD, NADP, and H₂O, whereas its 4 products are 4-nitroquinoline N-oxide, NADH, NADPH, and H.

This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 4-(hydroxyamino)quinoline N-oxide:NADP+ oxidoreductase. Other names in common use include 4-nitroquinoline 1-oxide reductase, 4NQO reductase, and NAD(P)H2:4-nitroquinoline-N-oxide oxidoreductase.

References

• Toriyama N (1965). "". Nichidai Igaku Zasshi. 24: 423–432.
• Stanley JS, York JL, Benson AM (1992). "Nitroreductases and glutathione transferases that act on 4-nitroquinoline 1-oxide and their differential induction by butylated hydroxyanisole in mice". Cancer Res. 52 (1): 58–63. PMID 1370076.

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