Cited by 411Gout, Hyperuricemia, Uric AcidNitric Oxide and Endothelin EffectsRedox biology and oxidative stress

Reduction of nitrite to nitric oxide catalyzed by xanthine oxidoreductase

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Godber, Ben L.J., Doel, Justin J., Sapkota, Gopal P., Blake, David R., Stevens, Cliff R., Eisenthal, Robert, Harrison, Roger·2000·Journal of Biological Chemistry

Abstract

Xanthine oxidase (XO) was shown to catalyze the reduction of nitrite to nitric oxide (NO), under anaerobic conditions, in the presence of either NADH or xanthine as reducing substrate. NO production was directly demonstrated by ozone chemiluminescence and showed stoichiometry of approximately 2:1 versus NADH depletion. With xanthine as reducing substrate, the kinetics of NO production were complicated by enzyme inactivation, resulting from NO-induced conversion of XO to its relatively inactive desulfo-form. Steady-state kinetic parameters were determined spectrophotometrically for urate production and NADH oxidation catalyzed by XO and xanthine dehydrogenase in the presence of nitrite under anaerobic conditions. pH optima for anaerobic NO production catalyzed by XO in the presence of nitrite were 7.0 for NADH and </=6.0 for xanthine. Involvement of the molybdenum site of XO in nitrite reduction was shown by the fact that alloxanthine inhibits xanthine oxidation competitively with nitrite. Strong preference for Mo=S over Mo=O was shown by the relatively very low NADH-nitrite reductase activity shown by desulfo-enzyme. The FAD site of XO was shown not to influence nitrite reduction in the presence of xanthine, although it was clearly involved when NADH was the reducing substrate. Apparent production of NO decreased with increasing oxygen tensions, consistent with reaction of NO with XO-generated superoxide. It is proposed that XO-derived NO fulfills a bactericidal role in the digestive tract.

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  • Xanthine oxidoreductase reduces inorganic nitrate and nitrite under low oxygen tension as occurs in ischemia.

    “In addition to its role in purine catabolism and in reduction of molecular oxygen to superoxide, xanthine oxidoreductase (XOR) has been identified to reduce inorganic nitrate and nitrite under low oxygen tension as it occurs in ischemia.84 -86”
  • Xanthine oxidase may catalytically reduce nitrite back to NO under several circumstances.

    “However, XO may also catalytically reduce nitrite back to NO under several circumstances [90, 100, 101].”

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  1. Bray, R. C. (1975) in The Enzymes (Boyer, P. D., ed) Vol. 12, 3rd Ed., pp. 299 -420, Academic Press, New York
  2. Robins, R. K., Revanker, G. R., O'Brein, D. E., Springer, R. H., Novinson, T., Albert, A., Senga, K., Miller, J. P., and Streeter, D. G. (1985) J. Hetercyclic Chem. 22, 601-634
  3. Miyamoto, Y., Akaike, T., Yoshida, M., Goto, S., Horie, H., and Maeda, H. (1996) Proc. Soc. Exp. Biol. Med. 211, 366 -373
  4. White, C. R., Brock, T. A., Chang, L-Y., Crapo, J., Briscoe, P., Ku, D., Bradley, W. A., Gianturco, S. H., Gore, J., Freeman, B. A., and Tarpey, M. M. (1994) Proc. Natl. Acad. Sci. U. S. A. 91, 1044 -1048
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Authors
Godber, B. L. J., Doel, J. J., Sapkota, G. P., Blake, D. R., Stevens, C. R., Eisenthal, R., & Harrison, R.
Affiliations
University of Bath (GB)
Corresponding author
Harrison, Roger
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2000-03
Volume
275
Issue
11
Pages
7757-7763
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2099094190
Cited by
411
References
74
Citations by year
2026: 7 · 2025: 7 · 2024: 13 · 2023: 12 · 2022: 16 · 2021: 24 · 2020: 12 · 2019: 17 · 2018: 17 · 2017: 19 · 2016: 14 · 2015: 16 · 2014: 22 · 2013: 18 · 2012: 22
FWCI
7.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (submittedVersion)
Funders
  • Wellcome Trust
  • University of Bath
  • University of Birmingham
  • Cardiff University
Topics
  • Health Sciences › Medicine › Nephrology › Gout, Hyperuricemia, Uric Acid
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
xanthine oxidase, nitrite reduction, nitric oxide production, NADH, xanthine, enzyme inactivation, xanthine dehydrogenase, superoxide, anaerobic conditions, enzyme kinetics, pH optimum, oxygen partial pressure, bactericidal activity, gastrointestinal tract
MeSH terms
Anaerobiosis, Animals, Biphenyl Compounds, Cattle, Flavin-Adenine Dinucleotide, Flavoproteins, Kinetics, Metalloproteins, Milk, Molybdenum, NAD, Nitric Oxide, Nitrites, Onium Compounds, Oxidation-Reduction, Xanthine Dehydrogenase, Xanthine Oxidase, Xanthine, Catalytic Domain

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