Cited by 75Metalloenzymes and iron-sulfur proteinsMetal-Catalyzed Oxygenation MechanismsEnzyme Structure and Function

Nitrite reduction by xanthine oxidase family enzymes: a new class of nitrite reductases

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Maia, Luisa B., Moura, José J. G.·2011·JBIC Journal of Biological Inorganic Chemistry

Abstract

Mammalian xanthine oxidase (XO) and Desulfovibrio gigas aldehyde oxidoreductase (AOR) are members of the XO family of mononuclear molybdoenzymes that catalyse the oxidative hydroxylation of a wide range of aldehydes and heterocyclic compounds. Much less known is the XO ability to catalyse the nitrite reduction to nitric oxide radical (NO). To assess the competence of other XO family enzymes to catalyse the nitrite reduction and to shed some light onto the molecular mechanism of this reaction, we characterised the anaerobic XO- and AOR-catalysed nitrite reduction. The identification of NO as the reaction product was done with a NO-selective electrode and by electron paramagnetic resonance (EPR) spectroscopy. The steady-state kinetic characterisation corroborated the XO-catalysed nitrite reduction and demonstrated, for the first time, that the prokaryotic AOR does catalyse the nitrite reduction to NO, in the presence of any electron donor to the enzyme, substrate (aldehyde) or not (dithionite). Nitrite binding and reduction was shown by EPR spectroscopy to occur on a reduced molybdenum centre. A molecular mechanism of AOR- and XO-catalysed nitrite reduction is discussed, in which the higher oxidation states of molybdenum seem to be involved in oxygen-atom insertion, whereas the lower oxidation states would favour oxygen-atom abstraction. Our results define a new catalytic performance for AOR-the nitrite reduction-and propose a new class of molybdenum-containing nitrite reductases.

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  • The flavoprotein domain binds the cofactor FAD and includes a binding site for NADPH.

    “The transmembrane domain includes four conserved histidines that serve as binding sites for two heme moieties bound between helices III and V (288, 613), and the flavoprotein domain binds the cofactor FAD and includes a binding site for NADPH (49, 480, 613, 980).”
  • The transmembrane domain includes four conserved histidines that serve as binding sites for two heme moieties bound between helices III and V.

    “The transmembrane domain includes four conserved histidines that serve as binding sites for two heme moieties bound between helices III and V (288, 613), and the flavoprotein domain binds the cofactor FAD and includes a binding site for NADPH (49, 480, 613, 980).”
  • The crystal structure of NOX5 has been determined and is consistent with the presence of six transmembrane α helices with five connecting loops.

    “Recently, the crystal structure of a NOX core subunit (NOX5) has been determined (613). This structure is consistent with previous evidence suggesting the presence of six transmembrane α helices with five connecting loops (FIGURE 7) (613).”

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Authors
Maia, L. B., & Moura, J. J. G.
Affiliations
Universidade Nova de Lisboa (PT)
Corresponding author
Moura, José J. G.
Venue
JBIC Journal of Biological Inorganic Chemistry
Published
2010-12-19
Volume
16
Issue
3
Pages
443-460
ISSN
  • 0949-8257 (ISSN-L)
  • 1432-1327
OpenAlex
W1971908845
Cited by
75
References
72
Citations by year
2026: 4 · 2025: 3 · 2024: 2 · 2023: 5 · 2022: 4 · 2021: 3 · 2020: 3 · 2019: 2 · 2018: 9 · 2017: 6 · 2016: 3 · 2015: 7 · 2014: 9 · 2013: 6 · 2012: 5
FWCI
2.09
Type
journal article
Language
en
Open access
Locations
  • JBIC Journal of Biological Inorganic Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT) (submittedVersion, other-oa)
Funders
Ministério da Ciência, Tecnologia e Ensino Superior
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
nitrite reduction, xanthine oxidase, aldehyde oxidoreductase, Desulfovibrio gigas, molybdenum enzymes, nitric oxide radical, nitrite reductase, molybdenum oxidation state, enzyme kinetics, nitrite binding
MeSH terms
Aldehyde Oxidoreductases, Electron Spin Resonance Spectroscopy, Models, Biological, Nitrite Reductases, Nitrites, Oxidation-Reduction, Xanthine Oxidase

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