Cited by 4,110Nitric Oxide and Endothelin EffectsHemoglobin structure and functionMetal-Catalyzed Oxygenation Mechanisms

Nitric oxide synthases: structure, function and inhibition

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ALDERTON, Wendy K., COOPER, Chris E., KNOWLES, Richard G.·2001·Biochemical Journal

Abstract

This review concentrates on advances in nitric oxide synthase (NOS) structure, function and inhibition made in the last seven years, during which time substantial advances have been made in our understanding of this enzyme family. There is now information on the enzyme structure at all levels from primary (amino acid sequence) to quaternary (dimerization, association with other proteins) structure. The crystal structures of the oxygenase domains of inducible NOS (iNOS) and vascular endothelial NOS (eNOS) allow us to interpret other information in the context of this important part of the enzyme, with its binding sites for iron protoporphyrin IX (haem), biopterin, l-arginine, and the many inhibitors which interact with them. The exact nature of the NOS reaction, its mechanism and its products continue to be sources of controversy. The role of the biopterin cofactor is now becoming clearer, with emerging data implicating one-electron redox cycling as well as the multiple allosteric effects on enzyme activity. Regulation of the NOSs has been described at all levels from gene transcription to covalent modification and allosteric regulation of the enzyme itself. A wide range of NOS inhibitors have been discussed, interacting with the enzyme in diverse ways in terms of site and mechanism of inhibition, time-dependence and selectivity for individual isoforms, although there are many pitfalls and misunderstandings of these aspects. Highly selective inhibitors of iNOS versus eNOS and neuronal NOS have been identified and some of these have potential in the treatment of a range of inflammatory and other conditions in which iNOS has been implicated.

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Crossref · 10.1042/bj3570593

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Authors
ALDERTON, W. K., COOPER, C. E., & KNOWLES, R. G.
Affiliations
  • GlaxoSmithKline (United Kingdom) (GB)
  • University of Essex (GB)
Venue
Biochemical Journal
Published
2001-07-25
Volume
357
Issue
3
Pages
593-615
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2115153703
Cited by
4,110
References
0
Citations by year
2026: 57 · 2025: 89 · 2024: 100 · 2023: 121 · 2022: 137 · 2021: 128 · 2020: 149 · 2019: 142 · 2018: 145 · 2017: 172 · 2016: 176 · 2015: 174 · 2014: 187 · 2013: 203 · 2012: 227
FWCI
16.66
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
nitric oxide synthase, inducible nitric oxide synthase, endothelial nitric oxide synthase, neuronal nitric oxide synthase, enzyme structure, oxygenase domain, heme binding, enzyme mechanism, allosteric regulation, enzyme inhibition, isoform-selective inhibitors
MeSH terms
Animals, Catalysis, Humans, Isoenzymes, Models, Molecular, Nitric Oxide, Gene Expression Regulation, Enzymologic, Alternative Splicing, Protein Structure, Tertiary, Nitric Oxide Synthase, Dimerization

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