Cited by 176Mitochondrial Function and PathologyNitric Oxide and Endothelin EffectsMetal-Catalyzed Oxygenation Mechanisms

Nitric oxide regulation of mitochondrial oxygen consumption II: molecular mechanism and tissue physiology

Cooper, Chris E., Giulivi, Cecilia·2007·American Journal of Physiology-Cell Physiology

Abstract

Nitric oxide (NO) is an intercellular signaling molecule; among its many and varied roles are the control of blood flow and blood pressure via activation of the heme enzyme, soluble guanylate cyclase. A growing body of evidence suggests that an additional target for NO is the mitochondrial oxygen-consuming heme/copper enzyme, cytochrome c oxidase. This review describes the molecular mechanism of this interaction and the consequences for its likely physiological role. The oxygen reactive site in cytochrome oxidase contains both heme iron ( a 3) and copper (Cu B) centers. NO inhibits cytochrome oxidase in both an oxygen-competitive (at heme a 3) and oxygen-independent (at Cu B) manner. Before inhibition of oxygen consumption, changes can be observed in enzyme and substrate (cytochrome c) redox state. Physiological consequences can be mediated either by direct “metabolic” effects on oxygen consumption or via indirect “signaling” effects via mitochondrial redox state changes and free radical production. The detailed kinetics suggest, but do not prove, that cytochrome oxidase can be a target for NO even under circumstances when guanylate cyclase, its primary high affinity target, is not fully activated. In vivo organ and whole body measures of NO synthase inhibition suggest a possible role for NO inhibition of cytochrome oxidase. However, a detailed mapping of NO and oxygen levels, combined with direct measures of cytochrome oxidase/NO binding, in physiology is still awaited.

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Crossref · 10.1152/ajpcell.00310.2006

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Authors
Cooper, C. E., & Giulivi, C.
Affiliations
University of Essex (GB)
Venue
American Journal of Physiology-Cell Physiology
Published
2007-06
Volume
292
Issue
6
Pages
C1993-C2003
ISSN
  • 0363-6143 (ISSN-L)
  • 1522-1563
OpenAlex
W2142137775
Cited by
176
References
96
Citations by year
2026: 3 · 2025: 6 · 2024: 9 · 2023: 4 · 2022: 1 · 2021: 5 · 2020: 3 · 2019: 2 · 2018: 7 · 2017: 8 · 2016: 7 · 2015: 15 · 2014: 12 · 2013: 16 · 2012: 11
FWCI
1.31
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Cell Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust (069769)
  • Biotechnology and Biological Sciences Research Council (BB/D017858/1)
  • National Institute of Environmental Health Sciences (ES-005707)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
nitric oxide, cytochrome c oxidase, mitochondrial oxygen consumption, heme a3, mitochondrial redox signaling, free radical generation, soluble guanylate cyclase, NO synthase inhibition, tissue physiology
MeSH terms
Animals, Mitochondria, Models, Biological, Nitric Oxide, Oxygen

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