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Related Experiment Videos

Nitric oxide and the respiratory enzyme.

Maurizio Brunori1, Elena Forte, Marzia Arese

  • 1Department of Biochemical Sciences and CNR Institute of Molecular Biology and Pathology, University of Rome La Sapienza, I-00185 Rome, Italy. maurizio.brunori@uniroma1.it

Biochimica Et Biophysica Acta
|June 24, 2006
PubMed
Summary

Nitric oxide (NO) reversibly inhibits cytochrome-c-oxidase, a key respiratory enzyme, through two distinct molecular pathways. These reactions depend on electron flux and may have physiological or pathological implications.

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Area of Science:

  • Biochemistry
  • Cellular Respiration
  • Enzymology

Background:

  • Nitric oxide (NO) is a critical signaling molecule.
  • Cytochrome-c-oxidase is the terminal enzyme of the mitochondrial respiratory chain.
  • The interaction between NO and cytochrome-c-oxidase is complex and not fully understood.

Purpose of the Study:

  • To review existing knowledge on NO's control over cytochrome-c-oxidase activity.
  • To elucidate the molecular mechanisms of NO inhibition on cytochrome-c-oxidase.
  • To explore potential physiological and pathological consequences of NO-cytochrome-c-oxidase interactions.

Main Methods:

  • Literature review of molecular mechanisms.
  • Analysis of reaction pathways involving NO and heme a3.

Related Experiment Videos

  • Hypothesis-driven discussion of physiological and pathological effects.

    • Main Results:

    • NO reversibly inhibits cytochrome-c-oxidase at physiological concentrations.
    • Two distinct reaction pathways are identified, dependent on electron flux.
    • These pathways yield either a nitrosyl- or a nitrite-heme a3 derivative.

    Conclusions:

    • NO modulates cytochrome-c-oxidase activity via specific molecular mechanisms.
    • The dual inhibition pathways offer new insights into cellular respiration control.
    • Further research is warranted to understand the in vivo relevance of these NO-cytochrome-c-oxidase interactions.