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Related Experiment Videos

Cytochrome c-cytochrome oxidase interaction at subzero temperatures.

B Chance, C Saronio, A Waring

    Biochimica Et Biophysica Acta
    |July 6, 1978
    PubMed
    Summary

    Cytochrome oxidase forms two compounds with oxygen at low temperatures. Compound B

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Mitochondrial respiration

    Background:

    • Cytochrome oxidase is a key enzyme in the electron transport chain.
    • Oxygen forms distinct compounds with cytochrome oxidase at low temperatures.

    Purpose of the Study:

    • To investigate the functional role of peroxycytochrome oxidase (Compound B) in cytochrome c oxidation.
    • To explore the mechanism of cytochrome c oxidation at low temperatures.

    Main Methods:

    • Low-temperature spectroscopy to characterize oxygenated cytochrome oxidase compounds.
    • Kinetic studies using mitochondrial preparations with varying cytochrome c content.

    Main Results:

    • The rate of cytochrome c oxidation depends on a fluid phase near the enzyme.
    • Cytochrome c oxidation kinetics are linked to a slowly reacting component of cytochrome oxidase.
    • At very low temperatures, cytochrome c oxidation can precede the reaction of this component, suggesting alternative pathways.

    Conclusions:

    • Peroxycytochrome oxidase (Compound B) plays a role in cytochrome c oxidation.
    • A fluid phase is crucial for efficient electron transfer.
    • At low temperatures, electron tunneling may facilitate cytochrome c oxidation independently of cytochrome a.

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