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Related Experiment Videos

Cytochrome oxidase assembly does not require catalytically active cytochrome C.

Antoni Barrientos1, Danielle Pierre, Johnson Lee

  • 1Department of Biological Sciences, Columbia University, New York, New York, 10027, USA.

The Journal of Biological Chemistry
|January 11, 2003
PubMed
Summary

Cytochrome c is essential for assembling cytochrome c oxidase (COX) in yeast, but its role is structural, not functional. Even catalytically inactive cytochrome c aids COX assembly, highlighting its importance in enzyme maturation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Respiration

Background:

  • Cytochrome c oxidase (COX) is the final enzyme in the mitochondrial respiratory chain, crucial for ATP production.
  • COX assembly involves nuclear and mitochondrial gene products, with cytochrome c's role in this process being unclear.
  • Cytochrome c, encoded by CYC1 and CYC7 in yeast, is known for electron transfer and its potential role in COX assembly.

Purpose of the Study:

  • To investigate whether cytochrome c plays a functional or structural role in COX assembly.
  • To differentiate between the electron transfer activity and structural contribution of cytochrome c to COX.

Main Methods:

  • Utilized a Saccharomyces cerevisiae cyc1/cyc7 double null mutant.
  • Transformed the mutant with a cyc1-166 gene expressing catalytically inactive iso-1-cytochrome c.

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  • Characterized COX content spectrally, functionally, and immunochemically.

    • Main Results:

    • Catalytically inactive cytochrome c was sufficient for COX assembly.
    • Cytochrome c appears to play a structural role in COX assembly rather than a functional one.
    • Wild-type apocytochrome c in mitochondria without COX suggests that only folded, mature cytochrome c promotes COX assembly.

    Conclusions:

    • Cytochrome c is structurally required for cytochrome c oxidase assembly in yeast.
    • The mature, folded form of cytochrome c is necessary for promoting COX assembly.
    • Cytochrome c's role in COX assembly is primarily structural, independent of its electron transfer function.