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Human cytochrome c oxidase: structure, function, and deficiency

¹Department of Clinical Neurosciences, Royal Free Hospital School of Medicine, London, United Kingdom.

Journal of Bioenergetics and Biomembranes

|April 1, 1997

Summary

Cytochrome c oxidase, vital for cellular energy, has nuclear-encoded subunits whose roles are poorly understood. Studying yeast models helps characterize enzyme deficiencies and their genetic causes.

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Area of Science:

Biochemistry
Molecular Biology
Genetics

Background:

Cytochrome c oxidase is the final enzyme in the mitochondrial respiratory chain, essential for cellular energy production.
The human enzyme comprises 13 subunits, with the catalytic core encoded by mitochondrial DNA (mtDNA) and others by the nuclear genome.
While structural data exists, the function of nuclear-encoded subunits remains largely unknown.

Purpose of the Study:

To investigate the poorly understood roles of nuclear-encoded subunits in human cytochrome c oxidase.
To utilize yeast as a model organism for studying cytochrome c oxidase assembly, structure, stability, and function.
To explore the genetic basis of cytochrome c oxidase deficiencies, including both mitochondrial and nuclear genome contributions.

Main Methods:

Analysis of primary sequences and crystal structures of cytochrome c oxidase.
Utilizing yeast as a model system to study enzyme assembly and function.
Employing pedigree analysis and cell fusion experiments to investigate genetic defects.

Main Results:

The catalytic core of human cytochrome c oxidase is mtDNA-encoded, while other subunits are nuclear-encoded.
Yeast serves as a valuable model for studying mutations affecting enzyme complex assembly, structure, stability, and function.
Cytochrome c oxidase deficiencies can result from mutations in either mitochondrial or nuclear DNA, or both.

Conclusions:

Understanding nuclear-encoded subunits is crucial for a complete picture of cytochrome c oxidase function.
Yeast models provide insights into the biogenesis of cytochrome c oxidase and the molecular basis of associated diseases.
Further molecular characterization of cytochrome c oxidase deficiencies is needed, building upon yeast-based research.

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