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Cytochrome c oxidase metal centers: location and function.

M Müller1, A Azzi

  • 1Institut für Biochemie und Molekularbiologie der Universität Bern, Switzerland.

Journal of Bioenergetics and Biomembranes
|April 1, 1991
PubMed
Summary

Paracoccus denitrificans cytochrome c oxidase, similar to mammalian enzymes, has a simpler structure. This allows for better understanding of how metal centers bind to its polypeptide structure.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Cytochrome c oxidase is crucial for cellular respiration.
  • The enzyme's structure-function relationship is key to understanding electron transport.
  • Paracoccus denitrificans offers a simpler model system compared to mammalian enzymes.

Purpose of the Study:

  • To investigate the structural basis of metal center binding in Paracoccus denitrificans cytochrome c oxidase.
  • To compare the structural features of the bacterial enzyme with its mammalian counterparts.
  • To refine models of active metal center-polypeptide interactions.

Main Methods:

  • Spectroscopic analysis of enzyme activity.
  • Functional characterization of Paracoccus denitrificans cytochrome c oxidase.
  • Comparative sequence analysis with other species.
  • Controlled proteolytic digestion experiments.

Main Results:

  • Paracoccus denitrificans cytochrome c oxidase exhibits functional and spectroscopic similarities to mammalian enzymes.
  • The bacterial enzyme possesses a simpler quaternary structure (three subunits) compared to the bovine enzyme (13 subunits).
  • Structural constraints for metal center binding were identified based on primary structure and proteolytic digestion data.

Conclusions:

  • The simpler structure of Paracoccus denitrificans cytochrome c oxidase facilitates detailed structural studies.
  • Understanding bacterial enzyme structure aids in elucidating conserved mechanisms in mammalian cytochrome c oxidase.
  • The findings provide a basis for improved models of metal-ligand interactions in respiratory enzymes.

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