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Related Experiment Videos

Functional and evolutionary relationships among diverse oxygenases.

S Harayama1, M Kok, E L Neidle

  • 1Department of Medical Biochemistry, University of Geneva, Switzerland.

Annual Review of Microbiology
|January 1, 1992
PubMed
Summary

This review covers bacterial oxygenases, enzymes that use dioxygen for metabolic pathways. It details monooxygenases and dioxygenases involved in hydrocarbon degradation, highlighting their cofactors and reaction mechanisms.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Microbial Metabolism

Background:

  • Oxygenases are crucial enzymes in metabolic pathways, utilizing dioxygen for substrate modification.
  • Bacterial oxygenases, particularly those in hydrocarbon degradation, play a significant role in environmental processes.

Purpose of the Study:

  • To review representative bacterial oxygenases involved in hydrocarbon degradation.
  • To discuss the mechanisms of monooxygenases and dioxygenases, including their cofactor requirements and reaction pathways.

Main Methods:

  • Review of literature on bacterial oxygenases.
  • Detailed discussion of monooxygenase and dioxygenase enzyme classes.
  • Analysis of cofactor interactions and electron transport mechanisms.

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Main Results:

  • Monooxygenases incorporate one hydroxyl group, requiring NAD(P)H.
  • Dioxygenases incorporate two hydroxyl groups (aromatic-ring dioxygenases) or cleave the aromatic ring (aromatic-ring-cleavage dioxygenases).
  • All oxygenases utilize cofactors (metal, flavin, pteridine) to overcome spin restrictions in dioxygen reactions.

Conclusions:

  • Oxygenase mechanisms involve cofactors to facilitate dioxygen reactions.
  • NAD(P)H-dependent oxygenases often separate substrate oxidation and hydroxylation steps.
  • Sequence analysis reveals conserved regions for cofactor binding, enabling oxygenase classification into families.