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Bacterial NADH-quinone oxidoreductases.

T Yagi1

  • 1Department of Molecular and Experimental Medicine, Research Institute of Scripps Clinic, La Jolla, California 92037.

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

Bacterial respiratory chains contain two types of NADH quinone oxidoreductases: NADH dehydrogenase 1 (NDH-1) with an energy-coupling site and NDH-2 without. This review discusses the significance of finding both NDH-1 and NDH-2 in a single bacterial strain.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Bacterial respiratory chains utilize NADH quinone oxidoreductases for energy production.
  • These enzymes are broadly classified into two groups: NADH dehydrogenase 1 (NDH-1) and NADH dehydrogenase 2 (NDH-2), distinguished by the presence or absence of an energy-coupling site.

Purpose of the Study:

  • To review the distinct biochemical properties and prosthetic groups of NDH-1 and NDH-2.
  • To discuss the implications of co-occurrence of both NDH-1 and NDH-2 within a single bacterial organism.

Main Methods:

  • Comparative analysis of enzyme structures and prosthetic groups (FMN, iron-sulfur clusters, FAD).
  • Review of inhibitor specificities for NDH-1 (rotenone, capsaicin, DCCD) versus NDH-2.
  • Examination of recent findings on the presence of both enzyme types in a single bacterial strain.

Main Results:

  • NDH-1 enzymes are typically multi-polypeptide complexes with FMN and iron-sulfur clusters, sensitive to specific inhibitors.
  • NDH-2 enzymes are generally single polypeptides with FAD, lacking iron-sulfur clusters and resistant to NDH-1 inhibitors.
  • Recent studies confirm the simultaneous presence of both NDH-1 and NDH-2 in certain bacterial species.

Conclusions:

  • The distinct characteristics of NDH-1 and NDH-2 suggest specialized roles within the bacterial respiratory chain.
  • The co-existence of both enzyme types in one bacterium may offer metabolic flexibility or adaptation advantages.
  • Further research is warranted to elucidate the functional significance and regulatory mechanisms of dual NADH dehydrogenase presence.

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