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Prokaryotic carbonic anhydrases.

K S Smith1, J G Ferry

  • 1Department of Biochemistry and Molecular Biology, 204 South Frear Laboratory, The Pennsylvania State University, University Park, PA 16802, USA. kss9@psu.edu

FEMS Microbiology Reviews
|September 9, 2000
PubMed
Summary

Carbonic anhydrases, crucial for CO(2) hydration, are widespread in prokaryotes, with multiple gene classes indicating fundamental roles. Further research will uncover novel functions for this enzyme in bacteria and archaea.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Microbiology

Background:

  • Carbonic anhydrases (CAs) are zinc metalloenzymes catalyzing CO(2) hydration, essential in eukaryotic physiology.
  • While abundant in eukaryotes, CAs were historically understudied in prokaryotes (Bacteria and Archaea).

Purpose of the Study:

  • To highlight the widespread presence and fundamental role of carbonic anhydrases in prokaryotic biology.
  • To discuss the three distinct CA classes (alpha, beta, gamma) and their distribution in prokaryotes.
  • To emphasize the implications of multiple CA genes in prokaryotes and the need for further functional studies.

Main Methods:

  • Literature review of existing studies on carbonic anhydrase distribution and function.
  • Comparative analysis of CA gene classes (alpha, beta, gamma) across prokaryotic domains.
  • Synthesis of current knowledge on prokaryotic CA roles, including CO(2) fixation and other functions.

Main Results:

  • Carbonic anhydrase is widespread in diverse prokaryotic species from both Bacteria and Archaea domains.
  • Prokaryotes possess genes from all three CA classes, with beta and gamma predominating.
  • Many prokaryotes contain multiple CA genes, sometimes from different classes, underscoring enzyme importance.

Conclusions:

  • The discovery of CAs in prokaryotes reveals a more extensive role than previously recognized.
  • Prokaryotic CAs, particularly beta and gamma classes, are evolutionarily significant and functionally diverse.
  • Future research on prokaryotic carbonic anhydrases is expected to uncover novel functions and biological roles.

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