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Sodium ion-translocating decarboxylases.

W Buckel1

  • 1Laboratorium für Mikrobiologie, Fachbereich Biologie, Philipps-Universität, D-35032, Marburg, Germany. buckel@mailer.uni-marburg.de

Biochimica Et Biophysica Acta
|March 15, 2001
PubMed
Summary

Three Na(+)-dependent biotin decarboxylases use a sodium ion gradient to drive decarboxylation reactions. This mechanism is crucial for energy generation in some bacteria, particularly in high-sodium environments like seawater.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Structural Biology

Background:

  • Focuses on three Na(+)-dependent biotin-containing decarboxylases: oxaloacetate decarboxylase, methylmalonyl-CoA decarboxylase, and glutaconyl-CoA decarboxylase.
  • These enzymes are crucial for energy metabolism in certain bacteria, utilizing a unique decarboxylation mechanism.

Purpose of the Study:

  • To review the structure and function of Na(+)-dependent biotin-containing decarboxylases.
  • To elucidate the mechanism of CO(2) substitution by H(+) and the generation of sodium ion gradients.
  • To discuss the implications of these enzymes for microbial life in high-sodium environments.

Main Methods:

  • Review of existing literature on Na(+)-dependent biotin-containing decarboxylases.
  • Analysis of enzyme structure, including functional domains and membrane-spanning helices.
  • Examination of the catalytic mechanism involving N-carboxybiotin intermediate and sodium ion translocation.

Main Results:

  • Decarboxylases are complex enzymes with four functional domains, including a carboxytransferase and a Na(+)-dependent carboxybiotin decarboxylase.
  • The decarboxylation reaction couples substrate decarboxylation to the translocation of Na(+) ions, generating an electrochemical gradient.
  • At high sodium concentrations, these enzymes may facilitate Na(+)/Na(+) exchange, impacting ATP synthesis via Delta(mu)Na(+) in organisms like Propiogenium modestum.

Conclusions:

  • Na(+)-dependent biotin decarboxylases play a vital role in microbial energy metabolism by coupling decarboxylation to ion transport.
  • The ability to utilize sodium gradients is essential for bacteria inhabiting high-salinity environments.
  • Homologues of these decarboxylases are widespread in sequenced bacterial and archaeal genomes, indicating their evolutionary significance.

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