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Multi-subunit acetyl-CoA carboxylases.

John E Cronan1, Grover L Waldrop

  • 1Department of Microbiology, B103 Chemical and Life Sciences Laboratory, University of Illinois, 601 S. Goodwin Avenue, Urbana, IL 61801, USA. j-cronan@life.uiuc.edu

Progress in Lipid Research
|July 18, 2002
PubMed
Summary

Acetyl-CoA carboxylase (ACC) enzymes are crucial for fatty acid synthesis. This review details the structures, regulation, and mechanisms of bacterial and plant multi-subunit ACCs (MS-ACCs).

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Acetyl-CoA carboxylase (ACC) catalyzes the rate-limiting step in fatty acid biosynthesis.
  • Two distinct ACC enzyme types exist: multi-subunit (MS-ACC) and single large polypeptide.
  • MS-ACCs are found in bacteria and plant chloroplasts, while single polypeptides are in mammals, fungi, and plant cytosols.

Purpose of the Study:

  • To review the structures, regulation, and enzymatic mechanisms of bacterial and plant MS-ACCs.
  • To provide a comprehensive overview of MS-ACC enzymology.

Main Methods:

  • Literature review of existing research on MS-ACCs.
  • Analysis of structural, regulatory, and mechanistic data from bacterial and plant ACC systems.

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Main Results:

  • Detailed description of the distinct subunit compositions and assembly of bacterial and plant MS-ACCs.
  • Elucidation of regulatory mechanisms controlling MS-ACC activity, including allosteric effectors and post-translational modifications.
  • Explanation of the catalytic mechanisms involved in acetyl-CoA carboxylation.

Conclusions:

  • Bacterial and plant MS-ACCs share conserved structural and mechanistic principles despite evolutionary divergence.
  • Understanding MS-ACC function is vital for metabolic engineering and drug development targeting fatty acid synthesis.