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Plant biotin-containing carboxylases.

Basil J Nikolau1, John B Ohlrogge, Eve Syrkin Wurtele

  • 1Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA. dimmas@iastate.edu <dimmas@iastate.edu>

Archives of Biochemistry and Biophysics
|June 5, 2003
PubMed
Summary

Plants utilize five key biotin-dependent carboxylases for essential metabolic processes, including fatty acid synthesis and leucine catabolism. This review highlights recent advances in understanding these vital plant proteins.

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Area of Science:

  • Plant biochemistry
  • Metabolomics
  • Enzymology

Background:

  • Biotin-containing proteins are crucial enzymes involved in carboxylation reactions central to metabolism across all life forms.
  • Plants possess five characterized biotin-dependent proteins, including two types of acetyl-CoA carboxylases, 3-methylcrotonyl-CoA carboxylase, and geranoyl-CoA carboxylase.
  • A noncatalytic biotin protein in plant seeds is hypothesized to function in biotin storage.

Purpose of the Study:

  • To summarize recent developments in the structure, regulation, and metabolic functions of biotin-containing proteins in plants.
  • To elucidate the roles of specific biotin-dependent carboxylases in plant metabolic pathways.
  • To provide an overview of the current understanding of plant biotin metabolism.

Main Methods:

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  • Literature review of recent research on plant biotin-containing proteins.
  • Analysis of characterized enzymes: heteromeric and homomeric acetyl-CoA carboxylases, 3-methylcrotonyl-CoA carboxylase, and geranoyl-CoA carboxylase.
  • Discussion of the metabolic roles and regulation of these proteins.

Main Results:

  • Acetyl-CoA carboxylases produce distinct malonyl-CoA pools in plastids (fatty acid biosynthesis) and cytosol (fatty acid elongation, secondary metabolites).
  • 3-Methylcrotonyl-CoA carboxylase is involved in the mitochondrial leucine catabolism pathway.
  • The precise metabolic role of geranoyl-CoA carboxylase remains under investigation, with potential links to isoprenoid metabolism.

Conclusions:

  • Significant progress has been made in understanding the structure, regulation, and diverse metabolic functions of biotin-containing proteins in plants.
  • These proteins play critical roles in fundamental plant metabolic processes, from fatty acid synthesis to secondary metabolism.
  • Further research is needed to fully elucidate the function of geranoyl-CoA carboxylase and the noncatalytic biotin storage protein.