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Biocatalytic asymmetric decarboxylation

H Ohta1

  • 1Department of Chemistry, Keio University, Yokohama, Japan. hohta@chem.keio.ac.jp

Advances in Biochemical Engineering/Biotechnology
|February 6, 1999
PubMed
Summary

This study reveals a novel biocatalytic decarboxylation method using an Alcaligenes bronchisepticus enzyme to produce optically active compounds. The enzyme uniquely facilitates asymmetric decarboxylation without common cofactors, highlighting a Cys residue

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Enzymology

Background:

  • Biocatalytic decarboxylation is a unique reaction.
  • Optically active compounds are valuable in synthesis.
  • Asymmetric synthesis via biotransformation offers distinct advantages over traditional organic reactions.

Purpose of the Study:

  • To investigate the asymmetric decarboxylation of alpha-aryl-alpha-methylmalonic acid.
  • To characterize the enzyme responsible for this biotransformation.
  • To elucidate the reaction mechanism and identify key residues.

Main Methods:

  • Enzyme isolation from Alcaligenes bronchisepticus.
  • Asymmetric decarboxylation assays.
  • Inhibitor studies and spectroscopic analysis.
  • Kinetic data analysis.

Main Results:

  • An enzyme from Alcaligenes bronchisepticus catalyzes asymmetric decarboxylation.
  • Optically active alpha-arylpropionic acids are produced.
  • The enzyme does not require biotin, co-enzyme A, or ATP.
  • Spectroscopic analysis and inhibitor studies indicate an essential role for a Cys residue.

Conclusions:

  • A novel biocatalytic route for synthesizing optically active alpha-arylpropionic acids has been established.
  • The enzyme's unique cofactor-independent mechanism and reliance on a Cys residue are significant findings.
  • This biotransformation represents a characteristic and valuable synthetic method.

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