Purification and properties of oxaloacetate decarboxylase from Corynebacterium glutamicum

Antonie Van Leeuwenhoek. 1995;67(2):221-7. doi: 10.1007/BF00871217.

Abstract

Oxaloacetate (OAA) decarboxylase (E.C. 4.1.1.3) was isolated from Corynebacterium glutamicum. In five steps the enzyme was purified 300-fold to apparent homogeneity. The molecular mass estimated by gel filtration was 118 +/- 6 kDa. SDS-PAGE showed a single subunit of 31.7 KDa, indicating an alpha 4 subunit structure for the native enzyme. The enzyme catalyzed the decarboxylation of OAA to pyruvate and CO2, but no other alpha-ketoacids were used as substrate. The cation Mn2+ was required for full activity, but could be substituted by Mg2+, CO2+, Ni2+ and Ca2+. Monovalent ions like Na+, K+ or NH4+ were not required for activity. The enzyme was inhibited by Cu2+, Zn2+, ADP, coenzyme A and succinate. Avidin did not inhibit the enzyme activity, indicating that biotin is not involved in decarboxylation of OAA. Analysis of the kinetic properties revealed a Km for OAA of 2.1 mM and a Km of 1.2 mM for Mn2+. The Vmax was 158 mumol of OAA converted per min per mg of protein, which corresponds to an apparent kcat of 311 s-1.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carboxy-Lyases / antagonists & inhibitors
  • Carboxy-Lyases / chemistry
  • Carboxy-Lyases / isolation & purification
  • Carboxy-Lyases / metabolism*
  • Cations / metabolism
  • Corynebacterium / enzymology*
  • Electrophoresis, Polyacrylamide Gel
  • Kinetics
  • Manganese / metabolism
  • Molecular Weight
  • Pyruvate Kinase / metabolism
  • Substrate Specificity

Substances

  • Cations
  • Manganese
  • Pyruvate Kinase
  • Carboxy-Lyases
  • oxaloacetate decarboxylase