Archives of Microbiology

, Volume 186, Issue 1, pp 21–29

Purification, characterization, and gene cloning of 4-hydroxybenzoate decarboxylase of Enterobacter cloacae P240

  • Tsuyoshi Matsui
  • Toyokazu Yoshida
  • Toshihisa Hayashi
  • Toru Nagasawa
Original Paper

Abstract

We found the occurrence of 4-hydroxybenzoate decarboxylase in Enterobacter cloacae P240, isolated from soils under anaerobic conditions, and purified the enzyme to homogeneity. The purified enzyme was a homohexamer of identical 60 kDa subunits. The purified decarboxylase catalyzed the nonoxidative decarboxylation of 4-hydroxybenzoate without requiring any cofactors. Its Km value for 4-hydroxybenzoate was 596 μM. The enzyme also catalyzed decarboxylation of 3,4-dihydroxybenzoate, for which the Km value was 6.80 mM. In the presence of 3 M KHCO3 and 20 mM phenol, the decarboxylase catalyzed the reverse carboxylation reaction of phenol to form 4-hydroxybenzoate with a molar conversion yield of 19%. The Km value for phenol was calculated to be 14.8 mM. The gene encoding the 4-hydroxybenzoate decarboxylase was isolated from E. cloacae P240. Nucleotide sequencing of recombinant plasmids revealed that the 4-hydroxybenzoate decarboxylase gene codes for a 475-amino-acid protein. The amino acid sequence of the enzyme is similar to those of 4-hydroxybenzoate decarboxylase of Clostridium hydroxybenzoicum (53% identity), VdcC protein (vanillate decarboxylase) of Streptomyces sp. strain D7 (72%) and 3-octaprenyl-4-hydroxybenzoate decarboxylase of Escherichia coli (28%). The hypothetical proteins, showing 96–97% identities to the primary structure of E. cloacae P240 4-hydroxybenzoate decarboxylase, were found in several bacterial strains.

Keywords

4-Hydroxybenzoate decarboxylase 4-Hydroxybenzoate Decarboxylation Carboxylation Enterobacter cloacae P240 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Tsuyoshi Matsui
    • 1
  • Toyokazu Yoshida
    • 1
  • Toshihisa Hayashi
    • 1
  • Toru Nagasawa
    • 1
  1. 1.Department of Biomolecular ScienceGifu University GifuJapan

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