Overproduction, purification and properties of 2,3-dihydroxyphenylpropionate 1,2-dioxygenase from Escherichia coli

Biochim Biophys Acta. 1993 Oct 6;1202(2):258-64. doi: 10.1016/0167-4838(93)90013-h.


The mhpB gene encoding 2,3-dihydroxyphenylpropionate 1,2-dioxygenase in Escherichia coli was subcloned from Clarke-Carbon plasmid pLC20-30 by complementation with an mhpB- strain LW366. Dioxygenase MhpB was purified using a five-step procedure from an overexpressing construct containing the mhpB gene, giving enzyme of > 95% homogeneity. The purified enzyme appeared as a 36-kDa subunit by SDS-PAGE, and had a native molecular mass of 134 kDa as determined by gel filtration. The apoenzyme obtained after chromatography could be re-activated by addition of Fe(II) and ascorbate to give the holoenzyme with a specific activity of 48 U/mg, which could be readily inactivated by oxidation or complexation of the Fe(II) cofactor, or simply by dilution. The substrate specificity of MhpB was examined, and as well as 2,3-dihydroxyphenylpropionate the enzyme was found to catalyse meta-ring cleavage of 3-methylcatechol and catechol, with reduced catalytic efficiency. The N-terminal sequence obtained for the purified enzyme showed significant sequence similarity with catechol 2,3-dioxygenase from Alcaligenes eutrophus, but none with catechol 2,3-dioxygenases from Pseudomonas.

MeSH terms

  • Amino Acid Sequence
  • Ascorbic Acid
  • Cloning, Molecular
  • Dioxygenases*
  • Escherichia coli / enzymology*
  • Escherichia coli / genetics
  • Molecular Sequence Data
  • Oxygenases / biosynthesis*
  • Oxygenases / chemistry
  • Oxygenases / isolation & purification
  • Recombinant Proteins / biosynthesis*
  • Substrate Specificity


  • Recombinant Proteins
  • Oxygenases
  • Dioxygenases
  • 3-carboxyethylcatechol 2,3-dioxygenase
  • Ascorbic Acid