Overproduction, purification and properties of 2,3-dihydroxyphenylpropionate 1,2-dioxygenase from Escherichia coli.
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.
Department of Chemistry, University of Southampton, UK.
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D000595:Amino Acid Sequence; D001205:Ascorbic Acid; D003001:Cloning, Molecular; D049308:Dioxygenases; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D010105:Oxygenases / Q000096:biosynthesis* / Q000737:chemistry / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000096:biosynthesis*; D013379:Substrate Specificity
D011994:Recombinant Proteins; D010105:Oxygenases; D049308:Dioxygenases; C083582:3-carboxyethylcatechol 2,3-dioxygenase; D001205:Ascorbic Acid