, Volume 32, Issue 5, pp 701-705

Regioselective carboxylation of catechol by 3,4-dihydroxybenzoate decarboxylase of Enterobacter cloacae P

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Abstract

3,4-Dihydroxybenzoate decarboxylase in Enterobacter cloacae P241 was induced by adding 3,4-dihydroxybenzoic acid, 3-hydroxybenzoic acid, 3,4,5-trihydroxybenzoic acid or 4-acetamidobenzoic acid to the culture medium. After stabilizing the enzyme activity by adding 5 mM dithiothreitol and 20 mM Na2S2O3 to a cell-free extract, catechol at 50 mM was carboxylated in the presence of 3 M KHCO3 to 3,4-dihydroxybenzoic acid with a molar conversion ratio of 28% after 14 h at 30°C.