Abstract
A nonoxidative decarboxylase, 2,6-dihydroxybenzoate decarboxylase, was found in Agrobacterium tumefaciens IAM12048. The enzyme activity was induced specifically by 2,6-dihydroxybenzoate. The purified enzyme was a homotetramer of identical 38 kDa subunits. The purified decarboxylase catalyzed the nonoxidative decarboxylation of 2,6-dihydroxybenzoate and 2,3-dihydroxybenzoate without requiring any cofactors. In the presence of KHCO(3), the enzyme also catalyzed the regioselective carboxylation of 1,3-dihydroxybenzene into 2,6-dihydroxybenzoate at a molar conversion ratio of 30%.
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