3-hydroxy-2-methylpyridine-4,5-dicarboxylate 4-decarboxylase
UniProtKB accession: Q988D0
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Go to UniProtKB: Q988D0
UniProtKB description: Involved in the catabolism of pyridoxal 5-phosphate (Vitamin B6). Catalyzes the decarboxylation of 3-hydroxy-2-methylpyridine-4,5-dicarboxylate to yield 3-hydroxy-2-methylpyridine-5-carboxylate. The decarboxylation proceeds by an aldolase-like mechanism in which the binding of the substrate frees Glu-73 residue from its interaction with manganese ion replacing it by an interaction with the hydroxyl group from the substrate. Glu-73 residue then provides the proton for the keto-enol tautomerization. The decarboxylation reaction is analogous to the retroaldol reaction except that it does not need a base as the carboxylate is likely to be deprotonated under the reaction conditions.
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