Homologous (beta/alpha)8-barrel enzymes that catalyze unrelated reactions: orotidine 5'-monophosphate decarboxylase and 3-keto-L-gulonate 6-phosphate decarboxylase

Biochemistry
Eric L WiseIvan Rayment

Abstract

The 3-keto-L-gulonate 6-phosphate decarboxylase (KGPDC) encoded by the ulaD gene in the Escherichia coli genome [Yew, W. S., and Gerlt, J. A. (2002) J. Bacteriol. 184, 302-306] and orotidine 5'-monophosphate decarboxylase (OMPDC) are homologous (derived from a common ancestor) but catalyze different reactions. The metal-independent decarboxylation reaction catalyzed by OMPDC avoids the formation of a vinyl anion intermediate; the Mg2+-dependent decarboxylation reaction catalyzed by KGPDC involves the formation of an enediolate anion intermediate. Based on the available structures of OMPDC, a sequence alignment allows the predictions that (1) KGPDC is a dimer of (beta/alpha)8-barrels, with the active sites located at the dimer interface; (2) KGPDC and OMPDC share an aspartate residue at the end of the first beta-strand and an Asp-x-Lys-x-x-Asp motif at the end of the third beta-strand with OMPDC; but (3) KGPDC has a Glu instead of a Lys at the end of the second beta-strand. The structure of KGPDC has been determined in the presence of Mg2+ and the substrate analogue L-gulonate 6-phosphate and confirms these predictions. The carboxylate functional groups at the ends of the first, second, and third beta-strands in KGPDC are ligand...Continue Reading

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