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- W2017403840 abstract "Orotidine 5‘-monophosphate decarboxylase (ODCase) catalyzes the decarboxylation of orotidine 5‘-monophosphate, the last step in the de novo synthesis of uridine 5‘-monophosphate. ODCase is a very proficient enzyme [Radzicka, A., and Wolfenden, R. (1995) Science 267, 90−93], enhancing the reaction rate by a factor of 1017. This proficiency has been enigmatic, since it is achieved without metal ions or cofactors. Here we present a 2.5 Å resolution structure of ODCase complexed with the inhibitor 1-(5‘-phospho-β-d-ribofuranosyl)barbituric acid. It shows a closely packed dimer composed of two α/β-barrels with two shared active sites. The orientation of the orotate moiety of the substrate is unambiguously deduced from the structure, and previously proposed catalytic mechanisms involving protonation of O2 or O4 can be ruled out. The proximity of the OMP carboxylate group with Asp71 appears to be instrumental for the decarboxylation of OMP, either through charge repulsion or through the formation of a very short O···H···O hydrogen bond between the two carboxylate groups." @default.
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- W2017403840 date "2000-03-23" @default.
- W2017403840 modified "2023-09-25" @default.
- W2017403840 title "Structural Basis for the Catalytic Mechanism of a Proficient Enzyme: Orotidine 5‘-Monophosphate Decarboxylase<sup>,</sup>" @default.
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- W2017403840 doi "https://doi.org/10.1021/bi992952r" @default.
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