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Evidence that oxidative dephosphorylation by the nonheme Fe(II), ?-ketoglutarate:UMP oxygenase occurs by stereospecific hydroxylation.


ABSTRACT: LipL and Cpr19 are nonheme, mononuclear Fe(II)-dependent, ?-ketoglutarate (?KG):UMP oxygenases that catalyze the formation of CO2 , succinate, phosphate, and uridine-5'-aldehyde, the last of which is a biosynthetic precursor for several nucleoside antibiotics that inhibit bacterial translocase I (MraY). To better understand the chemistry underlying this unusual oxidative dephosphorylation and establish a mechanistic framework for LipL and Cpr19, we report herein the synthesis of two biochemical probes-[1',3',4',5',5'-2 H]UMP and the phosphonate derivative of UMP-and their activity with both enzymes. The results are consistent with a reaction coordinate that proceeds through the loss of one 2 H atom of [1',3',4',5',5'-2 H]UMP and stereospecific hydroxylation geminal to the phosphoester to form a cryptic intermediate, (5'R)-5'-hydroxy-UMP. Thus, these enzyme catalysts can additionally be assigned as UMP hydroxylase-phospholyases.

SUBMITTER: Goswami A 

PROVIDER: S-EPMC5380139 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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Evidence that oxidative dephosphorylation by the nonheme Fe(II), α-ketoglutarate:UMP oxygenase occurs by stereospecific hydroxylation.

Goswami Anwesha A   Liu Xiaodong X   Cai Wenlong W   Wyche Thomas P TP   Bugni Tim S TS   Meurillon Maïa M   Peyrottes Suzanne S   Perigaud Christian C   Nonaka Koichi K   Rohr Jürgen J   Van Lanen Steven G SG  

FEBS letters 20170125 3


LipL and Cpr19 are nonheme, mononuclear Fe(II)-dependent, α-ketoglutarate (αKG):UMP oxygenases that catalyze the formation of CO<sub>2</sub> , succinate, phosphate, and uridine-5'-aldehyde, the last of which is a biosynthetic precursor for several nucleoside antibiotics that inhibit bacterial translocase I (MraY). To better understand the chemistry underlying this unusual oxidative dephosphorylation and establish a mechanistic framework for LipL and Cpr19, we report herein the synthesis of two b  ...[more]

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