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• W2223264101 abstract "Oxalate decarboxylase (OxDC) catalyzes the disproportionation of oxalic acid monoanion into CO2 and formate. The enzyme has long been hypothesized to utilize dioxygen to form mononuclear Mn(III) or Mn(IV) in the catalytic site during turnover. Recombinant OxDC, however, contains only tightly bound Mn(II), and direct spectroscopic detection of the metal in higher oxidation states under optimal catalytic conditions (pH 4.2) has not yet been reported. Using parallel mode electron paramagnetic resonance spectroscopy, we now show that substantial amounts of Mn(III) are indeed formed in OxDC, but only in the presence of oxalate and dioxygen under acidic conditions. These observations provide the first direct support for proposals in which Mn(III) removes an electron from the substrate to yield a radical intermediate in which the barrier to C–C bond cleavage is significantly decreased. Thus, OxDC joins a small list of enzymes capable of stabilizing and controlling the reactivity of the powerful oxidizing species Mn(III)." @default.
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• W2223264101 date "2016-01-11" @default.
• W2223264101 modified "2023-10-16" @default.
• W2223264101 title "Formation of Hexacoordinate Mn(III) in <i>Bacillus subtilis</i> Oxalate Decarboxylase Requires Catalytic Turnover" @default.
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• W2223264101 doi "https://doi.org/10.1021/acs.biochem.5b01340" @default.
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