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. Author manuscript; available in PMC: 2013 Apr 3.
Published in final edited form as: Biochemistry. 2012 Mar 19;51(13):2911–2920. doi: 10.1021/bi300001q

Scheme 1.

Scheme 1

Proposed mechanism for oxalate decarboxylase showing the putative involvement of dioxygen in proton-coupled electron transfer (PCET) (11). Although spin-trapping experiments support radical anion 2 as an intermediate,7 the metal oxidation state(s) and location of the dioxygen binding site during catalytic turnover remain to be experimentally defined.