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Established mechanism for aconitate isomerase from P. putida and a proposed mechanism for PrpF. (A) Shows the mechanism for aconitate isomerase that was established from isotope labeling and tritium exchange measurements (Klinman and Rose 1971a). (B) Shows the proposed mechanism for PrpF. In the latter case, the isomerization is proposed to occur through a single proton abstraction coupled to rotation about the C2–C3 bond.
