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Two possible mechanisms for PhDph2-catalyzed reaction. a. One [4Fe-4S] cluster per PhDph2 dimer is sufficient for the reaction and the ACP radical adds to the imidazole ring; b. Two [4Fe-4S] clusters per PhDph2 dimer are required for the reaction. The ACP radical abstracts a hydrogen atom from the imidazole ring. As a consequence, one reaction needs two SAM with one ACP transferred to PhEF and the other one released as 2-aminobutyric acid.
