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(A) General mechanism for reductive cleavage of SAM into 5′-deoxyadenosyl radical and methionine. (B) Structure of pyruvate formate lyase showing the wider, incomplete β/α barrel fold to accommodate this enzyme’s larger substrate—a peptide shown in magenta. (C) Lysine-2,3-aminomutase possesses a complete, closed β/α barrel that surrounds the small substrate, lysine, shown in magenta.
