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HPLC trace of AmtA‐catalyzed transamidination reactions with alternative amidine acceptors. (A) With l‐Arg as donor and 6‐Aminocaproic acid as acceptor; (B) with l‐Arg as donor and Norleucine as acceptor; (C) with l‐Arg as donor and l‐Dap as acceptor; (D) with l‐Arg as donor and l‐Gly as acceptor. (i) Authorized standards; (ii) negative control reactions (enzyme AmtA was absent); (iii) transamidination reactions.
