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Reaction of adenylation enzymes. A, reactions of α-amino acid adenylation enzymes PheA and SlgN1 and β-amino acid adenylation enzyme VinN. B, biosynthetic pathway of vicenistatin, including the VinN reaction. The 3-amino-2-methylpropionate unit is shown in red. ACP, acyl carrier protein; PKS, polyketide synthase; KS, ketosynthase; AT, acyltransferase; DH, dehydratase; KR, ketoreductase; TE, thioesterase.
