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The synthesis of β-alanine.A, CoA synthesis in prokaryotes. B, hypothetical alternative route for β-alanine synthesis in ADP1. 1: l-aspartate kinase (LysC); 2: l-aspartate semialdehyde dehydrogenase (Asd); 3: l-2,4-diaminobutyrate aminotransferase (Dat); and 4: l-2,4-diaminobutyrate decarboxylase (Ddc). Reactions indicated in dotted lines are unknown. ADP1, Acinetobacter baylyi ADP1; DAB, 2,4-diaminobutyrate; DAP, 1,3-diaminopropane.
