Author's Organization:Faculty of Pharmaceutical Sciences, Chiba University Faculty of Pharmaceutical Sciences, Chiba University Faculty of Pharmaceutical Sciences, Chiba University Faculty of Pharmaceutical Sciences, Chiba University
β-(6-Benzylaminopurin-9-yl) alanine (3), a metabolite of the cytokinin 6-benzylaminopurine (2), was confirmed to be derived from O-acetyl-L-serine (1) and 2 by an enzyme in higher plants. Some properties of the enzyme are described.