IUBMB Enzyme Nomenclature


Accepted name: zeatin 9-aminocarboxyethyltransferase

Reaction: O-acetyl-L-serine + zeatin = lupinate + acetate

For diagram click here.

lupinic acid
O-acetyl-L-serine = (2S)-3-acetyloxy-2-aminopropanoic acid

Other name(s): β-(9-cytokinin)-alanine synthase; β-(9-cytokinin)alanine synthase; O-acetyl-L-serine acetate-lyase (adding N6-substituted adenine); lupinate synthetase; lupinic acid synthase; lupinic acid synthetase

Systematic name: O-acetyl-L-serine:zeatin 2-amino-2-carboxyethyltransferase

Comments: The enzyme acts not only on zeatin but also on other N6-substituted adenines. The reaction destroys their cytokinin activity and forms the corresponding 3-(adenin-9-yl)-L-alanine.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 88086-35-5


1. Entsch, B., Parker, C.W. and Letham, D.S. An enzyme from lupin seeds forming alanine derivatives of cytokinins. Phytochemistry 22 (1983) 375-381.

2. Mok, D.W.S. and Mok, M.C. Cytokinin metabolism and action. Ann. Rev. Plant Physiol. Plant Mol. Biol. 52 (2001) 89-118.

[EC created 1984 as EC, transferred 2002 to EC]

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