The Enzyme Database

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EC 2.5.1.50     
Accepted name: zeatin 9-aminocarboxyethyltransferase
Reaction: O-acetyl-L-serine + zeatin = lupinate + acetate
For diagram of reaction, click here
Glossary: lupinate = (S)-2-amino-3-{[(E)-4-hydroxy-3-methylbut-2-enylamino]purin-9-yl}propanoate
zeatin = (E)-2-methyl-4-(9H-purin-6-ylamino)but-2-en-1-ol = (E)-N6-(4-hydroxy-3-methylbut-2-enyl)adenine
O-acetyl-L-serine = O3-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; 3-O-acetyl-L-serine:zeatin 2-amino-2-carboxyethyltransferase
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
References:
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 2.5.1.50 created 1984 as EC 4.2.99.13, transferred 2002 to EC 2.5.1.50]
 
 


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