ExplorEnz: EC 2.5.1.50

Your query returned 1 entry. Printable version

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]