The Enzyme Database

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Accepted name: β-D-glucopyranosyl abscisate β-glucosidase
Reaction: D-glucopyranosyl abscisate + H2O = D-glucose + abscisate
For diagram of abscisic-acid biosynthesis, click here
Other name(s): AtBG1; ABA-β-D-glucosidase; ABA-specific β-glucosidase; ABA-GE hydrolase; β-D-glucopyranosyl abscisate hydrolase
Systematic name: β-D-glucopyranosyl abscisate glucohydrolase
Comments: The enzyme hydrolzes the biologically inactive β-D-glucopyranosyl ester of abscisic acid to produce active abscisate. Abscisate is a phytohormone critical for plant growth, development and adaption to various stress conditions. The enzyme does not hydrolyse β-D-glucopyranosyl zeatin [1].
Links to other databases: BRENDA, EXPASY, Gene, KEGG, MetaCyc
1.  Lee, K.H., Piao, H.L., Kim, H.Y., Choi, S.M., Jiang, F., Hartung, W., Hwang, I., Kwak, J.M., Lee, I.J. and Hwang, I. Activation of glucosidase via stress-induced polymerization rapidly increases active pools of abscisic acid. Cell 126 (2006) 1109–1120. [DOI] [PMID: 16990135]
2.  Kato-Noguchi, H. and Tanaka, Y. Effect of ABA-β-D-glucopyranosyl ester and activity of ABA-β-D-glucosidase in Arabidopsis thaliana. J. Plant Physiol. 165 (2008) 788–790. [DOI] [PMID: 17923167]
3.  Dietz, K.J., Sauter, A., Wichert, K., Messdaghi, D. and Hartung, W. Extracellular β-glucosidase activity in barley involved in the hydrolysis of ABA glucose conjugate in leaves. J. Exp. Bot. 51 (2000) 937–944. [DOI] [PMID: 10948220]
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