IUBMB Enzyme Nomenclature


Accepted name: α-3'-ketoglucosidase

Reaction: 3'-dehydrosucrose + H2O = 3-dehydro-D-glucopyranose + β-D-fructofuranose

Other name(s): 3'-keto-α-D-gluco-disaccharide hydrolase; α-3-ketoglucosidase (incorrect); 3-keto-glucoside hydrolase

Systematic name: 3'-dehydrosucrose 3'-dehydroglucohydrolase

Comments: The enzyme, originally characterized from the bacterium Agrobacterium tumefaciens, is specific for disaccharides that contain a 3-dehydro-α-D-glucose at the non-reducing end such as 3'-dehydrosucrose and 3'-dehydro-α,α-trehalose. It has no activity with disaccharides in which the glucose is in β conformation, and greatly reduced activity with disaccharides with an unmodified 3' position.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Hayano, K. and Fukui, S. Alpha-3-ketoglucosidase of Agrobacterium tumefaciens. J. Bacteriol. 101 (1970) 692-697. [PMID: 5438043]

2. Liu, H., Shiver, A.L., Price, M.N., Carlson, H.K., Trotter, V.V., Chen, Y., Escalante, V., Ray, J., Hern, K.E., Petzold, C.J., Turnbaugh, P.J., Huang, K.C., Arkin, A.P. and Deutschbauer, A.M. Functional genetics of human gut commensal Bacteroides thetaiotaomicron reveals metabolic requirements for growth across environments. Cell Rep. 34 (2021) 108789. [PMID: 33657378]

[EC created 2022]

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