IUBMB Enzyme Nomenclature


Accepted name: avenacosidase

Reaction: avenacoside B + H2O = 26-desgluco-avenacoside B + D-glucose

For diagram of reaction, click here

Glossary: avenacoside B = (22S,25S)-3β-{β-D-glucopyranosyl-(1→3)-β-D-glucopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyloxy}-26-(β-D-glucopyranosyloxy)-22,25-epoxyfurost-5-ene
26-desgluco-avenacoside B = (22S,25S)-3β-{β-D-glucopyranosyl-(1→3)-β-D-glucopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyloxy}-22,25-epoxyfurost-5-en-26-ol

Other name(s): As-P60

Systematic name: avenacoside B 26-β-D-glucohydrolase

Comments: Isolated from oat (Avena sativa) seedlings. The product acts as a defense system against fungal infection. Also acts on avenacoside A.

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


1. Gus-Mayer, S., Brunner, H., Schneider-Poetsch, H.A. and Rudiger, W. Avenacosidase from oat: purification, sequence analysis and biochemical characterization of a new member of the BGA family of β-glucosidases. Plant Mol. Biol. 26 (1994) 909-921. [PMID: 8000004]

2. Gus-Mayer, S., Brunner, H., Schneider-Poetsch, H.A., Lottspeich, F., Eckerskorn, C., Grimm, R. and Rudiger, W. The amino acid sequence previously attributed to a protein kinase or a TCP1-related molecular chaperone and co-purified with phytochrome is a β-glucosidase. FEBS Lett 347 (1994) 51-54. [PMID: 8013661]

[EC created 2013]

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