IUBMB Enzyme Nomenclature


Accepted name: α-neoagaro-oligosaccharide hydrolase

Reaction: Hydrolysis of the 1,3-α-L-galactosidic linkages of neoagaro-oligosaccharides that are smaller than a hexamer, yielding 3,6-anhydro-L-galactose and D-galactose

Glossary: In the field of oligosaccharides derived from agarose, carrageenans, etc., in which alternate residues are 3,6-anhydro sugars, the prefix 'neo' designates an oligosaccharide whose non-reducing end is the anhydro sugar, and the absence of this prefix means that it is not.
For example:
neoagarobiose = 3,6-anhydro-α-L-galactopyranosyl-(1→3)-D-galactose
agarobiose = β-D-galactopyranosyl-(1→4)-3,6-anhydro-L-galactose

Other name(s): α-neoagarooligosaccharide hydrolase; α-NAOS hydrolase

Systematic name: α-neoagaro-oligosaccharide 3-glycohydrolase

Comments: When neoagarohexaose is used as a substrate, the oligosaccharide is cleaved at the non-reducing end to produce 3,6-anhydro-L-galactose and agaropentaose, which is further hydrolysed to agarobiose and agarotriose. With neoagarotetraose as substrate, the products are predominantly agarotriose and 3,6-anhydro-L-galactose. In Vibrio sp. the actions of EC, β-agarase and EC can be used to degrade agarose to 3,6-anhydro-L-galactose and D-galactose.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 60063-77-6


1. Sugano, Y., Kodama, H., Terada, I., Yamazaki, Y. and Noma, M. Purification and characterization of a novel enzyme, α-neoagarooligosaccharide hydrolase (α-NAOS hydrolase), from a marine bacterium, Vibrio sp. strain JT0107. J. Bacteriol. 176 (1994) 6812-6818. [PMID: 7961439]

[EC created 2006]

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