Glycoside Hydrolase Family 81

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• Author: ^^^Julie Grondin^^^
• Responsible Curator: ^^^Al Boraston^^^

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Glycoside Hydrolase Family GH81
Clan	none
Mechanism	inverting
Active site residues	not known
CAZy DB link
https://www.cazy.org/GH81.html

Substrate specificities

GH81 family are endo-β(1,3)-glucanases (EC 3.2.1.39) with diverse physiological roles, such as plant biomass degradation, cell cycling, and enzymatic pathogen defense. They are mostly found in bacteria and fungi, particularly abundant in Saccharomyces, and Streptomyces species. Activity has been demonstrated on laminarin [1, 2, 3, 4, 5, 6], curdlan [1, 3, 5, 6], and pachyman [2, 5].

Kinetics and Mechanism

GH81 enzymes follow an inverting mechanism, first shown by ¹H-NMR during the hydrolysis of laminarioligosaccharides [7], and laminarin [2], thus operating by a single-displacement mechanism.

Catalytic Residues

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Three-dimensional structures

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Family Firsts

First stereochemistry determination

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First catalytic nucleophile identification

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First general acid/base residue identification

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First 3-D structure

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References

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