Glycoside Hydrolase Family 50

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• Author: ^^^Mirjam Czjzek^^^
• Responsible Curator: ^^^Mirjam Czjzek^^^

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Glycoside Hydrolase Family GH50
Clan	GH-A
Mechanism	probably retaining
Active site residues	inferred from clan GH-A as two Glu
CAZy DB link
http://www.cazy.org/GH50.html

Substrate specificities

To date, all characterized glycoside hydrolases of family 50 are β-agarases (EC 3.2.1.81) that cleave β-1,4 glycosidic bonds of agarose, releasing neoagaro-biose -tetraose and -hexaose [1, 2, 3, 4]. Three enzymes, Aga50A and Aga50D from Saccharophagus degradans and Aga50B from Vibrio sp. have been reported to be pure exo-β-agarases [5].

Kinetics and Mechanism

Actually, a potential retaining mechanism of this glycoside hydrolase family can only be inferred from analogy to clan GH-A enzymes http://www.cazy.org/GH50.html. No mechanistic or kintetic analysis demonstrating the stereochemical outcome of the reaction have been reported for this family to date.

Catalytic Residues

Unkown

Three-dimensional structures

Unknown; from analogy to clan GH-A enzymes it can be inferred that the 3D structure will be based on a (β/α)₈ barrel fold.

Family Firsts

Identification of first family member

The family was created in Cazy based on the work of Sugano et al. [1].

First stereochemistry determination

not determined yet.

First catalytic nucleophile identification

not determined yet.

First general acid/base residue identification

not determined yet.

First 3-D structure

not determined yet.

References

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