Glycoside Hydrolase Family 50

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• Author:
• 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 and -tetraose [1],[2]. Three enzymes, Aga50A and Aga50D from Saccharophagus degradans and Aga50B from Vibrio sp. have been reported to be pure exo-β-agarases [3].

Kinetics and Mechanism

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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

1. Sugano Y, Terada I, Arita M, Noma M, and Matsumoto T. (1993). Purification and characterization of a new agarase from a marine bacterium, Vibrio sp. strain JT0107. Appl Environ Microbiol. 1993;59(5):1549-54. DOI:10.1128/aem.59.5.1549-1554.1993 |
2. Sugano Y, Matsumoto T, and Noma M. (1994). Sequence analysis of the agaB gene encoding a new beta-agarase from Vibrio sp. strain JT0107. Biochim Biophys Acta. 1994;1218(1):105-8. DOI:10.1016/0167-4781(94)90109-0 |
3. Kim HT, Lee S, Lee D, Kim HS, Bang WG, Kim KH, and Choi IG. (2010). Overexpression and molecular characterization of Aga50D from Saccharophagus degradans 2-40: an exo-type beta-agarase producing neoagarobiose. Appl Microbiol Biotechnol. 2010;86(1):227-34. DOI:10.1007/s00253-009-2256-5 |