Biology:Glycoside hydrolase family 6
| Glycosyl hydrolases family 6 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | Glyco_hydro_6 | ||||||||
| Pfam | PF01341 | ||||||||
| InterPro | IPR001524 | ||||||||
| SCOP2 | 1cb2 / SCOPe / SUPFAM | ||||||||
| CAZy | GH6 | ||||||||
| |||||||||
In molecular biology, glycoside hydrolase family 6 is a family of glycoside hydrolases EC 3.2.1., which are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families.[1][2][3] This classification is available on the CAZy web site,[4][5] and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.[6][7]
Glycoside hydrolase family 6 CAZY GH_6 comprises enzymes with several known activities including endoglucanase (EC 3.2.1.4) and cellobiohydrolase (EC 3.2.1.91). These enzymes were formerly known as cellulase family B. The 3D structure of the enzymatic core of cellobiohydrolase II (CBHII) from the fungus Trichoderma reesei reveals an alpha-beta protein with a fold similar to the ubiquitous barrel topology first seen in triose phosphate isomerase.[8] The active site of CBHII is located at the C-terminal end of a parallel beta barrel, in an enclosed tunnel through which the cellulose threads. Two aspartic acid residues, located in the centre of the tunnel are the probable catalytic residues.[8]
References
- ↑ "Conserved catalytic machinery and the prediction of a common fold for several families of glycosyl hydrolases". Proceedings of the National Academy of Sciences of the United States of America 92 (15): 7090–4. July 1995. doi:10.1073/pnas.92.15.7090. PMID 7624375. Bibcode: 1995PNAS...92.7090H.
- ↑ "Structures and mechanisms of glycosyl hydrolases". Structure 3 (9): 853–9. September 1995. doi:10.1016/S0969-2126(01)00220-9. PMID 8535779.
- ↑ "Updating the sequence-based classification of glycosyl hydrolases". The Biochemical Journal 316 (Pt 2): 695–6. June 1996. doi:10.1042/bj3160695. PMID 8687420.
- ↑ "Home" (in en). http://www.cazy.org/.
- ↑ "The carbohydrate-active enzymes database (CAZy) in 2013". Nucleic Acids Research 42 (Database issue): D490–5. January 2014. doi:10.1093/nar/gkt1178. PMID 24270786.
- ↑ "Glycoside Hydrolase Family 6" (in en). http://www.cazypedia.org/index.php/Glycoside_Hydrolase_Family_6.
- ↑ CAZypedia Consortium (December 2018). "Ten years of CAZypedia: a living encyclopedia of carbohydrate-active enzymes". Glycobiology 28 (1): 3–8. doi:10.1093/glycob/cwx089. PMID 29040563.
- ↑ 8.0 8.1 "Three-dimensional structure of cellobiohydrolase II from Trichoderma reesei". Science 249 (4967): 380–6. July 1990. doi:10.1126/science.2377893. PMID 2377893. Bibcode: 1990Sci...249..380R.
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