Glycoside hydrolase family 68

In molecular biology, glycoside hydrolase family 68 is a family of glycoside hydrolases.

Levansucrase/Invertase
crystal structure of levansucrase (e342a) complexed with sucrose
Identifiers
SymbolGlyco_hydro_68
PfamPF02435
Pfam clanCL0143
InterProIPR003469
SCOP21oyg / SCOPe / SUPFAM
CAZyGH68

Glycoside hydrolases EC 3.2.1. 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]

The glycosyl hydrolase 68 family (CAZY GH_68) includes several bacterial levansucrase enzymes, and invertase from Zymomonas. Levansucrase (EC 2.4.1.10), also known as beta-D-fructofuranosyl transferase, catalyses the conversion of sucrose and (2,6-beta-D-fructosyl)(N) to glucose and (2,6-beta-D-fructosyl)(N+1), where other sugars can also act as fructosyl acceptors. Invertase, or extracellular sucrase (EC 3.2.1.26), catalyses the hydrolysis of terminal non-reducing beta-D-fructofuranoside residues in beta-D-fructofuranosides.

References
  1. Henrissat B, Callebaut I, Fabrega S, Lehn P, Mornon JP, Davies G (July 1995). "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. Bibcode:1995PNAS...92.7090H. doi:10.1073/pnas.92.15.7090. PMC 41477. PMID 7624375.
  2. Davies G, Henrissat B (September 1995). "Structures and mechanisms of glycosyl hydrolases". Structure. 3 (9): 853–9. doi:10.1016/S0969-2126(01)00220-9. PMID 8535779.
  3. Henrissat B, Bairoch A (June 1996). "Updating the sequence-based classification of glycosyl hydrolases". The Biochemical Journal. 316 ( Pt 2) (Pt 2): 695–6. doi:10.1042/bj3160695. PMC 1217404. PMID 8687420.
  4. "Home". CAZy.org. Retrieved 2018-03-06.
  5. Lombard V, Golaconda Ramulu H, Drula E, Coutinho PM, Henrissat B (January 2014). "The carbohydrate-active enzymes database (CAZy) in 2013". Nucleic Acids Research. 42 (Database issue): D490–5. doi:10.1093/nar/gkt1178. PMC 3965031. PMID 24270786.
  6. "Glycoside Hydrolase Family 68". CAZypedia.org. Retrieved 2018-03-06.
  7. CAZypedia Consortium (December 2018). "Ten years of CAZypedia: a living encyclopedia of carbohydrate-active enzymes" (PDF). Glycobiology. 28 (1): 3–8. doi:10.1093/glycob/cwx089. hdl:21.11116/0000-0003-B7EB-6. PMID 29040563.
This article incorporates text from the public domain Pfam and InterPro: IPR003469
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