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Glycoside hydrolase family 65

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Protein domain
Glycosyl hydrolase family 65, N-terminal domain
maltose phosphorylase from lactobacillus brevis
Identifiers
SymbolGlyco_hydro_65N
PfamPF03636
Pfam clanCL0103
InterProIPR005196
SCOP21h54 / SCOPe / SUPFAM
CAZyGH65
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
Protein domain
Glycosyl hydrolase family 65 central catalytic domain
maltose phosphorylase from lactobacillus brevis
Identifiers
SymbolGlyco_hydro_65m
PfamPF03632
Pfam clanCL0059
InterProIPR005195
SCOP21h54 / SCOPe / SUPFAM
CAZyGH65
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
Protein domain
Glycosyl hydrolase family 65, C-terminal domain
maltose phosphorylase from lactobacillus brevis
Identifiers
SymbolGlyco_hydro_65C
PfamPF03633
InterProIPR005194
SCOP21h54 / SCOPe / SUPFAM
CAZyGH65
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

In molecular biology, glycoside hydrolase family 65 is a family of glycoside hydrolases.

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. This classification is available on the CAZy web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.

This family of glycosyl hydrolases (CAZY GH_65) includes vacuolar acid trehalase and maltose phosphorylases. Maltose phosphorylase (MP) is a dimeric enzyme that catalyzes the conversion of maltose and inorganic phosphate into beta-D-glucose-1-phosphate and glucose.

It consists of three structural domains. The C-terminal domain forms a two layered jelly roll motif. This domain is situated at the base of the catalytic domain, however its function remains unknown. The central domain is the catalytic domain, which binds a phosphate ion that is proximal the highly conserved Glu. The arrangement of the phosphate and the glutamate is thought to cause nucleophilic attack on the anomeric carbon atom. The catalytic domain also forms the majority of the dimerisation interface. The N-terminal domain is believed to be essential for catalytic activity although its precise function remains unknown.

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): 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 65". 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. PMID 29040563.
  8. ^ van Tilbeurgh H, Egloff MP, Uppenberg J, Haalck L (2001). "Crystal structure of maltose phosphorylase from Lactobacillus brevis: unexpected evolutionary relationship with glucoamylases". Structure. 9 (8): 689–697. doi:10.1016/S0969-2126(01)00626-8. PMID 11587643.
This article incorporates text from the public domain Pfam and InterPro: IPR005194 This article incorporates text from the public domain Pfam and InterPro: IPR005195 This article incorporates text from the public domain Pfam and InterPro: IPR005196
Hydrolase: sugar hydrolases (EC 3.2)
3.2.1: Glycoside hydrolases
Disaccharidase
Glucosidases
Other
3.2.2: Hydrolysing
N-Glycosyl compounds
Enzymes
Activity
Regulation
Classification
Kinetics
Types
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