| Beta-galactosidase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 crystal structure of thermus thermophilus a4 beta-galactosidase | |||||||||
| Identifiers | |||||||||
| Symbol | Glyco_hydro_42 | ||||||||
| Pfam | PF02449 | ||||||||
| Pfam clan | CL0058 | ||||||||
| InterPro | IPR013529 | ||||||||
| SCOP2 | 1kwg / SCOPe / SUPFAM | ||||||||
| CAZy | GH42 | ||||||||
| |||||||||
| Beta-galactosidase trimerisation domain | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
crystal structure of thermus thermophilus a4 beta-galactosidase | |||||||||
| Identifiers | |||||||||
| Symbol | Glyco_hydro_42M | ||||||||
| Pfam | PF08532 | ||||||||
| Pfam clan | CL0014 | ||||||||
| InterPro | IPR013738 | ||||||||
| SCOP2 | 1kwg / SCOPe / SUPFAM | ||||||||
| |||||||||
| Beta-galactosidase C-terminal domain | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
crystal structure of thermus thermophilus a4 beta-galactosidase | |||||||||
| Identifiers | |||||||||
| Symbol | Glyco_hydro_42C | ||||||||
| Pfam | PF08533 | ||||||||
| Pfam clan | CL0369 | ||||||||
| InterPro | IPR013739 | ||||||||
| SCOP2 | 1kwg / SCOPe / SUPFAM | ||||||||
| |||||||||
In molecular biology, glycoside hydrolase family 42 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. [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 42 family CAZY GH_42 comprises beta-galactosidase enzymes ( EC 3.2.1.23). These enzyme catalyse the hydrolysis of terminal, non-reducing terminal beta-D-galactoside residues. The middle domain of these three-domain enzymes is involved in trimerisation. [8]
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "Home". CAZy.org. Retrieved 2018-03-06.
- ^ 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.
- ^ "Glycoside Hydrolase Family 42". CAZypedia.org. Retrieved 2018-03-06.
- ^ 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.
- ^ Shimizu T, Kobayashi T, Ba-Thein W, Ohtani K, Hayashi H (1995). "Sequence analysis of flanking regions of the pfoA gene of Clostridium perfringens: beta-galactosidase gene (pbg) is located in the 3'-flanking region". Microbiology and Immunology. 39 (9): 677–86. doi: 10.1111/j.1348-0421.1995.tb03256.x. PMID 8577281. S2CID 2650178.
