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- ******************************************
- * Glycosyl hydrolases family 8 signature *
- ******************************************
-
- The microbial degradation of cellulose and xylans requires several types of
- enzymes such as endoglucanases (EC 3.2.1.4), cellobiohydrolases (EC 3.2.1.91)
- (exoglucanases), or xylanases (EC 3.2.1.8) [1,2]. Fungi and bacteria produces
- a spectrum of cellulolytic enzymes (cellulases) and xylanases which, on the
- basis of sequence similarities, can be classified into families. One of these
- families is known as the cellulase family D [3] or as the glycosyl hydrolases
- family 8 [4]. The enzymes which are currently known to belong to this family
- are listed below.
-
- - Bacillus strain KSM-330 acidic endonuclease K (Endo-K).
- - Cellulomonas uda endoglucanase.
- - Clostridium thermocellum endoglucanases A (celA).
- - Erwinia chrysanthemi minor endoglucanase y (celY).
- - Bacillus circulans beta-glucanase (EC 3.2.1.73).
-
- The most conserved region in these enzymes is a stretch of about 20 residues
- that contains two conserved aspartate and a tryptophan. Tryptophan has been
- shown [5], in Endo-K, to be important for the catalytic activity. We have used
- this region as a signature pattern.
-
- -Consensus pattern: A-[ST]-D-[AG]-D-x(2)-I-A-x-[SA]-[LIVM](2)-x-A-x(3)-W
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Beguin P.
- phycel@pasteur.bitnet
- Henrissat B.
- bernie@cermav.grenet.fr
-
- -Last update: October 1993 / First entry.
-
- [ 1] Beguin P.
- Annu. Rev. Microbiol. 44:219-248(1990).
- [ 2] Gilkes N.R., Henrissat B., Kilburn D.G., Miller R.C. Jr., Warren R.A.J.
- Microbiol. Rev. 55:303-315(1991).
- [ 3] Henrissat B., Claeyssens M., Tomme P., Lemesle L., Mornon J.P.
- Gene 81:83-95(1991).
- [ 4] Henrissat B.
- Biochem. J. 280:309-316(1991).
- [ 5] Ozaki K., Ito S.
- J. Gen. Microbiol. 137:41-48(1991).
-