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- ******************************************
- * Glycosyl hydrolases family 5 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 A [3] or as the glycosyl hydrolases
- family 5 [4]. The enzymes which are currently known to belong to this family
- are listed below.
-
- - Endoglucanases from various species and strains of Bacillus.
- - Butyrivibrio fibrisolvens endoglucanases 1 (end1) and A (celA).
- - Caldocellum saccharolyticum bifunctional endoglucanase/exoglucanase (celB).
- This protein consists of two domains; it is the C-terminal domain, which
- has endoglucanase activity, which belongs to this family.
- - Clostridium acetobutylicum endoglucanase (eglA).
- - Clostridium cellulolyticum endoglucanases A (celccA) and D (celccD).
- - Clostridium cellulovorans endoglucanase B (engB) and D (engD).
- - Clostridium thermocellum endoglucanases B (celB), C (celC), E (celE), G
- (celG) and H (celH).
- - Erwinia chrysanthemi endoglucanase Z (celZ).
- - Fibrobacter succinogenes endoglucanase 3 (cel-3).
- - Pseudomonas fluorescens endoglucanase C (celC).
- - Pseudomonas solanacearum endoglucanase (egl).
- - Robillarda strain Y-20 endoglucanase I.
- - Ruminococcus albus endoglucanases I (EG-I), A (celA), and B (celB).
- - Ruminococcus flavefaciens cellodextrinase A (celA).
- - Streptomyces lividans endoglucanase.
- - Thermomonospora fusca endoglucanase E-5 (celE).
- - Trichoderma reesei endoglucanase II (EGLII).
- - Xanthomonas campestris endoglucanase (engxcA).
-
- As well as:
-
- - Baker's yeast glucan 1,3-beta-glucosidase I/II (EC 3.2.1.58) (EXG1).
- - Baker's yeast sporulation-specific glucan 1,3-beta-glucosidase (SPR1).
- - Caldocellum saccharolyticum beta-mannanase (EC 3.2.1.78) (manA).
-
- One of the conserved regions in these enzymes contains a conserved glutamic
- acid residue which is potentially involved [5] in the catalytic mechanism.
- We have used this region as a signature pattern.
-
- -Consensus pattern: [LIV]-[LIVMFYWGA](2)-[DNEG]-[LIVMGST]-x-N-E-[PV]-
- [RHDNSTLIVFY]
- [E is a putative active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for Robillarda Y-20 endoglucanase I and Ruminococcus flavefaciens celA whose
- sequences are known to be incorrect.
- -Other sequence(s) detected in SWISS-PROT: 6.
-
- -Expert(s) to contact by email: Beguin P.
- phycel@pasteur.bitnet
- Henrissat B.
- bernie@cermav.grenet.fr
-
- -Last update: June 1994 / Text revised.
-
- [ 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] Py B., Bortoli-German I., Haiech J., Chippaux M., Barras F.
- Protein Eng. 4:325-333(1991).
-