| Mechanism | Retaining e | 
|---|---|
| Clan | GH-A | 
| 3D Structure Status | ( β / α ) 8 barrel | 
| Catalytic Nucleophile/Base | Glu (experimental) | 
| Catalytic Proton Donor | Glu (experimental) | 
| Note | Once known as cellulase family A; many members have been assigned to subfamilies as described by Aspeborg et al. (2012) BMC Evol Biol. 12(1):186 (PMID: 22992189). | 
| External resources | CAZypedia; PROSITE; | 
| Statistics | GenBank accession (71); Uniprot accession (16); PDB accession (3); 3D entries (1); cryst (0) | 
| Activity Id | EC# | Activity Name | Residue -2 | Bond -1 | Residue -1 | Reacting Bond | Residue +1 | Bond +1 | Residue +2 | Reactant | 
| H4 | 3.2.1.4 | cellulose endo-b-1,4-glucosidase | bDGlcp | 1,4 | bDGlcp | 1,4 | bDGlcp | 1,4 | bDGlcp | H2O | 
| H5 | 3.2.1.6 | MLG endo-b-1,3/4-glucosidase | bDGlcp | 1,3/4 | bDGlcp | 1,3/4 | bDGlcp | 1,3/4 | bDGlcp | H2O | 
| H55 | 3.2.1.73 | MLG endo-b-1,4-glucosidase | bDGlcp | 1,3/4 | bDGlcp | 1,4 | bDGlcp | 1,3/4 | bDGlcp | H2O | 
| H56 | 3.2.1.74 | cellulose exo-b-1,4-glucosidase | [bDGlcp | 1,4 | bDGlcp | 1,4 | bDGlcp | H2O | ||
| H68 | 3.2.1.91 | cellulose exo-b-1,4-glucobiosidase | [bDGlcp | 1,4 | bDGlcp | 1,4 | bDGlcp | 1,4 | bDGlcp | H2O | 
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