Mechanism	Retaining e
Clan	GH-A
3D Structure Status	( β / α ) 8 barrel
Catalytic Nucleophile/Base	Glu (experimental)
Catalytic Proton Donor	Glu (experimental)
Note	formerly known as cellulase family I.
External resources	CAZypedia;
Statistics	GenBank accession (6654); Uniprot accession (96); PDB accession (44); 3D entries (21); cryst (2)

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
H23	3.2.1.32	xylan endo-b-1,3-xylosidase	bDXylp	1,3	bDXylp	1,3	bDXylp	1,3	bDXylp	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
H59	3.2.1.78	mannan endo-b-1,4-mannosidase	bDManp	1,4	bDManp	1,4	bDManp	1,4	bDManp	H2O
H77	3.2.1.100	mannan exo-b-1,4-mannobiosidase	[bDManp	1,4	bDManp	1,4	bDManp	1,4	bDManp	H2O
H118	3.2.1.151	xyloglucan endo-b-1,4-glucosidase	(aDXylp-1,6)bDGlcp	1,4	bDGlcp	1,4	(aDXylp-1,6)bDGlcp	1,4	(aDXylp-1,6)bDGlcp	H2O
H355	3.2.1.-	MLX exo-b-1,4-xylosidase	bDXylp	1,3	bDXylp	1,4	bDXylp	1,4	bDXylp	H2O
H438	3.2.1.-	xylan exo-b-1,3-xylobiosidase	[bDXylp	1,3	bDXylp	1,3	bDXylp	1,3	bDXylp	H2O
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