Activities in Family	Modules of approx. 120 residues. The cellulose-binding function has been demonstrated in one case on amorphous cellulose and β-1,4-xylan. Some of these modules also bind β-1,3-glucan, β-1,3-1,4-glucan, and β-1,4-glucan.
3D Structure Status	β-sandwich
Note	Previously known as cellulose-binding domain family VI (CBD VI).
External resources	CAZypedia; PROSITE;
Commercial Enzyme Provider(s)	NZYTech; PROZOMIX;
Statistics	GenBank accession (7192); Uniprot accession (89); PDB accession (38); 3D entries (12); cryst (0)

Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
xylanase (M6;CtM6;CtXyl5A;Cthe_2193) (arabinoxylan-specific) (Xyl5A)		Acetivibrio thermocellus ATCC 27405	ABN53395.1	A3DHG6	2Y8K[A] 1.47 5AK1[A] 2.64 5G56[A] 2.64 5LA0[A] α-L-Arap 1.65 5LA1[A] β-D-Xylp 1.90 5LA2[A,B] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)[α-L-Araf-(1-3)]-α-D-Xylp β-L-Arap 1.65
xylanase A or U / acetylxylan esterase (XynA;XynU;CtCE4;LX4) (Xyn11A)		Acetivibrio thermocellus F1 / YS	AAC04579.1 BAA33543.1	O52780 O87119	1GMM[A] 2.0 1UXX[X] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 1.6
arabinoxylan α-L-1,3-arabinofuranohydrolase (XynD;BsAXH-m23;BSU18160)		Bacillus subtilis subsp. subtilis str. 168	CAB13699.1 AIY93126.1 AQR81807.1 AQR86021.1 CAA97613.1 NP_389698.1	A0A6M4JGV3 Q45071	3C7E[A] 2.00 3C7F[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 1.55 3C7G[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 2.02 3C7H[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 2.00 3C7O[A] β-D-Glcp-(1-4)-β-D-Galp-(1-4)-β-D-Glcp-(1-4)-β-D-Glcp 1.80
endo-β-1,4-glucanase B (CelB) (Cel5A;Cel5B)		Cellvibrio mixtus ATCC 12120	AAB61462.2	O07653	1UXZ[A,B] 1.4 1UY0[A,B] β-D-Glcp-(1-3)-β-D-Glcp-(1-4)-β-D-Glcp-(1-3)-β-D-Glcp β-D-Glcp-(1-4)-β-D-Glcp 1.65 1UYX[A,B] β-D-Glcp-(1-1)-<non_carb> β-D-Glcp-(1-4)-α-D-Glcp β-D-Glcp-(1-4)-β-D-Glcp 1.47 1UYY[A,B] β-D-Glcp-(1-4)-β-D-Glcp β-D-Glcp-(1-4)-β-D-Glcp-(1-4)-β-D-Glcp 1.47 1UYZ[A,B] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 1.6 1UZ0[A] β-D-Glcp-(1-4)-β-D-Glcp-(1-3)-β-D-Glcp-(1-4)-β-D-Glcp 2.0
β-1,3-glucanase / laminarinase (BhGH81;BH0236)		Halalkalibacterium halodurans C-125	BAB03955.1 NP_241102.1	Q9KG76	1W9S[A,B] 1.59 1W9T[A,B] β-D-Xylp-(1-4)-β-D-Xylp β-L-Arap 1.62 1W9W[A] β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-α-D-Glcp-(1-3)-β-D-Glcp-(1-3)-β-D-Glcp 2.1
Pedsa_2569		Pseudopedobacter saltans DSM 12145	ADY53113.1		8HCJ[A,B,C,D,E,F,G,H] 2.57
β-galactosidase (Gal59A;Ccel_1238) (Gal59A)		Ruminiclostridium cellulolyticum H10	ABG76970.1 ACL75594.1		2V4V[A] β-D-Xylp 1.50
endo-β-agarase I / B (AgaB;Sde_1175) (Aga16B)		Saccharophagus degradans 2-40	ABD80437.1 AAT67062.1	Q21LJ2 Q6DN99	2CDO[A,B,C,D] unknown-(1-3)-β-D-Gulp α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp-(1-4)-α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp-(1-4)-α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp 1.64 2CDP[A,B,C,D] unknown-(1-3)-β-D-Gulp α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp-(1-4)-α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp-(1-4)-α-L-3,6-anhydro-Galp-(1-3)-β-D-Galp 1.59
Sde_1445 (Cbm6E)		Saccharophagus degradans 2-40	ABD80707.1		8J3X[A,B] 2.40 8J3Y[A,B] β-D-Glcp β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-α-D-Glcp-(1-3)-β-D-Glcp β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-β-D-Glcp-(1-3)-β-D-Glcp 1.28
xylanase A (XynA) (Xyn11A)		Thermoclostridium stercorarium NCIMB 11754	CAD48307.1 AAL14106.1	Q8GJ44 Q93AQ5	1UY1[A] 1.8 1UY2[A] β-D-Xylp-(1-4)-β-D-Xylp 1.7 1UY3[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 1.89 1UY4[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 1.69
xylanase A (XynA) (Xyn11A)		Thermoclostridium stercorarium NCIMB 11754	CAD48307.1 AAL14106.1	Q8GJ44 Q93AQ5	1NAE[A] β-D-Xylp-(1-4)-β-D-Xylp-(1-4)-β-D-Xylp 2.05 1O8P[A] 2.0 1O8S[A] β-D-Glcp-(1-4)-β-D-Glcp 1.15 1OD3[A] β-D-Glcp-(1-3)-β-D-Glcp 1.0
laminarinase (LamC; ZgLamC; ZgLamCGH16; zobellia_1010)		Zobellia galactanivorans DsijT	CAZ95067.1	G0L2L9	4CRR[A] 1.40 5FUI[A] 1.40
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