Activities in Family	Modules of approx. 70 residues. The chitin-binding function has been demonstrated in several cases. These modules are found attached to a number of chitinase catalytic domains, but also in non-catalytic proteins either in isolation or as multiple repeats; chitin binding (EC IIa.chitin)
External resources	CAZypedia;
Statistics	GenBank accession (4129); Uniprot accession (50); PDB accession (10); 3D entries (8); cryst (0)

Eukaryota
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
allergen (Blo t 12; Blo t 12.0101;Blo t 12.0102)		Blomia tropicalis	AAA78904.1		2MFK[A] NMR
ORF		Dermatophagoides farinae	ATI08935.1		5ZJL[A,B] 1.70
dust mite allergen (Der p 23) (possible fragment)		Dermatophagoides pteronyssinus	ACB46292.1		4ZCE[A,B] 1.55
chitin binding beak protein 3 (Cbp-3)		Dosidicus gigas	AKI30064.1		7BWE[A] NMR 7BWO[A] NMR
avirulence protein (Avr4;Cf-Avr4)		Fulvia fulva RACE 5	CAA69643.1		6BN0[A,B,C,D] β-D-GlcpNAc-(1-4)-β-D-GlcpNAc-(1-4)-β-D-GlcpNAc-(1-4)-β-D-GlcpNAc-(1-4)-β-D-GlcpNAc-(1-4)-β-D-GlcpNAc 1.95
chitinase / chitotriosidase (Chit1; CHIT1; CHIT-1; HCHT; HsCht)		Homo sapiens	CAC37767.1 AAC50246.1 AAE83140.1 AAH69614.1 AAI03696.1 AAI05681.1 AAI05682.1 AAI05683.1 AAY73903.1 ABE14345.1 BAG51478.1 CAC37768.1 NP_001243054.2 NP_003456.1	Q13231	5HBF[A,B] 1.95 6SO0[A] NMR
avirulence protein 4 (Avr4;Pf-Avr4)		Pseudocercospora fuligena	AKG25561.1		4Z4A[A] 1.70
tachycitin		Tachypleus tridentatus	BAA12864.1		1DQC[A] NMR
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