1CNS

CRYSTAL STRUCTURE OF CHITINASE AT 1.91A RESOLUTION

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1cnsa_	Alpha and beta proteins (a+b)	Lysozyme-like	Lysozyme-like	Family 19 glycosidase	Plant class II chitinase	(Hordeum vulgare ) [TaxId: 4513 ],	SCOPe (2.08)
B	d1cnsb_	Alpha and beta proteins (a+b)	Lysozyme-like	Lysozyme-like	Family 19 glycosidase	Plant class II chitinase	(Hordeum vulgare ) [TaxId: 4513 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Lysozyme-like	8033622	3001879	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Lysozyme-like	8033622	3001879	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Glyco_hydro_19	e1cnsA1	A: a+b complex topology	X: Lysozyme-like (From Homology)	H: Lysozyme-like	T: Lysozyme-like	F: Glyco_hydro_19	ECOD (1.6)
B	Glyco_hydro_19	e1cnsB1	A: a+b complex topology	X: Lysozyme-like (From Homology)	H: Lysozyme-like	T: Lysozyme-like	F: Glyco_hydro_19	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.530.10	Mainly Alpha	Orthogonal Bundle	Lysozyme		CATH (4.3.0)
A	3.30.20.10	Alpha Beta	2-Layer Sandwich	Endochitinase	domain 2	CATH (4.3.0)
B	1.10.530.10	Mainly Alpha	Orthogonal Bundle	Lysozyme		CATH (4.3.0)
B	3.30.20.10	Alpha Beta	2-Layer Sandwich	Endochitinase	domain 2	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00182	Chitinase class I (Glyco_hydro_19)	Chitinase class I	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	CHITINASE	chitinase activity hydrolase activity, acting on glycosyl bonds hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity	organonitrogen compound catabolic process carbohydrate derivative catabolic process catabolic process organonitrogen compound metabolic process carbohydrate derivative metabolic process chitin metabolic process aminoglycan catabolic process macromolecule catabolic process glucosamine-containing compound catabolic process organic substance metabolic process amino sugar catabolic process aminoglycan metabolic process amino sugar metabolic process metabolic process organonitrogen compound catabolic process carbohydrate derivative catabolic process catabolic process organonitrogen compound metabolic process carbohydrate derivative metabolic process chitin metabolic process aminoglycan catabolic process macromolecule catabolic process glucosamine-containing compound catabolic process organic substance metabolic process amino sugar catabolic process aminoglycan metabolic process amino sugar metabolic process metabolic process macromolecule metabolic process organic substance catabolic process chitin catabolic process glucosamine-containing compound metabolic process carbohydrate metabolic process carbohydrate catabolic process primary metabolic process polysaccharide metabolic process polysaccharide catabolic process response to stimulus defense response response to stress cell wall organization or biogenesis cellular process cell wall macromolecule catabolic process cell wall macromolecule metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR016283	Glycoside hydrolase, family 19	Family
A, B	IPR000726	Glycoside hydrolase, family 19, catalytic	Domain
A, B	IPR023346	Lysozyme-like domain superfamily	Homologous Superfamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	chitinase (GH19, Class II) M-CSA #475	Chitinase binds to chitin and randomly cleaves glycosidic linkages in chitin and chitodextrins in a non-processive mode, generating chitooligosaccharides and free ends on which exo-chitinases and exo-chitodextrinases can act. Chitin is a bio-polymer composed of 1,4-beta linked N-acetylglucosamine units, a major component of fungal cell walls and insect exoskeletons. Activity is greatly stimulated in the presence of EC 1.14.99.53, lytic chitin monoxygenase, which attacks the crystalline structure of chitin and makes the polymer more accessible to the chitinase. It is used by the seeds to retard fungal growth by interfering with the cell wall. The enzyme, collected from barely seeds, is a type b member of the class II group, which is a member of Glycoside Hydrolase Family 19.	Defined by 2 residues: GLU:A-67GLU:A-89 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.2.1.14 (PDB Primary Data) Search M-CSA Motif + EC 3.2.1.14

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.