1QK2

WILD TYPE CEL6A WITH A NON-HYDROLYSABLE CELLOTETRAOSE

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-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qk2a_	Alpha and beta proteins (a/b)	7-stranded beta/alpha barrel	Glycosyl hydrolases family 6, cellulases	Glycosyl hydrolases family 6, cellulases	Cellobiohydrolase II (Cel6)	(Trichoderma reesei ) [TaxId: 51453 ],	SCOPe (2.08)
B	d1qk2b_	Alpha and beta proteins (a/b)	7-stranded beta/alpha barrel	Glycosyl hydrolases family 6, cellulases	Glycosyl hydrolases family 6, cellulases	Cellobiohydrolase II (Cel6)	(Trichoderma reesei ) [TaxId: 51453 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Glycosyl hydrolases family 6, cellulases	8043861	3001060	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Glycosyl hydrolases family 6, cellulases	8043861	3001060	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_6	e1qk2A1	A: a/b barrels	X: TIM beta/alpha-barrel	H: Cellulases (From Topology)	T: Cellulases	F: Glyco_hydro_6	ECOD (1.6)
B	Glyco_hydro_6	e1qk2B1	A: a/b barrels	X: TIM beta/alpha-barrel	H: Cellulases (From Topology)	T: Cellulases	F: Glyco_hydro_6	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.20.20.40	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	1, 4-beta cellobiohydrolase	CATH (4.3.0)
B	3.20.20.40	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	1, 4-beta cellobiohydrolase	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01341	Glycosyl hydrolases family 6 (Glyco_hydro_6)	Glycosyl hydrolases family 6	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	CELLOBIOHYDROLASE CEL6A (FORMERLY CALLED CBH II)	hydrolase activity, acting on glycosyl bonds cellulose 1,4-beta-cellobiosidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity binding polysaccharide binding cellulose binding carbohydrate binding identical protein binding protein binding	carbohydrate metabolic process catabolic process glucan catabolic process beta-glucan metabolic process carbohydrate catabolic process primary metabolic process macromolecule catabolic process polysaccharide metabolic process glucan metabolic process beta-glucan catabolic process polysaccharide catabolic process metabolic process cellulose catabolic process macromolecule metabolic process carbohydrate metabolic process catabolic process glucan catabolic process beta-glucan metabolic process carbohydrate catabolic process primary metabolic process macromolecule catabolic process polysaccharide metabolic process glucan metabolic process beta-glucan catabolic process polysaccharide catabolic process metabolic process cellulose catabolic process macromolecule metabolic process cellulose metabolic process	extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR016288	1, 4-beta cellobiohydrolase	Family
A, B	IPR036434	1, 4-beta cellobiohydrolase superfamily	Homologous Superfamily
A, B	IPR000254	Cellulose-binding domain, fungal	Domain
A, B	IPR001524	Glycoside hydrolase, family 6, conserved site	Conserved Site
A, B	IPR035971	Cellulose-binding domain superfamily	Homologous Superfamily

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

Chains	Enzyme Name	Description	Catalytic Residues
B	cellulose 1,4-beta-cellobiosidase (non-reducing end) M-CSA #440	This enzyme belongs to Glycosidase family-6, more specifically the exoglucanase family, which requires polymer-chain ends for catalytic activity. It has an inverting mechanism (equatorial to axial conformation) and catalyses the hydrolysis of (1-->4)-beta-D-glucosidic linkages in cellulose and cellotetraose, releasing cellobiose from the non-reducing ends of the chains.	Defined by 6 residues: TYR:B-85 [auth B-169]ARG:B-90 [auth B-174]ASP:B-91 [auth B-175]SER:B-97 [auth B-181]ASP:B-137 [auth B-221]ASP:B-317 [auth B-401] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.2.1.91 (PDB Primary Data) Search M-CSA Motif + EC 3.2.1.91

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729.