3RU4

Crystal structure of the Bowman-Birk serine protease inhibitor BTCI in complex with trypsin and chymotrypsin

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

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A [auth T]	d3ru4t_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
B	d3ru4b_	Small proteins	Knottins (small inhibitors, toxins, lectins)	Bowman-Birk inhibitor, BBI	Bowman-Birk inhibitor, BBI	automated matches	(Vigna unguiculata ) [TaxId: 3917 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth T]	SCOP2B Superfamily	Trypsin-like serine proteases	8037496	3000114	SCOP2B (2022-06-29)
B	SCOP2 Family	Bowman-Birk inhibitor BBI	8070232	4003232	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Bowman-Birk inhibitor BBI	8070233	3000463	SCOP2 (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 [auth T]	Trypsin_1	e3ru4T1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: Trypsin_1	ECOD (1.6)
B	Bowman-Birk_leg	e3ru4B1	A: few secondary structure elements	X: Bowman-Birk inhibitor, BBI-like (From Topology)	H: Bowman-Birk inhibitor, BBI-like (From Topology)	T: Bowman-Birk inhibitor, BBI-like	F: Bowman-Birk_leg	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth T]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
B	2.10.69.10	Mainly Beta	Ribbon	Cysteine Protease (Bromelain) Inhibitor, subunit H	Cysteine Protease (Bromelain) Inhibitor, subunit H	CATH (4.3.0)
D	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
E	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth T]	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain
D	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain
E	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth T]	Cationic trypsin	peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity endopeptidase activity serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity protein binding binding serpin family protein binding cation binding ion binding metal ion binding peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity endopeptidase activity serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity protein binding binding serpin family protein binding cation binding ion binding metal ion binding small molecule binding	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	protein-containing complex serine protease inhibitor complex protease inhibitor complex peptidase inhibitor complex extracellular region extracellular space cellular anatomical entity
B	Bowman-Birk type seed trypsin and chymotrypsin inhibitor	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity	-	extracellular region cellular anatomical entity
C	Chymotrypsinogen A	peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase activity protein binding binding serpin family protein binding	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	protein-containing complex serine protease inhibitor complex protease inhibitor complex peptidase inhibitor complex extracellular region cellular anatomical entity
D	Chymotrypsinogen A	peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase activity protein binding binding serpin family protein binding	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	protein-containing complex serine protease inhibitor complex protease inhibitor complex peptidase inhibitor complex extracellular region cellular anatomical entity
E	Chymotrypsinogen A	peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase activity protein binding binding serpin family protein binding	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	protein-containing complex serine protease inhibitor complex protease inhibitor complex peptidase inhibitor complex extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth T]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A [auth T]	IPR001314	Peptidase S1A, chymotrypsin family	Family
A [auth T]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
A [auth T]	IPR001254	Serine proteases, trypsin domain	Domain
A [auth T]	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
A [auth T]	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
B	IPR000877	Proteinase inhibitor I12, Bowman-Birk	Domain
B	IPR035995	Bowman-Birk type proteinase inhibitor	Homologous Superfamily
C	IPR001254	Serine proteases, trypsin domain	Domain
C	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
C	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
C	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
C	IPR001314	Peptidase S1A, chymotrypsin family	Family
C	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
D	IPR001254	Serine proteases, trypsin domain	Domain
D	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
D	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
D	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
D	IPR001314	Peptidase S1A, chymotrypsin family	Family
D	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
E	IPR001254	Serine proteases, trypsin domain	Domain
E	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
E	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
E	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
E	IPR001314	Peptidase S1A, chymotrypsin family	Family
E	IPR033116	Serine proteases, trypsin family, serine active site	Active Site