3BG4

The crystal structure of guamerin in complex with chymotrypsin and the development of an elastase-specific inhibitor

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)
D	d3bg4d_	Small proteins	Knottins (small inhibitors, toxins, lectins)	Leech antihemostatic proteins	automated matches	automated matches	Leech (Hirudo nipponia ) [TaxId: 42736 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
D	SCOP2 Family	Huristasin-like	8083327	4003247	SCOP2 (2022-06-29)
D	SCOP2 Superfamily	Leech antihemostatic proteins	8083328	3000489	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)
B	PF00089	e3bg4B1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)
C	PF00089	e3bg4C1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)
D	PF02822	e3bg4D1	A: few secondary structure elements	X: Huristasin-like (From Topology)	H: Huristasin-like (From Topology)	T: Huristasin-like	F: PF02822	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
C	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
D	2.10.22.10	Mainly Beta	Ribbon	Antistasin	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain
C	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain
D	PF02822	Antistasin family (Antistasin)	Antistasin family	Members of this family are inhibitors of trypsin family proteases. This domain is highly disulphide bonded. The domain is also found in some large extracellular proteins in multiple copies.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Chymotrypsin A chain 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	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	extracellular region cellular anatomical entity
B	Chymotrypsin A chain B	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
C	Chymotrypsin A chain C	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	Guamerin	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	multicellular organismal process regulation of biological process negative regulation of coagulation biological regulation negative regulation of biological process coagulation regulation of multicellular organismal process negative regulation of multicellular organismal process regulation of coagulation	extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001254	Serine proteases, trypsin domain	Domain
A	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
A	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
A	IPR001314	Peptidase S1A, chymotrypsin family	Family
A	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
B	IPR001254	Serine proteases, trypsin domain	Domain
B	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
B	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
B	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
B	IPR001314	Peptidase S1A, chymotrypsin family	Family
B	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
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	IPR004094	Antistasin-like domain	Domain
D	IPR008086	Proteinase inhibitor I15, leech antistasin	Family
D	IPR011061	Hirudin/antistatin	Homologous Superfamily