Annotations: 3E8L

The Crystal Structure of the Double-headed Arrowhead Protease Inhibitor A in Complex with Two Trypsins

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)
C [auth B]	d3e8lb_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
B [auth A]	d3e8la_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
A [auth C]	d3e8lc_	All beta proteins	beta-Trefoil	STI-like	automated matches	automated matches	Arrowhead (Sagittaria sagittifolia ) [TaxId: 4451 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth B]	SCOP2B Superfamily	Trypsin-like serine proteases	8037496	3000114	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	Trypsin-like serine proteases	8037496	3000114	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)
C [auth B]	Ribosomal_L36	e3e8lB1	A: beta barrels	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Ribosomal_L36	ECOD (v294.2)
B [auth A]	Ribosomal_L36	e3e8lA1	A: beta barrels	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Ribosomal_L36	ECOD (v294.2)
A [auth C]	Glutaredoxin	e3e8lC1	A: beta barrels	X: Alpha-beta plaits	H: HMA-related	T: HMA, heavy metal-associated domain	F: Glutaredoxin	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth B]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
B [auth A]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
A [auth C]	2.80.10.50	Mainly Beta	Trefoil	Trefoil (Acidic Fibroblast Growth Factor, subunit A)		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B [auth A], C [auth B]	PF00089	Trypsin (Trypsin)	Trypsin		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth A], C [auth B]	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	proteolysis metabolic process cellular 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
A [auth C]	Serine proteinase inhibitor A	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth A], C [auth B]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
B [auth A], C [auth B]	IPR001314	Peptidase S1A, chymotrypsin family	Family
B [auth A], C [auth B]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
B [auth A], C [auth B]	IPR001254	Serine proteases, trypsin domain	Domain
B [auth A], C [auth B]	IPR050127	Serine Proteases (Peptidase S1 Family)	Family
B [auth A], C [auth B]	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
B [auth A], C [auth B]	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown
A [auth C]	IPR002160	Proteinase inhibitor I3, Kunitz legume	Family
A [auth C]	IPR011065	Kunitz inhibitor STI-like superfamily	Homologous Superfamily
A [auth C]	IPR016308	Proteinase inhibitor A/B	Family

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.