2RA3

Human cationic trypsin complexed with bovine pancreatic trypsin inhibitor (BPTI)

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
Pharos: Disease Associations

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth I]	d2ra3i_	Small proteins	BPTI-like	BPTI-like	Small Kunitz-type inhibitors & BPTI-like toxins	Pancreatic trypsin inhibitor, BPTI	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
D [auth C]	d2ra3c_	Small proteins	BPTI-like	BPTI-like	Small Kunitz-type inhibitors & BPTI-like toxins	Pancreatic trypsin inhibitor, BPTI	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
A	d2ra3a_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d2ra3b_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth I]	SCOP2B Superfamily	BPTI-like	8038485	3000628	SCOP2B (2022-06-29)
D [auth C]	SCOP2B Superfamily	BPTI-like	8038485	3000628	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Trypsin-like serine proteases	8042115	3000114	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Trypsin-like serine proteases	8042115	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 I]	Kunitz_BPTI	e2ra3I1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: Kunitz_BPTI	ECOD (1.6)
D [auth C]	Kunitz_BPTI	e2ra3C1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: Kunitz_BPTI	ECOD (1.6)
A	Trypsin_1	e2ra3A1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: Trypsin_1	ECOD (1.6)
B	Trypsin_1	e2ra3B1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: Trypsin_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth I]	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)
D [auth C]	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)
A	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
B	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
C [auth I], D [auth C]	PF00014	Kunitz/Bovine pancreatic trypsin inhibitor domain (Kunitz_BPTI)	Kunitz/Bovine pancreatic trypsin inhibitor domain	Indicative of a protease inhibitor, usually a serine protease inhibitor. Structure is a disulfide rich alpha+beta fold. BPTI (bovine pancreatic trypsin inhibitor) is an extensively studied model structure. Certain family members are similar to the ...	Indicative of a protease inhibitor, usually a serine protease inhibitor. Structure is a disulfide rich alpha+beta fold. BPTI (bovine pancreatic trypsin inhibitor) is an extensively studied model structure. Certain family members are similar to the tick anticoagulant peptide (TAP, Swiss:P17726). This is a highly selective inhibitor of factor Xa in the blood coagulation pathways [1]. TAP molecules are highly dipolar [2], and are arranged to form a twisted two- stranded antiparallel beta-sheet followed by an alpha helix [1].	Domain
A, B	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth I], D [auth C]	Pancreatic trypsin inhibitor	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding 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 cation binding ion binding binding calcium ion binding metal ion binding small molecule binding 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 protein binding enzyme binding zymogen binding protease binding sulfate binding anion binding sulfur compound binding potassium channel regulator activity channel regulator activity transporter inhibitor activity ion channel inhibitor activity ion channel regulator activity potassium channel inhibitor activity transporter regulator activity channel inhibitor activity	negative regulation of hydrolase activity negative regulation of proteolysis regulation of serine-type endopeptidase activity regulation of catalytic activity negative regulation of biological process negative regulation of catalytic activity negative regulation of nitrogen compound metabolic process negative regulation of endopeptidase activity regulation of primary metabolic process regulation of nitrogen compound metabolic process negative regulation of peptidase activity organic substance metabolic process regulation of proteolysis regulation of serine-type peptidase activity proteolysis negative regulation of hydrolase activity negative regulation of proteolysis regulation of serine-type endopeptidase activity regulation of catalytic activity negative regulation of biological process negative regulation of catalytic activity negative regulation of nitrogen compound metabolic process negative regulation of endopeptidase activity regulation of primary metabolic process regulation of nitrogen compound metabolic process negative regulation of peptidase activity organic substance metabolic process regulation of proteolysis regulation of serine-type peptidase activity proteolysis regulation of endopeptidase activity nitrogen compound metabolic process protein metabolic process negative regulation of protein metabolic process negative regulation of macromolecule metabolic process negative regulation of serine-type endopeptidase activity regulation of biological process organonitrogen compound metabolic process negative regulation of serine-type peptidase activity regulation of protein metabolic process negative regulation of metabolic process regulation of peptidase activity biological regulation negative regulation of molecular function primary metabolic process regulation of macromolecule metabolic process regulation of molecular function regulation of hydrolase activity metabolic process macromolecule metabolic process regulation of metabolic process multicellular organismal process regulation of body fluid levels regulation of cellular process response to stimulus regulation of cell activation negative regulation of cell adhesion negative regulation of platelet activation regulation of coagulation regulation of biological quality response to wounding negative regulation of homotypic cell-cell adhesion negative regulation of wound healing negative regulation of blood coagulation response to external stimulus blood coagulation negative regulation of hemostasis regulation of platelet activation regulation of response to stimulus negative regulation of response to external stimulus negative regulation of cell-cell adhesion regulation of wound healing negative regulation of multicellular organismal process platelet activation regulation of response to external stimulus homotypic cell-cell adhesion regulation of response to wounding cell adhesion cell-cell adhesion response to stress regulation of response to stress negative regulation of cellular process coagulation regulation of cell-cell adhesion regulation of multicellular organismal process regulation of hemostasis wound healing negative regulation of response to stimulus regulation of homotypic cell-cell adhesion regulation of cell adhesion regulation of blood coagulation hemostasis cell activation negative regulation of platelet aggregation negative regulation of response to wounding platelet aggregation negative regulation of cell activation regulation of platelet aggregation negative regulation of coagulation cellular process cellular response to stimulus negative regulation of thrombin-activated receptor signaling pathway signaling negative regulation of signaling regulation of signal transduction negative regulation of G protein-coupled receptor signaling pathway negative regulation of cell communication cell communication thrombin-activated receptor signaling pathway signal transduction regulation of G protein-coupled receptor signaling pathway regulation of signaling regulation of thrombin-activated receptor signaling pathway negative regulation of signal transduction regulation of cell communication G protein-coupled receptor signaling pathway zymogen activation cellular biosynthetic process cellular metabolic process gene expression macromolecule biosynthetic process protein maturation biosynthetic process organic substance biosynthetic process protein processing trypsinogen activation	protein-containing complex serine protease inhibitor complex protease inhibitor complex peptidase inhibitor complex extracellular region extracellular space cellular anatomical entity
A, B	Trypsin-1	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 cation binding ion binding binding metal ion binding small molecule binding	cellular component organization cellular component disassembly extracellular matrix disassembly extracellular matrix organization cellular process cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization organic substance metabolic process organonitrogen compound metabolic process proteolysis nitrogen compound metabolic process metabolic process primary metabolic process cellular component organization cellular component disassembly extracellular matrix disassembly extracellular matrix organization cellular process cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization organic substance metabolic process organonitrogen compound metabolic process proteolysis nitrogen compound metabolic process metabolic process primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	extracellular region extracellular space cellular anatomical entity blood microparticle cell periphery extracellular matrix external encapsulating structure collagen-containing extracellular matrix

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth I], D [auth C]	IPR020901	Proteinase inhibitor I2, Kunitz, conserved site	Conserved Site
C [auth I], D [auth C]	IPR036880	Pancreatic trypsin inhibitor Kunitz domain superfamily	Homologous Superfamily
C [auth I], D [auth C]	IPR002223	Pancreatic trypsin inhibitor Kunitz domain	Domain
A, B	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A, B	IPR001314	Peptidase S1A, chymotrypsin family	Family
A, B	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
A, B	IPR001254	Serine proteases, trypsin domain	Domain
A, B	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
A, B	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P07477	pancreatitis hereditary chronic pancreatitis trypsinogen deficiency chronic pancreatitis alcoholic pancreatitis colorectal cancer pancreatic intraductal papillary-mucinous carcinoma PANCREATITIS, CHRONIC, SUSCEPTIBILITY TO cystic fibrosis pancreatic intraductal papillary-mucinous neoplasm ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia

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.