3BYB

Crystal structure of Textilinin-1, a Kunitz-type serine protease inhibitor from the Australian Common Brown snake venom

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	d3bybc_	Small proteins	BPTI-like	BPTI-like	automated matches	automated matches	(Pseudonaja textilis textilis ) [TaxId: 169397 ],	SCOPe (2.08)
A	d3byba_	Small proteins	BPTI-like	BPTI-like	automated matches	automated matches	(Pseudonaja textilis textilis ) [TaxId: 169397 ],	SCOPe (2.08)
B	d3bybb_	Small proteins	BPTI-like	BPTI-like	automated matches	automated matches	(Pseudonaja textilis textilis ) [TaxId: 169397 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	BPTI-like	8070111	3000628	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	BPTI-like	8070111	3000628	SCOP2B (2022-06-29)
B	SCOP2 Family	Small Kunitz-type inhibitors & BPTI-like toxins	8070110	4003337	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	BPTI-like	8070111	3000628	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)
C	PF00014	e3bybC1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: PF00014	ECOD (1.6)
A	PF00014	e3bybA1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: PF00014	ECOD (1.6)
B	PF00014	e3bybB1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: PF00014	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)
A	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)
B	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, 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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	Textilinin	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 toxin activity	biological process involved in interspecies interaction between organisms perturbation of blood coagulation in another organism suppression of blood coagulation in another organism modulation of process of another organism	extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C	IPR002223	Pancreatic trypsin inhibitor Kunitz domain	Domain
A, B, C	IPR020901	Proteinase inhibitor I2, Kunitz, conserved site	Conserved Site
A, B, C	IPR036880	Pancreatic trypsin inhibitor Kunitz domain superfamily	Homologous Superfamily

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 R01GM133198.