Annotations: 1F32

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1f32a_	Alpha and beta proteins (a+b)	Pepsin inhibitor-3	Pepsin inhibitor-3	Pepsin inhibitor-3	Pepsin inhibitor-3	pig roundworm (Ascaris suum ) [TaxId: 6253 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Pepsin inhibitor-3	8023338	4001377	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Pepsin inhibitor-3	8035718	3001417	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	Pepsin-I3	e1f32A1	A: a+b duplicates or obligate multimers	X: Pepsin inhibitor-3 (From Topology)	H: Pepsin inhibitor-3 (From Topology)	T: Pepsin inhibitor-3	F: Pepsin-I3	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.1120.50	Alpha Beta	2-Layer Sandwich	Arylsulfatase, C-terminal domain	Pepsin inhibitor-3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF06394	Pepsin inhibitor-3-like repeated domain (Pepsin-I3)	Pepsin inhibitor-3-like repeated domain	Pepsin inhibitor-3 consisting of two domains, each comprising an antiparallel beta-sheet flanked by an alpha-helix. In the enzyme-inhibitor complex, the N-terminal beta-strand of PI-3 pairs with one strand of the active site flap region of pepsin ...	Pepsin inhibitor-3 consisting of two domains, each comprising an antiparallel beta-sheet flanked by an alpha-helix. In the enzyme-inhibitor complex, the N-terminal beta-strand of PI-3 pairs with one strand of the active site flap region of pepsin [1]. The two domains are tandem repeats of sequence, and has therefore been termed repeated domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	MAJOR PEPSIN INHIBITOR PI-3	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity aspartic-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity	-	cellular anatomical structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR010480	Pepsin inhibitor-3-like repeated domain	Domain
A	IPR051901	Protease Inhibitor I33	Family
A	IPR038412	Pepsin inhibitor-3 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 R01GM157729.