1F34

CRYSTAL STRUCTURE OF ASCARIS PEPSIN INHIBITOR-3 BOUND TO PORCINE PEPSIN

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
Protein Modification Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1f34a_	All beta proteins	Acid proteases	Acid proteases	Pepsin-like	Pepsin(ogen)	(Sus scrofa ) [TaxId: 9823 ],	SCOPe (2.08)
B	d1f34b_	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	SCOP2B Superfamily	Acid proteases	8042474	3001059	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Pepsin inhibitor-3	8035718	3001417	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)
A	PF00026	e1f34A2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: PF00026	ECOD (1.6)
B	PF06394	e1f34B1	A: a+b duplicates or obligate multimers	X: Pepsin inhibitor-3 (From Topology)	H: Pepsin inhibitor-3 (From Topology)	T: Pepsin inhibitor-3	F: PF06394	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.70.10	Mainly Beta	Beta Barrel	Cathepsin D, subunit A	domain 1	CATH (4.3.0)
B	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	PF00026	Eukaryotic aspartyl protease (Asp)	Eukaryotic aspartyl protease	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	PEPSIN A	aspartic-type peptidase activity peptidase activity catalytic activity, acting on a protein hydrolase activity aspartic-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	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	-	extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR012848	Aspartic peptidase, N-terminal	Domain
A	IPR034162	Pepsin catalytic domain	Domain
A	IPR033121	Peptidase family A1 domain	Domain
A	IPR001461	Aspartic peptidase A1 family	Family
A	IPR021109	Aspartic peptidase domain superfamily	Homologous Superfamily
A	IPR001969	Aspartic peptidase, active site	Active Site
B	IPR010480	Pepsin inhibitor-3-like repeated domain	Domain
B	IPR038412	Pepsin inhibitor-3 domain superfamily	Homologous Superfamily

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A	SEP	Parent Component: SER RESID: AA0037 PSI-MOD : O-phospho-L-serine MOD:00046

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.