Annotations: 4AOR

Cationic trypsin in complex with the Spinacia oleracea trypsin inhibitor III (SOTI-III)

External Resource: Annotation

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: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	Trypsin-like serine proteases	8037496	3000114	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Trypsin-like serine proteases	8037496	3000114	SCOP2B (2022-06-29)
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)
F	ABC_tran	e4aorF1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: ABC_tran	ECOD (v294.2)
E	ABC_tran	e4aorE1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: ABC_tran	ECOD (v294.2)
D	Tryp_inh	e4aorD1	A: beta barrels	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: Tryp_inh	ECOD (v294.2)
C	RRM_1	e4aorC1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (v294.2)
B	RRM_1	e4aorB1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (v294.2)
A	RRM_1	e4aorA1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	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)
A	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
D, E, F	PF17983	Trypsin inhibitors 1,2 and 3 (Tryp_inh)	Trypsin inhibitors 1,2 and 3	This is domain is found in trypsin inhibitor 1, 2 and 3 found in Chenopodiaceae. Structure analysis of S. oleracea trypsin inhibitor III (SOTI-III), in complex with bovine pancreatic trypsin, shows a knottin-like cystine-bridge topology [1].	Domain
A, B, C	PF00089	Trypsin (Trypsin)	Trypsin		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D, E, F	TRYPSIN INHIBITOR 3	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	-	-
A, B, C	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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D, E, F	IPR040875	Trypsin inhibitor	Domain
A, B, C	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A, B, C	IPR001314	Peptidase S1A, chymotrypsin family	Family
A, B, C	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
A, B, C	IPR001254	Serine proteases, trypsin domain	Domain
A, B, C	IPR050127	Serine Proteases (Peptidase S1 Family)	Family
A, B, C	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
A, B, C	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown

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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.