Annotations: 1K9O

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A [auth I]	d1k9oi_	Multi-domain proteins (alpha and beta)	Serpins	Serpins	Serpins	Alaserpin (serpin 1)	tobacco hornworm (Manduca sexta ) [TaxId: 7130 ],	SCOPe (2.08)
B [auth E]	d1k9oe_	All beta proteins	Trypsin-like serine proteases	Trypsin-like serine proteases	Eukaryotic proteases	Trypsin(ogen)	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth I]	SCOP2 Family	Serpins	8025583	4002658	SCOP2 (2022-06-29)
A [auth I]	SCOP2 Superfamily	Serpins	8037962	3001563	SCOP2 (2022-06-29)
B [auth E]	SCOP2B Superfamily	Trypsin-like serine proteases	8042143	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)
A [auth I]	PF00079	e1k9oI1	A: a+b complex topology	X: Serpins (From Topology)	H: Serpins (From Topology)	T: Serpins	F: PF00079	ECOD (1.6)
B [auth E]	PF00089	e1k9oE1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth I]	3.30.497.10	Alpha Beta	2-Layer Sandwich	Antithrombin	Chain I, domain 2	CATH (4.3.0)
A [auth I]	2.30.39.10	Mainly Beta	Roll	Alpha-1-antitrypsin	domain 1	CATH (4.3.0)
B [auth E]	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
A [auth I]	PF00079	Serpin (serine protease inhibitor) (Serpin)	Serpin (serine protease inhibitor)	Structure is a multi-domain fold containing a bundle of helices and a beta sandwich.	Domain
B [auth E]	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth I]	ALASERPIN	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	biological process involved in interspecies interaction between organisms response to stimulus response to other organism response to bacterium response to external stimulus response to external biotic stimulus response to biotic stimulus	extracellular region extracellular space cellular anatomical entity
B [auth E]	TRYPSIN II ANIONIC	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding 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	collagen catabolic process catabolic process metabolic process collagen metabolic process response to nutrient levels response to stimulus response to chemical response to nutrient organic substance metabolic process organonitrogen compound metabolic process proteolysis primary metabolic process protein metabolic process macromolecule metabolic process collagen catabolic process catabolic process metabolic process collagen metabolic process response to nutrient levels response to stimulus response to chemical response to nutrient organic substance metabolic process organonitrogen compound metabolic process proteolysis primary metabolic process protein metabolic process macromolecule metabolic process multicellular organismal process digestion	extracellular region cellular anatomical entity extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth I]	IPR042178	Serpin superfamily, domain 1	Homologous Superfamily
A [auth I]	IPR023795	Serpin, conserved site	Conserved Site
A [auth I]	IPR042185	Serpin superfamily, domain 2	Homologous Superfamily
A [auth I]	IPR036186	Serpin superfamily	Homologous Superfamily
A [auth I]	IPR000215	Serpin family	Family
A [auth I]	IPR023796	Serpin domain	Domain
B [auth E]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
B [auth E]	IPR001314	Peptidase S1A, chymotrypsin family	Family
B [auth E]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
B [auth E]	IPR001254	Serine proteases, trypsin domain	Domain
B [auth E]	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
B [auth E]	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site

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.