6KBR

Crystal structure of Human KLK4 and SPINK2 derived KLK4 inhibitor complex

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
Pharos: Disease Associations

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth C]	d6kbrc_	Small proteins	Kazal-type serine protease inhibitors	Kazal-type serine protease inhibitors	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Trypsin-like serine proteases	8103731	3000114	SCOP2B (2022-06-29)
B [auth C]	SCOP2B Superfamily	Kazal-type serine protease inhibitors	8068429	3000605	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	PF00089	e6kbrA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)
B [auth C]	PF00050	e6kbrC1	A: few secondary structure elements	X: Kazal-type serine protease inhibitors-like	H: Kazal-type serine protease inhibitors (From Topology)	T: Kazal-type serine protease inhibitors	F: PF00050	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (utative)
B [auth C]	3.30.60.30	Alpha Beta	2-Layer Sandwich	Wheat Germ Agglutinin (Isolectin 2)	domain 1	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain
B [auth C]	PF00050	Kazal-type serine protease inhibitor domain (Kazal_1)	Kazal-type serine protease inhibitor domain	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containi ...	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containing three disulphides. Alignment also includes a single domain from transporters in the OATP/PGT family Swiss:P46721.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Kallikrein-4	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 cation binding ion binding binding metal ion binding small molecule binding	developmental process anatomical structure morphogenesis odontogenesis of dentin-containing tooth anatomical structure formation involved in morphogenesis anatomical structure development odontogenesis animal organ development amelogenesis animal organ morphogenesis biomineral tissue development tissue development cellular component organization cellular component disassembly extracellular matrix disassembly developmental process anatomical structure morphogenesis odontogenesis of dentin-containing tooth anatomical structure formation involved in morphogenesis anatomical structure development odontogenesis animal organ development amelogenesis animal organ morphogenesis biomineral tissue development tissue development cellular component organization cellular component disassembly extracellular matrix disassembly extracellular matrix organization cellular process cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process	extracellular region cellular anatomical entity membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle
B [auth C]	K41043	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	developmental process spermatid development spermatid differentiation sexual reproduction cellular developmental process spermatogenesis reproductive process multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction gamete generation male gamete generation cell differentiation anatomical structure development developmental process spermatid development spermatid differentiation sexual reproduction cellular developmental process spermatogenesis reproductive process multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction gamete generation male gamete generation cell differentiation anatomical structure development germ cell development cellular process cellular component assembly involved in morphogenesis cellular component organization cellular component biogenesis vesicle organization cellular anatomical entity morphogenesis cellular component assembly cellular component organization or biogenesis endomembrane system organization organelle assembly secretory granule organization anatomical structure morphogenesis organelle organization anatomical structure formation involved in morphogenesis acrosome assembly	extracellular region cellular anatomical entity acrosomal vesicle membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm extracellular region cellular anatomical entity acrosomal vesicle membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A	IPR001314	Peptidase S1A, chymotrypsin family	Family
A	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
A	IPR001254	Serine proteases, trypsin domain	Domain
A	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
A	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
B [auth C]	IPR042167	Serine protease inhibitor Kazal-type 2	Family
B [auth C]	IPR036058	Kazal domain superfamily	Homologous Superfamily
B [auth C]	IPR002350	Kazal domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: Q9Y5K2	amelogenesis imperfecta amelogenesis imperfecta type 2A1 large cell medulloblastoma ovarian cancer Amelogenesis Imperfecta hypomaturation type angioedema medulloblastoma prostate carcinoma hypertensive disorder osteosarcoma
B [auth C]	Pharos: P20155	age-related macular degeneration MALT lymphoma attention deficit hyperactivity disorder, inattentive type myocardial infarction heart disease osteosarcoma

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.