1BIK

X-RAY STRUCTURE OF BIKUNIN FROM THE HUMAN INTER-ALPHA-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)
A	d1bika1	Small proteins	BPTI-like	BPTI-like	Small Kunitz-type inhibitors & BPTI-like toxins	Bikunin from inter-alpha-inhibitor complex	(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	SCOP2 Family	Small Kunitz-type inhibitors & BPTI-like toxins	8026168	4003337	SCOP2 (2022-06-29)
A	SCOP2 Family	Small Kunitz-type inhibitors & BPTI-like toxins	8026169	4003337	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	BPTI-like	8038547	3000628	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	BPTI-like	8038548	3000628	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	Kunitz_BPTI	e1bikA1	A: few secondary structure elements	X: BPTI-like (From Topology)	H: BPTI-like (From Topology)	T: BPTI-like	F: Kunitz_BPTI	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	4.10.410.10	Few Secondary Structures	Irregular	Factor Xa Inhibitor	Pancreatic trypsin inhibitor Kunitz domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00014	Kunitz/Bovine pancreatic trypsin inhibitor domain (Kunitz_BPTI)	Kunitz/Bovine pancreatic trypsin inhibitor domain	Indicative of a protease inhibitor, usually a serine protease inhibitor. Structure is a disulfide rich alpha+beta fold. BPTI (bovine pancreatic trypsin inhibitor) is an extensively studied model structure. Certain family members are similar to the ...	Indicative of a protease inhibitor, usually a serine protease inhibitor. Structure is a disulfide rich alpha+beta fold. BPTI (bovine pancreatic trypsin inhibitor) is an extensively studied model structure. Certain family members are similar to the tick anticoagulant peptide (TAP, Swiss:P17726). This is a highly selective inhibitor of factor Xa in the blood coagulation pathways [1]. TAP molecules are highly dipolar [2], and are arranged to form a twisted two- stranded antiparallel beta-sheet followed by an alpha helix [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	BIKUNIN	oxidoreductase activity catalytic activity binding carbohydrate binding 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 identical protein binding oxidoreductase activity catalytic activity binding carbohydrate binding 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 identical protein binding protein binding protein homodimerization activity protein dimerization activity tetrapyrrole binding heme binding channel regulator activity transporter inhibitor activity calcium channel inhibitor activity ion channel inhibitor activity ion channel regulator activity calcium channel regulator activity transporter regulator activity channel inhibitor activity organic acid binding ion binding anion binding calcium oxalate binding carboxylic acid binding small molecule binding protein-containing complex binding immunoglobulin binding IgA binding	multi-multicellular organism process multicellular organismal process reproductive process female pregnancy multi-organism reproductive process regulation of biological process response to stimulus immune response negative regulation of response to stimulus negative regulation of immune response biological regulation negative regulation of biological process regulation of response to stimulus negative regulation of immune system process multi-multicellular organism process multicellular organismal process reproductive process female pregnancy multi-organism reproductive process regulation of biological process response to stimulus immune response negative regulation of response to stimulus negative regulation of immune response biological regulation negative regulation of biological process regulation of response to stimulus negative regulation of immune system process immune system process regulation of immune response regulation of immune system process cellular response to stimulus regulation of cellular process signaling negative regulation of signaling negative regulation of intracellular signal transduction regulation of signal transduction intracellular signal transduction negative regulation of cell communication cell communication negative regulation of JNK cascade regulation of intracellular signal transduction JNK cascade intracellular signaling cassette negative regulation of cellular process signal transduction regulation of signaling regulation of JNK cascade regulation of MAPK cascade negative regulation of signal transduction MAPK cascade regulation of cell communication cellular process negative regulation of MAPK cascade pigment catabolic process pigment metabolic process heme metabolic process catabolic process tetrapyrrole metabolic process heme catabolic process porphyrin-containing compound catabolic process metabolic process porphyrin-containing compound metabolic process tetrapyrrole catabolic process cell adhesion	membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope cellular anatomical structure organelle mitochondrial envelope cytoplasm membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope cellular anatomical structure organelle mitochondrial envelope cytoplasm organelle membrane nuclear membrane nucleus endomembrane system nuclear envelope extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space vesicle extracellular membrane-bounded organelle cell periphery extracellular matrix external encapsulating structure collagen-containing extracellular matrix cell surface cytosol plasma membrane blood microparticle endoplasmic reticulum

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002968	Alpha-1-microglobulin	Family
A	IPR002223	Pancreatic trypsin inhibitor Kunitz domain	Domain
A	IPR012674	Calycin	Homologous Superfamily
A	IPR029856	Protein AMBP	Family
A	IPR000566	Lipocalin/cytosolic fatty-acid binding domain	Domain
A	IPR022272	Lipocalin family conserved site	Conserved Site
A	IPR020901	Proteinase inhibitor I2, Kunitz, conserved site	Conserved Site
A	IPR036880	Pancreatic trypsin inhibitor Kunitz domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P02760	transitional cell carcinoma Neoplasm Invasiveness acute kidney failure drug-induced liver injury pancreatic intraductal papillary-mucinous neoplasm hereditary coproporphyria osteoarthritis pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia pancreatic intraductal papillary-mucinous carcinoma

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.