2OCT | pdb_00002oct

Stefin B (Cystatin B) tetramer

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	d2octb_	Alpha and beta proteins (a+b)	Cystatin-like	Cystatin/monellin	Cystatins	automated matches	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d2octa_	Alpha and beta proteins (a+b)	Cystatin-like	Cystatin/monellin	Cystatins	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)
B	SCOP2B Superfamily	Cystatin/monellin	8034637	3000441	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Cystatin/monellin	8034637	3000441	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)
B		e2octB1	A: HTH	X: HTH	H: tetra-helical, lambda repressor-like	T: HTHP	F:	ECOD (20:10:01)
A		e2octA1	A: Profilin-like	X: Immunoglobulin-related	H: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	T: Cystatin	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.10.450.10	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)
A	3.10.450.10	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00031	Cystatin domain (Cystatin)	Cystatin domain	Very diverse family. Attempts to define separate sub-families failed. Typically, either the N-terminal or C-terminal end is very divergent. But splitting into two domains would make very short families. All members except Swiss:Q03196 and Swiss:Q1 ...	Very diverse family. Attempts to define separate sub-families failed. Typically, either the N-terminal or C-terminal end is very divergent. But splitting into two domains would make very short families. All members except Swiss:Q03196 and Swiss:Q10993 are found. Pfam:PF00666 are related to this family but have not been included.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Cystatin B	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity protein binding binding enzyme binding protease binding RNA binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity protein binding binding enzyme binding protease binding RNA binding nucleic acid binding	adult locomotory behavior behavior multicellular organismal process adult behavior locomotory behavior regulation of biological process negative regulation of proteolysis regulation of cellular process regulation of protein metabolic process negative regulation of metabolic process biological regulation negative regulation of biological process primary metabolic process regulation of macromolecule metabolic process adult locomotory behavior behavior multicellular organismal process adult behavior locomotory behavior regulation of biological process negative regulation of proteolysis regulation of cellular process regulation of protein metabolic process negative regulation of metabolic process biological regulation negative regulation of biological process primary metabolic process regulation of macromolecule metabolic process regulation of primary metabolic process regulation of proteolysis proteolysis negative regulation of cellular process metabolic process cellular process protein metabolic process macromolecule metabolic process regulation of metabolic process negative regulation of protein metabolic process negative regulation of macromolecule metabolic process	membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membraneless organelle intracellular membrane-bounded organelle nucleolus intracellular organelle lumen intracellular organelle cellular anatomical structure organelle lumen organelle membraneless organelle nuclear lumen membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membraneless organelle intracellular membrane-bounded organelle nucleolus intracellular organelle lumen intracellular organelle cellular anatomical structure organelle lumen organelle membraneless organelle nuclear lumen tertiary granule lumen intracellular vesicle endomembrane system tertiary granule cytoplasmic vesicle secretory granule secretory vesicle cytoplasm vesicle extracellular region extracellular exosome extracellular vesicle extracellular organelle extracellular space extracellular membrane-bounded organelle vesicle lumen cytoplasmic vesicle lumen secretory granule lumen cytosol cell periphery extracellular matrix external encapsulating structure ficolin-1-rich granule ficolin-1-rich granule lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR018073	Proteinase inhibitor I25, cystatin, conserved site	Conserved Site
A, B	IPR001713	Proteinase inhibitor I25A, stefin	Family
A, B	IPR000010	Cystatin domain	Domain
A, B	IPR046350	Cystatin superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P04080	Unverricht-Lundborg syndrome meningioma esophageal squamous cell carcinoma glioblastoma secretory meningioma transitional meningioma microcystic meningioma benign meningioma clear cell meningioma spinal meningioma intraorbital meningioma angiomatous meningioma olfactory groove meningioma parasagittal meningioma fibrous meningioma Unverricht-Lundborg syndrome meningioma esophageal squamous cell carcinoma glioblastoma secretory meningioma transitional meningioma microcystic meningioma benign meningioma clear cell meningioma spinal meningioma intraorbital meningioma angiomatous meningioma olfactory groove meningioma parasagittal meningioma fibrous meningioma psammomatous meningioma intraventricular meningioma meningothelial meningioma Neoplasm Invasiveness cerebral convexity meningioma giant cell glioblastoma large cell medulloblastoma lymphoplasmacyte-rich meningioma neurodegenerative disease ovarian cancer epilepsy papillary meningioma progressive myoclonus epilepsy intellectual disability lung adenocarcinoma nasopharyngeal carcinoma breast cancer cutaneous lupus erythematosus pancreatic ductal adenocarcinoma interstitial cystitis subependymal giant cell astrocytoma lung cancer malignant pancreatic neoplasm osteosarcoma Down syndrome pancreatic intraductal papillary-mucinous neoplasm esophageal adenocarcinoma psoriasis

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.