Cystatin B

"CSTB" redirects here. For another use, see Trade Union Confederation of Bolivian Workers.

Cystatin B, Human.

CSTB
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1STF, 2OCT, 4N6V
Identifiers
Aliases	CSTB, CST6, EPM1, EPM1A, PME, STFB, ULD, Cystatin B, CPI-B
External IDs	OMIM: 601145; MGI: 109514; HomoloGene: 79; GeneCards: CSTB; OMA:CSTB - orthologs
Gene location (Human) Chr. Chromosome 21 (human) Band 21q22.3 Start 43,772,511 bp End 43,776,330 bp
Gene location (Mouse) Chr. Chromosome 10 (mouse) Band 10 C1|10 39.72 cM Start 78,261,503 bp End 78,263,456 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in mucosa of pharynx oral cavity body of tongue gums gingival epithelium cervix epithelium amniotic fluid buccal mucosa cell vulva superior surface of tongue Top expressed in gastrula decidua thymus skin of abdomen conjunctival fornix transitional epithelium of urinary bladder endothelial cell of lymphatic vessel cornea ascending aorta corneal stroma More reference expression data BioGPS More reference expression data
Gene ontology Molecular function peptidase inhibitor activity protease binding endopeptidase inhibitor activity cysteine-type endopeptidase inhibitor activity RNA binding Cellular component cytoplasm nucleolus extracellular exosome intracellular anatomical structure nucleus extracellular region extracellular space cytosol secretory granule lumen tertiary granule lumen ficolin-1-rich granule lumen collagen-containing extracellular matrix Biological process adult locomotory behavior negative regulation of proteolysis negative regulation of peptidase activity negative regulation of endopeptidase activity neutrophil degranulation Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 1476 13014 Ensembl ENSG00000160213 ENSMUSG00000005054 UniProt P04080 Q62426 RefSeq (mRNA) NM_000100 NM_007793 RefSeq (protein) NP_000091 NP_031819 Location (UCSC) Chr 21: 43.77 – 43.78 Mb Chr 10: 78.26 – 78.26 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

Cystatin-B is a protein that in humans is encoded by the CSTB gene.

The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and kininogens. This gene encodes a stefin that functions as an intracellular cysteine protease inhibitor. The protein is able to form a dimer stabilized by noncovalent forces, inhibiting papain and cathepsins L, H and B. The protein is thought to play a role in protecting against the proteases leaking from lysosomes. Evidence indicates that mutations in this gene are responsible for the primary defects in patients with Unverricht–Lundborg disease, a form of progressive myoclonic epilepsy (EPM1).

Interactions

Cystatin B has been shown to interact with Cathepsin B.

Further reading

• Turk V, Bode W (1991). "The cystatins: protein inhibitors of cysteine proteinases". FEBS Lett. 285 (2): 213–9. doi:10.1016/0014-5793(91)80804-C. PMID 1855589. S2CID 40444629.
• Järvinen M, Rinne A, Hopsu-Havu VK (1988). "Human cystatins in normal and diseased tissues--a review". Acta Histochem. 82 (1): 5–18. doi:10.1016/s0065-1281(87)80043-0. PMID 3122506.
• Brown WM, Dziegielewska KM (1997). "Friends and relations of the cystatin superfamily--new members and their evolution". Protein Sci. 6 (1): 5–12. doi:10.1002/pro.5560060102. PMC 2143511. PMID 9007972.
• Kos J, Lah TT (1998). "Cysteine proteinases and their endogenous inhibitors: target proteins for prognosis, diagnosis and therapy in cancer (review)". Oncol. Rep. 5 (6): 1349–61. doi:10.3892/or.5.6.1349. PMID 9769367.
• Stubbs MT, Laber B, Bode W, et al. (1990). "The refined 2.4 A X-ray crystal structure of recombinant human stefin B in complex with the cysteine proteinase papain: a novel type of proteinase inhibitor interaction". EMBO J. 9 (6): 1939–47. doi:10.1002/j.1460-2075.1990.tb08321.x. PMC 551902. PMID 2347312.
• Jerala R, Trstenjak M, Lenarcic B, Turk V (1988). "Cloning a synthetic gene for human stefin B and its expression in E. coli". FEBS Lett. 239 (1): 41–4. doi:10.1016/0014-5793(88)80541-6. PMID 3053245. S2CID 33859701.
• Lenarcic B, Kos J, Dolenc I, et al. (1988). "Cathepsin D inactivates cysteine proteinase inhibitors, cystatins". Biochem. Biophys. Res. Commun. 154 (2): 765–72. doi:10.1016/0006-291X(88)90206-9. PMID 3261170.
• Ritonja A, Machleidt W, Barrett AJ (1985). "Amino acid sequence of the intracellular cysteine proteinase inhibitor cystatin B from human liver". Biochem. Biophys. Res. Commun. 131 (3): 1187–92. doi:10.1016/0006-291X(85)90216-5. PMID 3902020.
• Spiess E, Brüning A, Gack S, et al. (1994). "Cathepsin B activity in human lung tumor cell lines: ultrastructural localization, pH sensitivity, and inhibitor status at the cellular level". J. Histochem. Cytochem. 42 (7): 917–29. doi:10.1177/42.7.8014475. PMID 8014475. S2CID 24509312.
• Lehesjoki AE, Koskiniemi M, Norio R, et al. (1993). "Localization of the EPM1 gene for progressive myoclonus epilepsy on chromosome 21: linkage disequilibrium allows high resolution mapping". Hum. Mol. Genet. 2 (8): 1229–34. doi:10.1093/hmg/2.8.1229. PMID 8104628.
• Pennacchio LA, Myers RM (1997). "Isolation and characterization of the mouse cystatin B gene". Genome Res. 6 (11): 1103–9. doi:10.1101/gr.6.11.1103. PMID 8938434.
• Lalioti MD, Mirotsou M, Buresi C, et al. (1997). "Identification of mutations in cystatin B, the gene responsible for the Unverricht-Lundborg type of progressive myoclonus epilepsy (EPM1)". Am. J. Hum. Genet. 60 (2): 342–51. PMC 1712389. PMID 9012407.
• Lafrenière RG, Rochefort DL, Chrétien N, et al. (1997). "Unstable insertion in the 5' flanking region of the cystatin B gene is the most common mutation in progressive myoclonus epilepsy type 1, EPM1". Nat. Genet. 15 (3): 298–302. doi:10.1038/ng0397-298. PMID 9054946. S2CID 21180258.
• Virtaneva K, D'Amato E, Miao J, et al. (1997). "Unstable minisatellite expansion causing recessively inherited myoclonus epilepsy, EPM1". Nat. Genet. 15 (4): 393–6. doi:10.1038/ng0497-393. PMID 9090386. S2CID 24971949.
• Bespalova IN, Adkins S, Pranzatelli M, Burmeister M (1997). "Novel cystatin B mutation and diagnostic PCR assay in an Unverricht-Lundborg progressive myoclonus epilepsy patient" (PDF). Am. J. Med. Genet. 74 (5): 467–71. doi:10.1002/(SICI)1096-8628(19970919)74:5<467::AID-AJMG1>3.0.CO;2-L. hdl:2027.42/38271. PMID 9342192.

External links

• GeneReviews/NCBI/NIH/UW entry on Unverricht-Lundborg Disease or EPM1
• The MEROPS online database for peptidases and their inhibitors: I25.003
• PDBe-KB provides an overview of all the structure information available in the PDB for Human Cystatin-B