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The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. Incorporated instead of PSMB5 or PSMB8, this unit reduces the chymotrypsin-like activity of the proteasome. Plays a pivotal role in development of CD8-positive T cells.
Gene References into Functions
We analysed thymic tissues from patients with trisomy 13 (n = 4), trisomy 18 (n = 14) and trisomy 21 (n = 13) for histological alterations, and for the expression of functionally important molecules such as beta5t, a thymoproteasome subunit, and cathepsins. PMID: 25556590
Histological diversity of type AB thymoma correlates with expression of a functional marker beta5t and abundance of TdT-positive lymphocytes. PMID: 24293611
provide the first evidence that the mechanism underlying BTZ resistance in these tumor cells is impaired binding of BTZ to the mutant beta5 subunit of the proteasome PMID: 21941364
Proteasome beta5t is expressed in most type B and in some type AB thymomas and is a marker useful in differentiating type B3 thymomas from thymic carcinomas when used in combination with other diagnostic markers. PMID: 21836487
results suggest a key role for beta5t in generating the MHC class I-restricted CD8(+) T cell repertoire during thymic selection PMID: 17540904
Human beta5t was expressed in approximately 80% of cortical thymic epithelial cells and some cortical dendritic cells PMID: 19289856