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| Content Provider | Springer Nature Link |
|---|---|
| Author | Antoniou, Antony N. Moore, Nel Dyson, Julian P. |
| Copyright Year | 2002 |
| Abstract | The proteasome is the major cytosolic protease, composed of a 20S catalytic core that associates with either the 19S (PA700) activator or the 11S (PA28) regulator complex. The 19S complex is thought to promote protein substrate unfolding and subsequent degradation, but precise functions for the individual subunits remain undefined. The chromatin structure and regulation of the S3 (P91A) subunit of the 19S activator was examined as a novel approach towards understanding its role in the complex. DNase I hypersensitivity (HS) analysis of S3 chromatin revealed a ubiquitous DNase I HS site mapping to the promoter region. Examination of the S3 chromatin structure in thymocytes, a dynamic population that undergo substantial proliferation, apoptosis, and differentiation, revealed an additional DNase I HS site mapping to the sixth intron of the genomic sequence. This second site was demonstrated to be associated with CD4+CD8+ double-positive (DP) but not CD4+ single-positive (SP) thymoma cell lines, and may correlate with a downregulation of S3 message. When a DP thymic cell line was induced to differentiate through retroviral transduction with Notch-1, the second DNase I HS site was dramatically diminished, illustrating that S3 chromatin is developmentally regulated during thymocyte positive selection. |
| Starting Page | 260 |
| Ending Page | 267 |
| Page Count | 8 |
| File Format | |
| ISSN | 00937711 |
| Journal | Immunogenetics |
| Volume Number | 54 |
| Issue Number | 4 |
| e-ISSN | 14321211 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2002-06-22 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Immunology |
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