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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Smith, M. R. Greene, W. C. |
| Description | Author Affiliation: Smith MR ( Howard Hughes Medical Institut, Department of Medicine, Duke University Medical Center, Durham, NC 27710.); |
| Abstract | We have investigated the biochemical basis for negative regulation of interleukin 2 receptor alpha-chain (IL-2R alpha) gene expression. Transient transfection studies employing internally deleted forms of the IL-2R alpha promoter localized a negative regulatory element (NRE) between nucleotides -400 and -368 relative to the major distal transcription start (cap) site. This 31-base-pair (bp) element is involved in the attenuation of both basal and inducible IL-2R alpha promoter activity. Comparison of this IL-2R alpha NRE with other known regulatory motifs revealed an 11-bp core element (TTCATCCCAGG) that was strikingly similar to a protein-binding domain within the long terminal repeat of the type 1 human immunodeficiency virus (HIV-1). This viral domain has been previously implicated in the negative control of HIV-1 gene expression. In vitro protein-DNA binding studies demonstrated that the same constitutively expressed approximately 50-kDa protein (SP-50) specifically bound to both the IL-2R alpha and HIV-1 NRE core elements. Mutation of the 11-bp IL-2R alpha NRE core element, which disrupted protein binding, significantly augmented basal as well as Tax protein- or phorbol ester-induced IL-2R alpha promoter activity in vivo, suggesting that SP-50 functions as a transcriptional silencer. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 86 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1989-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | DNA-Binding Proteins Metabolism Genes HIV-1 Genetics Receptors, Interleukin-2 Regulatory Sequences, Nucleic Acid Repetitive Sequences, Nucleic Acid Cell Line Chromosome Deletion DNA DNA, Viral Isolation & Purification Macromolecular Substances Molecular Weight Mutation T-Lymphocytes Immunology Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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