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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lee, M. S. Garrard, W. T. |
| Description | Author Affiliation: Lee MS ( Department of Microbiology, University of Ulsan, Kyongnam, Korea.); |
| Abstract | DNase I-hypersensitive sites represent 'nucleosome-free' regions in chromatin where the underlying DNA sequence is highly accessible to trans-acting proteins. Here we demonstrate that it is possible to uncouple gene activity from hypersensitive site formation. Point or substitution mutations were introduced into the promoter of the yeast chromosomal HSP82 gene, encoding the 83-kDa heat shock protein (HSP), via site-directed integration. Mutating either the TATA box or heat shock element 1 (HSE1) significantly reduced basal and heat-induced transcription while mutating both essentially inactivated expression. Dormant transcription units exhibited arrays of sequence-positioned nucleosomes; nevertheless, the inactivated genes still retained a hypersensitive site within their mutated promoters. In addition, all yeast strains maintained a heat-inducible hypersensitive site at -600 base pairs (bp), while several mutant strains converted a constitutive hypersensitive site at -300 bp into a heat-inducible one. Thus, mutations in cis-acting elements within a promoter can inactivate transcription without eliminating nucleosome-free regions. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 19 |
| Volume Number | 89 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1992-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Gene Expression Regulation, Fungal Genes, Fungal Heat-Shock Proteins Genetics Mutagenesis, Site-Directed Promoter Regions, Genetic Saccharomyces Cerevisiae Transcription, Genetic Alleles Binding Sites DNA, Fungal Metabolism Deoxyribonuclease I Hot Temperature Kinetics Molecular Sequence Data Oligodeoxyribonucleotides RNA, Messenger TATA Box Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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