Poly(dA).poly(dT) rich sequences are not sufficient to exclude nucleosome formation in a constitutive yeast promoter
Autor: | Stefano Omari, Riccardo Losa, Fritz Thoma |
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Rok vydání: | 1990 |
Předmět: |
Saccharomyces cerevisiae
Molecular Sequence Data chemistry.chemical_compound Polydeoxyribonucleotides Poly dA-dT Genetics Nucleosome Promoter Regions Genetic Nuclease biology Base Sequence Chromosome Mapping Promoter DNA biology.organism_classification Molecular biology Yeast Chromatin Nucleosomes chemistry biology.protein Chromosomes Fungal Thymidine |
Zdroj: | Nucleic acids research. 18(12) |
ISSN: | 0305-1048 |
Popis: | It was suggested that poly(dA).poly(dT) rich sequences in yeast Saccharomyces cerevisiae act as elements of constitutive promoters by exclusion of nucleosomes (Struhl, K. (1985). Proc. Natl. Acad. Sci. USA 82, 8419-8423). We have mapped the chromatin structure of the pet56-his3-ded1 region in minichromosomes and show that the poly(dA).poly(dT) sequences are located in nuclease sensitive regions. DNA fragments from the nuclease sensitive promoter region of DED1 were used for nucleosome reconstitution in vitro. We show that all sequences can form nucleosome cores and that the poly(dA).poly(dT) sequence can be incorporated in nucleosome cores. The results suggest that the nuclease sensitivity found in vivo is not established by poly(dA).poly(dT) mediated exclusion of nucleosomes. |
Databáze: | OpenAIRE |
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