In vitro transcription of chromatin containing histones hyperacetylated in vivo
| Autor: | Michael E. Dobson, Vernon M. Ingram |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Histone-modifying enzymes
Transcription Genetic biology Acetylation RNA polymerase II DNA-Directed RNA Polymerases Templates Genetic Molecular biology Chromatin Histones chemistry.chemical_compound Histone chemistry Transcription (biology) RNA polymerase Escherichia coli Genetics biology.protein Humans RNA polymerase II holoenzyme Polymerase HeLa Cells |
| Zdroj: | Nucleic Acids Research. 8:4201-4220 |
| ISSN: | 1362-4962 0305-1048 |
| DOI: | 10.1093/nar/8.18.4201 |
| Popis: | The culture of cells in the presence of sodium n-butyrate causes an accumulation of histones that are highly acetylated. When chromatin containing these histones was transcribed with E. coli RNA polymerase, an increase in the template activity compared to control chromatin was observed. Titration of chromatin with polymerase under both reinitiating and non-reinitiating conditions showed there was no increase in the number of regions available for transcription. Comparison of the kinetics for single and multiple rounds of transcription indicated that the rate of elongation was increased and probably the rate of reinitiation as well. Comparison of the size of transcripts from control and acetylated chromatin showed a small increase in the average size of transcripts from acetylated chromatin. When transcription was compared using partially purified HeLa polymerase, an increase was also seen. Studies under various ionic conditions showed that control chromatin required a higher salt concentration for optimum activity than did acetylated chromatin. In addition, at the optimum salt concentration for each chromatin, there was very little difference in the transcriptional activity using exogenous HeLa RNA polymerase. |
| Databáze: | OpenAIRE |
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