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- W1974734522 abstract "We have previously shown that nucleosomes act as a strong barrier to yeast RNA polymerase II (Pol II) in vitro and that transcription through the nucleosome results in the loss of an H2A/H2B dimer. Here, we demonstrate that Escherichia coli RNA polymerase (RNAP), which never encounters chromatin in vivo, behaves similarly to Pol II in all aspects of transcription through the nucleosome in vitro. The nucleosome-specific pausing pattern of RNAP is comparable with that of Pol II. At physiological ionic strength or lower, the nucleosome blocks RNAP progression along the template, but this barrier can be relieved at higher ionic strength. Transcription through the nucleosome by RNAP results in the loss of an H2A/H2B dimer, and the histones that remain in the hexasome retain their original positions on the DNA. The results were similar for elongation complexes that were assembled from components (oligonucleotides and RNAP) and elongation complexes obtained by initiation from the promoter. The data suggest that eukaryotic Pol II and E. coli RNAP utilize very similar mechanisms for transcription through the nucleosome. Thus, bacterial RNAP can be used as a suitable model system to study general aspects of chromatin transcription by Pol II. Furthermore, the data argue that the general elongation properties of polymerases may determine the mechanism used for transcription through the nucleosome." @default.
- W1974734522 created "2016-06-24" @default.
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- W1974734522 date "2003-09-01" @default.
- W1974734522 modified "2023-10-12" @default.
- W1974734522 title "Bacterial Polymerase and Yeast Polymerase II Use Similar Mechanisms for Transcription through Nucleosomes" @default.
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- W1974734522 doi "https://doi.org/10.1074/jbc.m305647200" @default.
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