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Histone density is maintained during transcription mediated by the chromatin remodeler RSC and histone chaperone NAP1 in vitro
Benjamin G. Kuryan, Jessica Kim, Nancy Nga H. Tran, Sarah R. Lombardo, Swaminathan Venkatesh, Jerry L. Workman and Michael Carey
Proceedings of the National Academy of Sciences of the United States of America
Vol. 109, No. 6 (February 7, 2012), pp. 1931-1936
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/41477050
Page Count: 6
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ATPases and histone chaperones facilitate RNA polymerase II (pol II) elongation on chromatin. In vivo, the coordinated action of these enzymes is necessary to permit pol II passage through a nucleosome while restoring histone density afterward. We have developed a biochemical system recapitulating this basic process. Transcription through a nucleosome in vitro requires the ATPase remodels structure of chromatin (RSC) and the histone chaperone nucleosome assembly protein 1 (NAP1). In the presence of NAP1, RSC generates a hexasome. Despite the propensity of RSC to evict histories, NAP1 reprograms the reaction such that the hexasome is retained on the template during multiple rounds of transcription. This work has implications toward understanding the mechanism of pol II elongation on chromatin.
Proceedings of the National Academy of Sciences of the United States of America © 2012 National Academy of Sciences