Transcription generates positively and negatively supercoiled domains in the template

Hai Young Wu, Shihua Shyy, James C. Wang, Leroy-Fong Liu

研究成果: 雜誌貢獻文章

503 引文 斯高帕斯(Scopus)

摘要

We show that transcription of a DNA molecule inside a bacterium is accompanied by local and temporal supercoiling of the DNA template: as transcription proceeds, DNA in front of the transcription ensemble becomes positively supercoiled, and DNA behind the ensemble becomes negatively supercoiled. Because bacterial gyrase and topoisomerase I act differently on positively and negatively supercoiled DNA, the formation of twin supercoiled domains during transcription is manifested by a large increase or decrease in the linking number of an intracellular plasmid when bacterial DNA gyrase or topoisomerase I, respectively, is inhibited. Such changes in linking number are strongly dependent on transcription of the plasmid in cis and on the relative orientations of transcription units on the plasmid. These results indicate that the state of supercoiling of bacterial DNA is strongly modulated by transcription, and that DNA topoisomerases are normally involved in the elongation step of transcription.

原文英語
頁(從 - 到)433-440
頁數8
期刊Cell
53
發行號3
DOIs
出版狀態已發佈 - 五月 6 1988
對外發佈Yes

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

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