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Nucleosomal Fluctuations Govern the Transcription Dynamics of RNA Polymerase II

  1. Author:
    Hodges, C.
    Bintu, L.
    Lubkowska, L.
    Kashlev, M.
    Bustamante, C.

  2. Author Address

    Hodges, Courtney, Bustamante, Carlos] Univ Calif Berkeley, Jason L Choy Lab Single Mol Biophys, Berkeley, CA 94720 USA. [Hodges, Courtney, Bustamante, Carlos] Univ Calif Berkeley, Biophys Grad Grp, Berkeley, CA 94720 USA. [Bintu, Lacramioara, Bustamante, Carlos] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. [Lubkowska, Lucyna, Kashlev, Mikhail] NCI, Frederick Canc Res & Dev Ctr, NCI Ctr Canc Res, Frederick, MD 21702 USA. [Bustamante, Carlos] Univ Calif Berkeley, Howard Hughes Med Inst, Dept Chem & Mol & Cell Biol, Berkeley, CA 94720 USA.
    1. Year: 2009
  2. Journal: Science
    1. 325
    2. 5940
    3. Pages: 626-628
  4. Type of Article: Article
  1. Abstract:

    RNA polymerase II (Pol II) must overcome the barriers imposed by nucleosomes during transcription elongation. We have developed an optical tweezers assay to follow individual Pol II complexes as they transcribe nucleosomal DNA. Our results indicate that the nucleosome behaves as a fluctuating barrier that locally increases pause density, slows pause recovery, and reduces the apparent pause-free velocity of Pol II. The polymerase, rather than actively separating DNA from histones, functions instead as a ratchet that rectifies nucleosomal fluctuations. We also obtained direct evidence that transcription through a nucleosome involves transfer of the core histones behind the transcribing polymerase via a transient DNA loop. The interplay between polymerase dynamics and nucleosome fluctuations provides a physical basis for the regulation of eukaryotic transcription.

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  2. DOI: 10.1126/science.1172926
  3. PMID: 19644123

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