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7SK small nuclear RNA binds to and inhibits the activity of CDK9/cyclin T complexes

Author

Listed:
  • Van Trung Nguyen

    (Génétique Moléculaire, UMR 8541 CNRS, Ecole Normale Supérieure)

  • Tamás Kiss

    (Laboratoire de Biologie Moléculaire Eucaryote du CNRS, Université Paul Sabatier)

  • Annemieke A. Michels

    (Génétique Moléculaire, UMR 8541 CNRS, Ecole Normale Supérieure)

  • Olivier Bensaude

    (Génétique Moléculaire, UMR 8541 CNRS, Ecole Normale Supérieure)

Abstract

The transcription of eukaryotic protein-coding genes involves complex regulation of RNA polymerase (Pol) II activity in response to physiological conditions and developmental cues. One element of this regulation involves phosphorylation of the carboxy-terminal domain (CTD) of the largest polymerase subunit by a transcription elongation factor, P-TEFb, which comprises the kinase CDK9 and cyclin T1 or T2 (ref. 1). Here we report that in human HeLa cells more than half of the P-TEFb is sequestered in larger complexes that also contain 7SK RNA, an abundant, small nuclear RNA (snRNA) of hitherto unknown function2,3. P-TEFb and 7SK associate in a specific and reversible manner. In contrast to the smaller P-TEFb complexes, which have a high kinase activity, the larger 7SK/P-TEFb complexes show very weak kinase activity. Inhibition of cellular transcription by chemical agents or ultraviolet irradiation trigger the complete disruption of the P-TEFb/7SK complex, and enhance CDK9 activity. The transcription-dependent interaction of P-TEFb with 7SK may therefore contribute to an important feedback loop modulating the activity of RNA Pol II.

Suggested Citation

  • Van Trung Nguyen & Tamás Kiss & Annemieke A. Michels & Olivier Bensaude, 2001. "7SK small nuclear RNA binds to and inhibits the activity of CDK9/cyclin T complexes," Nature, Nature, vol. 414(6861), pages 322-325, November.
    • Handle: RePEc:nat:nature:v:414:y:2001:i:6861:d:10.1038_35104581
    DOI: 10.1038/35104581
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    Cited by:

    1. Jennifer Porat & Moaine El Baidouri & Jorg Grigull & Jean-Marc Deragon & Mark A. Bayfield, 2022. "The methyl phosphate capping enzyme Bmc1/Bin3 is a stable component of the fission yeast telomerase holoenzyme," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    2. Ryan Damme & Kongpan Li & Minjie Zhang & Jianhui Bai & Wilson H. Lee & Joseph D. Yesselman & Zhipeng Lu & Willem A. Velema, 2022. "Chemical reversible crosslinking enables measurement of RNA 3D distances and alternative conformations in cells," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    3. Roberto Bandiera & Rebecca E. Wagner & Thiago Britto-Borges & Christoph Dieterich & Sabine Dietmann & Susanne Bornelöv & Michaela Frye, 2021. "RN7SK small nuclear RNA controls bidirectional transcription of highly expressed gene pairs in skin," Nature Communications, Nature, vol. 12(1), pages 1-14, December.
    4. Kaori Asamitsu & Takatsugu Hirokawa & Takashi Okamoto, 2017. "MD simulation of the Tat/Cyclin T1/CDK9 complex revealing the hidden catalytic cavity within the CDK9 molecule upon Tat binding," PLOS ONE, Public Library of Science, vol. 12(2), pages 1-14, February.

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