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Pinning down transcription: regulation of RNA polymerase II activity during the cell cycle

Yu-Xin Xu1, James L Manley

  • 1Department of Biological Sciences, Columbia University, New York, New York 10027, USA.

Cell Cycle (Georgetown, Tex.)
|January 24, 2004
PubMed

Insights

Pin1, a mitotic regulator, directly influences RNA polymerase II (RNAP II) function. This interaction is key for gene silencing during mitosis and the transcription cycle.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Pin1 is a peptidyl-prolyl cis/trans isomerase regulating mitotic proteins.
  • Pin1 targets phosphorylated ser- or thr-pro dipeptides, common in proteins phosphorylated by cyclin-dependent kinases.
  • RNA polymerase II (RNAP II) is a potential target for Pin1 regulation due to its C-terminal domain structure.

Purpose of the Study:

  • To investigate the direct modulation of RNA polymerase II (RNAP II) by Pin1.
  • To elucidate the role of Pin1 in regulating RNAP II structure and function.
  • To explore Pin1's involvement in mitotic gene silencing and the transcription cycle.

Main Methods:

  • Summarizing existing research findings on Pin1 and RNAP II interaction.
  • Analyzing the structural features of RNAP II's C-terminal domain, including ser-pro dipeptides and phosphorylation patterns.
  • Reviewing evidence for Pin1's functional modulation of RNAP II.

Main Results:

  • Pin1 directly modulates the structure and function of RNAP II.
  • The C-terminal domain of RNAP II contains numerous ser-pro dipeptides susceptible to Pin1 activity.
  • Evidence suggests Pin1's role in regulating RNAP II activity.

Conclusions:

  • Pin1 directly interacts with and regulates RNA polymerase II (RNAP II).
  • This interaction is significant for both mitotic gene silencing and the broader transcription cycle.
  • Pin1's role extends beyond mitosis to fundamental transcriptional processes.

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