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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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PRMT5 is required for cell-cycle progression and p53 tumor suppressor function.

A Scoumanne1, J Zhang, X Chen

  • 1Center for Comparative Oncology, University of California at Davis, CA 95616, USA.

Nucleic Acids Research
|June 17, 2009
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Summary

Protein arginine methyltransferase 5 (PRMT5) is crucial for cell survival by regulating translation initiation factor eIF4E and p53 protein synthesis. PRMT5 deficiency halts cell proliferation and triggers cell-cycle arrest.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Protein arginine methyltransferases (PRMTs) modify proteins involved in critical cellular functions.
  • The tumor suppressor p53 regulates cellular responses to stress, with its activity modulated by post-translational modifications.
  • The interplay between PRMTs and p53 function in cellular processes remains to be fully elucidated.

Purpose of the Study:

  • To investigate the role of PRMTs, specifically PRMT1, CARM1, and PRMT5, in modulating p53 function and cellular processes.
  • To determine the impact of PRMT5 deficiency on cell proliferation, cell-cycle progression, and p53-mediated responses.

Main Methods:

  • Generation of inducible knockdown cell lines for PRMT1, CARM1, and PRMT5.
  • Analysis of cell proliferation, cell-cycle arrest (G1 phase), and expression of p53 and its targets (MDM2, p21) upon DNA damage.
  • Assessment of p53 protein synthesis and regulation of translation initiation factor eIF4E.

Main Results:

  • PRMT5, but not PRMT1 or CARM1, is essential for cell proliferation; PRMT5 deficiency causes G1 cell-cycle arrest.
  • PRMT5 is required for p53 expression and induction of p53 targets (MDM2, p21) following DNA damage.
  • PRMT5 knockdown inhibits p53 protein synthesis and regulates eIF4E expression, with growth suppression dependent on eIF4E but independent of p53.

Conclusions:

  • Arginine methyltransferase PRMT5 acts as a key pro-survival factor.
  • PRMT5 regulates eIF4E expression and p53 translation, impacting cell proliferation and stress responses.
  • PRMT5 is a critical regulator of cellular homeostasis through its control over protein synthesis and tumor suppressor pathways.