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DNA-damage-responsive acetylation of pRb regulates binding to E2F-1

Douglas Markham1, Shonagh Munro, Judith Soloway

  • 1Laboratory of Cancer Biology, Nuffield Department of Clinical Laboratory Sciences, Medical Sciences Division, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK.

EMBO Reports
|December 24, 2005
PubMed

Insights

DNA damage triggers acetylation of retinoblastoma protein (pRb) at K873/874. This modification regulates pRb

Area of Science:

  • Cellular regulation
  • Tumor suppression
  • DNA damage response

Background:

  • Retinoblastoma protein (pRb) is a key regulator of the G1 to S-phase cell cycle transition.
  • pRb activity is controlled by phosphorylation by cyclin-dependent kinases.
  • Acetylation of pRb at lysine residues 873/874 (pRb K873/874) inhibits phosphorylation, maintaining pRb's growth-suppressive function.

Purpose of the Study:

  • To investigate the role of pRb K873/874 acetylation in response to DNA damage.
  • To determine how pRb acetylation affects its interaction with E2F-1.

Main Methods:

  • Investigated pRb K873/874 acetylation in response to DNA damage.
  • Analyzed the effect of acetylation on the pRb-E2F-1 interaction.

Main Results:

  • pRb K873/874 acetylation occurs following DNA damage.
  • Acetylation of pRb K873/874 regulates the interaction between pRb and E2F-1.
  • This interaction is modulated by the C-terminal E2F-1-specific domain of pRb.

Conclusions:

  • pRb acetylation plays a novel role in DNA damage signaling pathways.
  • DNA-damage-dependent acetylation of pRb controls its interaction with E2F-1.
  • This mechanism offers new insights into cell cycle regulation and tumor suppression.

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