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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
Summary
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.