Functional characterization of TIP60 sumoylation in UV-irradiated DNA damage response

Oncogene. 2008 Feb 7;27(7):931-41. doi: 10.1038/sj.onc.1210710. Epub 2007 Aug 20.


The histone acetyltransferase TIP60 regulates the DNA damage response following genotoxic stress by acetylating histone and remodeling chromatin. However, the molecular mechanisms underlying the TIP60-dependent response to UV-induced DNA damage remain poorly understood. To systematically analyse proteins that regulate TIP60 activity in response to UV irradiation, we performed a proteomic analysis of proteins selectively bound to TIP60 in response to UV irradiation using mass spectrometry and identified a novel regulatory mechanism by which TIP60 orchestrates transcriptional activation of p53-dependent checkpoint response in UV-irradiated cells. The initial step of this pathway involves UV-induced association of TIP60 with SUMO-conjugation enzymes and site-specific sumoylation of TIP60 at lysines 430 and 451 via Ubc9. This sumoylation initiates the relocation of TIP60 from nucleoplasm to the promyelocytic leukemia body, which is essential for the UV-irradiated DNA damage repair response via a p53-dependent pathway. Significantly, inhibition of TIP60 sumoylation by overexpression of non-sumoylatable mutant abrogates the p53-dependent DNA damage response, demonstrating the importance of TIP60 sumoylation in response to UV irradiation. Our biochemical characterization demonstrated that the sumoylation of TIP60 augments its acetyltransferase activity in vitro and in vivo. Thus, this study shed new light on the function and regulation of TIP60 activity in UV-irradiated DNA damage response.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bone Neoplasms / metabolism
  • Bone Neoplasms / pathology
  • Cell Nucleus / metabolism*
  • Cells, Cultured / radiation effects
  • Cysteine Endopeptidases / metabolism
  • DNA Damage / physiology
  • DNA Damage / radiation effects*
  • Electrophoresis, Polyacrylamide Gel
  • HeLa Cells
  • Histone Acetyltransferases / antagonists & inhibitors
  • Histone Acetyltransferases / metabolism*
  • Humans
  • Kidney / metabolism
  • Kidney / pathology
  • Lysine / chemistry
  • Lysine Acetyltransferase 5
  • Mass Spectrometry
  • Osteosarcoma / metabolism
  • Osteosarcoma / pathology
  • Protein Processing, Post-Translational*
  • Proteomics
  • RNA, Small Interfering / pharmacology
  • SUMO-1 Protein
  • Small Ubiquitin-Related Modifier Proteins / metabolism*
  • Tumor Suppressor Protein p53 / metabolism
  • Ubiquitin-Conjugating Enzymes / metabolism
  • Ultraviolet Rays*


  • RNA, Small Interfering
  • SUMO-1 Protein
  • SUMO1 protein, human
  • Small Ubiquitin-Related Modifier Proteins
  • Tumor Suppressor Protein p53
  • Histone Acetyltransferases
  • KAT5 protein, human
  • Lysine Acetyltransferase 5
  • Ubiquitin-Conjugating Enzymes
  • Cysteine Endopeptidases
  • SENP6 protein, human
  • ubiquitin-conjugating enzyme UBC9
  • Lysine