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Modulation of p53 function by SET8-mediated methylation at lysine 382.

Reversible covalent methylation of lysine residues on histone proteins constitutes a principal molecular mechanism that links chromatin states to diverse biological outcomes. Recently, lysine methylation has been observed on nonhistone proteins, suggesting broad cellular roles for the enzymes generating and removing methyl moieties. Here we report that the lysine methyltransferase enzyme SET8/PR-Set7 regulates the tumor suppressor protein p53. We find that SET8 specifically monomethylates p53 at lysine 382 (p53K382me1). This methylation event robustly suppresses p53-mediated transcription activation of highly responsive target genes but has little influence on weak targets. Further, depletion of SET8 augments the proapoptotic and checkpoint activation functions of p53, and accordingly, SET8 expression is downregulated upon DNA damage. Together, our study identifies SET8 as a p53-modifying enzyme, identifies p53K382me1 as a regulatory posttranslational modification of p53, and begins to dissect how methylation may contribute to a dynamic posttranslational code that modulates distinct p53 functions.

Pubmed ID: 17707234

Authors

  • Shi X
  • Kachirskaia I
  • Yamaguchi H
  • West LE
  • Wen H
  • Wang EW
  • Dutta S
  • Appella E
  • Gozani O

Journal

Molecular cell

Publication Data

August 17, 2007

Associated Grants

  • Agency: NIGMS NIH HHS, Id: R01 GM079641
  • Agency: NIGMS NIH HHS, Id: R01 GM079641-02
  • Agency: Intramural NIH HHS, Id: Z01 BC005599-17

Mesh Terms

  • Amino Acid Sequence
  • Antibodies
  • Cell Line, Tumor
  • DNA Damage
  • Histone-Lysine N-Methyltransferase
  • Humans
  • Lysine
  • Methylation
  • Models, Biological
  • Molecular Sequence Data
  • RNA Interference
  • Substrate Specificity
  • Transcriptional Activation
  • Tumor Suppressor Protein p53