E6AP promotes the degradation of the PML tumor suppressor.


Journal Article

The promyelocytic leukemia (PML) tumor suppressor is essential for the formation of PML nuclear bodies (NBs). PML and PML-NBs have been implicated in the regulation of growth inhibition, senescence and apoptosis. PML is activated in response to stress signals and is downregulated in certain human cancers. However, the factors mediating PML stability are incompletely understood. Here we demonstrate that a catalytically active form of the mammalian E3 ligase E6AP (HPV E6-associated protein) acts to reduce the half-life of the PML protein by promoting its degradation in the proteasome. E6AP mediates the ubiquitination of PML in an in vitro ubiquitination assay. E6AP and PML interact at physiological levels and colocalize in PML-NBs. Importantly, PML protein expression is elevated in multiple organs and cell types from E6AP null mice and in lymphoid cells is associated with increased number and intensity of PML-NBs. This PML elevation is enhanced in response to DNA damage. Our results identify E6AP as an important regulator of PML and PML-NBs.

Full Text

Cited Authors

  • Louria-Hayon, I; Alsheich-Bartok, O; Levav-Cohen, Y; Silberman, I; Berger, M; Grossman, T; Matentzoglu, K; Jiang, Y-H; Muller, S; Scheffner, M; Haupt, S; Haupt, Y

Published Date

  • August 2009

Published In

Volume / Issue

  • 16 / 8

Start / End Page

  • 1156 - 1166

PubMed ID

  • 19325566

Pubmed Central ID

  • 19325566

Electronic International Standard Serial Number (EISSN)

  • 1476-5403

International Standard Serial Number (ISSN)

  • 1350-9047

Digital Object Identifier (DOI)

  • 10.1038/cdd.2009.31


  • eng