The PP2A-Associated Protein α4 Is an Essential Inhibitor of Apoptosis
- 22 October 2004
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 306 (5696) , 695-698
- https://doi.org/10.1126/science.1100537
Abstract
Despite evidence that protein kinases are regulators of apoptosis, a specific role for phosphatases in regulating cell survival has not been established. Here we show that α4, a noncatalytic subunit of protein phosphatase 2A (PP2A), is required to repress apoptosis in murine cells. α4 is a nonredundant regulator of the dephosphorylation of the transcription factors c-Jun and p53. As a result of α 4 deletion, multiple proapoptotic genes were transcribed. Either inhibition of new protein synthesis or Bcl-x L overexpression suppressed apoptosis initiated by α 4 deletion. Thus, mammalian cell viability depends on repression of transcription-initiated apoptosis mediated by a component of PP2A.Keywords
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