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PUMA Couples the Nuclear and Cytoplasmic Proapoptotic Function of p53
Jerry E. Chipuk,1*Lisa Bouchier-Hayes,1Tomomi Kuwana,1,2Donald D. Newmeyer,1Douglas R. Green1*
The Trp53 tumor suppressor gene product (p53) functions in thenucleus to regulate proapoptotic genes, whereas cytoplasmicp53 directly activates proapoptotic Bcl-2 proteins to permeabilizemitochondria and initiate apoptosis. Here, we demonstrate thata tripartite nexus between Bcl-xL, cytoplasmic p53, and PUMAcoordinates these distinct p53 functions. After genotoxic stress,Bcl-xL sequestered cytoplasmic p53. Nuclear p53 caused expressionof PUMA, which then displaced p53 from Bcl-xL, allowing p53to induce mitochondrial permeabilization. Mutant Bcl-xL thatbound p53, but not PUMA, rendered cells resistant to p53-inducedapoptosis irrespective of PUMA expression. Thus, PUMA couplesthe nuclear and cytoplasmic proapoptotic functions of p53.
1 Division of Cellular Immunology, La Jolla Institute for Allergy and Immunology, 10355 Science Center Drive, San Diego, CA 92121, USA. 2 University of Iowa, Carver College of Medicine, Department of Pathology, Iowa City, IA 52242, USA.
* Present address: Department of Immunology, St. Jude Children'sResearch Hospital, 332 North Lauderdale Street, Memphis, TN38105, USA.
To whom correspondence should be addressed. E-mail: dgreen5240{at}aol.com
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