Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 21, Issue 6, Pages 535-543Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.2829
Keywords
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Funding
- US National Institutes of Health (NIH) [R01CA082491, 1R01GM083159]
- NIH [R01 GM52735, R01GM96208]
- US National Cancer Institute Cancer Center Support [P30CA21765]
- American Lebanese Syrian Associated Charities
- St. Jude Children's Research Hospital
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Under conditions of genotoxic stress, human p53 activates the apoptotic effectors BAX or BAK to result in mitochondrial outer-membrane permeabilization and apoptosis. Antiapoptotic BCL-2 family member BCL-xL opposes this activity by sequestering cytosolic p53 via association with its DNA-binding domain, an interaction enhanced by p53 tetramerization. Here we characterized the BCL-xL p53 complex by NMR spectroscopy and modulated it through mutagenesis to determine the relative contributions of BCL-xL's interactions with p53 or other BCL-2 family proteins to the BCL-xL dependent inhibition of UV irradiation induced apoptosis. Under our experimental conditions, one-third of the antiapoptotic activity of BCL-xL was mediated by p53 sequestration and the remaining two-thirds through sequestration of proapoptotic BCL-2 family members. Our studies define the contributions of cytosolic p53 to UV irradiation induced apoptosis and provide opportunities to explore its contributions to other p53-dependent apoptotic signaling pathways.
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