Abstract
Bax translocation from the cytosol to mitochondria culminates a key step by which this protein mediates cell death. Here, we identified two amino acids, L70 and D71, within the BH3 domain of Bax that play a critical role in regulating Bax's cytosolic vs mitochondrial distribution. Individual substitution of these amino acids with alanine resulted in Bax conformational change, oligomerization, localization to mitochondria and cell death. Further mutational analysis indicated that L70 interacts with T174, V177 and A178 of Bax's C-terminal hydrophobic segment, while the negative charge of D71 is required for maintaining Bax in its soluble monomeric state. In summary, we have identified a new regulatory site that controls Bax's subcellular distribution and activation.
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Acknowledgements
We thank Dr Debbie Hansen for critical reading and Yunfei Chai for technical assistance. This research was supported by the grants RO1 NS40932 and COG RR01 5455 (MUSC animal facility) from the NIH.
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Supplementary information accompanies the paper on the Oncogene web site (http://www.nature.com/onc).
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Zhou, H., Hou, Q., Hansen, J. et al. Complete activation of Bax by a single site mutation. Oncogene 26, 7092–7102 (2007). https://doi.org/10.1038/sj.onc.1210517
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DOI: https://doi.org/10.1038/sj.onc.1210517
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