Title |
Bax transmembrane domain interacts with prosurvival Bcl-2 proteins in biological membranes
|
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Published in |
Proceedings of the National Academy of Sciences of the United States of America, December 2016
|
DOI | 10.1073/pnas.1612322114 |
Pubmed ID | |
Authors |
Vicente Andreu-Fernández, Mónica Sancho, Ainhoa Genovés, Estefanía Lucendo, Franziska Todt, Joachim Lauterwasser, Kathrin Funk, Günther Jahreis, Enrique Pérez-Payá, Ismael Mingarro, Frank Edlich, Mar Orzáez |
Abstract |
The Bcl-2 (B-cell lymphoma 2) protein Bax (Bcl-2 associated X, apoptosis regulator) can commit cells to apoptosis via outer mitochondrial membrane permeabilization. Bax activity is controlled in healthy cells by prosurvival Bcl-2 proteins. C-terminal Bax transmembrane domain interactions were implicated recently in Bax pore formation. Here, we show that the isolated transmembrane domains of Bax, Bcl-xL (B-cell lymphoma-extra large), and Bcl-2 can mediate interactions between Bax and prosurvival proteins inside the membrane in the absence of apoptotic stimuli. Bcl-2 protein transmembrane domains specifically homooligomerize and heterooligomerize in bacterial and mitochondrial membranes. Their interactions participate in the regulation of Bcl-2 proteins, thus modulating apoptotic activity. Our results suggest that interactions between the transmembrane domains of Bax and antiapoptotic Bcl-2 proteins represent a previously unappreciated level of apoptosis regulation. |
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