VDAC2 enables BAX to mediate apoptosis and limit tumor development.

Nature communications (2018-11-28)
Hui San Chin, Mark X Li, Iris K L Tan, Robert L Ninnis, Boris Reljic, Kristen Scicluna, Laura F Dagley, Jarrod J Sandow, Gemma L Kelly, Andre L Samson, Stephane Chappaz, Seong L Khaw, Catherine Chang, Andrew Morokoff, Kerstin Brinkmann, Andrew Webb, Colin Hockings, Cathrine M Hall, Andrew J Kueh, Michael T Ryan, Ruth M Kluck, Philippe Bouillet, Marco J Herold, Daniel H D Gray, David C S Huang, Mark F van Delft, Grant Dewson

Intrinsic apoptosis is critical to prevent tumor formation and is engaged by many anti-cancer agents to eliminate tumor cells. BAX and BAK, the two essential mediators of apoptosis, are thought to be regulated through similar mechanisms and act redundantly to drive apoptotic cell death. From an unbiased genome-wide CRISPR/Cas9 screen, we identified VDAC2 (voltage-dependent anion channel 2) as important for BAX, but not BAK, to function. Genetic deletion of VDAC2 abrogated the association of BAX and BAK with mitochondrial complexes containing VDAC1, VDAC2, and VDAC3, but only inhibited BAX apoptotic function. Deleting VDAC2 phenocopied the loss of BAX in impairing both the killing of tumor cells by anti-cancer agents and the ability to suppress tumor formation. Together, our studies show that efficient BAX-mediated apoptosis depends on VDAC2, and reveal a striking difference in how BAX and BAK are functionally impacted by their interactions with VDAC2.

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Monoclonal ANTI-FLAG® M2 antibody produced in mouse, clone M2, purified immunoglobulin (Purified IgG1 subclass), buffered aqueous solution (10 mM sodium phosphate, 150 mM NaCl, pH 7.4, containing 0.02% sodium azide)
Anti-VDAC1 Antibody, clone N152B/23, clone N152B/23, from mouse
Anti-TIMM44 antibody produced in rabbit, Prestige Antibodies® Powered by Atlas Antibodies, affinity isolated antibody, buffered aqueous glycerol solution
Anti-Bak antibody produced in rabbit, IgG fraction of antiserum, buffered aqueous solution