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Papers In Press, published online ahead of print March 20, 2001
Cancer Biology, University of Pennsylvania, Philadelphia, PA 19104
Corresponding Author: drt{at}mail.med.upenn.edu
The diffusion of metabolites across the outer mitochondrial membrane is essential for coupled cellular respiration. The outer membrane of mitochondria isolated from growth factor-deprived cells is impaired in its ability to exchange metabolic anions. When added to mitochondria, recombinant Bcl-xL restores metabolite exchange across the outer membrane, without inducing the loss of cytochrome c from the intermembrane space. Restoration of outer membrane permeability to anionic metabolites does not occur directly through Bcl-xL ion channels. Instead, recombinant Bcl-xL maintains the outer mitochondrial membrane channel, VDAC, in an open configuration. Consistent with these findings, when ADP-induced oxidative phosphorylation is limited by exogenous bNADH, recombinant Bcl-xL can sustain outer mitochondrial membrane permeability to ADP. b-NADH limits respiration by promoting the closed configuration of VDAC. Together these results demonstrate that following an apoptotic signal, Bcl-xL can maintain metabolite exchange across the outer mitochondrial membrane by inhibiting VDAC closure.
J. Biol. Chem, 10.1074/jbc.M101590200
Submitted on February 20, 2001
Revised on March 15, 2001
Accepted on March 20, 2001
Bcl-xL promotes the open configuration of VDAC and metabolite passage through the outer mitochondrial membrane
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