期刊
FEBS LETTERS
卷 585, 期 14, 页码 2363-2366出版社
WILEY
DOI: 10.1016/j.febslet.2011.06.008
关键词
Voltage-dependent anion channel; Selectivity; PEG; Mitochondria; Microtubule; Planar lipid bilayer
资金
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH
Recently reported functional interaction between voltage-dependent anion channel of the outer mitochondrial membrane, VDAC, and dimeric tubulin is observed as a reversible channel blockage. Using partitioning of poly-(ethylene glycol)s of different molecular weights and reversal potential measurements, we probe the size and ion selectivity of the fully open and tubulin-blocked states of VDAC reconstituted into planar lipid bilayers. While the effective radius of the channel decreases by only a factor of 1.34 +/- 0.15, the selectivity reverses from initially anionic to cationic. Directly measuring ATP partitioning we demonstrate that these changes prohibit ATP from entering the channel in its tubulin-blocked state. Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
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