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Voltage gating in VDAC is markedly inhibited by micromolar quantities of aluminum

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Summary

The mitochondrial outer membrane contains voltagegated channels called VDAC that are responsible for the flux of metabolic substrates and metal ions across this membrane. The addition of micromolar quantities of aluminum chloride to phospholipid membranes containing VDAC channels greatly inhibits the voltage dependence of the channels' permeability. The channels remain in their high conducting (open) state even at high membrane potentials. An analysis of the change in the voltage-dependence parameters revealed that the steepness of the voltage dependence decreased while the voltage needed to close half the channels increased. The energy difference between the open and closed states in the absence of an applied potential did not change. Therefore, the results are consistent with aluminum neutralizing the voltage sensor of the channel. pH shift experiments showed that positively charged aluminum species in solution were not involved. The active form was identified as being either (or both) the aluminum hydroxide or the tetrahydroxoaluminate form. Both of these could reasonably be expected to neutralize a positively charged voltage sensor. Aluminum had no detectable effect of either single-channel conductance or selectivity, indicating that the sensor is probably not located in the channel proper and is distinct from the selectivity filter.

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Authors and Affiliations

  1. Laboratories of Cell Biology, Department of Zoology, University of Maryland, 20742, College Park, Maryland

    E. T. Dill, M. J. Holden & M. Colombini

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  1. E. T. Dill
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  2. M. J. Holden
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  3. M. Colombini
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Dill, E.T., Holden, M.J. & Colombini, M. Voltage gating in VDAC is markedly inhibited by micromolar quantities of aluminum. J. Membrain Biol. 99, 187–196 (1987). https://doi.org/10.1007/BF01995699

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