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Am J Physiol Cell Physiol 260: C371-C374, 1991;
0363-6143/91 $5.00
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AJP - Cell Physiology, Vol 260, Issue 2 C371-C374, Copyright © 1991 by American Physiological Society

ARTICLES

Voltage gating of the mitochondrial outer membrane channel VDAC is regulated by a very conserved protein

M. Y. Liu and M. Colombini
Department of Zoology, University of Maryland, College Park 20742.

Soluble protein preparations obtained from the mitochondrial fractions of three very different organisms, Neurospora crassa, rat, and potato, were discovered to greatly enhance the voltage sensitivity of the mitochondrial outer membrane channel, VDAC. The active ingredient, referred to as the VDAC modulator, increased the rate of voltage-dependent channel closure by approximately 10-fold. The modulator from one species increased the closing rate of VDAC channels from all three species. The activity is pronase sensitive and not mimicked by another negatively charged protein, BSA. The highly conserved property of this modulator suggests an important physiological role in regulating mitochondrial function.


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