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Proc Natl Acad Sci U S A. 2011 Mar 8;108(10):4105-10. doi: 10.1073/pnas.1015181108. Epub 2011 Feb 22.

Benzoquinone ansamycin 17AAG binds to mitochondrial voltage-dependent anion channel and inhibits cell invasion.

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Laboratory of Molecular Oncology, Van Andel Research Institute, Grand Rapids, MI 49503, USA.

Erratum in

  • Proc Natl Acad Sci U S A. 2011 Mar 29;108(13):5472. Daughtery-Holtrop, Jennifer [corrected to Daugherty-Holtrop, Jennifer].


Geldanamycin and its derivative 17AAG [17-(Allylamino)-17-demethoxygeldanamycin, telatinib] bind selectively to the Hsp90 chaperone protein and inhibit its function. We discovered that these drugs associate with mitochondria, specifically to the mitochondrial membrane voltage-dependent anion channel (VDAC) via a hydrophobic interaction that is independent of HSP90. In vitro, 17AAG functions as a Ca(2+) mitochondrial regulator similar to benzoquinone-ubiquinones like Ub0. All of these compounds increase intracellular Ca(2+) and diminish the plasma membrane cationic current, inhibiting urokinase activity and cell invasion. In contrast, the HSP90 inhibitor radicicol, lacking a bezoquinone moiety, has no measurable effect on cationic current and is less effective in influencing intercellular Ca(2+) concentration. We conclude that some of the effects of 17-AAG and other ansamycins are due to their effects on VDAC and that this may play a role in their clinical activity.

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