Intracellular anions as the voltage sensor of prestin, the outer hair cell motor protein

D. Oliver, D. Z.Z. He, N. Klöcker, J. Ludwig, U. Schulte, S. Waldegger, J. P. Ruppersberg, P. Dallos, B. Fakler

Research output: Contribution to journalArticlepeer-review

362 Scopus citations


Outer hair cells (OHCs) of the mammalian cochlea actively change their cell length in response to changes in membrane potential. This electromotility, thought to be the basis of cochlear amplification, is mediated by a voltage-sensitive motor molecule recently identified as the membrane protein prestin. Here, we show that voltage sensitivity is conferred to prestin by the intracellular anions chloride and bicarbonate. Removal of these anions abolished fast voltage-dependent motility, as well as the characteristic nonlinear charge movement ("gating currents") driving the underlying structural rearrangements of the protein. The results support a model in which anions act as extrinsic voltage sensors, which bind to the prestin molecule and thus trigger the conformational changes required for motility of OHCs.

Original languageEnglish (US)
Pages (from-to)2340-2343
Number of pages4
Issue number5525
StatePublished - Jun 22 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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