Report

Intracellular Anions as the Voltage Sensor of Prestin, the Outer Hair Cell Motor Protein

Science  22 Jun 2001:
Vol. 292, Issue 5525, pp. 2340-2343
DOI: 10.1126/science.1060939

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

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.

  • * To whom correspondence should be addressed. E-mail: bernd.fakler{at}uni-tuebingen.de

View Full Text

Cited By...