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Los aniones intracelulares como el sensor de voltaje de la prestina, la proteína motora externa de las células

D Oliver¹, D Z He, N Klöcker

¹Department of Physiology II, University of Tübingen, 72074 Tübingen, Germany.

Science (New York, N.Y.)

|June 26, 2001

Resumen

Los aniones intracelulares como el cloruro y el bicarbonato son esenciales para la sensibilidad al voltaje de la prestina, la proteína motora responsable de la electromotilidad de las células ciliadas externas (OHC) y la amplificación coclear. Su eliminación interrumpe la función de OHC.

Área de la Ciencia:

La neurociencia auditiva es una neurociencia auditiva.
Biología Molecular Biología Molecular
Fisiología celular Fisiología celular.

Sus antecedentes:

Las células ciliadas exteriores (OHC) en la cóclea de los mamíferos exhiben electromotilidad, un mecanismo clave para la amplificación coclear.
Esta motilidad es impulsada por la prestina, una proteína motora sensible a la tensión ubicada en la membrana OHC.

Objetivo del estudio:

Investigar el papel de los aniones intracelulares en la atribución de la sensibilidad a la tensión a la prestin.
Para dilucidar el mecanismo por el cual la prestina media la electromotilidad OHC.

Principales métodos:

Eliminación experimental de aniones intracelulares (cloruro y bicarbonato) de las OHCs.
Medición de la motilidad dependiente de la tensión y de las corrientes de contención en la preparación.

Principales resultados:

La eliminación de cloruro y bicarbonato abolió la motilidad dependiente de voltaje rápido en los OHC.
Se eliminó el característico movimiento de carga no lineal (corrientes de separación) asociado con la función de prestin.
Los aniones fueron identificados como cruciales para las capacidades de detección de voltaje de Prestin.

Conclusiones:

Los aniones intracelulares, específicamente el cloruro y el bicarbonato, actúan como sensores de voltaje extrínsecos para la prestamina.
La unión de aniones a la prestina desencadena los cambios conformacionales necesarios para la electromotilidad OHC.
Este hallazgo proporciona una visión mecanicista de la amplificación coclear a nivel molecular.

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