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Las estructuras TRPV1 en distintas conformaciones revelan mecanismos de activación

Erhu Cao¹, Maofu Liao, Yifan Cheng

¹1] Department of Physiology, University of California, San Francisco, California 94158-2517, USA [2].

|December 6, 2013

Resumen

Los investigadores utilizaron sondas de drogas para revelar las estructuras activadas del receptor de capsaicina (TRPV1). Este canal iónico utiliza un mecanismo de doble puerta que involucra puertas superiores e inferiores para la transducción de señales.

Área de la Ciencia:

Biofísica de los canales iónicos.
Fisiología molecular y celular.

Sus antecedentes:

Los canales de potencial receptor transitorio (TRP) son detectores de señales cruciales involucrados en la excitabilidad celular.
Comprender sus mecanismos de activación es clave para comprender los estados normales y de enfermedad.

Objetivo del estudio:

Determinar las estructuras de dos estados activados del receptor de capsaicina (TRPV1).
Para dilucidar los mecanismos de control de TRPV1 y compararlos con los canales controlados por voltaje.

Principales métodos:

Utilizó sondas farmacológicas, incluyendo una toxina peptídica y agonistas vanilloides.
Determinadas estructuras de alta resolución de los estados activados de TRPV1.

Principales resultados:

Se identificaron reordenamientos estructurales distintos en el poro externo y una puerta inferior dilatada durante la activación de TRPV1.
Se observó que un dominio (segmentos de transmembrana 1-4) permanece estacionario, a diferencia de los canales de tensión.
Propuso un mecanismo de doble puerta para el TRPV1.1.

Conclusiones:

La activación de TRPV1 implica reorganizaciones significativas de los poros externos y un mecanismo de doble puerta.
El acoplamiento alostérico entre las puertas superior e inferior probablemente subyace a la compleja modulación fisiológica de TRPV1.
El gating TRPV1 difiere de los canales regulados por voltaje, lo que indica mecanismos únicos dentro de las superfamilias de canales TRP.

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