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Mímicos de proteínas de desacoplamiento de moléculas pequeñas: receptores aniónicos sintéticos como transportadores
1Chemistry, University of Southampton , Southampton SO17 1BJ, U.K.
Journal of the American Chemical Society
|December 22, 2016
Resumen
Los transportadores de aniones sintéticos pueden imitar las proteínas de desacoplamiento (UCP) mediante el uso de ácidos grasos para transportar protones a través de membranas. Este descubrimiento ofrece nuevos conocimientos sobre el transporte biológico de protones y las aplicaciones de transportadores sintéticos.
Área de la Ciencia:
- La bioquímica
- Biofísica de las membranas
- Química sintética
Sus antecedentes:
- Las proteínas de desacoplamiento (UCP) regulan el gasto de energía celular mediando la fuga de protones a través de la membrana interna mitocondrial.
- Los ácidos grasos son activadores esenciales para la actividad de transporte de protones de UCP1 y UCP2.
Objetivo del estudio:
- Investigar los receptores de aniones neutros sintéticos para el transporte de protones activado por ácidos grasos en las bicapas de fosfolípidos.
- Explorar el mecanismo de transporte de protones mejorado con ácidos grasos por transportadores de aniones sintéticos.
Principales métodos:
- Utilizó una tiurea trípode y otros transportadores de aniones sintéticos (basados en enlaces de hidrógeno y halógeno).
- Actividad de transporte de protones (H+) evaluada en bicapas de fosfolípidos con y sin ácidos grasos de cadena larga.
- Recopilación de pruebas para apoyar un mecanismo de ciclo de ácidos grasos propuesto.
Principales resultados:
- Una tiurea trípode mostró un transporte mínimo de protones sin ácidos grasos, pero una actividad significativa cuando fue activada por ellos.
- Se observó el transporte de protones mejorado con ácidos grasos para múltiples transportadores de aniones sintéticos.
- La evidencia apoya un mecanismo donde los transportadores facilitan el flip-flop de ácidos grasos, lo que permite el transporte de protones.
Conclusiones:
- Los receptores de aniones neutros sintéticos pueden replicar la función de transporte de protones activada por ácidos grasos de las UCP.
- Los hallazgos sugieren un mecanismo de ciclo de ácidos grasos para el transporte de protones mediado por estos transportadores sintéticos.
- Esta investigación abre caminos para la química de los receptores aniónicos y la comprensión del transporte biológico y sintético de protones.
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