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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
Published on: March 30, 2015
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Los heteropolímeros de cadena única transportan protones de manera selectiva y rápida
Tao Jiang1,2, Aaron Hall1, Marco Eres1,3
1Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA, USA.
Nature
|January 10, 2020
Resumen
Los heteropolímeros aleatorios (RHP) imitan los canales de protones naturales sin estructuración atómica. Estos polímeros facilitan el transporte selectivo de protones a través de las bicapas de lípidos, logrando un rendimiento comparable al de los sistemas naturales.
Área de la Ciencia:
- Química biomimética
- Ciencias de los polímeros
- Biofísica de las membranas
Sus antecedentes:
- Los canales naturales logran una estructura precisa y una diversidad química para el transporte de protones.
- Los canales sintéticos que utilizan péptidos, ADN y polímeros no han igualado el rendimiento natural.
Objetivo del estudio:
- Investigar los heteropolímeros aleatorios (RHP) como un nuevo enfoque para el transporte selectivo de protones.
- Para demostrar que los RHP pueden imitar las proteínas de la membrana y lograr velocidades de transporte de protones similares a las naturales.
Principales métodos:
- Fabricación de heteropolímeros aleatorios basados en cuatro monómeros.
- Inserción de RHP en las bicapas lipídicas para formar vías funcionales de transporte de protones.
- Análisis de las relaciones estructura-función RHP para el transporte de protones.
Principales resultados:
- Los RHP permitieron el transporte selectivo de protones a través de las bicapas lipídicas a tasas comparables a los canales de protones naturales.
- La heterogeneidad de la hidrofobidad segmentaria en los RHP facilitó la inserción de dos capas.
- Los segmentos polares que abarcan Bilayer en RHP formaron cadenas de enlaces de hidrógeno para el transporte de protones.
Conclusiones:
- El control estadístico de la distribución del monómero RHP es clave para lograr una función similar a la de las proteínas.
- La adaptabilidad y la modularidad en los HPR permiten un comportamiento uniforme en sistemas heterogéneos.
- La aleatoriedad estadística ofrece una nueva estrategia para el diseño de sistemas biomiméticos de cadena de polímero único.
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