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Los motores moleculares impulsados por la luz aumentan el transporte selectivo de iones metálicos alcalinos a través
Wen-Zhi Wang1, Li-Bo Huang2, Shao-Ping Zheng2
1SAMS Research Group, Institut Charles Sadron UPR22, Centre National de la Recherce Scientifique, Université de Strasbourg, 67000 Strasbourg, France.
Journal of the American Chemical Society
|September 14, 2021
Resumen
Los investigadores desarrollaron motores rotativos impulsados por luz con canales de éter de corona para crear canales de iones artificiales. La activación de la luz aumentó significativamente el transporte de iones alcalinos a través de las membranas hasta en un 400%.
Área de la Ciencia:
- Química supramolecular
- Biofísica de las membranas
- Nanotecnología
Sus antecedentes:
- Los canales artificiales son cruciales para comprender y manipular el transporte de la membrana.
- Las máquinas moleculares impulsadas por la luz ofrecen un control externo preciso sobre los procesos a nanoescala.
- Los macrociclos como el 18-crown-6 son conocidos por su unión selectiva de iones.
Objetivo del estudio:
- Diseñar una estructura molecular sensible a la luz para el transporte selectivo de iones.
- Investigar el mecanismo de aceleración inducida por la luz de la translocación iónica a través de las bicapas lipídicas.
- Para demostrar la creación de canales de iones artificiales funcionales utilizando motores moleculares.
Principales métodos:
- Funcionalización de un motor rotativo hidrofóbico impulsado por la luz con dos macrociclos de 18 coronas 6.
- Incorporación de la estructura molecular en las bicapas de fosfolípidos.
- Se utilizaron ensayos de fluorescencia y electrofisiología de la pinza para controlar el transporte de iones.
Principales resultados:
- Demostró la formación de canales selectivos de iones alcalinos dentro de la bicapa fosfolípida.
- Se observó un aumento significativo en la actividad de transporte de iones (hasta un 400%) tras la irradiación de luz.
- Atribuyó el transporte acelerado a la dinámica fuera de equilibrio de los motores rotativos.
Conclusiones:
- Los motores rotativos impulsados por luz pueden accionar canales de iones artificiales, lo que permite el transporte controlado de la membrana.
- La activación del motor molecular supera las barreras de energía de activación para la translocación de iones.
- Este trabajo presenta un nuevo enfoque para la ingeniería de canales iónicos controlados por luz.
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