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Las reorganizaciones conformacionales de nucleótidos individuales durante la unión de ARN-ligando son diferenciadas

Marina Frener¹, Ronald Micura¹

¹Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck , 6020 Innsbruck, Austria.

Journal of the American Chemical Society

|March 15, 2016

Resumen

Este estudio revela diferencias significativas en cómo las nucleobases en un ARN específico (aptamer de riboswitch preQ1) cambian de forma cuando se unen a los ligandos. Estos cambios conformacionales ocurren a diferentes velocidades, impactando la regulación de los genes.

Área de la Ciencia:

Biología molecular
La bioquímica
Biología del ARN

Sus antecedentes:

Los riboswitches son elementos reguladores de ARN que controlan la expresión génica.
El aptamer de riboswitch de clase I preQ1 de Thermoanaerobacter tengcongensis es un sistema modelo para estudiar el reconocimiento de ligandos.
Comprender la dinámica conformacional del ARN es crucial para descifrar los mecanismos de regulación genética.

Objetivo del estudio:

Investigar la tasa de diferenciación de los reordenamientos conformacionales de las nucleobases durante el reconocimiento de ligandos en el aptamer de riboswitch preQ1.
Para aclarar el papel de estas dinámicas en el mecanismo de ajuste inducido de la unión de ARN-ligando.
Para correlacionar las adaptaciones estructurales con los efectos posteriores en la expresión génica.

Principales métodos:

Utilizó el enfoque 2ApFold para medir las tasas de reordenamiento conformacional.
Se utilizó espectroscopia de fluorescencia en variantes de riboswitch con sustituciones de 2-aminopurina (2Ap) específicas del sitio.
Analizó las diferencias cinéticas en la adaptación de la nucleobasa a la unión del ligando.

Principales resultados:

Se observó una tasa de discriminación de 22 veces entre las adaptaciones conformacionales de las bases nucleares individuales.
Identificó el reordenamiento más rápido en el sitio de unión del ligando y el más lento en un nucleósido de apilamiento distal.
Demostró una amplia escala de tiempo para la adaptación de elementos estructurales locales en respuesta a la unión de ligandos.

Conclusiones:

El aptamer de riboswitch preQ1 emplea un mecanismo de ajuste inducido que involucra nucleobases con velocidades de reordenamiento distintas.
Estas diferencias de velocidad contribuyen a la generación de una señal estructural para la regulación génica.
Los hallazgos ofrecen información sobre la naturaleza dinámica de las interacciones ARN-ligando y sus consecuencias funcionales.

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