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¿Qué controla la termodinámica de hibridación de los ácidos nucleicos esféricos?

Pratik S Randeria¹, Matthew R Jones¹, Kevin L Kohlstedt¹

¹†Department of Biomedical Engineering, ‡Department of Materials Science and Engineering, §Department of Chemistry and ∥Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society

|March 5, 2015

Resumen

La hibridación del ADN a los conjugados de ácido nucleico esférico (SNA) muestra una cooperatividad negativa, lo que significa que cada evento de unión dificulta el siguiente. Este descubrimiento permite diseñar SNA para una captura de cadenas de ADN altamente eficiente.

Área de la Ciencia:

Nanotecnología La nanotecnología es la nanotecnología.
La bioquímica es la bioquímica.
Biología Molecular Biología Molecular

Sus antecedentes:

Los conjugados de nanopartículas de ácido nucleico esférico (SNA) y oro ofrecen plataformas únicas para las interacciones del ADN.
Comprender la dinámica de hibridación del ADN en estas superficies es crucial para las aplicaciones.

Objetivo del estudio:

Para investigar los principios termodinámicos que rigen la hibridación de oligonucleótidos de ADN a los conjugados de nanopartículas de oro y SNA.
Para cuantificar el impacto de las hebras pre-hibridadas en sucesos de unión posteriores.

Principales métodos:

Utilizó la cuantificación termodinámica para analizar las constantes de unión al ADN.
Estudió los efectos de la fracción de hebra pre-hibridada en la afinidad de hibridación.

Principales resultados:

Se observó una cooperatividad negativa en la hibridación del ADN a los conjugados de SNA, donde la afinidad de unión disminuye significativamente con el aumento de la pre-hibridación.
Identificó tanto la repulsión electrostática como los efectos alostéricos que influyen en la hibridación.
Demostró una disminución de 3 órdenes en la constante de unión a medida que la fracción pre-hibridada aumentó de 0 a 30%.

Conclusiones:

La hibridación de ADN a SNA es un proceso complejo influenciado por la acumulación de carga y los cambios conformacionales.
Los conocimientos obtenidos permiten el diseño racional de conjugados SNA con eficiencias de unión al ADN mejoradas, acercándose al 100%.

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