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Complejos oligonucleótidos y péptidos: control de fase por hibridación

Jeffrey R Vieregg1, Michael Lueckheide2, Amanda B Marciel1

  • 1Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637, United States.

Journal of the American Chemical Society
|January 10, 2018
PubMed
Resumen
Este resumen es generado por máquina.

El estado de hibridación de los ácidos nucleicos dicta si forman precipitados sólidos o coacervados líquidos cuando se complejan con péptidos catiónicos. Este hallazgo ofrece potencial para el desarrollo de nanopartículas sensibles para aplicaciones terapéuticas y de detección.

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Área de la Ciencia:

  • Ciencias de los Polímeros
  • Biofísica y Química
  • Biología molecular

Sus antecedentes:

  • La liberación de counterion impulsa la separación de fases en mezclas de polímeros de carga opuesta, un problema crítico sin resolver.
  • Los ácidos nucleicos, polianiones altamente cargados, se condensan a través de proteínas básicas en las células (cromatina) y forman orgánulos sin membrana.
  • Las interacciones electrostáticas son clave para ensamblar nanopartículas para la administración terapéutica de ácido nucleico.

Objetivo del estudio:

  • Investigar el comportamiento de fase de los complejos formados entre los oligonucleótidos y los péptidos catiónicos.
  • Comprender cómo la estructura del ácido nucleico y la densidad de carga influyen en la formación de complejos y la separación de fases.
  • Explorar el potencial de estos complejos para aplicaciones terapéuticas y de detección sensibles.

Principales métodos:

  • Experimentos de complejación con oligonucleótidos (ARN, huesos vertebrales de metilfosfonato) y péptidos catiónicos.
  • Variando las longitudes, concentraciones y estructuras del polímero.
  • Investigación del efecto de la concentración de sal en la fase compleja.

Principales resultados:

  • El estado de hibridación de los ácidos nucleicos controla la fase de los complejos: los de doble cadena forman precipitados sólidos, los de cadena única forman coacervados líquidos.
  • La densidad de carga más baja de los oligonucleótidos de una sola cadena contribuye a la formación de coacervados líquidos.
  • La adición de sal transforma los precipitados en coacervados, y los oligonucleótidos unidos al coacervado retienen la competencia de hibridación.

Conclusiones:

  • El estado de hibridación del ácido nucleico es un determinante crítico del comportamiento de la fase compleja.
  • Los complejos de oligonucleótidos pueden hacer la transición entre las fases sólida y líquida en respuesta a estímulos ambientales como la concentración de sal.
  • Estos hallazgos sugieren el potencial para crear complejos y nanopartículas respetuosos con el medio ambiente para aplicaciones avanzadas.