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Flexibilidad de la cápside durante el ensamblaje de partículas de tipo viral Ty1

Bryan S Sibert1,2,3, J Adam Hannon-Hatfield4, Giuseppe Nicastro5

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El retrotransposón Ty1 forma partículas de tipo viral (VLP) con diversas estructuras, no formas icosaédricas verdaderas. Esta heterogeneidad surge del ensamblaje flexible de la proteína Gag, lo que revela nuevas perspectivas sobre la organización de los retrotransposones LTR.

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Área de la Ciencia:

  • Biología estructural
  • Biología molecular
  • Virología

Sus antecedentes:

  • La familia Ty1/Copia (Pseudoviridae) comprende retrotransposones LTR que se encuentran en eucariotas, y comparten ascendencia con los retrovirus.
  • Los retrotransposones Ty1 se ensamblan en partículas de tipo viral (VLP) compuestas principalmente por proteínas Gag y Gag-Pol.

Objetivo del estudio:

  • Determinar la organización estructural y las interacciones de la proteína Gag dentro de las VLP de Ty1.
  • Elucidar los mecanismos que subyacen a la morfología heterogénea de las VLP de Ty1.

Principales métodos:

  • Criomicroscopía electrónica de tomografía (cryo-ET) de VLP de Ty1 purificadas.
  • Promediado de subtomogramas (STA) para generar mapas de densidad de EM de alta resolución.
  • Cristalografía de rayos X y RMN en solución para modelar dominios de proteínas (CA-CTD y CA-NTD).

Principales resultados:

  • Se identificaron estructuras únicas de capsómeros pentagonales y hexagonales dentro de las VLP de Ty1.
  • Se demostró que las VLP de Ty1 exhiben diversos arreglos de capsómeros, a diferencia de los viriones icosaédricos.
  • Se modeló el dominio C-terminal (CA-CTD) y el dominio N-terminal (CA-NTD) de la cápside de Gag de Ty1, revelando flexibilidad en la Interfaz-2 crucial para el ensamblaje.
  • Se relacionó la flexibilidad del capsómero con el tamaño y la morfología heterogénea de las VLP.

Conclusiones:

  • Las VLP de Ty1 poseen una estructura heterogénea no icosaédrica debido al ensamblaje flexible de la proteína Gag.
  • La plasticidad estructural de las proteínas Gag de Ty1 permite diversos arreglos de capsómeros, lo que explica la heterogeneidad de las VLP.
  • Los hallazgos proporcionan una comprensión más profunda del ensamblaje y la evolución de los retrotransposones LTR.