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La proteína M2 del virus de la gripe media la escisión de la membrana independiente del ESCRT
Jeremy S Rossman1, Xianghong Jing, George P Leser
1Department of Biochemistry, Northwestern University, Evanston, IL 60208, USA.
Cell
|September 21, 2010
Resumen
El brote del virus de la gripe utiliza la proteína del canal iónico M2, no las proteínas ESCRT del huésped. La proteína M2 es la proteína M2.
Área de la Ciencia:
- Virología Virología.
- Biología celular Biología celular.
- Biología de la Membrana Biología de la Membrana.
Sus antecedentes:
- Muchos virus dependen de las proteínas ESCRT del huésped para una germinación y liberación eficientes.
- El brote del virus de la gripe se ha considerado un proceso independiente del ESCRT.
Objetivo del estudio:
- Para investigar el papel de la proteína del canal iónico protón-selectivo M2 del virus de la gripe en el brote viral.
- Aclarar el mecanismo por el cual el virus de la influenza logra la escisión de la membrana y la liberación de viriones.
Principales métodos:
- Análisis de la función de la proteína M2 en la alteración de la curvatura de la membrana utilizando vesículas unilamellares gigantes.
- Mutagénesis dirigida al sitio de la hélice anfipática de cola citoplasmática M2.
- Transfección in vivo y observación del brote de la proteína M2 y la liberación de viriones.
Principales resultados:
- Una hélice anfipática conservada en la cola citoplasmática M2 media los cambios de curvatura de la membrana dependientes del colesterol.
- Esta hélice M2 es suficiente para el brote en membranas modelo y esencial para el brote in vivo.
- M2 se localiza en el sitio de brotación, y las mutaciones en la hélice evitan la escisión de la membrana y la liberación del virus.
Conclusiones:
- La proteína M2 del virus de la influenza juega un papel crítico en la mediación de las etapas finales del brote viral.
- M2 facilita la escisión de la membrana y la liberación de viriones, eludiendo el requisito de la maquinaria ESCRT anfitriona.
- Este descubrimiento ofrece una nueva comprensión de las estrategias de replicación del virus de la influenza.
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