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Prediction of HIV-1 Coreceptor Usage Tropism by Sequence Analysis using a Genotypic Approach
Published on: December 1, 2011
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Bases estructurales del reconocimiento de los coreceptores por el pico de la envoltura del VIH-1
Md Munan Shaik1,2, Hanqin Peng1, Jianming Lu3,4
1Division of Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
Nature
|December 14, 2018
Resumen
La estructura de la glicoproteína (Env) de la envoltura del VIH-1 revela cómo la unión al coreceptor CCR5 desestabiliza la gp41, iniciando la fusión viral. Este hallazgo aclara los mecanismos de entrada del VIH y ayuda al desarrollo terapéutico.
Área de la Ciencia:
- Biología estructural
- Virología
- Inmunología
Sus antecedentes:
- La entrada del VIH-1 se basa en la interacción de la glicoproteína de la envoltura (Env) con CD4 y los coreceptores como CCR5.
- La unión al gp120-coreceptor es crítica para desencadenar la fusión viral a través del gp41.
- Comprender esta interacción es clave para el desarrollo de terapias y vacunas contra el VIH.
Objetivo del estudio:
- Para determinar la estructura de alta resolución del VIH-1 gp120 en complejo con CD4 y CCR5.
- Para aclarar el mecanismo molecular por el cual la unión a CCR5 inicia la fusión viral.
Principales métodos:
- Se utilizó la crio-microscopía electrónica (crio-EM) para obtener una estructura de resolución de 3,9 Å.
- El estudio analizó la interacción entre gp120 de longitud completa, CD4 soluble y CCR5 humano no modificado.
Principales resultados:
- El bucle V3 de gp120 se inserta en el bolsillo de unión de quimiocinas CCR5.
- La unión a CCR5 no causa cambios alostéricos en gp120 pero acerca a Env a la membrana objetivo.
- El extremo N de gp120 se vuelca, desestabilizando potencialmente gp41 e iniciando la fusión.
Conclusiones:
- CCR5 actúa como un ancla estabilizador para la conformación Env unida a CD4 cerca de la membrana celular.
- Los hallazgos proporcionan información crucial sobre la vía de entrada del VIH-1.
- Esta comprensión estructural puede influir en el diseño de nuevas vacunas y terapias contra el VIH.
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