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La estructura tridimensional del nucleocápsido del HSV1
J D Schrag1, B V Prasad, F J Rixon
1University of Arizona, Department of Biochemistry, Tucson 85721.
Cell
|February 24, 1989
Resumen
El análisis por computadora reveló las estructuras tridimensionales de las cápsidas llenas y vacías del Herpes Simplex Virus 1 (HSV1). La cápside completa tiene tres capas, con ADN genómico dentro de un caparazón T = 4 y canales que conectan el ADN con el exterior.
Área de la Ciencia:
- Biología estructural Biología estructural.
- Virología Virología.
- La microscopía criolectrónica es una técnica de microscopía criolectrónica.
Sus antecedentes:
- El virus herpes simplex 1 (HSV1) es un patógeno humano significativo.
- Comprender la estructura de la cápside del HSV1 es crucial para el desarrollo de fármacos antivirales.
Objetivo del estudio:
- Para determinar las estructuras tridimensionales de las cápsidas llenas y vacías de HSV1.
- Para aclarar la organización de las capas de cápside del HSV1 y el empaque del ADN.
Principales métodos:
- Imágenes cryoelectrónicas de baja dosis de cápsulas de HSV1 incrustadas en el hielo.
- Análisis por computadora de los datos de microscopía electrónica.
- Análisis de la simetría icosaédrica (T=16 y T=4).
Principales resultados:
- La cápside HSV1 completa comprende capas externas, intermedias e internas; la cápside vacía tiene una sola capa externa.
- La capa exterior exhibe simetría icosaédrica T=16, mientras que la capa intermedia se encuentra en una red T=4.
- El ADN genómico se encuentra dentro de la cáscara T = 4, formando la capa más interna, con canales que conectan el ADN con el exterior.
Conclusiones:
- La estructura de la cápside del HSV1 está altamente organizada con capas distintas y simetría.
- Existe una vía directa entre el ADN encapsulado y el entorno externo, potencialmente relevante para el transporte de ADN viral.
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