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Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
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Dependencia de la actividad de la replicasa del poliovirus en la proteína de la célula huésped
Cell
|February 1, 1980
Resumen
Los investigadores identificaron dos actividades de la ARN polimerasa del poliovirus. Se purificó un factor huésped, que potencialmente actúa en la iniciación, y se reconstituyó la actividad de la replicasa, lo que sugiere su papel crucial en la replicación del ARN del poliovirus.
Área de la Ciencia:
- Virología Virología.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La replicación del ARN del poliovirus depende de las actividades específicas de la ARN polimerasa viral.
- Comprender los mecanismos y factores precisos involucrados en la síntesis de ARN del poliovirus es crucial para las estrategias antivirales.
Objetivo del estudio:
- Identificar y caracterizar las distintas actividades de la ARN polimerasa involucradas en la replicación del ARN del poliovirus.
- Investigar el papel de los factores del huésped en el apoyo a la síntesis de ARN del poliovirus.
Principales métodos:
- Purificación de las actividades de la ARN polimerasa específicas del poliovirus utilizando la cromatografía poli (U) -agarosa.
- Ensayos de reconstitución que incluyen fracciones de polimerasa purificadas y eluados de lavado de sales ribosómicas.
- Identificación y purificación de un factor huésped esencial para la actividad de la replicasa.
Principales resultados:
- Dos actividades distintas, la poli (U) polimerasa y la replicasa, fueron inicialmente co-purificadas.
- La actividad de la replicasa se perdió con la elución del gradiente de sal, pero se pudo reconstituir mediante la adición de una fracción de lavado de sal ribosómica.
- Se identificó un factor huésped purificado 50 veces a partir del lavado de sal ribosómica, que podría ser sustituido por oligo (U), lo que indica un papel en la iniciación.
- El complejo de replicasa-hospedador reconstituido copió preferentemente ARN que contenían poli (A), con preferencia por el ARN del poliovirus.
Conclusiones:
- La replicación del ARN del poliovirus implica al menos dos actividades distintas de la polimerasa.
- Un factor de huésped específico, probablemente involucrado en el paso de iniciación, es esencial para la actividad de la replicasa de ARN del poliovirus.
- El sistema purificado de factores de replicasa-anfitrión purificado demuestra el reconocimiento y la replicación específicos de las plantillas de ARN del poliovirus.
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