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La transcripción bidireccional SV40 mediada por las interacciones de unión Sp1 en tándem
Science (New York, N.Y.)
|November 1, 1985
Resumen
El promotor del SV40
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El promotor SV40 contiene 21 elementos de repetición de pares de bases con seis cajas GC.
- Cada caja GC se une al factor de transcripción celular Sp1 con una afinidad variable.
Objetivo del estudio:
- Investigar el papel de Sp1 que se une a cajas GC específicas en la actividad del promotor SV40.
- Para diferenciar los sitios de unión de Sp1 para la síntesis temprana y tardía de ARN.
Principales métodos:
- Pruebas de transcripción in vitro.
- Análisis de la unión de Sp1 a las cajas GC del promotor SV40.
Principales resultados:
- La interacción de Sp1 con las cajas GC I, II y III media la síntesis temprana de ARN SV40 in vitro.
- La unión de Sp1 a las cajas GC III, V y VI media la síntesis tardía de ARN SV40.
Conclusiones:
- Las cajas GC específicas dentro del promotor SV40 son utilizadas diferencialmente por Sp1 para la transcripción temprana y tardía.
- Este mecanismo de unión diferencial regula la direccionalidad de la síntesis de ARN SV40.
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