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Nuevas reacciones catalizadas por una ribozima intron del grupo II con sustratos de ARN y ADN
M Mörl1, I Niemer, C Schmelzer
1Institut für Genetik und Mikrobiologie, Universität München, Germany.
Cell
|September 4, 1992
Resumen
Los intrones del grupo II exhiben una notable versatilidad catalítica. Las nuevas reacciones sugieren que estos intrones podrían integrarse directamente en el ADN y que las réplicas de ARN pueden usar nucleótidos trifosfatados.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- Los intrones del grupo II autoesplicantes son ARN catalíticos involucrados en la expresión génica.
- El intrón bI1 del gen COB de las mitocondrias de la levadura es un ejemplo bien estudiado.
Objetivo del estudio:
- Explorar las nuevas actividades catalíticas del intrón bI1.1. del grupo II de autoadhesión.
- Para investigar las implicaciones evolutivas de estas reacciones.
Principales métodos:
- Reacciones estudiadas de una forma lineal del intrón bI1.
- Investigó la transesterificación utilizando energía de enlace de fosfoanhidruro.
- Se ha examinado la ligadura de ADN monocatenario a ARN.
- Se evaluó la escisión de sustratos de ADN de una sola cadena.
Principales resultados:
- Inversión demostrada del primer paso de auto-esplicado utilizando energía de enlace de fosfoanhidruro para la transesterificación.
- Se mostró la ligadura del ADN monocatenario al ARN.
- Se informó de la escisión de ADN de una sola hebra.
- Se identificó el uso potencial de los trifosfatos de mononucleótido por las réplicas de ARN.
- Se sugiere la integración directa de ADN de intrones extirpados sin transcripción inversa.
Conclusiones:
- Los intrones del Grupo II poseen una versatilidad catalítica significativa más allá de la auto-espleaje.
- Estos hallazgos sugieren nuevos mecanismos para la integración intron-ADN y la replicación del ARN en la vida temprana.
- Las actividades catalíticas implican un papel potencial para los intrones del grupo II en la evolución del genoma.
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