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Sample Preparation for Mass Spectrometry-based Identification of RNA-binding Regions
Published on: September 28, 2017
Evidencia funcional para una plantilla de ARN en la telomerasa
D Shippen-Lentz1, E H Blackburn
1Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Resumen
Los investigadores identificaron el componente de ARN de la telomerasa de Euplotes crassus. Este ARN actúa como una plantilla, demostrando directamente su papel en la síntesis de repeticiones teloméricas y la definición de la telomerasa como una transcriptasa inversa.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La telomerasa es una enzima de ribonucleoproteína responsable de mantener la longitud de los telómeros.
- La función del componente de ARN como plantilla ha sido hipotetizada pero no demostrada directamente en muchos organismos.
Objetivo del estudio:
- Para identificar y secuenciar la fracción de ARN de la telomerasa de Euplotes crassus.
- Para caracterizar funcionalmente la actividad de la plantilla del ARN de la telomerasa in vitro.
- Para definir la telomerasa en función de su actividad de transcriptasa inversa con plantilla de ARN.
Principales métodos:
- Identificación y secuenciación de genes del ARN de la telomerasa.
- Ensayos funcionales in vitro que utilizan oligonucleótidos complementarios para probar el RNA priming.
- Análisis de secuencias de repetición teloméricas sintetizadas.
Principales resultados:
- El gen para el ARN telomerasa de Euplotes crassus fue secuenciado con éxito.
- Se identificó una secuencia específica de ARN (5' CAAAACCCCAAA 3') como la plantilla para la síntesis de repetición de TTTTGGGG.
- Se proporcionaron pruebas directas para la función de la plantilla del ARN telomerasa.
Conclusiones:
- El estudio proporciona la primera demostración directa de la función de la plantilla de un ARN telomerasa.
- Los hallazgos demarcan los límites de la plantilla telomérica dentro del ARN.
- La telomerasa se define funcionalmente como una enzima especializada de transcriptasa inversa.
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