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Identification of Footprints of RNA:Protein Complexes via RNA Immunoprecipitation in Tandem Followed by Sequencing (RIPiT-Seq)
Published on: July 10, 2019
Se requiere el desmontaje de mRNP Upf1 dependiente de la ATPasa para completar la desintegración del ARNm mediada por
Tobias M Franks1, Guramrit Singh, Jens Lykke-Andersen
1University of Colorado, Boulder, 80309, USA.
Cell
|December 15, 2010
Resumen
La helicasa de ARN Upf1 es
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Regulación de la expresión génica Regulación de la expresión génica
- El metabolismo del ARN.
Sus antecedentes:
- Los ARNm celulares están organizados en complejos de ribonucleoproteínas mensajeras (mRNP).
- Estos complejos regulan la expresión génica post-transcripcionalmente.
- La rotación del ARNm implica la degradación del ARNm y el reciclaje de proteínas, pero los mecanismos de liberación de proteínas no están claros.
Objetivo del estudio:
- Para investigar el mecanismo de liberación de proteínas de la degradación de los complejos de ribonucleoproteína mensajera (mRNP).
- Determinar el papel de la RNA helicasa Upf1 en el desmontaje de la ribonucleoproteína mensajera (mRNP) durante la desintegración del ARNm mediada por el no sentido (NMD).
Principales métodos:
- Estudió la actividad de la ATPasa de la RNA helicasa Upf1.1.
- Se investigó el desmontaje de la ribonucleoproteína mensajera (mRNP) durante la desintegración del ARNm mediada por no sentido (NMD).
- Se analizó la acumulación de los intermediarios de la ribonucleoproteína mensajera (mRNP) en ausencia de actividad de la ATPasa Upf1.
Principales resultados:
- Se demostró que la actividad de la ATPasa Upf1 impulsa el desmontaje de la ribonucleoproteína mensajera (mRNP) durante la desintegración del ARNm mediada por no sentido (NMD).
- Se observó una acumulación de ribonucleoproteínas mensajeras NMD (mRNP) intermedias parcialmente degradadas que carecen de actividad de la ATPasa Upf1.
- Se demostró que estos intermediarios permanecen asociados con los factores NMD y se localizan en los cuerpos de procesamiento.
Conclusiones:
- La hidrólisis de ATP por Upf1 es esencial para el desmontaje y la rotación de los complejos de ribonucleoproteína mensajera (mRNP) durante la desintegración del ARNm mediada por no sentido (NMD).
- Descubrieron un paso crítico y potencialmente regulado en la desintegración del ARNm que involucra la liberación de proteínas.
- Destaca la necesidad de explorar los mecanismos de liberación de proteínas en otras vías de descomposición del ARNm.
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