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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
Published on: March 13, 2014
Análisis proteómico exhaustivo del espliceosoma humano
Zhaolan Zhou1, Lawrence J Licklider, Steven P Gygi
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|September 13, 2002
Resumen
Los investigadores identificaron aproximadamente 145 proteínas en el espliceosoma, una compleja máquina celular esencial para la expresión génica. Este exhaustivo inventario de proteínas revela nuevos componentes y destaca el papel del espliceosoma en la coordinación de los pasos de expresión génica.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El espliceosoma es una gran máquina molecular responsable de la eliminación de intrones del ARN pre-mensajero.
- Estudios previos caracterizaron los componentes del espliceosoma utilizando subcomplejos purificados, pero un inventario completo de la máquina intacta seguía siendo elusivo.
Objetivo del estudio:
- Para identificar la composición proteica completa de los espliceosomas funcionales.
- Caracterizar la complejidad y las posibles funciones reguladoras de las proteínas del espliceosoma.
Principales métodos:
- Aislamiento de espliceosomas intactos y funcionales utilizando cromatografía de afinidad de proteínas de unión a la maltosa.
- Análisis proteómico de espliceosomas aislados a través de cromatografía líquida microcapillar a nanoescala y espectrometría de masas en tándem.
Principales resultados:
- Identificación de aproximadamente 145 proteínas espliceosómicas distintas, estableciéndola como la máquina celular más compleja caracterizada hasta la fecha.
- Confirmación de todos los factores de empalme previamente conocidos y descubrimiento de 58 nuevos componentes.
- Encontrar que al menos 30 proteínas identificadas tienen funciones más allá del empalme, lo que sugiere funciones de expresión génica más amplias.
Conclusiones:
- El espliceosoma es una máquina altamente compleja con un repertorio de proteínas significativamente más grande de lo que se apreciaba anteriormente.
- La extensa red de proteínas dentro del espliceosoma probablemente facilita la intrincada regulación y el acoplamiento del empalme del ARN pre-mensajero con otros procesos de expresión génica.
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