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Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling
Published on: October 28, 2014
Muchas proteínas citoesqueléticas se asocian con el citoesqueleto hela durante la traducción in vitro
Cell
|February 1, 1983
Resumen
Las proteínas citoesqueléticas se unen al citoesqueleto durante su síntesis. Este estudio in vitro confirma que estas proteínas se asocian con el citoesqueleto mientras se están formando, no después.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Dinámica del citoesqueleto Dinámica del citoesqueleto
Sus antecedentes:
- Se sabe que las proteínas citoesqueléticas se ensamblan in vivo cerca de su sitio de síntesis.
- Estudios previos sugirieron un vínculo temporal y espacial entre la síntesis de proteínas y el ensamblaje citoesquelético.
Objetivo del estudio:
- Investigar el momento preciso y el mecanismo de la asociación de proteínas citoesqueléticas con el citoesqueleto.
- Para determinar si las proteínas citoesqueléticas se asocian con la estructura existente durante o después de la traducción.
Principales métodos:
- Utilizó un sistema de traducción in vitro con citoesqueletos HeLa preparados.
- Incorporado 35S-metionina en polipéptidos durante la traducción en un buffer especializado.
- Evaluó la estabilidad y las propiedades de asociación de las proteínas recién sintetizadas con el citoesqueleto.
Principales resultados:
- Los citoesqueletos HeLa incorporaron eficientemente la 35S-metionina en los polipéptidos in vitro.
- Proteínas citoesqueléticas recién sintetizadas asociadas con el citoesqueleto independientemente de la concentración de proteínas solubles.
- Estas asociaciones eran resistentes a la puromicina antes de la compleción de la proteína, lo que indica una unión co-traducional.
- Las asociaciones in vitro se parecían mucho a las asociaciones de proteínas in vivo.
Conclusiones:
- Muchas proteínas citoesqueléticas se asocian con el citoesqueleto durante el proceso de traducción.
- Este mecanismo de asociación co-traducional es un factor clave en la organización del citoesqueleto.
- Los hallazgos proporcionan una comprensión refinada de la dinámica y el ensamblaje de las proteínas citoesqueléticas.
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