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Los túbulos ER marcan los sitios de la división mitocondrial
Jonathan R Friedman1, Laura L Lackner, Matthew West
1Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.
Science (New York, N.Y.)
|September 3, 2011
Resumen
El retículo endoplasmático (ER) guía activamente la división mitocondrial mediante la constricción de sitios antes del reclutamiento de proteínas. Este hallazgo revela un nuevo mecanismo que controla la dinámica mitocondrial y la estructura celular.
Área de la Ciencia:
- Biología celular Biología celular.
- La dinámica mitocondrial es la dinámica mitocondrial.
- Función del retículo endoplasmático Función del retículo endoplasmático
Sus antecedentes:
- La estructura y distribución mitocondrial dependen de una división y fusión reguladas.
- La proteína Dnm1/Drp1 media la división mitocondrial mediante la formación de estructuras helicoidales.
- Las ubicaciones precisas de la división mitocondrial dentro de la red siguen siendo poco conocidas.
Objetivo del estudio:
- Investigar el papel potencial del retículo endoplasmático (ER) en la determinación de los sitios de división mitocondrial.
- Para dilucidar el mecanismo por el cual ER influye en la fisión mitocondrial.
Principales métodos:
- Estudios observacionales de las interacciones mitocondriales y ER.
- Análisis de los sitios de contacto del túbulo ER con las mitocondrias.
- Evaluación de la constricción mediada por ER anterior al reclutamiento de Drp1 durante la división mitocondrial.
Principales resultados:
- Los eventos de división mitocondrial se observaron consistentemente en los sitios de contacto con los túbulos ER.
- Se encontró que los túbulos ER mediaban la constricción en estos sitios de contacto antes del reclutamiento de la proteína Drp1.
- La evidencia sugiere que ER juega un papel directo en el posicionamiento de la división mitocondrial.
Conclusiones:
- El retículo endoplasmático participa activamente en la regulación de la división mitocondrial.
- Los túbulos ER actúan como señales espaciales, definiendo los sitios donde se dividen las mitocondrias.
- Esta interacción pone de relieve un nuevo mecanismo de acoplamiento ER y la dinámica mitocondrial.
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