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El control de calidad de la dimerización asegura el desarrollo y la supervivencia neuronales

Elijah L Mena1, Rachel A S Kjolby1, Robert A Saxton1

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|September 8, 2018
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Resumen
Este resumen es generado por máquina.

Las células poseen una nueva vía de control de calidad que elimina los complejos de proteínas mal formados. Este sistema, que involucra a la ligasa SCFFBXL17, asegura la dimerización adecuada y la función celular, particularmente en el desarrollo neuronal.

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Área de la Ciencia:

  • Biología celular
  • Biología molecular
  • Regulación del complejo proteico

Sus antecedentes:

  • La formación de complejos proteicos aberrantes puede interrumpir las vías de señalización celular.
  • Los mecanismos por los que las células detectan y eliminan complejos de proteínas de composición irregular son en gran medida desconocidos.
  • Los módulos de interacción de proteínas recurrentes, como los dominios BTB, son propensos a la formación de complejos aberrantes.

Objetivo del estudio:

  • Investigar si las células poseen mecanismos para detectar y eliminar complejos proteicos de composición irregular.
  • Identificar los reguladores de las proteínas de la familia BTB involucradas en la formación de complejos.
  • Aclarar la función de una vía de control de calidad recién descubierta para la dimerización de proteínas.

Principales métodos:

  • Detección de reguladores de las proteínas de la familia BTB.
  • Ensayos bioquímicos para estudiar la unión a las proteínas y la ubicuidad.
  • Pruebas de degradación proteasomal.
  • Análisis de la cresta neuronal y la diferenciación, función y supervivencia de las células neuronales.

Principales resultados:

  • Descubrimiento de una vía de control de calidad de la dimerización (DQC) que asegura la dimerización funcional.
  • Identificación de la ligasa E3 SCFFBXL17 como un componente clave de la vía DQC.
  • Demostración de que el SCFFBXL17 se une selectivamente y ubicua los dímeros BTB aberrantes, apuntándolos hacia la degradación proteasómica.
  • Evidencia de que el SCFFBXL17 es esencial para la diferenciación, la función y la supervivencia de la cresta neuronal y las células neuronales.

Conclusiones:

  • Los organismos metazoares monitorean y regulan activamente la dimerización de la proteína BTB a través de un mecanismo de control de calidad.
  • La vía DQC, mediada por SCFFBXL17, es crucial para mantener la homeostasis celular y el desarrollo adecuado.
  • Se predice que mecanismos similares dependientes de la ligasa E3 controlan la formación de complejos para otros dominios de proteínas recurrentes.