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Reconstitución del transporte de proteínas intercompartimentales dependientes del producto del gen SEC

D Baker¹, L Hicke, M Rexach

¹Department of Biochemistry, University of California, Berkeley 94720.

|July 29, 1988

Resumen

Los investigadores reconstituyeron el retículo endoplasmático para el transporte del aparato de Golgi en los esferoplastos de levadura. Este proceso requiere ATP y citosol, y está mediado por factores de transporte específicos como SEC23, cruciales para la función in vivo.

Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

El transporte intracelular es esencial para la modificación y secreción de proteínas.
La vía del retículo endoplasmático (ER) al aparato de Golgi es un paso crítico en el tráfico de proteínas.
Comprender la maquinaria molecular que rige el transporte ER-Golgi es clave para descifrar la función celular.

Objetivo del estudio:

Para reconstituir y analizar el transporte de ER a Golgi in vitro.
Para identificar y caracterizar los factores involucrados en el transporte inter-organelle.
Establecer un ensayo funcional para el estudio de los defectos de transporte ER-Golgi.

Principales métodos:

Reconstitución del transporte de ER a Golgi utilizando esferoplastos de levadura lizados suavemente.
Medición del transporte a través de la glicosilación del precursor del factor alfa.
Utilizando cepas de levadura mutante sec23 sensibles a la temperatura para ensayos de complementación in vitro.

Principales resultados:

El transporte de ER a Golgi es dependiente del ATP y es estimulado por el citosol.
El transporte se produce entre compartimentos sellados físicamente separables.
El producto del gen SEC23 es esencial para el transporte de ER a Golgi, como lo demuestra la complementación in vitro de membranas mutantes de sec23.

Conclusiones:

El transporte reconstituido in vitro refleja el tráfico de ER-Golgi in vivo.
La proteína SEC23 es un factor crítico para el transporte de ER a Golgi.
Los ensayos de complementación in vitro proporcionan una poderosa herramienta para purificar los factores de transporte y comprender los defectos de las vías secretoras.

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