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Proteínas de la capa citoplasmática involucradas en la función del endosoma.

J A Whitney¹, M Gomez, D Sheff

¹Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520-8002, USA.

|December 1, 1995

Resumen

Los endosomas reclutan proteínas específicas de la capa citoplasmática, incluidas las familias COP-I y ARF, de manera regulada. Este reclutamiento de proteínas es crucial para la función del endosoma y el transporte durante la endocitosis.

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Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular

Sus antecedentes:

Los endosomas son fundamentales para la endocitosis mediada por receptores, que implica la clasificación y el transporte de proteínas a través de las vesículas.
La función del endosoma depende del ensamblaje regulado de los complejos de la capa citoplasmática.

Objetivo del estudio:

Para investigar el reclutamiento de proteínas citoplasmáticas en los endosomas.
Para identificar las proteínas de capa involucradas en la función y el transporte del endosoma.

Principales métodos:

Estudios in vitro de reclutamiento de proteínas endosómicas.
Estimulación con GTP gamma S y brefeldina A. Estimulación con GTP gamma S y brefeldina A. Estimulación con GTP gamma S y brefeldina A. Estimulación con GTP gamma S y brefeldina A.
Análisis de las proteínas de capa reclutadas, incluidos COP-I, ARF y complejos similares a la clatrina.

Principales resultados:

Los endosomas reclutan proteínas citoplasmáticas específicas de una manera estimulada por GTP gamma S y sensible a la brefeldina A.
Las proteínas reclutadas incluyen miembros de las familias COP-I y ARF, así como capas similares a la clatrina.
Los anticuerpos contra la beta-COP inhiben la entrada viral a través de la vía endocítica.

Conclusiones:

El ensamblaje regulado de los complejos de la capa citoplasmática gobierna la función endosómica.
COP-I o proteínas relacionadas son esenciales para la función endosómica en las células intactas.
Los endosomas utilizan capas distintas, parecidas a la clatrina, para los procesos de transporte.