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La proteína de acoplamiento vesicular p115 se une a GM130, una proteína de la matriz cis-Golgi, de una manera
N Nakamura1, M Lowe, T P Levine
1Cell Biology Laboratory, Imperial Cancer Research Fund, London, United Kingdom.
Cell
|May 2, 1997
Resumen
GM130, una proteína de la matriz cis-Golgi, se une a p115, una proteína que media el acoplamiento de las vesículas. Esta interacción, regulada por la fosforilación mitótica, explica la fragmentación de Golgi durante la división celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La función del aparato de Golgi La función del aparato de Golgi
Sus antecedentes:
- El transporte de vesículas y el acoplamiento de la membrana son cruciales para la organización celular.
- La proteína p115 está implicada en la mediación del acoplamiento de las vesículas de transporte a las membranas objetivo.
- El papel de la proteína de la matriz cis-Golgi GM130 en este proceso no se entiende completamente.
Objetivo del estudio:
- Para investigar la interacción entre GM130 y p115.5.
- Para dilucidar el mecanismo molecular subyacente a la fragmentación de Golgi durante la mitosis.
Principales métodos:
- Co-inmunoprecipitación para estudiar las interacciones de las proteínas.
- Análisis de eliminación para mapear dominios vinculantes.
- Pruebas de inhibición de péptidos.
- Análisis del reensamblaje de Golgi de fragmentos mitóticos.
Principales resultados:
- GM130 interactúa específicamente con p115, lo que sugiere que GM130 es un posible sitio de acoplamiento de membrana.
- El extremo N de GM130 se une a p115, mientras que el extremo C se une a las membranas de Golgi.
- La fosforilación mitótica de GM130 inhibe su unión a p115.
- Los péptidos GM130 fosforilados inhiben el reensamblaje de Golgi dependiente de NSF, pero no el reensamblaje dependiente de p97.
Conclusiones:
- GM130 actúa como un sitio de acoplamiento para p115, que une el transporte de vesículas con el Golgi.
- La fosforilación mitótica de GM130 interrumpe la unión de p115, lo que contribuye a la fragmentación de Golgi.
- Estos hallazgos proporcionan una base molecular para la fragmentación de Golgi mediada por COPI durante la mitosis.
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