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Bases estructurales del complejo ternario VCP-VCPIP1-p47 en el mantenimiento de Golgi
Binita Shah1,2, Moritz Hunkeler1,2, Ariana Bratt1,2
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA.
Nature communications
|August 28, 2025
Resumen
La proteína que contiene valosina (VCP) trabaja con p47 y VCPIP1 para reconstruir el Golgi después de la división celular. Los estudios estructurales revelan cómo estas proteínas forman un complejo, destacando el VCPID
Área de la Ciencia:
- Biología celular
- Biología estructural
- La bioquímica
Sus antecedentes:
- La proteína que contiene valosina (VCP/p97) es crucial para los procesos celulares, incluido el reensamblaje de Golgi después de la mitosis.
- VCPIP1 (una deubiquitylase) y p47 (una proteína adaptadora) son cofactores conocidos que ayudan a la VCP en la biogénesis de Golgi.
Objetivo del estudio:
- Para aclarar la organización estructural de los complejos ternales VCP-VCPIP1 y VCP-VCPIP1-p47.
- Comprender los mecanismos moleculares por los cuales estos cofactores interactúan con el VCP para facilitar el reensamblaje de Golgi.
Principales métodos:
- Se empleó cryo-microscopía electrónica (cryo-EM) para determinar las estructuras de los complejos VCP-VCPIP1 y VCP-VCPIP1-p47.
- Se realizaron ensayos bioquímicos y experimentos celulares para validar los hallazgos estructurales y evaluar la importancia funcional.
Principales resultados:
- VCPIP1 se une a VCP a través de dos interfaces distintas: VCP N-dominio / VCPIP1 dominio UBX y VCP D2 dominios / VCPIP1 región VCPID.
- El dominio p47 UBX compite por la unión al dominio N del VCP pero no interfiere con la interacción del VCPID.
- La región VCPID de VCPIP1 es esencial para mejorar la actividad de la deubiquitylase de VCP y garantizar un ensamblaje de Golgi adecuado.
Conclusiones:
- El estudio proporciona estructuras de alta resolución de complejos clave de cofactores VCP, revelando nuevas interfaces de interacción.
- El VCPID se identifica como un elemento funcional crítico para el reensamblaje de Golgi mediado por el VCP y la mejora de la actividad DUB.
- Estos hallazgos ofrecen información significativa sobre la intrincada interacción entre el VCP y sus socios reguladores en los procesos celulares.
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