La caracterización estructural y funcional de la importación nuclear ATF2 revela un reconocimiento de importación paralelo-selectiva en α y un NLS no canónico formado en trans trans
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Seyed Mohammad Ghafoori1,2, Silvia Pavan3, Trinh Xuan Duc3
1School of Life and Environmental Sciences, University of Sydney, Sydney, Australia.
Life science alliance
|February 11, 2026
Resumen
El factor de transcripción de activación 2 (ATF2) entra en el núcleo a través del reconocimiento de importina-α de dos grupos básicos. Este estudio aclara los mecanismos de importación nuclear de ATF2, revelando las complejas vías de tráfico que involucran a importin-α y c-Jun.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La activación del factor de transcripción 2 (ATF2) es crucial para los procesos celulares, pero su importación nuclear es poco conocida.
- ATF2, un miembro de la superfamilia AP-1, regula el desarrollo neurológico, la inflamación y el cáncer.
Objetivo del estudio:
- Investigar las bases estructurales y funcionales de la importación nuclear de ATF2 a través de la vía de la importina-α/β1 (IMPα/β1).
- Identificar las regiones y mecanismos específicos que rigen la localización nuclear ATF2.
Principales métodos:
- Ensayos cuantitativos de unión in vitro y polarización por fluorescencia para medir las interacciones ATF2-IMPα.
- Análisis cristalográfico para determinar la interfaz de enlace entre ATF2 e IMPα1.1.
- Microscopía de barrido con láser confocal en células HEK293A para evaluar los mutantes de localización nuclear ATF2.
- La inhibición de las vías de importación / exportación nuclear utilizando Bimax2 y leptomycin B.
Principales resultados:
- ATF2 interactúa con múltiples parálogos de IMPα, con la mayor afinidad por IMPα1.
- Dos grupos básicos (sitio 1: 353-357, sitio 2: 372-374) en ATF2 son críticos para la unión de IMPα, siendo el sitio 1 dominante.
- Se requieren mutaciones en ambos grupos para abolir la importación nuclear ATF2; la inhibición de la importación clásica reduce la acumulación nuclear.
- c-Jun puede facilitar la importación nuclear de ATF2, lo que sugiere un papel en el tráfico a través de la heterodimerización.
Conclusiones:
- La importación nuclear ATF2 está mediada por el reconocimiento IMPα de dos grupos básicos distintos.
- El tráfico de armas nucleares ATF2 es complejo e implica mecanismos redundantes, incluida una posible facilitación para c-junio.
- Estos hallazgos proporcionan información estructural y funcional sobre la importación nuclear de ATF2, crucial para comprender sus roles en varios procesos celulares.
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