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Separación de fase de una subunidad reguladora de PKA Controles de compartimentación de AMP y señalización oncogénica
Jason Z Zhang1, Tsan-Wen Lu2, Lucas M Stolerman3
1Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093, USA; Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA.
Cell
|August 27, 2020
Resumen
La subunidad reguladora de tipo I de la proteína quinasa dependiente de cAMP (PKA), RIα, forma condensados biomoleculares a través de la separación de fase líquido-líquido (LLPS), organizando la señalización del monofosfato de adenosina cíclica (cAMP). La desregulación de RIα LLPS impulsa la progresión del cáncer.
Área de la Ciencia:
- Biología celular
- La bioquímica
- Oncología molecular
Sus antecedentes:
- La fidelidad de la señalización intracelular depende de las arquitecturas de actividad organizadas.
- La compartimentación espacial de la señalización del monofosfato de adenosina cíclica (cAMP) es crucial para la especificidad del receptor acoplado a la proteína G.
- Los mecanismos para restringir espacialmente el mensajero cAMP difusible siguen siendo en gran medida desconocidos.
Objetivo del estudio:
- Para elucidar los mecanismos subyacentes a la compartimentación espacial de la cAMP.
- Investigar el papel de la subunidad reguladora de tipo I de PKA (RIα) en la organización de la señalización cAMP.
- Determinar las implicaciones patológicas de la alteración de la función RIα.
Principales métodos:
- Ensayos bioquímicos para estudiar el comportamiento de RIα.
- Análisis de la dinámica de la separación de fase líquido-líquido (LLPS).
- Técnicas de biología celular y molecular para evaluar la señalización y la transformación.
- Investigación de un modelo de oncoproteína de fusión PKA.
Principales resultados:
- RIα se somete a una separación de fase líquido-líquido (LLPS) dependiente de cAMP para formar condensados biomoleculares.
- Estos condensados están enriquecidos con actividad de cAMP y PKA, lo que permite la compartimentación de cAMP.
- Una oncoproteína de fusión PKA inhibe el RIα LLPS, lo que lleva a una señalización cAMP aberrante.
- La pérdida de RIα LLPS en células normales promueve la proliferación y la transformación.
Conclusiones:
- La separación de fase líquido-líquido (LLPS) es un mecanismo clave para organizar los compartimentos de señalización intracelular.
- El LLPS mediado por RIα es crítico para mantener la fidelidad de la señalización cAMP.
- La desregulación de RIα LLPS por fusiones oncogénicas contribuye al desarrollo y progresión del cáncer.
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