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El segmento carboxiterminal del receptor del factor alfa de la levadura es un dominio regulador
J E Reneke1, K J Blumer, W E Courchesne
1Department of Biochemistry University of California, Berkeley 94720.
Cell
|October 21, 1988
Resumen
El receptor del factor alfa.
Área de la Ciencia:
- Biología celular Biología celular.
- Estudios moleculares y genéticos de las vías de señalización de la levadura.
Sus antecedentes:
- El receptor del factor alfa se hiperfosforila rápidamente tras la exposición a las feromonas.
- Los receptores mutantes con dominios C-terminales alterados son biológicamente activos, pero muestran hipersensibilidad y deterioro de la recuperación.
Objetivo del estudio:
- Investigar el papel del dominio C-terminal en la regulación y adaptación del receptor del factor alfa.
- Para comprender los mecanismos de adaptación de la respuesta feromónica en la levadura.
Principales métodos:
- Construcción y análisis de receptores mutantes del factor alfa con dominios C-terminales alterados.
- Evaluación de la actividad de los receptores, la unión de ligandos y la endocitosis.
- Análisis genético que involucra la función SST2.
Principales resultados:
- Los receptores mutantes que faltan o están alterados en el dominio C-terminal exhiben hipersensibilidad y defectos en la recuperación de la detención del crecimiento.
- Los truncamientos parciales del extremo C conducen a una endocitosis inducida por ligandos, lo que indica complejos mecanismos de adaptación.
- La eliminación completa del dominio C-terminal elimina la endocitosis inducida por ligandos.
- La adaptación mediada por SST2 no depende del dominio C-terminal del receptor.
Conclusiones:
- El dominio C-terminal del receptor del factor alfa juega un papel crucial en la adaptación y recuperación de la señalización de feromonas.
- La regulación a la baja de los receptores a través de la endocitosis es un mecanismo de adaptación clave, pero no el único.
- La función de SST2 en la adaptación es independiente del dominio C-terminal del receptor del factor alfa.
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