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El receptor nuclear huérfano de Drosophila DHR38 media una vía de señalización ecdisteroide atípica
Keith D Baker1, Lisa M Shewchuk, Tatiana Kozlova
1Howard Hughes Medical Institute and Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.
Cell
|June 18, 2003
Resumen
Los científicos descubrieron una nueva vía de señalización hormonal en las moscas de la fruta que involucra DHR38 y USP, independiente del conocido receptor de ecdisteroides (EcR). Este hallazgo revela una clase distinta de receptores nucleares conservados en todas las especies.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Endocrinología Endocrinología.
Sus antecedentes:
- Los ecdisteroides son hormonas cruciales que regulan el desarrollo de la Drosophila.
- El complejo del receptor ecdisteroide (EcR) /Ultraspiracle (USP) es el principal mediador de la señalización ecdisteroide.
- Los mecanismos precisos de todas las respuestas a los ecdisteroides aún no se comprenden por completo.
Objetivo del estudio:
- Para investigar las vías de señalización ecdisteroides alternativas en Drosophila.
- Para caracterizar el papel de DHR38 en la mediación de las transiciones del desarrollo.
- Para aclarar las propiedades estructurales y funcionales de DHR38 en la señalización de receptores nucleares.
Principales métodos:
- Ensayos de heterodimerización para estudiar la formación del complejo DHR38-USP.
- Pruebas bioquímicas para evaluar la independencia de la respuesta ecdisteroide de la EcR.
- Cristalografía de rayos X para determinar la estructura de DHR38.8.
Principales resultados:
- DHR38 forma un complejo heterodímero con USP, mediando una vía de señalización ecdisteroide distinta.
- Esta vía DHR38-USP funciona independientemente del receptor EcR.
- DHR38 carece de un bolsillo canónico de unión de ligandos, lo que sugiere un nuevo mecanismo de acción.
- El análisis estructural revela que DHR38 representa una clase estructural separada de receptores nucleares.
Conclusiones:
- Una nueva vía de señalización de ecdisteroides mediada por DHR38 y USP existe en Drosophila.
- Esta vía opera independientemente de EcR y no implica la unión directa de ecdisteroides a DHR38 o USP.
- DHR38 representa una clase estructuralmente distinta de receptores nucleares con implicaciones para los mecanismos de señalización conservados en los seres humanos.
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