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Las proteínas represoras JAZ son objetivos del complejo SCF ((COI1)) durante la señalización del jasmonato
Bryan Thines1, Leron Katsir, Maeli Melotto
1Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA.
Nature
|July 20, 2007
Resumen
La señalización de la hormona vegetal jasmonato involucra las proteínas del dominio ZIM (JAZ) del jasmonato, que reprimen la transcripción génica. El tratamiento con jasmonato desencadena la degradación de JAZ1 a través del SCF (COI1) y el proteosoma, revelando un mecanismo regulador clave.
Área de la Ciencia:
- Biología Molecular Vegetal Biología Molecular Vegetal
- La señalización de la hormona vegetal de las plantas.
- Inmunidad vegetal Inmunidad vegetal.
Sus antecedentes:
- Los jasmonatos son hormonas vegetales cruciales que regulan la inmunidad y el desarrollo.
- Los mecanismos moleculares precisos de la señalización del jasmonato siguen siendo en gran medida desconocidos.
- Las proteínas Jasmonate ZIM-domain (JAZ) están implicadas como reguladoras en esta vía.
Objetivo del estudio:
- Para identificar los reguladores clave de la señalización del jasmonato.
- Para dilucidar el mecanismo molecular de la función y regulación de la proteína JAZ.
- Para entender la percepción de las moléculas de señalización del jasmonato.
Principales métodos:
- Identificación de los miembros de la familia de proteínas JAZ.
- Análisis del papel de la proteína JAZ1 en la represión transcripcional.
- Investigando la degradación de JAZ1 tras el tratamiento con jasmonato.
- Ensayos bioquímicos para estudiar las interacciones proteína-proteína (COI1-JAZ1).
Principales resultados:
- Las proteínas JAZ, incluyendo JAZ1, fueron identificadas como reguladores clave.
- JAZ1 reprime la transcripción de los genes sensibles al jasmonato.
- El tratamiento con jasmonato conduce a la degradación de JAZ1, dependiente del SCF (COI1) y el proteosoma 26S.
- El conjugado de jasmonoyl-isoleucina (JA-Ile) promueve específicamente la interacción COI1-JAZ1.
Conclusiones:
- Los ligandos de jasmonato promueven la unión de SCF ((COI1)) a JAZ1, lo que lleva a la degradación de JAZ1.
- El complejo SCF ((COI1) -JAZ1 está implicado como el sitio de percepción de la hormona JA-Ile.
- Este estudio revela un mecanismo regulador crítico en la señalización del jasmonato.
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