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El complejo sensitivo a la auxina ABP1-TMK de la superficie celular activa la señalización de la ROP GTPasa ROP
Tongda Xu1, Ning Dai, Jisheng Chen
1Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
Science (New York, N.Y.)
|March 1, 2014
Resumen
La hormona vegetal auxina es una hormona de las plantas.
Área de la Ciencia:
- Biología Vegetal Biología Vegetal Biología Vegetal
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
Sus antecedentes:
- La proteína 1 de unión a las auxinas (ABP1) es crucial para el desarrollo y la morfogénesis de las plantas.
- El mecanismo preciso de acción de ABP1 ha permanecido elusivo durante décadas.
Objetivo del estudio:
- Para aclarar el mecanismo molecular de la señalización de la auxina mediada por ABP1.1.
- Para identificar los socios de proteínas y las vías involucradas en la función de ABP1.
Principales métodos:
- Investigó la interacción entre la ABP1 y las quinasas similares a los receptores de la cinasa transmembrana (TMK).
- Utilizado Arabidopsis como un organismo modelo.
- Se examinaron los eventos de señalización inducidos por auxinas en la membrana plasmática.
Principales resultados:
- Se descubrió que las quinasas similares al receptor TMK interactúan con ABP1 en la membrana plasmática.
- Se demostró que esta interacción, desencadenada por la auxina, activa las trifosfatasas de guanosina tipo Rho (ROPs).
- Se demostró que las ROPs activadas modulan el citoesqueleto, afectando la forma celular del pavimento de hojas.
Conclusiones:
- Las proteínas TMK y ABP1 forman un complejo de percepción de auxinas en la superficie celular.
- Este complejo inicia cascadas de señalización a través de ROPs, regulando las respuestas celulares no transcripcionales.
- Los hallazgos aclaran el papel de ABP1 en procesos fundamentales de las plantas como el desarrollo y la morfogénesis.
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