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Mecanismos de la percepción del péptido RALF por un complejo de receptores heterotípicos

Yu Xiao¹, Martin Stegmann^2,3, Zhifu Han¹

¹School of Life Sciences, Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Tsinghua University, Beijing, China.

|July 11, 2019

Resumen

Los investigadores descubrieron cómo las plantas perciben las señales utilizando quinasas receptoras y proteínas ancladas al GPI. Este hallazgo explica cómo los péptidos del FACTOR DE ALCALINIZACIÓN RÁPIDA (RALF) regulan el crecimiento y la inmunidad de las plantas.

Área de la Ciencia:

Biología molecular de las plantas
Vías de señalización de las plantas
Señalización de la pared celular de las plantas

Sus antecedentes:

Las quinasas receptoras de tipo RLK1 (CrRLK1L) de Catharanthus roseus son cruciales para el desarrollo de las plantas y las respuestas ambientales.
Los péptidos del FACTOR DE ALCALINIZACIÓN RÁPIDA (RALF) son ligandos propuestos para las quinasas CrRLK1L, pero el mecanismo de percepción sigue sin estar claro.

Objetivo del estudio:

Aclarar el mecanismo molecular por el cual las plantas perciben los péptidos RALF.
Investigar la interacción entre las quinasas RALF23, CrRLK1L y la proteína 1 (LLG1) anclada al glicosilfosfatidilinositol (GPI) de tipo LORELEI (LRE).

Principales métodos:

Se utilizaron análisis estructurales y bioquímicos para estudiar las interacciones de las proteínas.
Se realizaron ensayos vinculantes para determinar la especificidad y el mecanismo de reconocimiento del péptido.

Principales resultados:

RALF23 forma un complejo con FERONIA (FER) y LLG1, crucial para la señalización inmune.
LLG1 y LLG2 se unen directamente a RALF23, nucleando la formación de los heterocomplejos RALF23-LLG1-FER y RALF23-LLG2-FER.
Una región N-terminal conservada de RALF23 es clave para el reconocimiento por parte de las proteínas LLG, con flexibilidad en las regiones C-terminal de LLG que rigen la unión.

Conclusiones:

Las plantas perciben las señales peptídicas a través de un nuevo mecanismo que involucra proteínas ancladas a GPI y quinasas receptoras no relacionadas.
Este estudio proporciona un marco molecular para comprender cómo los diversos péptidos RALF regulan los procesos vegetales a través de complejos proteicos CrRLK1L y LLG distintos.

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