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Los circuitos sensoriales controlan la fototransducción citocroma B mediada por el calcio

Yan Zhao¹, Hui Shi², Ying Pan¹

¹State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing 100871, China.

|March 17, 2023

Resumen

La señalización de calcio controla la importación nuclear del fitocromo B (phyB) en las plantas. Las proteínas cinasas dependientes de calcio (CPKs) fosforilan el phyB activado, permitiendo su translocación y mediando las respuestas tempranas a la luz.

Área de la Ciencia:

Biología vegetal
Señales moleculares
Fototransducción

Sus antecedentes:

Los iones de calcio (Ca2+) son intermediarios conocidos en la transducción visual, pero su papel en la fototransducción de las plantas no está claro.
El fitocromo B (phyB) es un fotorreceptor clave que regula las respuestas de las plantas a la luz, particularmente durante la transición de la oscuridad a la luz.

Objetivo del estudio:

Para aclarar el papel de la señalización de Ca2+ en la fototransducción de las plantas.
Investigar el mecanismo por el cual se regula el phyB durante la transición de la oscuridad a la luz.

Principales métodos:

Se investigó la señalización de Ca2+ en plántulas etioladas durante la transición de la oscuridad a la luz.
Utilizó mutaciones genéticas (phyB^S80A/S106A) y señales de localización nuclear para estudiar la función phyB.
Se examinó la interacción entre phyB, las proteínas cinasas de unión a Ca2+ (CPK6/12) y Ca2+.

Principales resultados:

La luz roja desencadena aumentos de Ca2+ a través de phyB, activando la CPK6/12.
El CPK6/12 activado fosforila directamente el phyB fotoactivado en Ser80/Ser106, iniciando la importación nuclear.
La fosforilación en Ser80/Ser106 es esencial para la translocación nuclear de phyB y la función en la expansión del cotiledón.

Conclusiones:

Una vía de señalización Ca2+ regula la translocación nuclear de phyB en respuesta a la luz roja.
CPK6 / 12 actúan como mediadores clave, vinculando las señales de Ca2 + a la fosforilación de phyB y la importación nuclear.
Este estudio revela un bucle regulador en la fototransducción de phyB, que conecta la señalización de Ca2+ con respuestas específicas a la luz.

Palabras clave:

señalización del calcio Transducción de señales luminosas Translocación nuclear El fitocromo B Sensores y receptores

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