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Los terminales C de las criptocromas de Arabidopsis median una respuesta constitutiva a la luz

H Q Yang¹, Y J Wu, R H Tang

¹Plant Science Institute Department of Biology University of Pennsylvania, Philadelphia, PA 19104, USA.

|December 15, 2000

Resumen

La señalización criptocromática de Arabidopsis está mediada por su dominio C-terminal. La luz azul activa el criptocromo al aliviar la represión del C-terminal, probablemente a través de una reacción redox que involucra el cofactor flavin.

Área de la Ciencia:

Biología molecular vegetal Biología molecular vegetal
Fotobiología Fotobiología.
La bioquímica es la bioquímica.

Sus antecedentes:

Los criptocromos son fotorreceptores de luz azul relacionados con las fotoliasas.
A diferencia de las fotoliasas, los criptocromos carecen de actividad de reparación del ADN y poseen dominios C-terminales únicos.

Objetivo del estudio:

Para investigar el papel del dominio C-terminal en la señalización criptocromática de Arabidopsis.
Para dilucidar el mecanismo por el cual la luz azul activa el criptocromo.

Principales métodos:

Fusión de los dominios C-terminales de Arabidopsis CRY1 y CRY2 (CCT1, CCT2) con la beta-glucuronidasa (GUS).
Análisis de las proteínas de fusión resultantes para el fenotipo fotomorfogénico (COP) constitutivo.
Comparación con los mutantes cri1 descritos anteriormente.

Principales resultados:

Las proteínas de fusión CCT1-GUS y CCT2-GUS exhibieron una respuesta a la luz constitutiva.
Este fenotipo COP no se observó en los mutantes cri1 previamente caracterizados.
Sugiere que el dominio C-terminal es crucial para la señalización mediada por luz.

Conclusiones:

El dominio C-terminal de Arabidopsis cryptochrome media la señalización de la luz.
La luz azul probablemente activa el criptocromo al aliviar la represión mediada por el dominio C-terminal.
Se propone una reacción redox intra o intermolecular que involucre el cofactor flavin para mediar esta activación.

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