Blue-light dependent ROS formation by Arabidopsis cryptochrome-2 may contribute toward its signaling role - Biological Adaptation and Ageing Accéder directement au contenu
Article Dans Une Revue Plant Signaling and Behavior Année : 2015

Blue-light dependent ROS formation by Arabidopsis cryptochrome-2 may contribute toward its signaling role

Nathalie Jourdan
Carlos F. Martino
  • Fonction : Auteur
Mohamed El-Esawi
  • Fonction : Auteur
Jacques Witczak
  • Fonction : Auteur
Pierre-Etienne Bouchet
  • Fonction : Auteur
Alain d'Harlingue
  • Fonction : Auteur
Margaret Ahmad
  • Fonction : Auteur

Résumé

Cryptochromes are blue-light absorbing flavoproteins with many important signaling roles in plants, including in de-etiolation, development, and stress response. They interact with downstream signaling partners such as transcription factors and components of the proteasome, and thereby alter regulation of nuclear gene expression in a light dependent manner. In a prior study, it has also been shown that Arabidopsis cry1 activation by blue light results in direct enzymatic conversion of molecular oxygen (O2) to ROS (reactive oxygen species) in vivo leading to cell death in overexpressing lines. Here we extend these observations to show that Atcry2 is translocated from the cytosol to the nucleus in response to blue light illumination, resulting in nuclear accumulation of ROS in expressing insect cell cultures. These observations suggest that ROS formation may represent a novel means of signaling by Atcry2 distinct from, and perhaps complementary to, the currently known mechanism of light-mediated conformational change.

Dates et versions

hal-01545368 , version 1 (22-06-2017)

Identifiants

Citer

Nathalie Jourdan, Carlos F. Martino, Mohamed El-Esawi, Jacques Witczak, Pierre-Etienne Bouchet, et al.. Blue-light dependent ROS formation by Arabidopsis cryptochrome-2 may contribute toward its signaling role. Plant Signaling and Behavior, 2015, 10 (8), pp.e1042647. ⟨10.1080/15592324.2015.1042647⟩. ⟨hal-01545368⟩
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