Redox-mediated structural and functional switching of C-repeat binding factors enhances plant cold toleranceopen access
- Wi, Seong Dong; Lee, Eun Seon; Park, Joung Hun; Chae, Ho Byoung; Paeng, Seol Ki; Bae, Su Bin; Phan, Thi Kieu Anh; Kim, Woe-Yeon; Yun, Dae-Jin; Lee, Sang Yeol
- Issue Date
- cold stress; pleiotropic roles of CBFs; reactive oxygen species (ROS); redox relay; structural and functional switching
- NEW PHYTOLOGIST, v.233, no.3, pp.1067 - 1073
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- NEW PHYTOLOGIST
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- C-repeat binding factors (CBFs) are key cold-responsive transcription factors that play pleiotropic roles in the cold acclimation, growth, and development of plants. Cold-sensitive cbf knockout mutants and cold-tolerant CBF overexpression lines exhibit abnormal phenotypes at warm temperatures, suggesting that CBF activity is precisely regulated, and a critical threshold level must be maintained for proper plant growth under normal conditions. Cold-inducible CBFs also exist in warm-climate plants but as inactive disulfide-bonded oligomers. However, upon translocation to the nucleus under a cold snap, the h2-isotype of cytosolic thioredoxin (Trx-h2), reduces the oxidized (inactive) CBF oligomers and the newly synthesized CBF monomers, thus producing reduced (active) CBF monomers. Thus, the redox-dependent structural switching and functional activation of CBFs protect plants under cold stress.
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