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Rice GLUTATHIONE PEROXIDASE1-mediated oxidation of bzip68 positively regulates ABA-independent osmotic stress signaling

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Molecular Plant 2022年第4期15卷 651-670页

作者： Heng Zhou Feng Zhang Fengchao Zhai Ye Su Ying Zhou Zhenglin Ge Priyadarshini Tilak Jürgen Eirich Iris Finkemeier Ling Fu Zongmin Li Jing Yang Wenbiao Shen Xingxing Yuan Yanjie Xie Laboratory Center of Life Sciences College of Life SciencesNanjing Agricultural UniversityNanjing 210095PR China Institute for Biology and Biotechnology of Plants University of Muenster48149 MuensterGermany State Key Laboratory of Proteomics Beijing Proteome Research CenterNational Center 17 for Protein SciencesBeijingBeijing Institute of LifeomicsBeijing 102206China Institute of Industrial Crops Jiangsu Academy of Agricultural SciencesNanjing 210014China

Osmotic stress caused by drought and high salinity is a significant environmental threat that limits plant growth and agricultural yield. Redox regulation plays an important role in plant stress responses, but the mechanisms by which plants perceive and transduce redox signals are still underexplored. Here, we report a critical function for the thiol peroxidase GPX1 in osmotic stress response in rice, where it serves as a redox sensor and transducer. GPX1 is quickly oxidized upon exposure to osmotic stress and forms an intramolecular disulfide bond, which is required for the activation of bzip68, a VRE-like basic leucine zipper (bzip) transcription factor involved in the ABA-independent osmotic stress response pathway. The disulfide exchange between GPX1 and bzip68 induces homo-tetramerization of bzip68 and thus positively regulates osmotic stress response by regulating osmotic-responsive gene expression. Furthermore, we discovered that the nuclear translocation of GPX1 is regulated by its acetylation under osmotic stress. Taken together, our findings not only uncover the redox regulation of the GPX1-bzip68 module during osmotic stress but also highlight the coordination of protein acetylation and redox signaling in plant osmotic stress responses.

关键词： GPX1 SOH oxidative stress acetylation zip68 transactivation

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