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Chanhong Kim's research group reveals new progress of chloroplast ROS sensor proteins EXECUTER1 and EXECUTER2

 Last Update: 2022-03-09
 Source: Internet
 Author: User

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On December 28, 2021, the research group of Chanhong Kim, Research Center for Stress Biology, Center for Excellence in Molecular Plant Science, Chinese Academy of Sciences , published a research paper entitled "EXECUTER2 modulates the EXECUTER1 signalosome through its singlet oxygen-dependent oxidation" on Molecular Plant

Under photooxidative stress conditions, photosystem II (PSII) produces a harmful oxygen molecule, ¹ O ₂

The current study found that, as a similar protein of EX1, the tryptophan residue (Trp530) at position 530 of EX2 protein also undergoes ¹ O ₂ -dependent oxidation

One might ask why the chloroplast needs such a system in which the function of its homologue (EX1) is antagonized by one of its closely related proteins (EX2)? _{Given that EX1 -} mediated ¹ O signaling is capable of inducing cell death, it appears that EX2 may regulate EX1 's sensitivity to ¹ O through this system to prevent chloroplast hypersensitivity responses to ₁ O ⁽ such as growth inhibition and cell death ₎ ) (Kim et al.

_{Post -}translational oxidative modification of Trp residues in EX1 and EX2 regulates ¹ O signaling .

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