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Ufer, Guido; Gertzmann, Anke; Gasulla, Francisco; Rohrig, Horst; Bartels, Dorothea
The Plant journal : for cell and molecular biology, 10/2017, Letnik: 92, Številka: 2Journal Article
Summary Phospholipase D (PLD) and its cleavage product phosphatidic acid (PA) are crucial in plant stress-signalling. Although some targets of PLD and PA have been identified, the signalling pathway is still enigmatic. This study demonstrates that the phosphoprotein At5g39570, now called PLD-regulated protein1 (PLDrp1), from Arabidopsis thaliana is directly regulated by PLDalpha1. The protein PLDrp1 can be divided into two regions with distinct properties. The conserved N-terminal region specifically binds PA, while the repeat-rich C-terminal domain suggests interactions with RNAs. The expression of PLDrp1 depends on PLDalpha1 and the plant water status. Water stress triggers a pldalpha1-like phenotype in PLDrp1 mutants and induces the expression of PLDrp1 in pldalpha1 mutants. The regulation of PLDrp1 by PLDalpha1 and environmental stressors contributes to the understanding of the complex PLD regulatory network and presents a new member of the PA-signalling chain in plants. Significance Statement This manuscript reports PLDrp1 protein as a target of PLD. This protein specifically binds to phosphatidic acid.
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