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• W4296703670 abstract "Abstract Intercellular communication plays a central role in organogenesis. Tissue morphogenesis in Arabidopsis thaliana requires signaling mediated by a cell surface complex containing the atypical receptor kinase STRUBBELIG (SUB) and the multiple C2 domains and transmembrane region protein QUIRKY (QKY). QKY is required to stabilize SUB at the plasma membrane. However, it is unclear what the in vivo architecture of the QKY/SUB signaling complex is, how it is controlled, and how it relates to the maintenance of SUB at the cell surface. Using a combination of yeast two-hybrid assays and Förster resonance energy transfer (FRET)/fluorescence lifetime imaging microscopy (FLIM) in epidermal cells of seedling roots we find that QKY promotes the formation of SUB homo-oligomers in vivo, a process that appears to involve an interaction between the extracellular domains of SUB. We also show that QKY and SUB physically interact and form a complex at the cell surface in vivo. In addition, the data show that the N-terminal C2A-B region of QKY interacts with the intracellular domain of SUB. They further reveal that this interaction is essential to maintain SUB levels at the cell surface. Finally, we provide evidence that QKY forms homo-multimers in vivo in a SUB-independent manner. We suggest a model in which the physical interaction of QKY with SUB mediates the oligomerization of SUB and attenuates its internalization, thereby maintaining sufficiently high levels of SUB at the cell surface required for the control of tissue morphogenesis." @default.
• W4296703670 created "2022-09-23" @default.
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• W4296703670 date "2022-09-21" @default.
• W4296703670 modified "2023-10-18" @default.
• W4296703670 title "The Arabidopsis MCTP member QUIRKY regulates the formation of the STRUBBELIG receptor kinase complex" @default.
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• W4296703670 doi "https://doi.org/10.1101/2022.09.20.508642" @default.
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