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SICOPID_Activation and regulation of plasma membrane receptor signaling complexes controlling plant development and immunity, and their connection to downstream signaling cascades

Subject Area Organismic Interactions, Chemical Ecology and Microbiomes of Plant Systems
Plant Cell and Developmental Biology
Term from 2018 to 2022
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 354195343
 
Final Report Year 2022

Final Report Abstract

The SICOPID project aimed at characterizing how different signaling complexes embedded in cellular membrane of plant cells can sense and transmit different signals. Plants have evolved a unique set of membrane receptor kinases and receptor-like proteins that enable cells to sense different extracellular signals. The joint project has analyzed how these receptors can sense foreign and plant-generated peptide ligands to activate developmental pathways, or the plant immune system. Next, specific downstream molecular switches, namely protein kinases were identified that enable the transmission of the signal from the cell membrane to the cell’s interior, where changes in gene activity can generate the desired signaling outputs. It was found that receptor kinases and receptor-like proteins use a partially common, partially unique set of downstream components in plant immune signaling. The project has in addition characterized different regulatory systems that can affect the propagation of the receptor signal. (1) Protein phosphatases that can negatively regulate the function of receptor kinases, and (2) MAKR protein inhibitors that can bind to specific receptor kinases to block their activation. Taken together, plant receptor kinases and receptor-like proteins have evolved to sense a large set of different ligands to control various aspects of plant development and to form the first defense layer of the plant immune system. The SICOPID project has characterized in molecular terms how signaling specificity is achieved in several different pathways, and has identified enzymes and inhibitor proteins that have the ability to modulate the signaling capacity of specific receptors. Finally, genetic tools have been developed that enable to investigate the impact of constitutive activation of plant receptor kinases on plant development and immune signaling.

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