ESCRT-I Mediates FLS2 Endosomal Sorting and Plant Immunity |
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Authors: | Thomas Spallek Martina Beck Sara Ben Khaled Susanne Salomon Gildas Bourdais Swen Schellmann Silke Robatzek |
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Affiliation: | 1.The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom;2.Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Cologne, Germany;3.Botanical Institute, Biocenter Cologne, Cologne, Germany;Virginia Tech, United States of America |
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Abstract: | The plant immune receptor FLAGELLIN SENSING 2 (FLS2) is present at the plasma membrane and is internalized following activation of its ligand flagellin (flg22). We show that ENDOSOMAL SORTING COMPLEX REQUIRED FOR TRANSPORT (ESCRT)-I subunits play roles in FLS2 endocytosis in Arabidopsis. VPS37-1 co-localizes with FLS2 at endosomes and immunoprecipitates with the receptor upon flg22 elicitation. Vps37-1 mutants are reduced in flg22-induced FLS2 endosomes but not in endosomes labeled by Rab5 GTPases suggesting a defect in FLS2 trafficking rather than formation of endosomes. FLS2 localizes to the lumen of multivesicular bodies, but this is altered in vps37-1 mutants indicating compromised endosomal sorting of FLS2 by ESCRT-I loss-of-function. VPS37-1 and VPS28-2 are critical for immunity against bacterial infection through a role in stomatal closure. Our findings identify that VPS37-1, and likewise VPS28-2, regulate late FLS2 endosomal sorting and reveals that ESCRT-I is critical for flg22-activated stomatal defenses involved in plant immunity. |
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