Overlapping functions and protein-protein interactions of LRR-extensins in Arabidopsis

Autoři: Aline Herger aff001;  Shibu Gupta aff001;  Gabor Kadler aff001;  Christina Maria Franck aff001;  Aurélien Boisson-Dernier aff002;  Christoph Ringli aff001
Působiště autorů: Institute of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland aff001;  Biocenter, Botanical Institute, University of Cologne, Cologne, Germany aff002
Vyšlo v časopise: Overlapping functions and protein-protein interactions of LRR-extensins in Arabidopsis. PLoS Genet 16(6): e32767. doi:10.1371/journal.pgen.1008847
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1008847


Plant cell growth requires the coordinated expansion of the protoplast and the cell wall, which is controlled by an elaborate system of cell wall integrity (CWI) sensors linking the different cellular compartments. LRR-eXtensins (LRXs) are cell wall-attached extracellular regulators of cell wall formation and high-affinity binding sites for RALF (Rapid ALkalinization Factor) peptide hormones that trigger diverse physiological processes related to cell growth. LRXs function in CWI sensing and in the case of LRX4 of Arabidopsis thaliana, this activity was shown to involve interaction with the transmembrane Catharanthus roseus Receptor-Like Kinase1-Like (CrRLK1L) protein FERONIA (FER). Here, we demonstrate that binding of RALF1 and FER is common to most tested LRXs of vegetative tissue, including LRX1, the main LRX protein of root hairs. Consequently, an lrx1-lrx5 quintuple mutant line develops shoot and root phenotypes reminiscent of the fer-4 knock-out mutant. The previously observed membrane-association of LRXs, however, is FER-independent, suggesting that LRXs bind not only FER but also other membrane-localized proteins to establish a physical link between intra- and extracellular compartments. Despite evolutionary diversification of various LRX proteins, overexpression of several chimeric LRX constructs causes cross-complementation of lrx mutants, indicative of comparable functions among members of this protein family. Suppressors of the pollen-growth defects induced by mutations in the CrRLK1Ls ANXUR1/2 also alleviate lrx1 lrx2-induced mutant root hair phenotypes. This suggests functional similarity of LRX-CrRLK1L signaling processes in very different cell types and indicates that LRX proteins are components of conserved processes regulating cell growth.

Klíčová slova:

Cell membranes – Membrane proteins – Phenotypes – Plant cell walls – Protein domains – Protein interactions – Root hairs – Seedlings


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