Fig. 1

Schematic representation of chimeric receptors expressed in L. japonicus. a Each hybrid receptor contains an ectodomain of a given LysM receptor and an intracellular domain of a L. japonicus Nod factor receptor protein (NFR1 and NFR5, respectively). Constitutive or ligand-induced interactions of ectodomains result in downstream signaling and NIN expression. b Chimeric receptors used in this study. Letters followed by numbers indicate positions of amino acids forming the fusion points. The kinase domain of NFR1^ID is functional and that of NFR5^ID is likely non-functional. PM plasma membrane, SP signal peptide, LysM LysM domain, TM transmembrane region, ED ectodomain, ID intracellular domain