Involved in the perception of necrosis and ethylene-inducing peptide 1-like proteins (NLPs), that act as extracellular signals mediating immune activation. Component of the RLP23-SOBIR1-BAK1 complex that mediates NLP-triggered immunity. Directly interacts with a 20-mer fragment (nlp20) from NLPs through its extracellular LRR domain. Component of a trimeric complex composed of RLP23, SOBIR1 and BAK1. BAK1 is recruited into a pre-formed RLP23-SOBIR1 complex in a ligand-dependent manner (PubMed:27251392). Interacts with SOBIR1 (PubMed:24525519, PubMed:27251392). By mannitol. Impaired in nlp20-mediated immunity. Belongs to the RLP family.