CC-NB-LRR receptor-like protein required for recognition of pathogenic bacteria type III effectors (T3E) such as Pseudomonas syringae HopZ1a and HopF2a and Xanthomonas campestris pv. campestris (Xcc) XopAC/AvrAC; this recognition requires ZED1-related kinases (e.g. PBL2, ZRK3 and ZED1/ZRK5) (PubMed:20368970, PubMed:26355215, PubMed:28288096, PubMed:30948527, PubMed:30948526, PubMed:28652264). Confers allele-specific recognition and virulence attenuation of HopZ1a (PubMed:20368970). Immunity mediated by RPP13L4/ZAR1 is independent of several genes required by other resistance protein signaling pathways such as NDR1 and RAR1 (PubMed:20368970). Together with ZED1/ZRK5, involved in the regulation of the ambient temperature-sensitive intersection of growth and immune response in the absence of pathogens (PubMed:28499073). Exhibits autoinhibition activity. Interacts with ZED1/ZRK5 (PubMed:24170858). Component of a stable high-order oligomeric complex made of RKS1 and RPP13L4/ZAR1 which recruits ZED1-related kinases (e.g. uridylylated PBL2 and acetylated ZED1/ZRK5) in the presence of ATP and pathogenic bacteria type III secreted effector (T3SE) proteins (e.g. Pseudomonas syringae HopZ1a and HopF2a and Xanthomonas campestris pv. campestris (Xcc) XopAC/AvrAC) to form a wheel-like pentameric resistosome; this complex triggers immunity toward pathogenic bacteria (e.g. X.campestris and P.syringae), especially in vascular tissues (PubMed:26355215, PubMed:30948527, PubMed:30948526). Interacts with RKS1, ZED1/ZRK5, ZRK3, ZRK6 and ZRK15 (PubMed:26355215, PubMed:30948526, PubMed:28652264). Associates with the plasma membrane in the presence of the Xanthomonas campestris effector XopAC/AvrAC. N-terminal amphipathic alpha helix form a funnel-shaped structure that is required for the plasma membrane association of the resistosome complex, cell death triggering, and disease resistance. Increased sensitivity to the pathogenic biotrophic bacteria Xanthomonas campestris pv. campestris (Xcc) (PubMed:26355215, PubMed:30948527). Reduced resistance to Pseudomonas syringae expressing HopZ1a (PubMed:26355215, PubMed:28288096). Belongs to the disease resistance NB-LRR family. RPP13 subfamily. Extended N-terminus. Functional and comparative genomics of disease resistance gene homologs