The RECEPTOR‐LIKE PROTEIN53 immune complex associates with LLG1 to positively regulate plant immunity. Issue 9 (18th August 2022)

• Record Type: Journal Article
• Authors: Chen, Renjie; Sun, Pengwei; Zhong, Guitao; Wang, Wei; Tang, Dingzhong
• Is Part Of: Journal of integrative plant biology. Volume 64:Issue 9(2022)
• Page Start: 1833
• Page End: 1846
• Publication Date: 2022-08-18
• Subjects: BAK1 -- EDR1 -- LLG1 -- plant immunity -- RLP53 -- SOBIR1; Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.13327
• Languages: English
• ISSNs: 1672-9072

Abstract

Abstract: Pattern recognition receptors (PRRs) sense ligands in pattern‐triggered immunity (PTI). Plant PRRs include numerous receptor‐like proteins (RLPs), but many RLPs remain functionally uncharacterized. Here, we examine an Arabidopsis thaliana RLP, RLP53, which positively regulates immune signaling. Our forward genetic screen for suppressors of enhanced disease resistance1 ( edr1 ) identified a point mutation in RLP53 that fully suppresses disease resistance and mildew‐induced cell death in edr1 mutants. The rlp53 mutants showed enhanced susceptibility to virulent pathogens, including fungi, oomycetes, and bacteria, indicating that RLP53 is important for plant immunity. The ectodomain of RLP53 contains leucine‐rich repeat (LRR) motifs. RLP53 constitutively associates with the LRR receptor‐like kinase SUPPRESSOR OF BRASSINOSTEROID INSENSITIVE1‐ASSOCIATED KINASE (BAK1)‐INTERACTING RECEPTOR KINASE1 (SOBIR1) and interacts with the co‐receptor BAK1 in a pathogen‐induced manner. The double mutation sobir1‐12 bak1‐5 suppresses edr1 ‐mediated disease resistance, suggesting that EDR1 negatively regulates PTI modulated by the RLP53–SOBIR1–BAK1 complex. Moreover, the glycosylphosphatidylinositol (GPI)‐anchored protein LORELEI‐LIKE GPI‐ANCHORED PROTEIN1 (LLG1) interacts with RLP53 and mediates RLP53 accumulation in the plasma membrane. We thus uncovered the role of a novel RLP and its associated immune complex in plant defense responses and revealed a potential new mechanism underlying regulation of RLP immune function by a GPI‐anchored protein. Abstract : A screen for enhanced disease resistance1 ( edr1 ) suppressors identified the receptor‐like protein RLP53, which interacts with two coreceptors to positively regulate plant immune responses against multiple pathogens. The edr1 suppressor screen also identified LORELEI‐LIKE GPI‐ANCHORED PROTEIN1, which mediates RLP53 accumulation in the plasma membrane.