LRR receptor-like serine/threonine-protein kinase FLS2 - Q9FL28 (FLS2_ARATH)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9FL28: 2
Constitutes the pattern-recognition receptor (PPR) that determines the specific perception of flagellin (flg22), a potent elicitor of the defense response to pathogen-associated molecular patterns (PAMPs). Flagellin-binding to the receptor is the first step to initiate the innate immune MAP kinase signaling cascade (MEKK1, MKK4/MKK5 and MPK3/MPK6), resulting in enhanced resistance against pathogens. Binding to the effector AvrPto1 or to the phosphatase hopD2 from Pseudomonas syringae blocks the downstream plant immune response. UniProt
Catalytic Activity
ATP + a protein = ADP + a phosphoprotein. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Heterodimer with BAK1 (PubMed:24114786). Interacts with KAPP. Interacts with BAK1. Does not form homodimer. Interacts with SERK3/BAK1, SERK4/BKK1, SERK1 and SERK2 in a specific ligand-induced manner. Interacts with P.syringae AvrPto1, AvrPtoB and (via the kinase and cytoplasmic domains) hopD2. Component of large complexes containing, at least, FLS2 and ACD6 in endoplasmic reticulum and plasma membrane (PubMed:24923602). Interacts with MORC1/CRT1 (PubMed:23250427). Interacts with PBS1, BIK1, PBL1 and PBL2 (PubMed:20413097). Interacts with RBOHD (PubMed:24629339). Binds to IOS1 which triggers FLS2-BAK1 complex formation upon microbe-associated molecular patterns (MAMPs) treatment (PubMed:27317676). Interacts with PCRK1 AND PCRK2 (PubMed:27208222). Interacts with BSK1 (PubMed:23532072). Interaction with BSK8 (PubMed:21726371). UniProt
Both extracellular leucine-rich repeats and protein kinase domains are required for flg22-binding. The LRR 9 to LRR 15 domains are involved in flg22-binding. UniProt
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