6j6i | pdb_00006j6i
Reconstitution and structure of a plant NLR resistosome conferring immunity
Structural highlights
Function[PBL2_ARATH] Involved in disease resistance signaling (PubMed:20413097, PubMed:23951354). Contributes to pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) signaling and defense responses downstream of FLS2 (PubMed:20413097). Required for the bacterial XopAC/AvrAC effector-triggered immunity (ETI) against Xanthomonas campestris (PubMed:23951354).[1] [2] [R13L4_ARATH] CC-NB-LRR receptor-like protein required for recognition of the Pseudomonas syringae type III effector HopZ1a. Confers allele-specific recognition and virulence attenuation of HopZ1a. Immunity mediated by ZAR1 is independent of several genes required by other resistance protein signaling pathways such as NDR1 and RAR1.[3] Publication Abstract from PubMedNucleotide-binding, leucine-rich repeat receptors (NLRs) perceive pathogen effectors to trigger plant immunity. Biochemical mechanisms underlying plant NLR activation have until now remained poorly understood. We reconstituted an active complex containing the Arabidopsis coiled-coil NLR ZAR1, the pseudokinase RKS1, uridylated protein kinase PBL2, and 2'-deoxyadenosine 5'-triphosphate (dATP), demonstrating the oligomerization of the complex during immune activation. The cryo-electron microscopy structure reveals a wheel-like pentameric ZAR1 resistosome. Besides the nucleotide-binding domain, the coiled-coil domain of ZAR1 also contributes to resistosome pentamerization by forming an alpha-helical barrel that interacts with the leucine-rich repeat and winged-helix domains. Structural remodeling and fold switching during activation release the very N-terminal amphipathic alpha helix of ZAR1 to form a funnel-shaped structure that is required for the plasma membrane association, cell death triggering, and disease resistance, offering clues to the biochemical function of a plant resistosome. Reconstitution and structure of a plant NLR resistosome conferring immunity.,Wang J, Hu M, Wang J, Qi J, Han Z, Wang G, Qi Y, Wang HW, Zhou JM, Chai J Science. 2019 Apr 5;364(6435). pii: 364/6435/eaav5870. doi:, 10.1126/science.aav5870. PMID:30948527[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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