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    Autoimmunity and effector recognition in Arabidopsis thaliana can be uncoupled by mutations in the RRS1-R immune receptor

    75266.pdf (1.461Mb)
    Access Status
    Open access
    Authors
    Newman, Toby
    Lee, J.
    Williams, S.
    Choi, S.
    Halane, M.
    Zhou, J.
    Solomon, P.
    Kobe, B.
    Jones, J.
    Segonzac, C.
    Sohn, K.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Newman, T.E. and Lee, J. and Williams, S.J. and Choi, S. and Halane, M.K. and Zhou, J. and Solomon, P. et al. 2019. Autoimmunity and effector recognition in Arabidopsis thaliana can be uncoupled by mutations in the RRS1-R immune receptor. New Phytologist. 222 2): pp. 954-965.
    Source Title
    New Phytologist
    DOI
    10.1111/nph.15617
    ISSN
    0028-646X
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Remarks

    This is the peer reviewed version of the article cited above, which has been published in final form at https://doi.org/10.1111/nph.15617. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

    URI
    http://hdl.handle.net/20.500.11937/75018
    Collection
    • Curtin Research Publications
    Abstract

    Plant nucleotide-binding leucine-rich repeat (NLR) disease resistance proteins recognize specific pathogen effectors and activate a cellular defense program. In Arabidopsis thaliana (Arabidopsis) Resistance to Ralstonia solanacearum 1 (RRS1-R) and Resistance to Pseudomonas syringae 4 (RPS4) function together to recognize the unrelated bacterial effectors PopP2 and AvrRps4. In the plant cell nucleus, the RRS1-R/RPS4 complex binds to and signals the presence of AvrRps4 or PopP2. The exact mechanism underlying NLR signaling and immunity activation remains to be elucidated. Using genetic and biochemical approaches we characterized the intragenic suppressors of sensitive to low humidity 1 (slh1), a temperature-sensitive auto-immune allele of RRS1-R. Our analyses identified 5 amino acid residues that contribute to RRS1-RSLH1 auto-activity. We investigated the role of these residues in the RRS1-R allele by genetic complementation and found that C15 in the TIR domain and L816 in the LRR domain were also important for effector recognition. Further characterization of the intragenic suppressive mutations located in the RRS1-R TIR domain revealed differing requirements for RRS1-R/RPS4-dependent autoimmunity and effector-triggered immunity. Our results provide novel information about the mechanisms that, in turn, hold an NLR protein complex inactive and allow adequate activation in the presence of pathogens. This article is protected by copyright. All rights reserved.

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