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Structural and functional analysis of a plant resistance protein TIR domain reveals interfaces for self-association, signaling, and autoregulation.

Identifieur interne : 000106 ( Main/Exploration ); précédent : 000105; suivant : 000107

Structural and functional analysis of a plant resistance protein TIR domain reveals interfaces for self-association, signaling, and autoregulation.

Auteurs : Maud Bernoux [Australie] ; Thomas Ve [Australie] ; Simon Williams [Australie] ; Christopher Warren [Australie] ; Danny Hatters [Australie] ; Eugene Valkov [Australie] ; Xiaoxiao Zhang [Australie] ; Jeffrey G. Ellis [Australie] ; Bostjan Kobe [Australie] ; Peter N. Dodds [Australie]

Source :

RBID : pubmed:21402359

Descripteurs français

English descriptors

Abstract

The Toll/interleukin-1 receptor (TIR) domain occurs in animal and plant immune receptors. In the animal Toll-like receptors, homodimerization of the intracellular TIR domain is required for initiation of signaling cascades leading to innate immunity. By contrast, the role of the TIR domain in cytoplasmic nucleotide-binding/leucine-rich repeat (NB-LRR) plant immune resistance proteins is poorly understood. L6 is a TIR-NB-LRR resistance protein from flax (Linum usitatissimum) that confers resistance to the flax rust phytopathogenic fungus (Melampsora lini). We determine the crystal structure of the L6 TIR domain and show that, although dispensable for pathogenic effector protein recognition, the TIR domain alone is both necessary and sufficient for L6 immune signaling. We demonstrate that the L6 TIR domain self-associates, most likely forming a homodimer. Analysis of the structure combined with site-directed mutagenesis suggests that self-association is a requirement for immune signaling and reveals distinct surface regions involved in self-association, signaling, and autoregulation.

DOI: 10.1016/j.chom.2011.02.009
PubMed: 21402359
PubMed Central: PMC3142617


Affiliations:


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Le document en format XML

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<term>Amino Acid Sequence (MeSH)</term>
<term>Basidiomycota (MeSH)</term>
<term>Binding Sites (MeSH)</term>
<term>Computer Simulation (MeSH)</term>
<term>Crystallography, X-Ray (MeSH)</term>
<term>Flax (immunology)</term>
<term>Flax (microbiology)</term>
<term>Homeostasis (MeSH)</term>
<term>Models, Molecular (MeSH)</term>
<term>Molecular Sequence Data (MeSH)</term>
<term>Mutagenesis, Site-Directed (MeSH)</term>
<term>Plant Diseases (immunology)</term>
<term>Plant Proteins (chemistry)</term>
<term>Plant Proteins (genetics)</term>
<term>Protein Interaction Domains and Motifs (MeSH)</term>
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<term>Protein Structure, Secondary (MeSH)</term>
<term>Recombinant Fusion Proteins (chemistry)</term>
<term>Recombinant Fusion Proteins (genetics)</term>
<term>Sequence Alignment (MeSH)</term>
<term>Signal Transduction (MeSH)</term>
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<term>Alignement de séquences (MeSH)</term>
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<term>Cristallographie aux rayons X (MeSH)</term>
<term>Données de séquences moléculaires (MeSH)</term>
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<term>Lin (microbiologie)</term>
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<term>Modèles moléculaires (MeSH)</term>
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<term>Protéines végétales (génétique)</term>
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<term>Sites de fixation (MeSH)</term>
<term>Structure quaternaire des protéines (MeSH)</term>
<term>Structure secondaire des protéines (MeSH)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Transduction du signal (MeSH)</term>
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<term>Recombinant Fusion Proteins</term>
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<term>Plant Diseases</term>
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<term>Lin</term>
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<term>Signal Transduction</term>
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<term>Structure quaternaire des protéines</term>
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<div type="abstract" xml:lang="en">The Toll/interleukin-1 receptor (TIR) domain occurs in animal and plant immune receptors. In the animal Toll-like receptors, homodimerization of the intracellular TIR domain is required for initiation of signaling cascades leading to innate immunity. By contrast, the role of the TIR domain in cytoplasmic nucleotide-binding/leucine-rich repeat (NB-LRR) plant immune resistance proteins is poorly understood. L6 is a TIR-NB-LRR resistance protein from flax (Linum usitatissimum) that confers resistance to the flax rust phytopathogenic fungus (Melampsora lini). We determine the crystal structure of the L6 TIR domain and show that, although dispensable for pathogenic effector protein recognition, the TIR domain alone is both necessary and sufficient for L6 immune signaling. We demonstrate that the L6 TIR domain self-associates, most likely forming a homodimer. Analysis of the structure combined with site-directed mutagenesis suggests that self-association is a requirement for immune signaling and reveals distinct surface regions involved in self-association, signaling, and autoregulation.</div>
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<AbstractText>The Toll/interleukin-1 receptor (TIR) domain occurs in animal and plant immune receptors. In the animal Toll-like receptors, homodimerization of the intracellular TIR domain is required for initiation of signaling cascades leading to innate immunity. By contrast, the role of the TIR domain in cytoplasmic nucleotide-binding/leucine-rich repeat (NB-LRR) plant immune resistance proteins is poorly understood. L6 is a TIR-NB-LRR resistance protein from flax (Linum usitatissimum) that confers resistance to the flax rust phytopathogenic fungus (Melampsora lini). We determine the crystal structure of the L6 TIR domain and show that, although dispensable for pathogenic effector protein recognition, the TIR domain alone is both necessary and sufficient for L6 immune signaling. We demonstrate that the L6 TIR domain self-associates, most likely forming a homodimer. Analysis of the structure combined with site-directed mutagenesis suggests that self-association is a requirement for immune signaling and reveals distinct surface regions involved in self-association, signaling, and autoregulation.</AbstractText>
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