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Identification of Post-translational Modifications of Plant Protein Complexes
Published on: February 22, 2014
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Structural basis for assembly and function of a heterodimeric plant immune receptor
Simon J Williams1, Kee Hoon Sohn, Li Wan
1School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, QLD 4072, Australia.
Science (New York, N.Y.)
|April 19, 2014
Summary
Plant immune receptors RPS4 and RRS1 physically associate to form a functional complex. This receptor complex is essential for plant defense against pathogens, with distinct roles in recognition and signaling.
Area of Science:
- Plant immunity
- Molecular mechanisms of plant defense
- Structural biology of immune receptors
Background:
- Cytoplasmic plant immune receptors detect pathogen effectors to trigger defense.
- RPS4 and RRS1 are essential Arabidopsis immune receptors for defense against multiple pathogens.
Purpose of the Study:
- To investigate the physical association and functional interaction of RPS4 and RRS1.
- To elucidate the structural basis of RPS4-RRS1 complex formation and function.
Main Methods:
- Co-immunoprecipitation to show physical association of RPS4 and RRS1.
- X-ray crystallography to determine the structures of RPS4 and RRS1 TIR domains.
- Analysis of TIR domain heterodimerization interface and its role in defense signaling.
Main Results:
- RPS4 and RRS1 physically associate and form a heterodimeric complex.
- Crystal structures reveal a conserved TIR/TIR interaction interface critical for complex formation.
- TIR domain heterodimerization is required for a functional effector recognition complex.
- RPS4 TIR domain mediates effector-independent defense, while RRS1 TIR domain inhibits it via the heterodimerization interface.
Conclusions:
- RPS4 and RRS1 function as a crucial receptor complex in plant immunity.
- Distinct roles of RPS4 and RRS1 within the complex are defined by their interaction interface.
- Structural insights into TIR domain heterodimerization provide a basis for understanding plant immune receptor function.
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