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Identification of Post-translational Modifications of Plant Protein Complexes
Published on: February 22, 2014
Pattern recognition receptors require N-glycosylation to mediate plant immunity
Heidrun Häweker1, Stephan Rips, Hisashi Koiwa
1Max-Planck-Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Cologne, Germany.
The Journal of Biological Chemistry
|December 17, 2009
Summary
N-glycans on plant immune receptors are crucial for pathogen recognition. A single N-glycan site on EFR is vital for its abundance, ligand binding, and immune signaling, impacting plant defense against pathogens.
Area of Science:
- Plant immunology
- Molecular plant pathology
- Glycobiology
Background:
- N-glycans on plasma membrane receptors are key interaction sites with pathogens.
- Understanding N-glycan roles in plant immune receptor function is essential.
Purpose of the Study:
- To investigate the role of N-glycans in the function of Arabidopsis immune receptors EFR and FLS2.
- To determine the impact of N-glycosylation defects on receptor-mediated immunity.
Main Methods:
- Analysis of EFR and FLS2 function in N-glycosylation mutants.
- Ligand binding assays and measurement of immune responses (e.g., oxidative burst).
- Site-directed mutagenesis to remove specific N-glycosylation sites.
Main Results:
- Both EFR and FLS2 tolerated some N-glycan modifications.
- EFR function was specifically impaired by mutations in STT3A, affecting N-glycan synthesis.
- Loss of a single N-glycan site on EFR (EFR(N143Q)) reduced its abundance, ligand binding, and signaling.
Conclusions:
- N-glycans are critical for optimal EFR abundance and ligand recognition.
- A single N-glycan site can play a vital role in plant immune receptor function.
- These findings highlight the importance of glycosylation in plant-pathogen interactions.
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