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Pattern-Triggered Oxidative Burst and Seedling Growth Inhibition Assays in Arabidopsis thaliana

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Published on: May 21, 2019

Chitin-induced dimerization activates a plant immune receptor.

Tingting Liu¹, Zixu Liu, Chuanjun Song

¹Graduate Program in Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.

Science (New York, N.Y.)

|June 2, 2012

Summary

Plant immune receptor chitin elicitor receptor kinase 1 (AtCERK1) activation requires dimerization. Chitin binding induces AtCERK1 dimerization, a crucial step for plant defense signaling against pathogens.

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Area of Science:

Plant immunity
Molecular biology
Structural biology

Background:

Pattern recognition receptors (PRRs) are crucial for plant defense against pathogens.
Chitin elicitor receptor kinase 1 (AtCERK1) is a plant cell surface receptor that recognizes chitin, a component of fungal pathogen cell walls.
AtCERK1 activation initiates plant immune responses.

Purpose of the Study:

To elucidate the molecular mechanism of AtCERK1 activation by chitin.
To investigate the role of AtCERK1 dimerization in plant immune signaling.

Main Methods:

Crystal structure determination of AtCERK1 ectodomain (AtCERK1-ECD) complexed with chitin.
Biochemical assays to study chitin-induced AtCERK1 dimerization.
Genetic analysis of AtCERK1 signaling mutants.

Main Results:

The crystal structure revealed direct binding between AtCERK1-ECD and chitin, mediated by LysM domains and chitin residues.
Chitin octamers induce AtCERK1-ECD dimerization, while shorter oligomers do not.
Mutations affecting AtCERK1 dimerization or overexpression of AtCERK1-ECD impaired AtCERK1-mediated signaling.

Conclusions:

Chitin-induced dimerization of AtCERK1 is essential for its activation and subsequent plant immune signaling.
Structural and functional data highlight dimerization as a critical step in AtCERK1-mediated plant defense.