A disguised plant immune receptor lures pathogen effector
1Crop Disease Resistance Team, Yazhouwan National Laboratory, Sanya, 572024 Hainan, China.
Cell Host & Microbe
|August 12, 2026
Summary
Plants utilize nucleotide-binding/leucine-rich-repeat receptors (NLRs) to detect pathogen effectors. A new study shows MLA3 mimics a host target to recognize effectors, guiding NLR engineering for disease resistance.
Area of Science:
- Plant immunity
- Molecular biology
- Structural biology
Background:
- Plants possess nucleotide-binding/leucine-rich-repeat receptors (NLRs) crucial for detecting pathogen effectors.
- Understanding NLR activation mechanisms is key to enhancing plant disease resistance.
Purpose of the Study:
- To elucidate the molecular mechanism by which the MLA3 NLR receptor recognizes pathogen effectors.
- To explore alternative NLR activation principles beyond traditional models for engineering disease resistance.
Main Methods:
- Structural analysis of the MLA3 receptor and its interaction with pathogen effectors.
- Biochemical assays to validate recognition mechanisms.
Main Results:
- The MLA3 NLR receptor recognizes a pathogen effector by structurally mimicking a host virulence target interface.
- This recognition mechanism differs from the conventional guard/decoy model and NLR-integrated domain mechanisms.
Conclusions:
- Plant NLRs can evolve novel effector recognition strategies.
- The findings provide a mechanistic basis for engineering NLRs for broad-spectrum disease resistance.
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