Plants use a molecular ruler to spot fungal invaders
Plant Signaling
The legumes in your garden rely on this exact sensing system to decide when a fungus crossing its roots is a threat versus a helpful partner, and understanding it could lead to crops that fight disease without rejecting beneficial soil microbes.
Plant cells have tiny sensors on their surface that detect chitin, a tough material found in fungal walls and insect shells, so they know when to sound the immune alarm. This study used detailed 3D structures to show how one receptor acts like a ruler, grabbing only long chitin chains tightly while a helper receptor locks the alarm system into place. That precision matters because plants need to tell apart a dangerous fungal attack from the short chitin bits shed by friendly fungi living in their roots.
Key Findings
Identified a 'bridge domain' unique to CHIP-class receptors that enables high-affinity, size-selective binding to long-chain chitin oligomers in Lotus japonicus and Medicago truncatula
Used structural biology, biochemistry, and nanobody-based functional tests in plants to map the receptor-ligand binding mechanism
Showed CERK-class receptors act as low-affinity but essential co-receptors, forming a ligand-induced signaling complex with CHIP receptors to activate immunity
chevron_right Technical Summary
Scientists figured out exactly how plants like clover relatives tell the difference between short and long fragments of chitin, a molecule found in fungal cell walls and insect shells, allowing them to trigger immune defenses only when the threat signal is substantial.
Abstract Preview
Original paper
Structural basis for size-selective perception of chitin in plants
Plants detect microbes through pattern recognition receptors that perceive conserved microbial surface motifs known as microbe-associated molecular patterns (MAMPs). Lysin motif (LysM) receptors re...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Lotus japonicus is a wild legume that belongs to family Fabaceae. Members of this family are very diverse, constituting about 20,000 species. They are of significant agricultural and biological importance as many of the legume species are rich sources of protein and oil and can also fix atmospher...