Plant receptor reads broken cell wall bits as an attack alarm
Jiménez-Sandoval P, Kentish O, Broyart C, Lee HK, Culjak K
Plant Signaling
Every time a fungus or bacterium chews through a plant's cell wall in your garden, that plant has a built-in sensor reading the wreckage and triggering its own defense response, and understanding that sensor could lead to crops and ornamentals that fight off disease on their own.
Plants have a protective wall around their cells, and when disease-causing germs break it down, tiny sugar fragments spill out. Researchers found a receptor protein called IGP1 that acts like a lock perfectly shaped to grab one of these sugar fragments, cellotriose, and use it as proof that an attack is underway. Once it grabs that piece, the plant can ramp up its immune defenses fast.
Key Findings
Researchers solved the 3D structure of the IGP1 receptor both empty and bound to cellotriose, a cellulose-derived sugar fragment released when cell walls are damaged.
The receptor's leucine-rich repeat and malectin domains are pre-arranged (constitutively interacting) even before binding, priming it to detect damage signals quickly.
A highly specific sugar-binding pocket in the LRR domain can distinguish subtle structural differences between glycans, allowing precise recognition of cell-wall damage cues.
chevron_right Technical Summary
Scientists discovered how a plant receptor detects fragments of its own damaged cell walls to sound an immune alarm. This molecular 'smoke detector' lets plants sense pathogen attack early and mount faster defenses.
Abstract Preview
Original paper
Glycan recognition by a plant damage-sensing immune receptor.
Pathogens target and degrade the extracellular matrix surrounding plant cells. A central question is how cell wall-derived damage-associated molecular patterns (DAMPs) are recognized and integrated...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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