Cyclophilin A-mediated cis/trans isomerization modulates RIN4 to control intracellular rhizobial infection in legumes.
Goto T, Andersen KR, Bamba M, Sato S, Sugawara M
Plant Signaling
Every bag of dry lentils, every snap pea clinging to your trellis, every patch of clover feeding your lawn's soil owes its nitrogen to a tiny bacterial negotiation inside root cells — and this study just cracked open how plants let the right bacteria in without fighting them off.
Legume plants like soybeans and garden beans form partnerships with soil bacteria that pull nitrogen from the air and feed it to the plant. For this to work, the plant has to let the bacteria inside its roots without attacking them like an invader. Researchers found a protein that flips a switch on another immune-system protein, essentially telling the plant's defenses to stand down just enough for the good bacteria to move in.
Key Findings
A protein called CyPA physically reshapes a key immune regulator (RIN4) between two forms — one form lets rhizobial bacteria enter root cells, the other blocks them.
Knocking out LjCyPA1 using CRISPR gene editing in Lotus japonicus disrupted normal bacterial infection threads, confirming the protein is essential for symbiosis.
A naturally occurring gain-of-function variant of LjCyPA1 found in a soybean cultivar allowed the plant to form partnerships with both compatible and normally incompatible rhizobial strains, hinting at a path toward engineering broader symbiotic flexibility.
chevron_right Technical Summary
Scientists discovered that a molecular switch inside legume plants helps them accept beneficial soil bacteria (rhizobia) without triggering an immune rejection — a balancing act that makes nitrogen-fixing root nodules possible.
Abstract Preview
In most legume-rhizobium symbioses, rhizobial colonization occurs through host-derived intracellular infection threads, which enable rhizobial recruitment while presumably modulating the host immun...
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