Phase separation of the redox sensor RCD1 mediates differential ROS signals to regulate plant growth and stress responses.
Xing J, Li K, Duan W, Duan Z, Zhang Y
Plant Signaling
PubMedUnderstanding how plants decide when to grow versus when to fight stress could lead to crops that are both more productive and more resilient to drought, disease, and climate extremes — meaning more reliable food on your table.
Plants constantly face a dilemma: should they focus energy on growing, or should they hunker down and defend against threats like drought or disease? This study found that a special protein acts like a molecular referee, physically changing its shape depending on how much 'oxidative stress' the plant detects. When stress is low, the protein teams up with a partner that promotes healthy leaf growth; when stress spikes, it switches partners and activates the plant's defense system instead.
Key Findings
The protein RCD1 undergoes liquid-liquid phase separation — physically condensing into droplets — in response to reactive oxygen species (ROS), switching between two distinct states.
Three specific cysteine building blocks within RCD1 are the molecular triggers that control whether it forms condensate droplets or remains dispersed in the cell.
The condensate vs. non-condensate state of RCD1 determines which transcription factor it binds: AS1 (promoting leaf development) during normal growth, or ZAT12 (activating stress genes) during stress.
chevron_right Technical Summary
Scientists discovered that a plant protein called RCD1 acts like a molecular switch, clumping together or dispersing in response to different levels of reactive oxygen species (ROS) to tell the plant whether to grow normally or activate stress defenses.
Abstract Preview
Reactive oxygen species (ROS) function as essential signaling molecules regulating diverse processes in plants. However, the mechanisms by which plants accurately perceive and distinguish between p...
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