F-Box Protein-Mediated Proteolytic Regulation of Phenylpropanoid Metabolism in Response to Biotic and Abiotic Stresses.
Yang G, Liu CJ
Plant Signaling
Same chemical pathways that help a plant fend off a fungal attack also produce the antioxidants in your blueberries and the structural fiber in your wooden furniture — and learning to tune these switches could mean crops that protect themselves without pesticides.
Plants produce a vast toolkit of protective and structural chemicals — the stuff that makes wood hard, wine red, and herbs fragrant. A family of molecular 'off switches' called F-box proteins grabs the enzymes responsible for making these chemicals and marks them for destruction, letting the plant quickly adjust production up or down. Scientists are now mapping exactly which switches control which chemicals and when they flip, opening doors to engineering plants that are tougher, healthier, or better as fuel sources.
Key Findings
F-box proteins directly target at least 6 key enzymes across lignin and flavonoid biosynthesis pathways — including PAL, CCR, CAD, COMT, peroxidases, and CHS — marking them for selective degradation.
These molecular switches respond to multiple distinct environmental signals simultaneously: cellular carbon availability, light quality and intensity, and attacks by pathogens or insects.
Manipulating F-box protein activity presents concrete biotech opportunities in three areas: boosting medicinal phenolic compounds, improving biofuel crop feedstocks, and engineering broader stress tolerance in food crops.
chevron_right Technical Summary
Plants build their chemical armor — from woody cell walls to antioxidant pigments — using assembly-line enzymes. This review reveals that specialized molecular tags called F-box proteins act as 'off switches' for those enzymes, controlling when plants ramp up or dial down their chemical defenses in response to pests, pathogens, and changing light.
Abstract Preview
Protein ubiquitination is a central regulatory mechanism governing plant growth, development and environmental adaptation. Ubiquitylomic studies have revealed that many enzymes in phenylpropanoid b...
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