MEDIATOR25 integrates jasmonate signaling with specialized metabolism across alkaloid and flavonoid pathways.
Singleton JJ, Schluttenhofer C, Patra B, Singh SK, Wu X
Plant Signaling
Madagascar periwinkle produces compounds used in childhood leukemia drugs, and understanding the molecular switches that control their production could help scientists grow more medicine in plants — or even engineer garden flowers to make more of the health-promoting flavonoids found in the foods we eat.
Plants are natural chemical factories, producing everything from the colors in flower petals to compounds that become life-saving medicines. Scientists found a single protein that acts like a master switch, connecting a plant's internal alarm system — triggered by damage or stress — to the machinery that makes these valuable chemicals. When they turned this switch off in the periwinkle plant, the plant made far fewer medicinal compounds, proving this protein is essential for the whole production line.
Key Findings
Silencing the MED25 gene in Madagascar periwinkle hairy roots significantly reduced accumulation of terpenoid indole alkaloids, which are precursors to anticancer drugs like vincristine and vinblastine.
MED25 physically binds to multiple transcription factor proteins — including MYC2 and JAZ1 in periwinkle, and GL3, MYB12, and MYB111 in Arabidopsis — acting as a molecular bridge between jasmonate stress signaling and compound production.
The regulatory role of MED25 is conserved across evolutionarily distant plant species: both Madagascar periwinkle and Arabidopsis showed suppressed flavonoid pathway gene expression when MED25 was lost or silenced.
chevron_right Technical Summary
Scientists identified a protein called MED25 that acts as a central hub connecting a plant's stress hormone system to the production of valuable compounds like medicinal alkaloids and colorful flavonoids. Disabling this protein in Madagascar periwinkle reduced the plant's ability to make cancer-drug precursors, revealing MED25 as a conserved regulator of specialized plant chemistry.
Abstract Preview
MEDIATOR 25 (MED25) is a key component of the universally conserved multi-subunit mediator complex. In plants, MED25 regulates diverse biological processes, including flowering, seed germination, c...
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