Journal
SCIENCE
Volume 318, Issue 5854, Pages 1302-1305Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1146281
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Funding
- NIGMS NIH HHS [R01 GM77582-01, R01 GM077582, R01 GM077582-01A1] Funding Source: Medline
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Plants use light to optimize growth and development. The photoreceptor phytochrome A ( phyA) mediates various far-red light-induced responses. We show that Arabidopsis FHY3 and FAR1, which encode two proteins related to Mutator-like transposases, act together to modulate phyA signaling by directly activating the transcription of FHY1 and FHL, whose products are essential for light-induced phyA nuclear accumulation and subsequent light responses. FHY3 and FAR1 have separable DNA binding and transcriptional activation domains that are highly conserved in Mutator-like transposases. Further, expression of FHY3 and FAR1 is negatively regulated by phyA signaling. We propose that FHY3 and FAR1 represent transcription factors that have been co-opted from an ancient Mutator-like transposase(s) to modulate phyA-signaling homeostasis in higher plants.
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