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- W2098344524 abstract "We identify four novel DNA-binding complexes in the nuclear-encoded Lhcb1 promoter of the chlorophyte alga Dunaliella tertiolecta that are regulated by photosynthetic pathways in the plastid. The binding activities of three of the complexes were positively correlated with time-dependent changes in Lhcb1 transcript abundance, implicating their roles as transcriptional enhancers in a retrograde signal transduction pathway. Using a combination of inhibitors, uncouplers, and antimycin A, and by following the kinetic pattern of gene regulation, we infer two different sensors in the signal transduction pathway. On short time scales of 0.5 to about 4 h, the transthylakoid membrane potential appears to be a critical determinant of gene expression, whereas on time scales of 8 h or longer, the redox state of the plastoquinone pool becomes increasingly more important. The differentiation of these two types of signals was observed in parallel effects on gene transcription and on the patterns of DNA-binding activities in the Lhcb1 promoter. These signals appear to be transduced at the nuclear level via a coordinated ensemble of DNA-binding complexes located between -367 and -188 bp from the start codon of the gene. The regulation of these elements allows the cell to up- or down-regulate the expression on Lhcb1 in response to changes in irradiance." @default.
- W2098344524 created "2016-06-24" @default.
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- W2098344524 date "2004-11-01" @default.
- W2098344524 modified "2023-10-14" @default.
- W2098344524 title "Plastid Regulation of <i>Lhcb1</i> Transcription in the Chlorophyte Alga <i>Dunaliella tertiolecta</i>" @default.
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- W2098344524 doi "https://doi.org/10.1104/pp.104.038919" @default.
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