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Light regulated modulation of Z-box containing promoters by photoreceptors and downstream regulatory components,COP1 and HY5, in Arabidopsis 总被引:6,自引:0,他引:6
Yadav V Kundu S Chattopadhyay D Negi P Wei N Deng XW Chattopadhyay S 《The Plant journal : for cell and molecular biology》2002,31(6):741-753
The Z-box is one of the light-responsive elements (LREs) found in the promoters of light inducible genes. We have studied the light responsive characteristics of Z-box containing synthetic as well as native promoters. We show that promoters with Z-box as a single LRE or paired with another LRE can respond to a broad spectrum of light. The response is primarily mediated by phyA, phyB and CRY1 photoreceptors at their respective wavelengths of light. We have demonstrated that CAB1 and Z-GATA containing promoters are down-regulated in hy5 mutants in the light. On the other hand, a promoter with Z-box alone is down-regulated in hy5 mutants both in dark and in light conditions, suggesting involvement of a similar regulatory system in the regulation of the promoter in two distinct developmental pathways: skotomorphogenesis and photomorphogenesis. Furthermore, similar to the CAB1 promoter, a Z-GATA containing promoter is derepressed in cop1 mutants in the dark. DNA-protein interaction studies reveal the presence of a DNA-binding activity that is specific to Z-box. These results provide insights into the regulation of the Z-box LRE mediated by various light signaling components. 相似文献
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Functional interrelation of MYC2 and HY5 plays an important role in Arabidopsis seedling development
Moumita Chakraborty Sreeramaiah N. Gangappa Jay P. Maurya Vishmita Sethi Archana K. Srivastava Aparna Singh Siddhartha Dutta Madhusmita Ojha Nisha Gupta Mandar Sengupta Hasthi Ram Sudip Chattopadhyay 《The Plant journal : for cell and molecular biology》2019,99(6):1080-1097
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MYC2 differentially modulates diverse jasmonate-dependent functions in Arabidopsis 总被引:11,自引:0,他引:11
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Dombrecht B Xue GP Sprague SJ Kirkegaard JA Ross JJ Reid JB Fitt GP Sewelam N Schenk PM Manners JM Kazan K 《The Plant cell》2007,19(7):2225-2245
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PIF4, a phytochrome-interacting bHLH factor,functions as a negative regulator of phytochrome B signaling in Arabidopsis 总被引:17,自引:0,他引:17
Plants sense and respond to red and far-red light using the phytochrome (phy) family of photoreceptors. However, the mechanism of light signal transduction is not well defined. Here, we report the identification of a new mutant Arabidopsis locus, srl2 (short under red-light 2), which confers selective hypersensitivity to continuous red, but not far-red, light. This hypersensitivity is eliminated in srl2phyB, but not srl2phyA, double mutants, indicating that this locus functions selectively and negatively in phyB signaling. The SRL2 gene encodes a bHLH factor, designated PIF4 (phytochrome-interacting factor 4), which binds selectively to the biologically active Pfr form of phyB, but has little affinity for phyA. Despite its hypersensitive morphological phenotype, the srl2 mutant displays no perturbation of light-induced expression of marker genes for chloroplast development. These data suggest that PIF4 may function specifically in a branch of the phyB signaling network that regulates a subset of genes involved in cell expansion. Consistent with this proposal, PIF4 localizes to the nucleus and can bind to a G-box DNA sequence motif found in various light-regulated promoters. 相似文献