scholarly journals Interactions of Two Transcriptional Repressors and Two Transcriptional Activators in Modulating Gibberellin Signaling in Aleurone Cells

2008 ◽  
Vol 148 (1) ◽  
pp. 176-186 ◽  
Author(s):  
Xiaolu Zou ◽  
Dawn Neuman ◽  
Qingxi J. Shen
Keyword(s):  
Transcriptional Activators ◽  
Transcriptional Repressors ◽  
Aleurone Cells ◽  
Gibberellin Signaling

scholarly journals A Rice WRKY Gene Encodes a Transcriptional Repressor of the Gibberellin Signaling Pathway in Aleurone Cells

2004 ◽  
Vol 134 (4) ◽  
pp. 1500-1513 ◽  
Author(s):  
Zhong-Lin Zhang ◽  
Zhen Xie ◽  
Xiaolu Zou ◽  
Jose Casaretto ◽  
Tuan-hua David Ho ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Transcriptional Repressor ◽  
Wrky Gene ◽  
Aleurone Cells ◽  
Gibberellin Signaling

scholarly journals Interactions of two abscisic-acid inducedWRKYgenes in repressing gibberellin signaling in aleurone cells

2006 ◽  
Vol 46 (2) ◽  
pp. 231-242 ◽  
Author(s):  
Zhen Xie ◽  
Zhong-Lin Zhang ◽  
Xiaolu Zou ◽  
Guangxiao Yang ◽  
Setsuko Komatsu ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Aleurone Cells ◽  
Gibberellin Signaling

scholarly journals Three WRKY transcription factors additively repress abscisic acid and gibberellin signaling in aleurone cells

Plant Science ◽  
2015 ◽  
Vol 236 ◽  
pp. 214-222 ◽  
Author(s):  
Liyuan Zhang ◽  
Lingkun Gu ◽  
Patricia Ringler ◽  
Stanley Smith ◽  
Paul J. Rushton ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Abscisic Acid ◽  
Wrky Transcription Factors ◽  
Aleurone Cells ◽  
Gibberellin Signaling

scholarly journals Gibberellin Signaling in Barley Aleurone Cells. Control of SLN1 and GAMYB Expression

2002 ◽  
Vol 129 (1) ◽  
pp. 191-200 ◽  
Author(s):  
Frank Gubler ◽  
Peter Michael Chandler ◽  
Rosemary G. White ◽  
Danny J. Llewellyn ◽  
John V. Jacobsen
Keyword(s):  
Aleurone Cells ◽  
Barley Aleurone ◽  
Gibberellin Signaling

scholarly journals Defense-Related Signaling by Interaction of Arabinogalactan Proteins and β-Glucosyl Yariv Reagent Inhibits Gibberellin Signaling in Barley Aleurone Cells

2008 ◽  
Vol 49 (2) ◽  
pp. 178-190 ◽  
Author(s):  
Kiyoshi Mashiguchi ◽  
Eriko Urakami ◽  
Morifumi Hasegawa ◽  
Kazutsuka Sanmiya ◽  
Ichiro Matsumoto ◽  
...  
Keyword(s):  
Arabinogalactan Proteins ◽  
Aleurone Cells ◽  
Yariv Reagent ◽  
Barley Aleurone ◽  
Gibberellin Signaling

scholarly journals Glucose Repression of STA1 Expression Is Mediated by the Nrg1 and Sfl1 Repressors and the Srb8-11 Complex

2004 ◽  
Vol 24 (17) ◽  
pp. 7695-7706 ◽  
Author(s):  
Tae Soo Kim ◽  
Sung Bae Lee ◽  
Hyen Sam Kang
Keyword(s):  
Glucose Repression ◽  
Transcriptional Activator ◽  
Specific Site ◽  
Transcriptional Activators ◽  
Transcriptional Repressors ◽  
Saccharomyces Diastaticus

ABSTRACT In the yeast Saccharomyces diastaticus, expression of the STA1 gene, which encodes an extracellular glucoamylase, is negatively regulated by glucose. Here we demonstrate that glucose-dependent repression of STA1 expression is imposed by both Sfl1 and Nrg1, which serve as direct transcriptional repressors. We show that Nrg1 acts only on UAS1, and Sfl1 acts only on UAS2, in the STA1 promoter. When bound to its specific site, Sfl1 (but not Nrg1) prevents the binding to UAS2 of two transcriptional activators, Ste12 and Tec1, required for STA1 expression. We also found that Sfl1 contributes to STA1 repression by binding to the promoter and inhibiting the expression of FLO8, a gene that encodes a third transcriptional activator involved in STA1 expression. In addition, we show that the levels of Nrg1 and Sfl1 increase in glucose-grown cells, suggesting that the effects of glucose are mediated, at least in part, through an increase in the abundance of these repressors. NRG1 and SFL1 expression requires the Srb8-11 complex, and correspondingly, the Srb8-11 complex is also necessary for STA1 repression. However, our evidence indicates that the Srb8-11 complex does not associate with either the SFL1 or the NRG1 promoter and thus plays an indirect role in activating NRG1 and SFL1 expression.

scholarly journals Properties of repression condensates in living Ciona embryos

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nicholas Treen ◽  
Shunsuke F. Shimobayashi ◽  
Jorine Eeftens ◽  
Clifford P. Brangwynne ◽  
Michael Levine
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Transcriptional Activators ◽  
Liquid Droplets ◽  
Transcriptional Repressors ◽  
Initiation Complex ◽  
Repressor Proteins ◽  
Liquid Behavior ◽  
Dna Template ◽  
Liquid Liquid Phase Separation

AbstractRecent studies suggest that transcriptional activators and components of the pre-initiation complex (PIC) form higher order associations—clusters or condensates—at active loci. Considerably less is known about the distribution of repressor proteins responsible for gene silencing. Here, we develop an expression assay in living Ciona embryos that captures the liquid behavior of individual nucleoli undergoing dynamic fusion events. The assay is used to visualize puncta of Hes repressors, along with the Groucho/TLE corepressor. We observe that Hes.a/Gro puncta have the properties of viscous liquid droplets that undergo limited fusion events due to association with DNA. Hes.a mutants that are unable to bind DNA display hallmarks of liquid–liquid phase separation, including dynamic fusions of individual condensates to produce large droplets. We propose that the DNA template serves as a scaffold for the formation of Hes condensates, but limits the spread of transcriptional repressors to unwanted regions of the genome.

scholarly journals The family feud: turning off Sp1 by Sp1-like KLF proteins

2005 ◽  
Vol 392 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Gwen Lomberk ◽  
Raul Urrutia
Keyword(s):  
Transcription Factors ◽  
Extended Family ◽  
Zinc Fingers ◽  
Dna Binding Domain ◽  
Transcriptional Activators ◽  
Transcriptional Repressors ◽  
Biological Functions ◽  
Cellular Processes ◽  
The Family ◽  
Number Of Genes

Sp1 is one of the best characterized transcriptional activators. The biological importance of Sp1 is underscored by the fact that several hundreds of genes are thought to be regulated by this protein. However, during the last 5 years, a more extended family of Sp1-like transcription factors has been identified and characterized by the presence of a conserved DNA-binding domain comprising three Krüppel-like zinc fingers. Each distinct family member differs in its ability to regulate transcription, and, as a consequence, to influence cellular processes. Specific activation and repression domains located within the N-terminal regions of these proteins are responsible for these differences by facilitating interactions with various co-activators and co-repressors. The present review primarily focuses on discussing the structural, biochemical and biological functions of the repressor members of this family of transcription factors. The existence of these transcriptional repressors provides a tightly regulated mechanism for silencing a large number of genes that are already known to be activated by Sp1.

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