The transcriptional specificity of NF-κB dimers is coded within the κB DNA response elements.

The transcriptional specificity of NF-κB dimers is coded within the κB DNA response elements.
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DOI:
10.1016/j.celrep.2012.08.042
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发表时间:
2012-10-25
期刊:
影响因子:
8.8
通讯作者:
Ghosh G
Ghosh G
中科院分区:
生物学1区
文献类型:
--
作者:
Wang VY;Huang W;Asagiri M;Spann N;Hoffmann A;Glass C;Ghosh G

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核因子 κB (NF-κB) 通过与特定 DNA 元件(统称为 κB 位点)结合来调节基因表达,这些元件包含在靶基因的启动子/增强子内。我们发现 κB 位点的中心碱基对 (bp) 的身份深刻影响 NF-κB 二聚体的转录活性。 RelA 二聚体更喜欢此位置的 A/T bp,以实现最佳转录激活(以 A/T 为中心),并区分以 G/C 为中心的 κB 位点。相反,p52 同二聚体与 Bcl3 复合,激活以 G/C 为中心的 κB 位点的转录,但抑制以 A/T 为中心的位点的转录。 p52:Bcl3 复合物以不同的模式结合这两类 κB 位点,允许在包含 G/C-、A/T- 或同时以 G/C- 和 A/T 为中心的位点的启动子中募集共激活子、辅阻遏物或共激活子和辅阻遏物复合物。因此,通过感知 κB 位点内的 bp 差异,NF-κB 二聚体通过激活、抑制和改变效应基因的表达来调节生物程序。
Nuclear factor κB (NF-κB) regulates gene expression by binding to specific DNA elements, known collectively as κB sites, that are contained within the promoters/enhancers of target genes. We found that the identity of the central base pair (bp) of κB sites profoundly affects the transcriptional activity of NF-κB dimers. RelA dimers prefer an A/T bp at this position for optimal transcriptional activation (A/T-centric) and discriminate against G/C-centric κB sites. The p52 homodimer, in contrast, activates transcription from G/C-centric κB sites in complex with Bcl3 but represses transcription from the A/T-centric sites. The p52:Bcl3 complex binds to these two classes of κB sites in distinct modes, permitting the recruitment of coactivator, corepressor, or both coactivator and corepressor complexes in promoters that contain G/C-, A/T-, or both G/C- and A/T-centric sites. Therefore, through sensing of bp differences within κB sites, NF-κB dimers modulate biological programs by activating, repressing, and altering the expression of effector genes.
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