Association of DDX5/p68 protein with the upstream erythroid enhancer element (EHS1) of the gene encoding the KLF1 transcription factor.

Association of DDX5/p68 protein with the upstream erythroid enhancer element (EHS1) of the gene encoding the KLF1 transcription factor.
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DOI:
10.1016/j.jbc.2023.105489
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发表时间:
2023-12
影响因子:
4.8
通讯作者:
Bieker, James J.
Bieker, James J.
中科院分区:
生物学2区
文献类型:
--
作者:
Chen, Xiaoyong;Pillay, Sanjana;Lohmann, Felix;Bieker, James J.

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EKLF/KLF1 是一种重要的转录因子,在红细胞转录激活中发挥全局作用。 KLF1 的调节很有趣,因为它表现出高度受限的表达模式,仅限于红细胞及其祖细胞。在这里,我们使用生化亲和纯化来鉴定 DDX5/p68 蛋白是 KLF1 的激活剂,因为它与红细胞特异性 DNAse 超敏感位点上游增强子元件 (EHS1) 相互作用。我们进一步表明该蛋白质与 DEK 和 CTCF 相关。我们假设 DDX5/p68 与这些以及已知与该元件相互作用的其他蛋白质的相互作用范围使其成为增强酶体复合物的一部分,这对于 KLF1 的最佳表达至关重要,并且能够在 Klf1 位点形成正确的染色质构型。这些单独的相互作用提供了定量的贡献,总而言之,确定了 Klf1 启动子的高水平活性,并表明可以选择性地操纵它们以获得临床益处。
EKLF/KLF1 is an essential transcription factor that plays a global role in erythroid transcriptional activation. Regulation of KLF1 is of interest, as it displays a highly restricted expression pattern, limited to erythroid cells and its progenitors. Here we use biochemical affinity purification to identify the DDX5/p68 protein as an activator of KLF1 by virtue of its interaction with the erythroid-specific DNAse hypersensitive site upstream enhancer element (EHS1). We further show that this protein associates with DEK and CTCF. We postulate that the range of interactions of DDX5/p68 with these and other proteins known to interact with this element render it part of the enhanseosome complex critical for optimal expression of KLF1 and enables the formation of a proper chromatin configuration at the Klf1 locus. These individual interactions provide quantitative contributions that, in sum, establish the high-level activity of the Klf1 promoter and suggest they can be selectively manipulated for clinical benefit.
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