The C-terminus of nucleolin promotes the formation of the c-MYC G-quadruplex and inhibits c-MYC promoter activity.

The C-terminus of nucleolin promotes the formation of the c-MYC G-quadruplex and inhibits c-MYC promoter activity.
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DOI:
10.1021/bi100509s
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发表时间:
2010-11-16
期刊:
影响因子:
2.9
通讯作者:
Hurley, Laurence H.
Hurley, Laurence H.
中科院分区:
生物学3区
文献类型:
--
作者:
Gonzalez, Veronica;Hurley, Laurence H.

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核仁蛋白是真核细胞中最丰富的核仁磷蛋白,主要因其在核糖体生物发生和细胞增殖中的作用而闻名。然而,它是一种多功能蛋白质,根据细胞环境,可以驱动细胞增殖或凋亡。我们的实验室最近证明,核仁素可以通过结合并稳定 c-MYC 启动子区域中 G-四链体结构的形成,从而起到 c-MYC 转录抑制因子的作用,该区域负责控制 85-90% 的 c-MYC 转录活性。在这项研究中,我们研究了 c-MYC 抑制所需的核仁素的结构元件。通过圆二色分光偏振法 (CD)、1 热稳定性和体外转录评估核仁素缺失突变体对 c-MYC G-四链体的形成和稳定性以及 c-MYC 转录活性的影响。在这里,我们报告核仁素的 RNA 结合域 (RBD) 3 和 4,以及精氨酸-甘氨酸-甘氨酸 (RGG) 域是抑制 c-MYC 转录所必需的。
Nucleolin, the most abundant nucleolar phosphoprotein of eukaryotic cells, is known primarily for its role in ribosome biogenesis and cell proliferation. It is, however, a multifunctional protein that, depending on the cellular context, can drive either cell proliferation or apoptosis. Our laboratory recently demonstrated that nucleolin can function as a repressor of c-MYC transcription by binding to and stabilizing the formation of a G-quadruplex structure in a region of the c-MYC promoter responsible for controlling 85–90% of c-MYC’s transcriptional activity. In this study, we investigate the structural elements of nucleolin that are required for c-MYC repression. The effect of nucleolin deletion mutants on the formation and stability of the c-MYC G-quadruplex, as well as c-MYC transcriptional activity, was assessed by circular dichroic spectropolarimetry (CD),1 thermal stability, and in vitro transcription. Here we report that nucleolin’s RNA binding domains (RBDs) 3 and 4, as well as the arginine-glycine-glycine (RGG) domain, are required to repress c-MYC transcription.
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