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.
中科院分区:
文献类型:
--
作者:
Gonzalez, Veronica;Hurley, Laurence H.
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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