Transcriptional regulation of the human gene coding for proline-rich nuclear receptor coactivator (PNRC) by regulatory factor X (RFX1)

Transcriptional regulation of the human gene coding for proline-rich nuclear receptor coactivator (PNRC) by regulatory factor X (RFX1)
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调节因子 X (RFX1) 对编码富含脯氨酸核受体共激活因子 (PNRC) 的人类基因的转录调节

DOI:
10.1134/s0026893309010099
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发表时间:
2009-02
期刊:
影响因子:
1.2
通讯作者:
Zhang, Y.
Zhang, Y.
中科院分区:
生物学4区
文献类型:
--
作者:
Zhou, D. J.;Lou, G. Y.;Chen, M.;Chen, B.;Li, Y. P.;Chen, J.;Zhang, Y.

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PNRC(富含脯氨酸核受体共激活剂)是一种新型的多种核受体共激活剂。 PNRC 之前是在人乳腺 cDNA 表达文库的酵母双杂交筛选中使用牛 SF-1(类固醇生成因子 1)作为诱饵进行鉴定的。为了了解调节人PNRC基因表达的分子机制,本研究对人PNRC基因的5'侧翼区域进行功能分析,揭示-123/+27区域是人PNRC基因的最小启动子。凝胶迁移和 ChIP 分析证明了 RFX1(调节因子 X)蛋白与人 PNRC 启动子区域的特异性结合。在共转染实验中,RFX1 显示以剂量依赖性方式抑制 PNRC 基因的启动子活性。这些结果表明r RFX1 特异性结合到启动子区域并负向调节人PNRC 基因的转录。
PNRC (Proline-rich Nuclear Receptor Coactivator) is a novel coactivator for multiple nuclear receptors. PNRC was previously identified using bovine SF-1 (steroidogenic factor 1) as the bait in a yeast two-hybrid screening of a human mammary gland cDNA expression library. To understand the molecular mechanisms that regulate the expression of human PNRC gene, in this study, functional analysis of the 5′ flanking region of the human PNRC gene revealed that the −123/+27 region is the minimal promoter of the human PNRC gene. Gel shift and ChIP analyses demonstrated the specific binding of RFX1 (Regulatory Factor X) protein to the human PNRC promoter region. In co-transfection experiments RFX1 was shown to repress promoter activity of PNRC gene in a dose-dependent manner. These results indicate that r RFX1 specifically bind to promoter region and negatively regulate the transcription of the human PNRC gene.
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