Activation of the metallothionein-I gene promoter in response to cadmium and USF in vitro.

Activation of the metallothionein-I gene promoter in response to cadmium and USF in vitro.
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金属硫蛋白-I 基因启动子在体外响应镉和 USF 的激活。

DOI:
10.1006/bbrc.1996.5655
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发表时间:
1997
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Jacob,ST
Jacob,ST
中科院分区:
--
文献类型:
--
作者:
Datta,PK;Jacob,ST

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为了阐明金属硫蛋白(MT)基因激活的分子机制,我们构建了一个无G的小鼠MT-Ⅰ启动子,并在HeLa细胞核提取物中转录。MT-I基因在该提取物中被有效转录,并且转录起始发生在正确的位点(+1)。MT-I基因的转录被刺激三至五倍,从镉处理的细胞的核提取物相对于从未处理的细胞的提取物。MT-I启动子也被重组USF 1激活三到四倍,USF 1是一种螺旋-环-螺旋-亮氨酸拉链DNA结合转录因子,可识别MT-I启动子上的主要晚期转录因子(MLTF)结合位点。据我们所知,这是第一个报告的MT-I启动子在体外激活的有毒金属和转录因子USF。
To elucidate the molecular mechanism of metallothionein (MT) gene activation in response to various inducers, we constructed a G-less mouse MT-I promoter and transcribed in HeLa nuclear extract. The MT-I gene was transcribed efficiently in this extract and initiation of transcription occurred at the correct site (+1). Transcription of the MT-I gene was stimulated three- to fivefold in the nuclear extract from the cadmium-treated cells relative to the extract from the untreated cells. The MT-I promoter was also activated three- to fourfold by recombinant USF1, a helix-loop-helix-leucine zipper DNA binding transcription factor that recognizes the major late transcription factor (MLTF) binding site on the MT-I promoter. To our knowledge, this is the first report of the activation of MT-I promoterin vitroby a toxic metal and by the transcription factor USF.
正调控因子与 106 个碱基对上游区域的相互作用控制肝脏中金属硫蛋白-I 基因的转录。
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