Positive and negative modulation of Jun action by thyroid hormone receptor at a unique AP1 site

Positive and negative modulation of Jun action by thyroid hormone receptor at a unique AP1 site
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甲状腺激素受体在独特的 AP1 位点对 Jun 作用的正向和负向调节

DOI:
10.1128/mcb.13.5.3042-3049.1993
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发表时间:
1993
影响因子:
5.3
通讯作者:
Peter J. Kushner
Peter J. Kushner
中科院分区:
生物学2区
文献类型:
--
作者:
G. Lopez;Fred Schaufele;Paul Webb;J. M. Holloway;John D. Baxter;Peter J. Kushner

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我们已经确定了pUC质粒骨架中假定的AP 1位点的特征,并发现了独特的调节作用。该位点定位于核苷酸37周围的19 bp区域,通过Jun或Jun/Fos赋予转录激活作用,通过未配体的甲状腺激素受体(TR)将其增强至5倍。甲状腺激素将TR对Jun反应的增强作用改变为抑制作用。虽然质粒序列是一个接近完美的共有AP 1位点,但来自人胶原酶启动子的完美共有AP 1位点没有显示出相同的效果。TR的配体结合结构域的缺失消除了受体增强Jun活性的能力,并且DNA结合结构域的缺失、突变或特异性变化消除了其增强Jun活性和用激素抑制的能力。在体外Jun/Fos复合物结合的操作质粒片段,TR的存在干扰很少与Jun/Fos结合活性。在DNA的情况下的蛋白质相互作用的研究表明,TR结合Jun蛋白在溶液中,无论是在存在或不存在激素。这些观察结果表明,TR通过调节Jun活性进行协同和抑制的机制:当TR未配体化时为阳性,当激素结合时为阴性。他们还表明,质粒元件的存在可以混淆研究的调控连接的启动子。
We have characterized the putative AP1 site in the backbone of pUC plasmids and found unique regulatory effects. The site, which mapped to a 19-bp region around nucleotide 37, conferred transcriptional activation by Jun or Jun/Fos that was boosted up to fivefold by unliganded thyroid hormone receptor (TR). Thyroid hormone changed potentiation of the Jun response by TR into repression. Although the plasmid sequence is a near-perfect consensus AP1 site, the perfect consensus AP1 site from the human collagenase promoter did not show the same effects. Deletion of the ligand binding domain of the TR eliminated the ability of the receptor to boost Jun activity, and deletion, mutation, or changes in specificity of the DNA binding domain eliminated both its ability to potentiate Jun activity and repress with hormone. In vitro Jun/Fos complexes bound the operative plasmid fragment, and the presence of TR interfered very little with Jun/Fos binding activity. Protein interaction studies in the absence of DNA showed that TR bound Jun protein in solution either in the presence or in the absence of hormone. These observations suggest a mechanism for synergy and repression by TR through modulation of Jun activity: positive when TR is unliganded, and negative when hormone is bound. They also suggest that the presence of the plasmid element can confound studies of the regulation of linked promoters.
DOI: --
发表时间: 1992
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影响因子: --
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期刊: Molecular endocrinology (Baltimore, Md.)
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期刊: Molecular endocrinology (Baltimore, Md.)
影响因子: --
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发表时间: 1989
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