Regulatory functions of a non-ligand-binding thyroid hormone receptor isoform.

Regulatory functions of a non-ligand-binding thyroid hormone receptor isoform.
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非配体结合甲状腺激素受体亚型的调节功能。

DOI:
10.1091/mbc.2.7.565
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发表时间:
1991
期刊:
Cell regulation
影响因子:
--
通讯作者:
Pfahl,M
Pfahl,M
中科院分区:
--
文献类型:
--
作者:
Hermann,T;Zhang,XK;Tzukerman,M;Wills,KN;Graupner,G;Pfahl,M

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甲状腺激素的基因调节是通过多个核受体介导的。在甲状腺激素 T3 存在的情况下,只有部分甲状腺激素受体 (TR) 同工型会成为转录增强子。在这里,我们分析了人类 TR α 2 亚型的调节功能。该蛋白不结合 T3,也不是甲状腺激素反应元件 (TRE) 的转录激活剂。转染的TR α 2 充当转录激活剂TR α 1 和TR β 1 的组成型阻遏物,但也抑制异源受体,包括视黄酸受体和雌激素受体,这些受体可以激活TRE 控制的基因。与活性 TR 相比,TR α 2 蛋白与回文 TRE 的 DNA 结合显着减少。混合受体分析表明,TR α 2 蛋白的特殊性质,包括其阻遏功能和 DNA 结合特征,是其羧基末端的固有性质,并且可以转移到其他受体。尽管已经表明,活性 TR 在没有激素的情况下由于其与 DNA 的强结合而可以充当阻遏子和沉默子,但我们的数据表明 TR α 2 不太可能通过竞争性 DNA 结合机制抑制 TR 和其他受体。抗体凝胶位移实验表明 TR α2 的抑制可能是由于与活性受体的相互作用所致。因此,受体样 TR α 2 亚型在 DNA 结合和配体结合特性方面不同于典型的核受体,并且似乎通过蛋白质-蛋白质相互作用调节其他受体的活性。
Gene regulation by thyroid hormones is mediated through multiple nuclear receptors. Only some of these thyroid hormone receptor (TR) isoforms become transcriptional enhancers in the presence of the thyroid hormone T3. Here we analyze the regulatory function of the human TR alpha 2 isoform. This protein does not bind T3 and is not a transcriptional activator of thyroid hormone-responsive elements (TRE). Transfected TR alpha 2 functions as a constitutive repressor of the transcriptional activators TR alpha 1 and TR beta 1 but also represses heterologous receptors, including the retinoic acid receptor and the estrogen receptor, which can activate TRE-controlled genes. TR alpha 2 protein showed strongly reduced DNA binding to a palindromic TRE when compared with the active TRs. Hybrid receptor analysis revealed that the special properties of the TR alpha 2 protein, including its repressor function and DNA binding characteristics, are intrinsic properties of its carboxyterminus and can be transferred to other receptors. Although it has been shown that the active TRs can act as repressors and silencers due to their strong DNA binding in the absence of hormone, our data show that TR alpha 2 is unlikely to inhibit TRs and other receptors through a competitive DNA binding mechanism. Antibody gel shift experiments suggest that repression by TR alpha 2 might result from interaction with active receptors. Thus, the receptor-like TR alpha 2 isoform differs from typical nuclear receptors in its DNA-binding and ligand-binding properties and appears to regulate the activity of other receptors via protein-protein interaction.
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影响因子: --
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