The Unique Tryptophan Residue of the Vitamin D Receptor Is Critical for Ligand Binding and Transcriptional Activation

The Unique Tryptophan Residue of the Vitamin D Receptor Is Critical for Ligand Binding and Transcriptional Activation
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维生素 D 受体的独特色氨酸残基对于配体结合和转录激活至关重要

DOI:
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发表时间:
2001
影响因子:
6.2
通讯作者:
R. Kremer
R. Kremer
中科院分区:
医学1区
文献类型:
--
作者:
C. Solomon;M. Macoritto;Xiaoling Gao;John H. White;R. Kremer

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人维生素D受体(human vitamin D receptor,hVDR)是核受体超家族转录调节因子的一员。在这里,我们发现hVDR的色氨酸286对于1,25-二羟基维生素D3 [1,25(OH)2D 3]靶基因的配体结合和反式激活至关重要。产生了hVDR的两种突变体W286 A和W286 F,其中色氨酸分别被丙氨酸或苯丙氨酸取代。W286 A突变体不结合1,25(OH)2D 3,在体外与类固醇受体共激活因子1(SRC-1)相互作用,或激活转录。此外,W286 A受体不以配体依赖性方式与人维甲酸X受体α(hRXRα)异二聚化。尽管W286 F受体与hRXRα异二聚化,与SRC-1相互作用,并结合1,25(OH)2D 3,但其反式激活能力严重减弱。因此,hVDR的色氨酸286在特异性1,25(OH)2D 3配体相互作用中以及随后在hVDR/RXR相互作用、SRC-1结合和1,25(OH)2D 3靶基因的配体依赖性反式激活中起重要作用。这些结果确定了VDR中配体结合绝对需要的第一个氨基酸,并进一步确定了1,25(OH)2D 3与其受体相互作用的结构-功能关系。
The human vitamin D receptor (hVDR) is a member of the nuclear receptor superfamily of transcriptional regulators. Here we show that tryptophan 286 of the hVDR is critical for ligand binding and transactivation of 1,25‐dihydroxyvitamin D3 [1,25(OH)2D3] target genes. Two mutants of the hVDR were produced, W286A and W286F, in which the tryptophan was replaced with an alanine or a phenylalanine, respectively. The W286A mutant did not bind 1,25(OH)2D3, interact with steroid receptor coactivator 1 (SRC‐1) in vitro, or activate transcription. Moreover, the W286A receptor did not heterodimerize in a ligand‐dependent manner with the human retinoid X receptor α (hRXRα). Although the W286F receptor heterodimerized with hRXRα, interacted with SRC‐1, and bound 1,25(OH)2D3, its capacity to transactivate was attenuated severely. Thus, tryptophan 286 of hVDR plays an important role in specific 1,25(OH)2D3 ligand interaction and subsequently in hVDR/RXR interaction, SRC‐1 binding, and ligand‐dependent transactivation of 1,25(OH)2D3 target genes. These results identify the first amino acid that is absolutely required for ligand binding in the VDR and further define the structure‐function relationship of 1,25(OH)2D3 interaction with its receptor.
大肠杆菌中表达的人视黄醇 X 受体 α 的配体结合域的表征。
DOI: --
发表时间: 1994
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影响因子: --
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来自对 1,25-二羟基维生素 D3 耐药的患者的维生素 D 受体:点突变导致对配体反应的反式激活减少,并损害与类视黄醇 X 受体异二聚体伴侣的相互作用。
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发表时间: 1996
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发表时间: 1989-04-15
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影响因子: 3.5
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通讯作者: PEASE, LR
DOI: 10.1006/abbi.1999.9999
发表时间: 1999
期刊: Archives of biochemistry and biophysics.
影响因子: --
作者:
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通讯作者: DeLuca,HF