Human TEF-5 is preferentially expressed in placenta and binds to multiple functional elements of the human chorionic somatomammotropin-B gene enhancer
Human TEF-5 is preferentially expressed in placenta and binds to multiple functional elements of the human chorionic somatomammotropin-B gene enhancer
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DOI：
10.1074/jbc.272.20.12928
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发表时间：
1997-05-16
影响因子：
4.8
通讯作者：
Davidson, I
中科院分区：
文献类型：
--
作者：
Jacquemin, P;Martial, JA;Davidson, I
We report the cloning of a cDNA encoding the human transcription factor hTEF-5, containing the TEA/ATTS DNA binding domain and related to the TEF family of transcription factors. hTEF-5 is expressed in skeletal and cardiac muscle, but the strongest expression is observed in the placenta and in placenta-derived JEG-3 choriocarcinoma cells, In correlation with its placental expression, we show that hTEF-5 binds to several functional enhansons of the human chorionic somatomammotropin (hCS)-B gene enhancer, We define a novel functional element in this enhancer comprising tandemly repeated sites to which hTEF-5 binds cooperatively. In the corresponding region of the hCS-A enhancer, which is known to be inactive, this element is inactivated by a naturally occurring single base mutation that disrupts hTEF-5 binding. We further show that the binding of the previously described placental protein f/chorionic somatomammotropin enhancer factor-1 to TEF-binding sites is disrupted by monoclonal antibodies directed against the TEA domain and that this factor is a proteolytic degradation product of the TEF factors. These results strongly suggest that hTEF-5 regulates the activity of the hCS-B gene enhancer.
