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• W2004762387 abstract "The Brn-3a, Brn-3b, and Brn-3c proteins are closely related POU (Pit-Oct-Unc) family transcription factors which are expressed predominantly in neuronal cells. We have identified the α-internexin gene as the first reported, neuronally expressed, target gene whose promoter activity is modulated by these factors. Both the Brn-3a and Brn-3c factors can activate the α-internexin promoter while Brn-3b represses it and can prevent activation by Brn-3a. Using chimeric constructs containing different regions of Brn-3a or Brn-3b, we show that activation of the α-internexin promoter requires the N-terminal region of Brn-3a. In contrast the activation by Brn-3a but not Brn-3b of an artificial promoter containing a synthetic Brn-3 binding site can be shown using the same constructs to be dependent on the POU domain of Brn-3a. Moreover, the isolated POU domain of Brn-3a can activate this artificial promoter but not the α-internexin promoter. Hence Brn-3a contains two distinct transactivation domains, at the N terminus and within the POU domain, whose effect is dependent upon the target promoter. The relationship of gene transactivation by Brn-3a to its ability to transform primary cells which is also dependent on the N-terminal region of the protein is discussed. The Brn-3a, Brn-3b, and Brn-3c proteins are closely related POU (Pit-Oct-Unc) family transcription factors which are expressed predominantly in neuronal cells. We have identified the α-internexin gene as the first reported, neuronally expressed, target gene whose promoter activity is modulated by these factors. Both the Brn-3a and Brn-3c factors can activate the α-internexin promoter while Brn-3b represses it and can prevent activation by Brn-3a. Using chimeric constructs containing different regions of Brn-3a or Brn-3b, we show that activation of the α-internexin promoter requires the N-terminal region of Brn-3a. In contrast the activation by Brn-3a but not Brn-3b of an artificial promoter containing a synthetic Brn-3 binding site can be shown using the same constructs to be dependent on the POU domain of Brn-3a. Moreover, the isolated POU domain of Brn-3a can activate this artificial promoter but not the α-internexin promoter. Hence Brn-3a contains two distinct transactivation domains, at the N terminus and within the POU domain, whose effect is dependent upon the target promoter. The relationship of gene transactivation by Brn-3a to its ability to transform primary cells which is also dependent on the N-terminal region of the protein is discussed." @default.
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• W2004762387 date "1995-02-01" @default.
• W2004762387 modified "2023-10-02" @default.
• W2004762387 title "Activation of the α-Internexin Promoter by the Brn-3a Transcription Factor Is Dependent on the N-terminal Region of the Protein" @default.
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• W2004762387 doi "https://doi.org/10.1074/jbc.270.6.2853" @default.
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