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American Society for Microbiology, Molecular and Cellular Biology, 10(14), p. 6907-6914, 1994

DOI: 10.1128/mcb.14.10.6907-6914.1994

American Society for Microbiology, Molecular and Cellular Biology, 10(14), p. 6907-6914, 1994

DOI: 10.1128/mcb.14.10.6907

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The opposite and antagonistic effects of the closely related POU family transcription factors Brn-3a and Brn-3b on the activity of a target promoter are dependent on differences in the POU domain.

Journal article published in 1994 by Peter J. Morris, Thomas Theil ORCID, Christopher J. A. Ring, Lillycrop Ka, Karen A. Lillycrop, Tarik Moroy, David S. Latchman
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The Brn-3a, Brn-3b, and Brn-3c POU family transcription factors are closely related to one another and are members of the group IV subfamily of POU factors. Here we show that despite this close relationship, the factors have different effects on the activity of a target promoter: Brn-3a and Brn-3c stimulate the promoter whereas Brn-3b represses it. Moreover, Brn-3b can antagonize the stimulatory effect of Brn-3a on promoter activity and can also inhibit promoter activation by the Oct-2.1 POU factor. The difference in the transactivation activities of Brn-3a and Brn-3b is dependent upon the C-terminal region containing the POU domain of the two proteins, since exchange of this domain between the two factors converts Brn-3a into a repressor and Brn-3b into an activator.