Abstract
Pit-1, a tissue-specific POU domain transcription factor, is required for the activation of the prolactin, growth hormone, and Pit-1 promoters that confer regulation by epidermal growth factor, adenosine 3′,5′-monophosphate (cAMP), and phorbol esters. Pit-1 is phosphorylated in pituitary cells at two distinct sites in response to phorbol esters and cAMP. Phosphorylation of Pit-1 modifies its conformation on DNA recognition elements and results in increased binding at certain sites and decreased binding at other sites, dependent on DNA sequences adjacent to the core Pit-1 binding motif. One residue (Thr 220 ), located in the POU homeodomain within a sequence conserved throughout the POU-domain family, confers these responses.
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@article{Kapiloff_1991, title={Variable Effects of Phosphorylation of Pit-1 Dictated by the DNA Response Elements}, volume={253}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1652153}, DOI={10.1126/science.1652153}, number={5021}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Kapiloff, Michael S. and Farkash, Yigal and Wegner, Michael and Rosenfeld, Michael G.}, year={1991}, month=aug, pages={786–789} }