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Nucleic Acids Research, Vol 24, Issue 11 1981-1986, Copyright © 1996 by Oxford University Press

ARTICLES

The transcription factors Sp1 and Oct-1 interact physically to regulate human U2 snRNA gene expression

AC Strom, M Forsberg, P Lillhager and G Westin
Department of Medical Genetics, Uppsala University, Biomedical Centre, Uppsala, Sweden.

The expression of human small nuclear U2 RNA genes is controlled by the proximal sequence element (PSE), which determines the start site of transcription, and a distal sequence element (DSE). The DSE contains an octamer element and three Sp1 binding sites. The octamer, like the PSE, is essential for U2 transcription. The Sp1 sites contribute to full promoter activity by distance-dependent cooperative interactions with the transcription factors Sp1 and Oct-1. Here we show that purified recombinant Sp1 and Oct-1 bind cooperatively to the DSE and that they physically interact in vitro. Furthermore, we show that Sp1 and Oct-1 interact in vivo using a yeast two-hybrid system. The domain of Sp1 which interacts with Oct-1 is confined to the region necessary for transcriptional stimulation of U2 RNA transcription. This region contains the glutamine-rich activation domain B and a serine/threonine- rich part. The results demonstrate that Sp1, in addition to binding to a number of other factors, also interacts directly with transcription factor Oct-1.
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