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Nucleic Acids Research, 1990, Vol. 18, No. 17 5113-5118
© 1990

MOLECULAR BIOLOGY

Role of TATA-element in transcription from glucocorticoid receptor-responsive model promoters

Stefan Wieland, Michael D. Schatt and Sandro Rusconi*

Institute for Molecular Biology 2, University of Zürich Hönggerberg ETH/HPM, CH-8093 Zürich, Swiitzerland

*To whom correspondence should be addressed

Received June 4, 1990. Revised July 31, 1990. Accepted July 31, 1990.

Transcription activation properties of the rat glucocorticold receptor (GR) on minimal, TATA-box containing or depleted promoters have been tested. We show that a cluster of Glucocorticoid Responsive Elements (GRE), upon activation by the GR, is sufficient to mediate abundant RNA-poiymerase II transcription. We find that in absence of a bona tide TATA-element transcription initiates at a distance of 45–55bp from the activated GRE cluster with a marked preference for sequences homologous to the initiator element (inr). Analyzing defined, bi-directional transcription units we demonstrate that the apparent reduction of specific transcription in strong, TATA-depleted promoters, is mainly due to loss of short-range promoter polarization. The implications for long-range promoter/enhancer communication mechanisms are also discussed.


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