Abstract
We have characterized the interactions between the TATA element and other sequence elements of a human heat shock protein 70 (hsp70) promoter by a mutational approach. Expression of a distal element of this promoter requires an intact TATA element in human cell lines. The hsp70 TATA element can be functionally replaced for this interaction by TATA elements from the simian virus 40 early and adenovirus EIIa promoters. The TATA element in this promoter therefore both determines the appropriate start site and determines strength by allowing function of the distal element. In contrast, three proximal upstream elements necessary for basal and heat-regulated transcription have no requirement either for a TATA element or for any other proximal element. The behavior of promoters multiply mutant in these proximal elements implies that these elements function independently. We examined the interaction between the heat shock element (HSE) and the TATA element as the distance between the two factor-binding sites was increased. It was necessary to create a mutant HSE with an extended consensus sequence in order for the HSE to function at a distance. Moving this extended HSE 500 bases upstream did not increase its dependence on the TATA element, suggesting that the TATA independence of this element is intrinsic to its function and is not determined by distance from the promoter.
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