PMID: 8598298Mar 15, 1996Paper

Drosophila TFIID binds to a conserved downstream basal promoter element that is present in many TATA-box-deficient promoters

Genes & Development
T W Burke, James T Kadonaga

Abstract

We describe the identification and characterization of a conserved downstream basal promoter element that is present in a subset of Drosophila TATA-box-deficient (TATA-less) promoters by using purified, epitope-tagged TFIID complex (eTFIID) from embryos of transgenic Drosophila. DNase I footprinting of the binding of eTFIID to TATA-less promoters revealed that the factor protected a region that extended from the initiation site sequence (about +1) to approximately 35 nucleotides downstream of the RNA start site. In contrast, there was no apparent upstream DNase I protection or hypersensitivity induced by eTFIID in the -25 to -30 region at which TATA motifs are typically located. Further studies revealed a conserved sequence motif, (A/G)G(A/T)CGTG, termed the downstream promoter element (DPE), which is located approximately 30 nucleotides downstream of the RNA start site of many TATA-less promoters. DNase I footprinting and in vitro transcription experiments revealed that a DPE in its normal downstream location is necessary for transcription of DPE-containing TATA-less promoters and can compensate for the disruption of an upstream TATA box of a TATA-containing promoter. Moreover, a systematic mutational analysis of DNA sequences...Continue Reading

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