Sp1 activation of a TATA-less promoter requires a species-specific interaction involving transcription factor IID.


Journal Article

Sp1 is a ubiquitous activator of numerous TATA-containing and TATA-less promoters within the human genome. This transcription factor is distinct from several other mammalian activators because it cannot stimulate transcription of reporter genes when ectopically expressed in Saccharomyces cerevisiae . Here we report that in cultured cells from Drosophila melanogaster human Sp1 efficiently activates transcription from synthetic promoters containing TATA boxes, but not from promoters that contain an initiator instead of a TATA box. The inability of Sp1 to activate initiator-mediated transcription did not result from inactivity of the consensus initiator element used for the experiments, as other initiator functions were conserved in Drosophila cells. Interestingly, a difference between the Drosophila and human TFIID complexes was found to be responsible for the selective inability of Sp1 to activate initiator-mediated transcription in Drosophila; in a complementation assay with a TFIID-depleted HeLa cell extract both the Drosophila and human TFIID complexes supported TATA-mediated transcription, but only the human complex supported initiator-mediated transcription. These results suggest that a species-specific interaction is required for activation of TATA-less promoters by Sp1, revealing a difference in transcriptional activation mechanisms between vertebrates and invertebrates.

Full Text

Duke Authors

Cited Authors

  • Emami, KH; Burke, TW; Smale, ST

Published Date

  • February 1998

Published In

Volume / Issue

  • 26 / 3

Start / End Page

  • 839 - 846

PubMed ID

  • 9443978

Pubmed Central ID

  • 9443978

Electronic International Standard Serial Number (EISSN)

  • 1362-4962

International Standard Serial Number (ISSN)

  • 0305-1048

Digital Object Identifier (DOI)

  • 10.1093/nar/26.3.839


  • eng