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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A Drosophila RNA polymerase II transcription factor binds to the regulatory site of an hsp 70 gene.

A Drosophila RNA polymerase II transcription factor that is specific for at least one of the heat-shock genes has been isolated (designated HSTF for heat-shock transcription factor). This factor is required for active transcription of an hsp 70 gene in addition to RNA polymerase II and another general transcription factor, the A factor. Footprint analysis of the HSTF on the hsp 70 gene reveals that it binds specifically to a 55 bp region upstream from the TATA box. Both coding and noncoding DNA strands are completely protected from DNAase I cleavage by the HSTF . HSTF binding occurs in the apparent absence of RNA polymerase II. The HSTF is present in both heat-shocked and nonshocked cells, although it is more transcriptionally active when isolated from heat-shocked cells. The previously described B factor (an RNA polymerase II transcription factor that binds to the TATA box), isolated from nonshocked cells, is significantly reduced in both binding and transcriptional activity in heat-shocked cells. The potential role of the HSTF and the B factor in the activation of heat-shock gene transcription is discussed.[1]


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