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DNA bending between upstream activator sequences increases transcriptional synergy
J Kim1, G de Haan, D J Shapiro
1Department of Biochemistry, University of Illinois, Urbana 61801, USA.
Biochemical and Biophysical Research Communications
|September 24, 1996
Summary
DNA bending, specifically between activator binding sites, significantly enhances transcriptional synergy. This effect was lost when DNA bending was absent or repositioned, highlighting DNA
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Transcriptional synergy, where multiple activators work together, is crucial for gene regulation.
- The role of DNA structure, such as DNA bending, in modulating activator interactions is not fully understood.
Purpose of the Study:
- To investigate whether DNA bending facilitates transcriptional synergy between tandem upstream activators.
- To determine the impact of DNA bending location on synergistic gene activation.
Main Methods:
- Construction of synthetic promoters with specific transcription factor binding sites (AP1, NF1, ACGTGA) and intrinsic DNA bending sequences.
- Transient transfection assays to measure transcriptional activation.
Main Results:
- An intrinsic DNA bending sequence between activator binding sites (AP1 or NF1) and the TATA box strongly enhanced synergistic transcription.
- Replacing the bending sequence with a non-bending mutant or repositioning it upstream of the activators significantly reduced synergistic activation.
Conclusions:
- DNA bending between upstream activator binding sites is a key mechanism for facilitating transcriptional synergy.
- The spatial arrangement of DNA bending relative to activator binding sites is critical for its function in gene regulation.