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Modulation of progesterone receptor binding to progesterone response elements by positioned nucleosomes
T A Pham1, D P McDonnell, M J Tsai
1Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030.
Biochemistry
|February 11, 1992
Summary
Nucleosome positioning, not histone source, affects progesterone receptor binding to DNA. This suggests DNA-histone interactions within nucleosomes influence steroid receptor function in gene regulation.
Area of Science:
- Molecular Biology
- Epigenetics
- Gene Regulation
Background:
- Steroid hormone receptors regulate gene transcription by interacting with DNA elements on nucleosomes.
- Understanding how nucleosomes influence these interactions is crucial for comprehending gene regulation.
Purpose of the Study:
- To investigate the impact of nucleosome positioning and histone source on progesterone receptor binding to DNA response elements.
- To elucidate the role of nucleosome structure in modulating steroid receptor-DNA interactions.
Main Methods:
- In vitro reconstitution of nucleosomes with specific DNA elements.
- Examination of progesterone receptor binding affinity to DNA elements at different positions within the nucleosome.
- Comparison of binding across different histone sources and chromatin states (active/inactive).
Main Results:
- Progesterone receptor binding affinity is significantly dependent on the position of the steroid response element within the nucleosome.
- Histone source and chromatin state (active vs. inactive) did not affect receptor binding affinity.
- The strength of DNA-histone interactions appears to modulate receptor binding.
Conclusions:
- Nucleosome positioning is a key factor influencing steroid receptor binding to DNA response elements.
- These findings suggest that the structural organization of DNA within nucleosomes plays a critical role in regulating steroid hormone receptor function in vivo.
- Modulation of DNA-histone interactions by nucleosome positioning impacts gene transcription regulation.
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