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Molecular dynamics study of glucocorticoid receptor-DNA binding
1Beckman Institute, Department of Chemistry, University of Illinois at Urbana-Champaign 61801, USA.
Proteins
|January 1, 1996
Summary
Molecular dynamics simulations reveal how glucocorticoid receptor (GR) dimers bind DNA. The consensus glucocorticoid response element (GRE) facilitates recognition through DNA deformation, enhancing receptor-DNA interactions.
Area of Science:
- Structural biology
- Molecular dynamics simulations
- Genetics
Background:
- Glucocorticoid receptor (GR) plays a crucial role in gene regulation.
- Understanding the molecular mechanisms of GR-DNA binding is essential for deciphering transcriptional regulation.
Purpose of the Study:
- To investigate the binding of the GR dimer to DNA using molecular dynamics simulations.
- To analyze the role of DNA structure and deformation in GR recognition of the glucocorticoid response element (GRE).
Main Methods:
- Molecular dynamics simulations of GR-DNA complexes.
- Utilizing X-ray structures for simulation setup.
- Comparative analysis of protein-DNA interactions, dimer interactions, and DNA structural parameters.
Main Results:
- The consensus GRE promotes favorable and symmetric interactions with GR-DNA binding domains (GR-DBDs).
- GR binding induces significant DNA deformations, including bending, unwinding, and helical axis displacement.
- Deformed GRE enhances protein-DNA and protein-protein interactions, crucial for recognition.
Conclusions:
- The GR dimer recognizes the consensus GRE through induced DNA deformations.
- These deformations are consistent with GR's role in transcriptional regulation via nucleosome packing changes.
- Specific amino acid interactions (glycine-458, serine-459) highlight GR's unique role within nuclear hormone receptors.