Estrogen receptor alpha/co-activator interaction assay: TR-FRET

Area of Science:

• Biochemistry
• Molecular Biology
• Assay Development

Background:

• Time-resolved fluorescence resonance energy transfer (TR-FRET) is a sensitive technique for quantifying molecular interactions.
• Lanthanide donors and acceptor fluorophores enable robust FRET measurements with reduced background noise.
• TR-FRET assays are valuable for studying protein-protein interactions in biological systems.

Purpose of the Study:

• To develop and validate a TR-FRET assay for monitoring estrogen receptor alpha (ERα) interactions.
• To characterize the disruption of ERα coactivator complex formation by specific inhibitors.
• To demonstrate the utility of TR-FRET for drug discovery targeting ERα signaling.

Main Methods:

• Utilized time-resolved fluorescence resonance energy transfer (TR-FRET) methodology.
• Employed a terbium chelate-labeled estrogen receptor alpha ligand binding domain as the donor.
• Used a fluorescein-labeled coactivator protein SRC3 as the acceptor to detect interactions.
• Quantified energy transfer by measuring the ratio of acceptor to donor emission.

Main Results:

• Successfully established a TR-FRET assay to detect ERα and SRC3 protein interactions.
• Demonstrated that a specific peptide and a small molecule inhibitor disrupt the ERα-SRC3 complex.
• Observed a decrease in FRET signal upon disruption of the molecular interaction.

Conclusions:

• The developed TR-FRET assay is effective for monitoring ERα-coactivator interactions.
• This assay can be used to screen for compounds that modulate ERα signaling pathways.
• TR-FRET provides a robust and sensitive platform for studying molecular interactions in drug discovery.