1. Discovery of enzyme modulators via high-throughput time-resolved FRET in living cells.
- Author
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Gruber SJ, Cornea RL, Li J, Peterson KC, Schaaf TM, Gillispie GD, Dahl R, Zsebo KM, Robia SL, and Thomas DD
- Subjects
- Animals, Green Fluorescent Proteins chemistry, HEK293 Cells, Hepatocytes metabolism, Humans, Luminescent Proteins chemistry, Sarcoplasmic Reticulum Calcium-Transporting ATPases antagonists & inhibitors, Sarcoplasmic Reticulum Calcium-Transporting ATPases metabolism, Small Molecule Libraries, Red Fluorescent Protein, Biosensing Techniques methods, Fluorescence Resonance Energy Transfer, High-Throughput Screening Assays, Sarcoplasmic Reticulum Calcium-Transporting ATPases isolation & purification
- Abstract
We have used a "two-color" SERCA (sarco/endoplasmic reticulum calcium ATPase) biosensor and a unique high-throughput fluorescence lifetime plate reader (FLT-PR) to develop a high-precision live-cell assay designed to screen for small molecules that perturb SERCA structure. A SERCA construct, in which red fluorescent protein (RFP) was fused to the N terminus and green fluorescent protein (GFP) to an interior loop, was stably expressed in an HEK cell line that grows in monolayer or suspension. Fluorescence resonance energy transfer (FRET) from GFP to RFP was measured in the FLT-PR, which increases precision 30-fold over intensity-based plate readers without sacrificing throughput. FRET was highly sensitive to known SERCA modulators. We screened a small chemical library and identified 10 compounds that significantly affected two-color SERCA FLT. Three of these compounds reproducibly lowered FRET and inhibited SERCA in a dose-dependent manner. This assay is ready for large-scale HTS campaigns and is adaptable to many other targets.
- Published
- 2014
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