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Improving FRET dynamic range with bright green and red fluorescent proteins
Amy J Lam1, François St-Pierre, Yiyang Gong
1Department of Bioengineering, Stanford University, Stanford, California, USA.
Nature Methods
|September 11, 2012
Summary
Researchers developed brighter fluorescent proteins, Clover and mRuby2, to improve Förster resonance energy transfer (FRET) reporters. These new proteins enhance detection of cellular biochemical events, overcoming limitations of older CFP-YFP systems.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Genetically encoded reporters utilize Förster resonance energy transfer (FRET) to monitor biochemical processes in living cells.
- Conventional CFP-YFP FRET pairs exhibit limitations including low dynamic range, phototoxicity, and complex photokinetic behaviors like photobleaching and photoconversion.
Purpose of the Study:
- To engineer novel fluorescent proteins that overcome the limitations of existing FRET reporters.
- To develop a superior FRET pair with enhanced brightness, photostability, and dynamic range for improved cellular process monitoring.
Main Methods:
- Engineering of two new fluorescent proteins: Clover (green) and mRuby2 (red), designed for optimal FRET performance.
- Systematic replacement of CFP and YFP in established FRET reporters for kinase activity, GTPase activity, and transmembrane voltage.
- Comparative analysis of FRET efficiency, photostability, and dynamic range using the new Clover-mRuby2 pair versus traditional CFP-YFP pairs.
Main Results:
- Clover and mRuby2 identified as the brightest green and red fluorescent proteins, respectively, with the largest Förster radius for a ratiometric FRET pair.
- Reporters utilizing Clover and mRuby2 demonstrated significantly improved photostability and FRET dynamic range compared to CFP-YFP reporters.
- Enhanced emission ratio changes were observed, facilitating more sensitive detection of biochemical events.
Conclusions:
- The novel Clover-mRuby2 FRET pair offers substantial improvements over standard CFP-YFP systems for live-cell imaging.
- These advancements enable more robust and sensitive detection of transient biochemical dynamics, including neuronal firing and RhoA activation.
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