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FLIM-FRET Measurements of Protein-Protein Interactions in Live Bacteria.
Published on: August 25, 2020
Imaging protein interactions by FRET microscopy: FLIM measurements
CSH Protocols
|April 10, 2012
Summary
This protocol outlines fluorescence lifetime imaging (FLIM) for live-cell Förster resonance energy transfer (FRET) measurements. FLIM simplifies FRET analysis by relying on donor fluorescence lifetimes, which are independent of probe concentration and cell shape.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- Live-cell Förster resonance energy transfer (FRET) measurements are crucial for studying molecular interactions in real-time.
- Traditional FRET methods can be complicated by variations in probe concentration and cell morphology.
- Fluorescence lifetimes offer an alternative parameter for FRET analysis that is independent of these confounding factors.
Purpose of the Study:
- To present a basic image acquisition protocol for fluorescence lifetime imaging (FLIM).
- To highlight the advantages of FLIM for live-cell FRET measurements.
Main Methods:
- Development of a standard operating procedure for acquiring FLIM image series.
- Utilizing donor fluorescence lifetimes as the primary data for FRET analysis.
Main Results:
- Demonstration that fluorescence lifetimes are independent of probe concentration.
- Confirmation that fluorescence lifetimes are independent of light path length and thus cell shape.
Conclusions:
- FLIM provides a robust method for live-cell FRET measurements.
- This protocol facilitates the application of FLIM by simplifying image acquisition.
- FLIM overcomes key limitations of traditional FRET techniques, enhancing feasibility in cellular environments.
