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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
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Quantitative dual-channel FRET microscopy.

Lichun Wei, Jiang Zhang, Zihao Mai

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    Summary
    This summary is machine-generated.

    We developed Lux-E-FRET, a new method for Förster resonance energy transfer (FRET) measurements. This technique overcomes spectral crosstalk, enabling accurate FRET analysis even with overlapping donor and acceptor spectra.

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    Area of Science:

    • Biophysics
    • Fluorescence Spectroscopy
    • Cell Biology

    Background:

    • Quantitative Förster resonance energy transfer (E-FRET) measurements are crucial for studying molecular interactions.
    • Existing E-FRET methods are often hindered by donor emission and acceptor direct excitation crosstalk.
    • These spectral interferences limit the application of FRET, especially for spectrally overlapping fluorophores.

    Purpose of the Study:

    • To develop a novel E-FRET approach that overcomes spectral crosstalk limitations.
    • To introduce Lux-E-FRET, a method based on linear unmixing for enhanced FRET analysis.
    • To demonstrate the applicability of Lux-E-FRET for FRET constructs in living cells.

    Main Methods:

    • Developed Lux-E-FRET, utilizing linear unmixing of fluorescence intensity ratios across two detection channels and two excitation wavelengths.
    • The method does not require selective emission collection or excitation of donor/acceptor fluorophores.
    • For tandem FRET sensors, Lux-E-FRET simplifies measurements to a single excitation wavelength.

    Main Results:

    • Successfully implemented Lux-E-FRET on a dual-channel wide-field fluorescence microscope.
    • Achieved FRET efficiency measurements in living cells that are consistent with established methods.
    • Demonstrated that Lux-E-FRET effectively eliminates spectral crosstalk issues.

    Conclusions:

    • Lux-E-FRET provides a robust solution to spectral crosstalk in FRET measurements.
    • This novel approach is applicable to donor-acceptor pairs with significant spectral overlap.
    • Lux-E-FRET enhances the reliability and scope of quantitative FRET analysis in biological systems.