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A Guide to Structured Illumination TIRF Microscopy at High Speed with Multiple Colors
Published on: May 30, 2016
Optical section structured illumination-based Förster resonance energy transfer imaging
Zhi Liu1,2, Zewei Luo1,2, Hongce Chen1,2
1Key Laboratory of Laser Life Science, Ministry of Education, College of Biophotonics, South China Normal University, Guangzhou, Guangdong, China.
Optical section structured illumination microscopy (OS-SIM) enhances Förster resonance energy transfer (FRET) imaging in living cells. This OS-SIM-FRET approach achieves confocal microscopy-like resolution, improving molecular interaction studies.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- Förster resonance energy transfer (FRET) microscopy is crucial for studying molecular interactions in live cells.
- Optical section structured illumination microscopy (OS-SIM) offers improved spatial resolution compared to widefield microscopy.
Purpose of the Study:
- To evaluate the integration of OS-SIM with FRET imaging for enhanced resolution in live-cell studies.
- To quantitatively assess FRET measurements using OS-SIM compared to widefield microscopy.
Main Methods:
- Quantitative 3-cube FRET imaging was performed in both OS-SIM and widefield microscopy (WF) modes.
- Cells expressing Cerulean (donor) and Venus (acceptor) FRET constructs were analyzed.
- Spectral crosstalk coefficients and system calibration factors were measured and compared between modes.
Main Results:
- OS-SIM imaging yielded higher resolution images than WF imaging.
- Spectral crosstalk and calibration factors were consistent between OS-SIM and WF modes.
- Measured FRET efficiencies and acceptor-to-donor ratios in Hela cells were consistent with reported values.
Conclusions:
- OS-SIM can be effectively integrated with FRET microscopy (OS-SIM-FRET).
- This integrated approach provides confocal microscopy-like resolution for FRET imaging in living cells.
- OS-SIM-FRET advances the study of molecular interactions with improved spatial detail.
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