Abstract
Single-molecule detection (SMD) with fluorescence is a widely used microscopic technique for biomolecule structure and function characterization. The modern light microscope with high numerical aperture objective and sensitive CCD camera can image the brightly emitting organic and fluorescent protein tags with reasonable time resolution. Single-molecule imaging gives an unambiguous bottom-up biomolecule characterization that avoids the “missing information” problem characteristic of ensemble measurements. It has circumvented the diffraction limit by facilitating single-particle localization to ∼1 nm. Probes developed specifically for SMD applications extend the advantages of single-molecule imaging to high probe density regions of cells and tissues. These applications perform under conditions resembling the native biomolecule environment and have been used to detect both probe position and orientation. Native, high density SMD may have added significance if molecular crowding impacts native biomolecule behavior as expected inside the cell.
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Abbreviations
- AOM:
-
Acousto-optic modulator
- AS:
-
Activatable shutter
- BFP:
-
Back focal plane
- BS:
-
Beam stop
- CCD:
-
Charge-coupled device
- Cys707:
-
Myosin head domain highly reactive thiol
- DM:
-
Dichroic mirror
- ELC:
-
Myosin essential light chain
- GFP:
-
Green fluorescent protein
- HCRLC:
-
Human cardiac myosin regulatory light chain
- NA:
-
Numerical aperture
- NSOM:
-
Near-field scanning optical microscope
- PA:
-
Photoactivatable
- PA-FP:
-
Photoactivatable fluorescent protein
- PA-GFP:
-
Photoactivatable green fluorescent protein
- PALM:
-
Photoactivated localization microscopy
- PC:
-
Pockels cell
- PEG:
-
Polyethylene glycol
- PMMA:
-
Polymethylmethacrylate
- PSF:
-
Point spread function
- RLC:
-
Myosin regulatory light chain
- S1:
-
Myosin subfragment 1
- SAF:
-
Supercritical angle fluorescence
- SI:
-
Structured illumination
- SMD:
-
Single-molecule detection
- STED:
-
Stimulated emission depletion
- STORM:
-
Stochastic optical reconstruction microscopy
- TIRF:
-
Total internal reflection microscopy
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Acknowledgments
The work was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) grant R01AR049277; the National Heart, Lung, Blood Institute (NHLBI) grant R01HL095572; and the Mayo Foundation.
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Burghardt, T.P., Ajtai, K. Single-molecule fluorescence characterization in native environment. Biophys Rev 2, 159–167 (2010). https://doi.org/10.1007/s12551-010-0038-z
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DOI: https://doi.org/10.1007/s12551-010-0038-z