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Related Experiment Videos

Combined optical trapping and single-molecule fluorescence.

Matthew J Lang1, Polly M Fordyce, Steven M Block

  • 1Department of Biological Sciences, Stanford University, Stanford, CA 94305-5020, USA.

Journal of Biology
|May 8, 2003
PubMed
Summary
This summary is machine-generated.

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Researchers developed a novel instrument for simultaneous optical trapping and single-molecule fluorescence, overcoming previous limitations. This breakthrough enables new experiments combining mechanical force application with molecular structure monitoring.

Area of Science:

  • Biophysics
  • Optical physics
  • Molecular biology

Background:

  • Single-molecule fluorescence and optical trapping are key techniques in molecular research.
  • Previous attempts to combine these methods faced challenges due to high light intensity in optical traps overwhelming faint fluorescence signals.
  • Existing methods often used techniques sequentially or spatially separated, limiting experimental scope.

Purpose of the Study:

  • To develop an instrument for simultaneous, spatially coincident optical trapping and single-molecule fluorescence.
  • To overcome the technical hurdles of combining high-intensity optical trapping with low-intensity fluorescence detection.
  • To enable new experimental possibilities in single-molecule studies.

Main Methods:

  • Designed a novel instrument integrating optical trapping and single-molecule fluorescence.

Related Experiment Videos

  • Utilized advanced optical design, high-performance spectral notch filters, and carefully selected fluorophores.
  • Implemented computer automation for rapid data acquisition.

    • Main Results:

    • Successfully demonstrated simultaneous optical trapping and single-molecule fluorescence on a single DNA molecule.
    • Observed force-induced strand separation of double-stranded DNA using the combined technique.
    • Correlated mechanical transitions during DNA unzipping with fluorescence changes.

    Conclusions:

    • It is feasible to combine optical trapping and single-molecule fluorescence through optimized optical design and data acquisition.
    • This integrated approach allows for controlled mechanical loading and simultaneous monitoring of molecular structure.
    • The developed instrument expands the possibilities for studying macromolecular behavior under force.