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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Collecting single molecules with conventional optical tweezers.

Wolfgang Singer1, Timo A Nieminen, Norman R Heckenberg

  • 1Centre for Biophotonics and Laser Science, Department of Physics, The University of Queensland, Brisbane, Queensland 4072, Australia. singer@physics.uq.edu.au

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
Summary

Optical tweezers can concentrate large molecules like polyethylene oxide in water without aggregation. This technique offers potential for protein crystal nucleation by controlling molecule concentration with trapping potential.

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Area of Science:

  • Biophysics
  • Optical trapping
  • Polymer science

Background:

  • Optical tweezers are effective for manipulating micro- and nanoparticles.
  • The size range of optical tweezers extends to large single molecules.
  • Controlling molecule concentration is crucial for various applications.

Purpose of the Study:

  • To demonstrate the capability of optical tweezers for collecting polyethylene oxide molecules.
  • To investigate molecule behavior and concentration changes within the trap.
  • To develop a model correlating trapping potential with concentration changes.

Main Methods:

  • Experimental manipulation of polyethylene oxide molecules using optical tweezers in an aqueous environment.
  • Observation of molecule accumulation and aggregation within the focal volume.

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  • Development and application of a theoretical model to quantify concentration changes.

    • Main Results:

    • Optical tweezers successfully collected polyethylene oxide molecules, creating regions of increased concentration.
    • Accumulated molecules did not aggregate, maintaining individual molecule integrity.
    • A model was established to link trapping potential to the observed concentration changes.

    Conclusions:

    • Optical tweezers provide a method for controlled concentration of large molecules in solution.
    • The non-aggregating nature of concentrated molecules is advantageous for further manipulation.
    • This technique shows promise for applications such as assisting protein crystal nucleation due to its applicability to protein molecules.