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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Lattice diffusion of a single molecule in solution.

Francesca Ruggeri1, Madhavi Krishnan1,2

  • 1Department of Chemistry, University of Zürich,Winterthurerstrasse 190, CH 8057 Zürich, Switzerland.

Physical Review. E
|January 20, 2018
PubMed
Summary
This summary is machine-generated.

Researchers can now measure a single molecule's size and electrical charge using electrostatic traps. This technique tracks molecule movement in a lattice, providing insights into macromolecular conformation and dynamics.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Nanotechnology

Background:

  • Single-molecule studies offer high-resolution insights into macromolecular behavior.
  • Electrostatic trapping provides a method to isolate and manipulate individual molecules in solution.
  • Understanding molecular size and charge is crucial for fields like drug delivery and diagnostics.

Purpose of the Study:

  • To develop a method for simultaneously measuring the size and effective electrical charge of single macromolecules.
  • To investigate the diffusion dynamics of single macromolecules within a 2D lattice of electrostatic traps.
  • To establish a technique suitable for analyzing weakly emitting or transient molecular species.

Main Methods:

  • Utilizing a 2D lattice of electrostatic traps to confine individual macromolecules in solution.
  • Employing fluorescence microscopy to monitor single-molecule transport trajectories.
  • Analyzing trapping times and inter-trap travel times to extract molecular properties.

Main Results:

  • Demonstrated that molecule residence time in traps correlates with effective electrical charge.
  • Showed that average travel time between traps is indicative of the molecule's hydrodynamic radius.
  • Established that combining these two time scales uniquely determines both size and charge.

Conclusions:

  • This technique offers a novel, non-invasive approach to characterizing single macromolecules.
  • The method is particularly advantageous for studying weakly fluorescent or short-lived molecular entities.
  • The ability to measure both size and charge opens new avenues for single-entity analysis in complex biological systems.