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Related Concept Videos

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Single-Molecule Manipulation in Zero-Mode Waveguides.

Leonard C Schendel1, Magnus S Bauer1, Steffen M Sedlak1

  • 1Lehrstuhl für Angewandte Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Amalienstrasse 54, Munich, 80799, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|March 7, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new method to simultaneously measure force and fluorescence in single-molecule studies. This technique allows researchers to observe receptor-ligand interactions and enzymatic activity with unprecedented detail.

Keywords:
force activationmechanosensingsingle-molecule fluorescencezero mode waveguides

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Area of Science:

  • Biophysics
  • Biochemistry
  • Molecular Biology

Background:

  • Simultaneous force and fluorescence measurements are crucial for understanding mechanobiology.
  • Combining atomic force microscopy (AFM) with total internal reflection fluorescence microscopy (TIRF) or zero mode waveguides (ZMWs) is challenging.
  • Existing methods struggle with high labeled substrate concentrations and precise manipulation.

Purpose of the Study:

  • To establish a fully automated workflow for single-molecule manipulation within ZMWs.
  • To enable simultaneous force measurements and single-molecule fluorescence detection.
  • To investigate receptor-ligand interactions and enzymatic turnover dynamics.

Main Methods:

  • Developed an automated workflow for autonomous single-molecule manipulation inside ZMWs.
  • Utilized noninvasive cantilever tip localization for precise force application.
  • Employed a protein model system: streptavidin-ligand interaction with biotin-tagged ligand.
  • Integrated atomic force microscopy (AFM) with zero mode waveguides (ZMWs).

Main Results:

  • Successfully manipulated single molecules within ZMWs using AFM.
  • Demonstrated concurrent measurement of force response and single-molecule fluorescence.
  • Observed ligand unbinding from streptavidin and subsequent rebinding of fluorescently labeled biotin.
  • Quantified rebinding rates of the receptor-ligand complex.

Conclusions:

  • The seamless fusion of AFM and ZMWs provides a powerful platform for mechanobiology studies.
  • This integrated technique allows for detailed investigation of molecular interactions and dynamics.
  • The developed workflow enables precise manipulation and simultaneous multi-modal detection of single molecules.