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Related Experiment Videos

Streptavidin binding observed with an atomic force microscope.

A L Weisenhorn1, F J Schmitt, W Knoll

  • 1Department of Physics, University of California, Santa Barbara 93106-9530.

Ultramicroscopy
|July 1, 1992
PubMed
Summary
This summary is machine-generated.

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Atomic force microscopy revealed streptavidin binding to biotinylated lipid bilayers. Streptavidin preferentially attached to fluid domains, causing height changes and contrast reversal in the bilayer over time.

Area of Science:

  • Biophysics
  • Surface Science
  • Materials Science

Background:

  • Lipid bilayers exhibit phase coexistence, with fluid and crystalline domains.
  • Streptavidin-biotin interactions are crucial in biological systems and nanotechnology.
  • Atomic force microscopy (AFM) is a powerful tool for nanoscale imaging and force measurements.

Purpose of the Study:

  • To investigate the real-time binding dynamics of streptavidin to biotinylated lipid bilayers using AFM.
  • To observe the structural and topographical changes in the lipid bilayer upon streptavidin binding.
  • To determine the binding preference of streptavidin for different lipid domains.

Main Methods:

  • Atomic force microscopy (AFM) was employed to image the lipid bilayer.
  • Real-time monitoring of the recognition reaction between streptavidin and biotinylated lipid bilayers.

Related Experiment Videos

  • Force-dependent structural analysis of bound streptavidin molecules.

    • Main Results:

    • Phase coexistence of fluid and crystalline domains was observed in the lipid bilayer.
    • Streptavidin binding occurred predominantly in the fluid domains, leading to a height increase and contrast reversal.
    • Less than 0.25% of crystalline domains were covered by streptavidin.
    • Molecular resolution of compressed streptavidin at the air-water interface was achieved.

    Conclusions:

    • Streptavidin exhibits a strong preference for binding to the fluid domains of biotinylated lipid bilayers.
    • The binding process induces significant topographical changes in the bilayer structure.
    • AFM provides valuable insights into molecular recognition events at interfaces.