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Controlling Multivalent Binding through Surface Chemistry: Model Study on Streptavidin.

Galina V Dubacheva1,2, Carolina Araya-Callis1, Anne Geert Volbeda3

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Summary
This summary is machine-generated.

Stable surface binding of streptavidin (SAv) requires at least divalent interaction with biotinylated surfaces. This study quantifies residual valency and orientation, enabling precise control over surface-bound molecular architectures for applications in biosensors and biomaterials.

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Area of Science:

  • Nanotechnology and Surface Science
  • Biomolecular Interactions
  • Materials Science

Background:

  • Quantitative understanding of surface-bound molecule valency and orientation is crucial for nanotechnology.
  • Streptavidin (SAv) binding to biotinylated surfaces is a common model system, but its immobilization characteristics are not fully understood.

Purpose of the Study:

  • To quantitatively determine the residual valency and orientation of surface-bound streptavidin (SAv).
  • To investigate the influence of surface properties and SAv valency on immobilization stability and kinetics.
  • To provide insights for the rational design of surface-confined supramolecular architectures.

Main Methods:

  • Quartz crystal microbalance with dissipation monitoring (QCM-D) for stability and kinetics.
  • Spectroscopic ellipsometry for quantifying residual SAv valency.
  • Utilized purpose-designed SAv constructs with controlled valencies (mono-, di-, trivalent).

Main Results:

  • Divalent interaction of SAv with biotinylated surfaces is essential for stable immobilization.
  • Monovalent attachment is reversible and can disrupt supported lipid bilayers (SLBs).
  • Surface density, mobility of biotin, and SAv coverage affect SAv orientation and residual valency.

Conclusions:

  • Residual valency of immobilized SAv can be tuned to one or two biotin binding sites via surface chemistry.
  • Findings enable rational design of surface-confined supramolecular assemblies with tunable valency.
  • This knowledge supports the development of advanced bioactive coatings, biosensors, and biomimetic systems.