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Researchers created self-assembling flagellar nanotubes displaying nanobodies for target recognition. This novel method fabricates functionalized nanomaterials for biosensorics and bio-nanotechnology applications.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Engineering

Background:

  • Bacterial flagellar filaments offer a robust scaffold for nanomaterial fabrication.
  • Displaying functional proteins on these filaments requires precise engineering of subunit interactions.
  • Self-assembling nanostructures with specific recognition capabilities are crucial for advanced applications.

Purpose of the Study:

  • To develop a method for fabricating self-assembling tubular nanostructures with target recognition functionalities.
  • To engineer bacterial flagellar filaments to display single-domain antibodies (nanobodies) on their surface.
  • To demonstrate the functional insertion of an anti-green fluorescent protein (GFP) nanobody into flagellin.

Main Methods:

  • Utilized bacterial flagellar filaments as scaffolds for nanobody display.
  • Developed a novel linker selection procedure for functional internal insertion of nanobodies into flagellin.
  • Employed magnetic microparticles for selection of functional fusion constructs.
  • Characterized filament formation using Transmission Electron Microscopy (TEM).
  • Assessed binding affinity using Isothermal Titration Calorimetry (ITC) and fluorescence measurements.

Main Results:

  • Successfully inserted an anti-GFP nanobody into the flagellin structure, replacing the D3 domain.
  • Identified appropriate linkers enabling functional filament formation on host cells.
  • TEM confirmed the formation of short flagellar nanotubes (2-900 nm).
  • Demonstrated high binding affinity of the fusion protein to GFP.

Conclusions:

  • The developed approach enables the creation of functionalized flagellar nanotubes.
  • This method allows for the display of various target recognition molecules.
  • Potential applications exist in biosensorics and bio-nanotechnology.