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Related Experiment Video

Updated: Jul 16, 2025

Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy
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Two molecule force spectroscopy on ligand-receptor interactions.

Jiacheng Zuo1, Hui Chen2, Hongbin Li1

  • 1Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada. Hongbin@chem.ubc.ca.

Nanoscale
|September 23, 2023
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Summary
This summary is machine-generated.

Studying multivalent ligand-receptor interactions is challenging. Researchers used two-molecule force spectroscopy to analyze two parallel streptavidin-biotin bonds, finding they rupture independently and with increased force.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Biological processes often involve the rupture of multiple or multivalent ligand-receptors.
  • Studying these interactions is difficult due to challenges in engineering well-controlled systems.

Purpose of the Study:

  • To investigate the rupture of two parallelly arranged monomeric streptavidin (mSA)-biotin complexes using two-molecule force spectroscopy.
  • To develop a method for unambiguously identifying rupture events of parallel ligand-receptor complexes.

Main Methods:

  • Engineered a 'molecular twin' of biotin with two biotins in parallel using SpyCatcher-SpyTag chemistry.
  • Constructed parallel mSA-biotin complexes by reacting mSA with twin biotin.
  • Incorporated single molecule fingerprint domains for unambiguous event identification in force spectroscopy.

Main Results:

  • The rupture force of the parallel dimer mSA-biotin was 172 pN at a pulling speed of 400 nm/s.
  • This force is approximately 1.6 times that of a single mSA-biotin complex (105 pN).
  • The two mSA-biotin complexes behaved as non-interacting, independent receptors.

Conclusions:

  • The demonstrated strategy enables rigorous investigation of multiple parallel ligand-receptor ruptures.
  • This approach can be extended to other ligand-receptor systems.
  • Findings provide insights into the mechanics of multivalent interactions and can test theoretical models.