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Related Concept Videos

Atomic Force Microscopy01:08

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Related Experiment Video

Updated: May 1, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

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Single molecule binding dynamics measured with atomic force microscopy.

M H van Es1, J Tang2, J Preiner3

  • 1Kamerlingh Onnes Laboratory, Leiden University, 2300 RA, Leiden, The Netherlands.

Ultramicroscopy
|March 25, 2014
PubMed
Summary
This summary is machine-generated.

We developed a new method using Topography and Recognition Atomic Force Microscopy (TREC-AFM) to measure single protein binding rates. This technique accurately determines molecular binding kinetics, matching traditional biochemical assays.

Keywords:
AFMBinding kineticsInteractionSimultaneous Topography and RECognition ImagingSingle molecule

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Area of Science:

  • Biophysics
  • Surface Science
  • Biochemistry

Background:

  • Measuring single molecule binding rates is crucial for understanding protein interactions.
  • Atomic Force Microscopy (AFM) offers high resolution for surface analysis.
  • Existing methods may lack precision in determining kinetic parameters.

Purpose of the Study:

  • To introduce a novel method for analyzing simultaneous Topography and Recognition Atomic Force Microscopy (TREC-AFM) data.
  • To enable the measurement of single molecule binding rates for surface-bound proteins.
  • To validate the method using a well-defined model system.

Main Methods:

  • Simultaneous acquisition of topography and recognition data using AFM.
  • Utilizing a model system with S-layer surface, Strep-tagII, strep-tactin, and a Poly-Ethylene-Glycol (PEG) linker.
  • Analyzing binding events at the single-molecule level.

Main Results:

  • The binding rate is influenced by linker dynamics at larger distances.
  • At distances below 3 nm, binding rate is determined by intrinsic molecular properties, surface geometry, and chemistry.
  • The association rate constant (Kon) determined by TREC-AFM agrees with traditional biochemical methods.

Conclusions:

  • The developed TREC-AFM method provides accurate measurements of single molecule binding rates.
  • This technique is valuable for characterizing molecular interactions at the nanoscale.
  • The findings contribute to a deeper understanding of protein-surface interactions and binding kinetics.