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Related Experiment Videos

Following aptamer-thrombin binding by force measurements.

Bernhard Basnar1, Roey Elnathan, Itamar Willner

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Analytical Chemistry
|June 2, 2006
PubMed
Summary

The rupture force of a single aptamer-thrombin complex was measured at 4.45 pN. This force is attributed to the melting of the aptamer's G-quadruplex structure, causing complex dissociation.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Aptamers are crucial in molecular recognition and diagnostics.
  • Thrombin is a key protein in blood coagulation.
  • Atomic Force Microscopy (AFM) enables single-molecule force measurements.

Purpose of the Study:

  • To quantify the rupture forces between aptamer-functionalized AFM tips and thrombin.
  • To elucidate the molecular mechanism underlying aptamer-thrombin complex dissociation.
  • To investigate the role of the aptamer's G-quadruplex structure in binding stability.

Main Methods:

  • Functionalization of an AFM tip with aptamers.
  • Modification of a gold (Au) surface with thrombin.
  • Atomic Force Microscopy (AFM) to measure single-molecule rupture forces.

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Main Results:

  • The rupture force for a single aptamer/thrombin complex was determined to be approximately 4.45 pN.
  • Rupture forces directly correlate with the melting of the aptamer's G-quadruplex structure.
  • Melting of the G-quadruplex structure leads to the dissociation of the aptamer-thrombin complex.

Conclusions:

  • The study quantifies the binding strength of aptamer-thrombin interactions at the single-molecule level.
  • The G-quadruplex structure is critical for the stability of aptamer-thrombin binding.
  • AFM force measurements provide insights into the dissociation mechanisms of aptamer-based biosensors.