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Related Experiment Video

Updated: Apr 4, 2026

Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis
08:09

Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis

Published on: January 7, 2017

11.4K

Studying small molecule-aptamer interactions using MicroScale Thermophoresis (MST).

Clemens Entzian1, Thomas Schubert1

  • 12bind GmbH, Josef Engertstraße 13, 93053 Regensburg, Germany.

Methods (San Diego, Calif.)
|September 4, 2015
PubMed
Summary

MicroScale Thermophoresis (MST) offers a precise method to analyze small molecule-aptamer interactions, determining binding affinity and thermodynamics. This technique quantifies molecular interactions, aiding in drug discovery and understanding metabolite binding.

Keywords:
Binding parametersMicroScale Thermophoresis (MST)Small molecule–aptamer interactions

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Last Updated: Apr 4, 2026

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Aptamers are versatile molecules that bind various targets, including small molecules like drugs and metabolites.
  • Characterizing small molecule-aptamer interactions is challenging due to limitations in current analytical methods.
  • Key parameters like binding affinity, stoichiometry, and thermodynamics are difficult to ascertain.

Purpose of the Study:

  • To introduce MicroScale Thermophoresis (MST) as a novel, rapid, and precise method for analyzing small molecule-aptamer interactions.
  • To describe a protocol for obtaining quantitative binding parameters using MST.
  • To demonstrate MST's utility by mapping the binding site of an ATP aptamer.

Main Methods:

  • MicroScale Thermophoresis (MST) utilizes the movement of molecules in a temperature gradient (thermophoresis) to detect interactions.
  • Changes in thermophoretic movement, influenced by size, charge, and hydration shell, indicate molecular binding.
  • MST allows measurements in various buffers, including complex biological fluids, with a dynamic affinity range from pM to mM.

Main Results:

  • MST provides a precise and rapid method for quantifying small molecule-aptamer interactions in solution at the microscale.
  • The technique is independent of target molecule size and offers a wide dynamic affinity range.
  • The study successfully mapped the binding site of the ATP aptamer DH25.42 to the adenine region of ATP.

Conclusions:

  • MST is a powerful tool for characterizing aptamer-small molecule interactions, overcoming limitations of existing technologies.
  • The method enables detailed analysis of binding affinity, stoichiometry, and thermodynamics, crucial for drug development and biochemical research.
  • This protocol facilitates a deeper understanding of molecular recognition involving aptamers and small molecules.