Analysis Interactions of Small Molecule–Aptamer by Microscale Thermophoresis (MST) (CAT#: STEM-MB-2428-LGZ)

Introduction

Aptamers are efficient multifunctional binding molecules that can recognize various types of target molecules. Even challenging targets, such as small molecules, can be recognized and bound by aptamers. However, due to the lack of mature analytical methods, it is difficult to study the interactions between aptamers and drugs, antibiotics or metabolites in detail. Fundamental binding parameters of these small molecule-aptamer interactions, such as binding affinity, stoichiometry, and thermodynamics, were carefully obtained using state-of-the-art techniques. The innovative microscale thermophoresis (MST) is a novel, rapid and precise method to characterize these small molecule-aptamer interactions in solutions at the microliter scale.

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Principle Applications Procedure Materials Notes Related Products

Principle

One of the interacting molecules (mostly proteins) is labeled with fluorescent dye or combined with GFP label. The labeled protein and ligand molecules are placed in the capillary according to a specific concentration gradient. Infrared laser heating generates a microscopic temperature gradient field to undergo thermophoresis, with which the hydration layer, molecular size, electric charge and other molecular properties will change. Then the fluorescence distribution in the reaction system changes. In addition to accurately detecting interactions between biomolecules, MST can also obtain other parameters related to interactions between biomolecules by calculating dissociation constants (Ks), and achieve accurate qualitative analysis.

Applications

For characterizing thermodynamic parameters of biomolecular interactions.

Procedure

1. Sample processing.
2. MST detection.
3. Data analysis.

Materials

• Sample Type: protein 10uM/ 100ul or 50 micrograms, small molecules 100uM/200ul, protein peptides need to be sent at low temperature

Notes

In order to ensure the reliability of the test, some samples should be provided as much as possible.

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