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Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

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Protein-Small Molecule Interactions by WaterLOGSY.

Renjie Huang¹, Ivanhoe K H Leung¹

¹School of Chemical Sciences, The University of Auckland, Auckland, New Zealand.

Methods in Enzymology

|January 15, 2019

Summary

This summary is machine-generated.

WaterLOGSY is a nuclear magnetic resonance (NMR) method for studying protein-small molecule interactions. This technique efficiently screens for protein ligands and determines binding affinity (K_D), offering insights into ligand binding orientation.

Keywords:

Binding affinity Protein–ligand interactions Screening Water accessibility WaterLOGSY

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Area of Science:

Biochemistry
Chemical Biology
Structural Biology

Background:

Protein-small molecule interactions are crucial in biological processes.
Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for studying these interactions.
Ligand-observed NMR methods offer specific advantages for probing binding events.

Purpose of the Study:

To introduce and describe the WaterLOGSY (Water-Ligand Observed via Gradient Spectroscopy) method.
To provide a practical guide for utilizing WaterLOGSY in ligand screening and binding affinity (K_D) determination.
To discuss the application of WaterLOGSY in identifying water-accessible ligand protons for structural insights.

Main Methods:

WaterLOGSY utilizes magnetization transfer between water, proteins, and small molecules.
The method relies on nuclear Overhauser effect (NOE) and chemical exchange principles.
Experimental procedures for ligand screening and K_D determination using WaterLOGSY are detailed.

Main Results:

WaterLOGSY is a robust, high-throughput method for identifying protein ligands with K_D in the μM to mM range.
The method allows for K_D determination via ligand titration, with a note on experimental optimization.
WaterLOGSY can identify water-accessible protons of bound ligands, providing orientation information.

Conclusions:

WaterLOGSY is a versatile NMR technique for the characterization of protein-small molecule interactions.
It serves as an effective tool for both screening potential ligands and quantifying binding affinities.
The method provides valuable structural information regarding ligand binding modes.