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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Use of Microscale Thermophoresis to Measure Protein-Lipid Interactions
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Development of an EPR-based methodology to study protein-lipid interaction.

Clara Piersson1, Shikhar Prakash2, Victoria Lublin1

  • 1Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, IECB, F-33600 Pessac, France.

Biophysical Chemistry
|November 19, 2025
PubMed
Summary

This study introduces a new method using continuous-wave Electron Paramagnetic Resonance (CW-EPR) spectroscopy to precisely measure protein-lipid interactions. The technique quantifies bound protein and binding affinity, offering valuable insights into cellular processes.

Keywords:
Binding affinityEPR spectroscopyProtein-membrane interactionTau protein

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Area of Science:

  • Biophysics
  • Biochemistry
  • Neuroscience

Background:

  • Protein-lipid interactions are crucial for cellular functions and protein regulation.
  • Studying these interactions is challenging due to membrane complexity.
  • Existing methods have limitations in characterizing protein-membrane binding.

Purpose of the Study:

  • To present a robust methodology using CW-EPR spectroscopy for characterizing protein-membrane interactions.
  • To investigate the interaction of the Tau protein with lipids.
  • To quantify binding parameters and protein concentrations.

Main Methods:

  • Utilized continuous-wave Electron Paramagnetic Resonance (CW-EPR) spectroscopy.
  • Applied CW-EPR to study labelled Tau protein interaction with lipids.
  • Developed a minimal-data approach for estimating binding constants from single EPR measurements.

Main Results:

  • Demonstrated that labelled Tau-lipid interactions produce a distinct EPR lineshape.
  • Showed that this lineshape allows quantification of bound protein fraction.
  • Obtained apparent binding modes, affinities, and absolute concentrations of free and bound protein.

Conclusions:

  • The developed CW-EPR methodology provides a robust way to characterize protein-membrane interactions.
  • The method offers quantitative insights into binding parameters, including absolute concentrations.
  • This approach is applicable to Tau-membrane interactions and potentially other protein systems.