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Sensing Protein Structural Transitions with Microfluidic Modulation Infrared Spectroscopy.

Lathan Lucas1, Phoebe S Tsoi1, Ananya Nair1,2

  • 1Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA.

Biosensors
|June 25, 2025
PubMed
Summary
This summary is machine-generated.

Microfluidic modulation spectroscopy-infrared (MMS) accurately quantifies protein structures in solution. This method reveals how environmental factors and aggregation affect protein folding, aiding disease research.

Keywords:
aggregationinfrared spectroscopyintrinsically disordered proteinsmicrofluidicsprotein secondary structurestructural transitionstau

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Area of Science:

  • Biophysical Chemistry
  • Spectroscopy
  • Protein Science

Background:

  • Protein secondary structure analysis is crucial for understanding protein function and misfolding.
  • Existing methods often require labeling or large sample volumes.
  • A label-free, high-sensitivity technique for native conditions is needed.

Purpose of the Study:

  • To validate microfluidic modulation spectroscopy-infrared (MMS) for protein secondary structure analysis.
  • To investigate environmental and phosphorylation effects on Tau protein structure.
  • To monitor protein aggregation using MMS.

Main Methods:

  • Microfluidic modulation spectroscopy-infrared (MMS) was employed.
  • The technique involves alternating sample and buffer flow for background subtraction.
  • Spectra were analyzed for α-helix, β-sheet, and turn/unordered structures.

Main Results:

  • MMS accurately resolved secondary structures in globular proteins (BSA, mCherry, lysozyme).
  • Environmental pH changes and Tau hyperphosphorylation altered Tau protein conformers.
  • MMS distinguished monomeric Tau from aggregated amyloid fibrils, showing increased β-sheet content in aggregates.

Conclusions:

  • MMS is a robust platform for label-free protein secondary structure detection in solution.
  • The method effectively monitors structural transitions in both folded and intrinsically disordered proteins.
  • MMS has potential for studying misfolding mechanisms and aggregation-related diseases.