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A simple quantitative method to study protein-lipopolysaccharide interactions by using liquid crystals.

Dibyendu Das1, Sumyra Sidiq, Santanu Kumar Pal

  • 1Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali (IISERM), Sector-81, SAS Nagar, Knowledge City, Manauli-140306 (India).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|January 10, 2015
PubMed
Summary

This study introduces liquid crystal (LC) materials for measuring lipopolysaccharide (LPS)-protein binding. The LC

Keywords:
interfacesliquid crystalspolymersproteinsstructure-activity relationships

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Area of Science:

  • Materials Science
  • Biochemistry
  • Analytical Chemistry

Background:

  • Protein-lipopolysaccharide (LPS) interactions influence biological responses and have clinical relevance.
  • Understanding these interactions is crucial for developing new therapeutic and diagnostic tools.
  • Existing methods for studying LPS-protein binding can be complex and lack quantitative precision.

Purpose of the Study:

  • To develop a novel stimuli-responsive soft material based on liquid crystals (LCs) for quantitative measurement of LPS-protein binding events.
  • To investigate the interfacial ordering transitions of LCs induced by protein-LPS interactions.
  • To establish a facile method for tuning LPS-induced responses by manipulating protein-LPS binding affinity.

Main Methods:

  • Utilized micrometer-thick films of liquid crystals (LCs) as a platform for interfacial measurements.
  • Investigated the optical response (ordering transition from dark to bright) of LCs upon contact with LPS-aqueous interfaces and various proteins (hemoglobin, bovine serum albumin, lysozyme).
  • Measured optical retardation of 4'-pentyl-4-cyanobiphenyl (5CB) LC to determine binding affinities.

Main Results:

  • LC films exhibited distinct optical ordering transitions when exposed to different LPS-protein complexes.
  • The binding affinity of proteins to LPS was quantified and correlated with the observed LC responses, showing highest affinity for LPS-hemoglobin, followed by LPS-bovine serum albumin, and least for LPS-lysozyme.
  • The results demonstrate a direct correlation between protein-LPS binding strength and the magnitude of the LC's optical response.

Conclusions:

  • Liquid crystal-based soft materials offer a sensitive and quantitative method for measuring LPS-protein binding events.
  • The observed interfacial ordering transitions provide a visual and measurable output for binding affinity.
  • This approach has potential for developing general, facile, and multiplexed assays for studying endotoxin-protein interactions.