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Membrane Remodeling of Giant Vesicles in Response to Localized Calcium Ion Gradients
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Sensing small molecule interactions with lipid membranes by local pH modulation.

Da Huang1, Tao Zhao, Wei Xu

  • 1Department of Chemistry and §Department of Biochemistry and Molecular Biology, Penn State University , University Park, PA 16802.

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Summary

This study introduces a pH modulation sensor to detect interactions between the local anesthetic tetracaine and lipid bilayers. The platform offers a sensitive, rapid, and cost-effective method for drug development screening.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Materials Science

Background:

  • Understanding drug-lipid bilayer interactions is crucial for drug development.
  • Supported lipid bilayers (SLBs) are valuable models for cell membranes.
  • Label-free detection methods are desirable for studying molecular interactions.

Purpose of the Study:

  • To develop and validate a pH modulation-based sensing platform for detecting interactions between small molecules and lipid bilayers.
  • To investigate the binding affinity of tetracaine, a local anesthetic, to various supported lipid bilayer compositions.
  • To compare the performance of the pH modulation sensor with established techniques like isothermal titration calorimetry (ITC).

Main Methods:

  • Utilized a label-free sensing platform based on pH modulation.
  • Patterned supported lipid bilayers (SLBs) within a flow cell.
  • Introduced varying concentrations of tetracaine in a buffer solution over the SLBs.
  • Quantified interactions using equilibrium dissociation constant (Kd) measurements.
  • Compared results with isothermal titration calorimetry (ITC) data.

Main Results:

  • Determined an equilibrium dissociation constant (Kd) of 180 ± 47 μm for tetracaine interaction with POPC membranes.
  • Observed decreased affinity with cholesterol incorporation and increased affinity with POPE incorporation into SLBs.
  • Demonstrated significant binding affinity enhancement with negatively charged lipids (POPG, POPS, GM1), attributed to electrostatic interactions.
  • Validated the pH modulation sensor's performance against ITC measurements.

Conclusions:

  • The pH modulation sensor platform provides a facile, inexpensive, highly sensitive, and rapid method for detecting drug-lipid bilayer interactions.
  • This technique shows potential for use as a screening tool in drug development and analysis.
  • The study highlights the influence of lipid composition and charge on the interaction dynamics of small molecules with membranes.