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PRODAN differentially influences its local environment.

Adam Suhaj1, Alix Le Marois, David J Williamson

  • 1Department of Physics and Randall Division of Cell and Molecular Biophysics, King's College London, London, UK. adam.suhaj@kcl.ac.uk.

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Summary
This summary is machine-generated.

Environmentally-sensitive dyes like PRODAN alter cell membrane properties. PRODAN affects lipid order differently in simulated versus experimental systems, highlighting the need to understand dye-membrane interactions.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Biophysics

Background:

  • Cellular membranes exhibit distinct liquid-ordered (Lo) and liquid-disordered (Ld) phases.
  • Environmentally-sensitive dyes are crucial for studying these membrane phases.
  • The impact of dye insertion on membrane properties remains incompletely understood.

Purpose of the Study:

  • To investigate the effects of PRODAN dye insertion on the local environment of lipid bilayers.
  • To compare simulation results with experimental observations regarding PRODAN's influence on membrane properties.

Main Methods:

  • Molecular dynamics (MD) simulations of PRODAN interacting with lipid bilayers.
  • Fluorescence microscopy to measure Generalized Polarization (GP) values in vesicles and HeLa cells.
  • Analysis of lipid order and hydration in response to varying PRODAN concentrations.

Main Results:

  • MD simulations showed PRODAN lowered lipid order in Ld phases and increased it in Lo phases.
  • Experimental data indicated PRODAN significantly decreased lipid order in both phases, even at low concentrations.
  • Discrepancies suggest differences in dye localization and hydration effects between simulation and experiment.

Conclusions:

  • PRODAN's presence influences membrane lipid order and local hydration.
  • Observed discrepancies between simulation and experiment highlight the complexity of dye-membrane interactions.
  • Further research is needed to elucidate dye localization and its impact on membrane dynamics.