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Issue 28, 2015
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Imaging phase separation in model lipid membranes through the use of BODIPY based molecular rotors

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Abstract

In order to fully understand the dynamics of processes within biological lipid membranes, it is necessary to possess an intimate knowledge of the physical state and ordering of lipids within the membrane. Here we report the use of three molecular rotors based on meso-substituted boron-dipyrrin (BODIPY) in combination with fluorescence lifetime spectroscopy to investigate the viscosity and phase behaviour of model lipid bilayers. In phase-separated giant unilamellar vesicles, we visualise both liquid-ordered (Lo) and liquid-disordered (Ld) phases using fluorescence lifetime imaging microscopy (FLIM), determining their associated viscosity values, and investigate the effect of composition on the viscosity of these phases. Additionally, we use molecular dynamics simulations to investigate the orientation of the BODIPY probes within the bilayer, as well as using molecular dynamics simulations and fluorescence correlation spectroscopy (FCS) to compare diffusion coefficients with those predicted from the fluorescence lifetimes of the probes.

Graphical abstract: Imaging phase separation in model lipid membranes through the use of BODIPY based molecular rotors

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Publication details

The article was received on 02 Apr 2015, accepted on 16 Jun 2015 and first published on 16 Jun 2015


Article type: Paper
DOI: 10.1039/C5CP01937K
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Citation: Phys. Chem. Chem. Phys., 2015,17, 18393-18402
  • Open access: Creative Commons BY license
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    Imaging phase separation in model lipid membranes through the use of BODIPY based molecular rotors

    M. R. Dent, I. López-Duarte, C. J. Dickson, N. D. Geoghegan, J. M. Cooper, I. R. Gould, R. Krams, J. A. Bull, N. J. Brooks and M. K. Kuimova, Phys. Chem. Chem. Phys., 2015, 17, 18393
    DOI: 10.1039/C5CP01937K

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