Understanding the effect of a solid support on the dynamical properties of a supported lipid bilayer (SLB) is a prerequisite for the applications of SLB as a model biomembrane. Here, we applied two-dimensional fluorescence lifetime correlation spectroscopy to examine the effect of solution pH on the diffusion of lipids in the proximal/distal leaflets of a zwitterionic SLB. Leaflet-specific diffusion analyses at various pH revealed that the diffusion of lipids in the proximal leaflet facing a glass surface becomes slower by decreasing pH with the transition pH of ∼7.4. We attributed it to the reduction of the surface charge density of a glass support. Furthermore, the data clearly showed that the lipid diffusion in the distal leaflet facing a bulk solution is insensitive to the change in the diffusion property of the proximal leaflet. This reflects a weak interleaflet coupling between the proximal and distal leaflets of the SLB.
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14 July 2019
Research Article|
July 12 2019
Reduction of glass-surface charge density slows the lipid diffusion in the proximal leaflet of a supported lipid bilayer
Takuhiro Otosu
Shoichi Yamaguchi
a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 151, 025102 (2019)
Article history
Received:
April 25 2019
Accepted:
June 24 2019
Citation
Takuhiro OtosuShoichi Yamaguchi; Reduction of glass-surface charge density slows the lipid diffusion in the proximal leaflet of a supported lipid bilayer. J. Chem. Phys. 14 July 2019; 151 (2): 025102. https://doi.org/10.1063/1.5103221
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