Journal
MEMBRANES
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/membranes11050339
Keywords
lipid bilayer membrane; F-BAR protein; phosphatidylinositol; atomic force microscope; single particle tracking
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Funding
- JSPS KAKENHI [JP20H02690, JP19K15407, JP21015027]
- JST-CREST [JPMJCR14F3]
- EIIRIS Project, Toyohashi University of Technology
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This study explored the size, distribution, and fluidity of microdomains in a lipid bilayer containing phosphatidylinositol (PI), showing that PI-derived submicron domains hindered lipid diffusion. Furthermore, the PI-derived microdomain acted as a scaffold for protein adsorption during the two-dimensional assembly of a membrane deformation protein.
We characterized the size, distribution, and fluidity of microdomains in a lipid bilayer containing phosphatidylinositol (PI) and revealed their roles during the two-dimensional assembly of a membrane deformation protein (FBP17). The morphology of the supported lipid bilayer (SLB) consisting of PI and phosphatidylcholine (PC) on a mica substrate was observed with atomic force microscope (AFM). Single particle tracking (SPT) was performed for the PI+PC-SLB on the mica substrate by using the diagonal illumination setup. The AFM topography showed that PI-derived submicron domains existed in the PI+PC-SLB. The spatiotemporal dependence of the lateral lipid diffusion obtained by SPT showed that the microdomain had lower fluidity than the surrounding region and worked as the obstacles for the lipid diffusion. We observed the two-dimensional assembly of FBP17, which is one of F-BAR family proteins included in endocytosis processes and has the function generating lipid bilayer tubules in vitro. At the initial stage of the FBP17 assembly, the PI-derived microdomain worked as a scaffold for the FBP17 adsorption, and the fluid surrounding region supplied FBP17 to grow the FBP17 domain via the lateral molecular diffusion. This study demonstrated an example clearly revealing the roles of two lipid microregions during the protein reaction on a lipid bilayer.
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