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Updated: Jan 27, 2026

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Evaluation of Interbilayer and Transbilayer Transfer Dynamics of Phospholipids Using Time-Resolved Small-Angle
1Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama.
Abstract:
The bilayer structure of biomembranes consists of thousands of lipids, the composition of which is different for each organelle. Since most lipids are synthesized in the endoplasmic reticulum, subsequent distribution to each organelle determines the composition and function of the biomembranes. Thus, interbilayer transfer and transbilayer movement (flip-flop) of phospholipids play important roles in maintaining homeostasis. A crucial task in biophysics and cell biology is to understand how rapidly lipids migrate between bilayers spontaneously or through proteins and to control these lipid dynamics. Time-resolved small-angle neutron scattering (TR-SANS) is a powerful technique to determine the intervesicular exchange and flip-flop rates of lipids in situ and real time. In this review, I explain how TR-SANS detects the interbilayer and transbilayer transfer of phospholipids and introduce recent progress of my group on the evaluation of spontaneous and protein- (or peptide-)mediated lipid transfer in several phospholipid dispersion systems.
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