Abstract
Cell membranes are composed of a large variety of lipids and proteins. While the localization and function of membrane proteins have been extensively investigated, the distribution of membrane lipids, especially in the non-cytoplasmic leaflet of organelle membranes, remains largely unknown. Fluorescent biosensors have been widely used to study membrane lipid distribution; however, they have some limitations. By utilizing the quick-freezing and freeze-fracture replica labeling electron microscopy technique, we can uncover the precise distribution of membrane lipids within cells and assess the function of lipid-transporting proteins. In this review, I summarize recent progress in analyzing intracellular lipid distribution by utilizing this method.
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