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Assay of Lipid Mixing and Fusion Pore Formation in the Fusion of Yeast Vacuoles.
Fluorescence de-quenching can be used to analyze membrane lipid mixing during an in vitro fusion reaction. Here we describe a method to measure lipid mixing using vacuolar membranes purified from the yeast Saccharomyces cerevisiae. Labeling the isolated organelles with rhodamine-phosphatidylethanolamine allows to reveal ATP-dependent lipid mixing through fluorescence de-quenching in a spectrofluorometer. Combining this assay with content mixing indicators, such as the fusion-dependent maturation of a luminal vacuolar phosphatase, then permits the detection of hemifusion intermediates and the analysis of the requirements for fusion pore opening.
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