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Dynamic clustered distribution of hemagglutinin resolved at 40 nm in living cell membranes discriminates between raft theories
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Dynamic clustered distribution of hemagglutinin resolved at 40 nm in living cell membranes discriminates between raft theories
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Journal Article
Dynamic clustered distribution of hemagglutinin resolved at 40 nm in living cell membranes discriminates between raft theories
2007
Overview
Organization in biological membranes spans many orders of magnitude in length scale, but limited resolution in far-field light microscopy has impeded distinction between numerous biomembrane models. One canonical example of a heterogeneously distributed membrane protein is hemagglutinin (HA) from influenza virus, which is associated with controversial cholesterol-rich lipid rafts. Using fluorescence photoactivation localization microscopy, we are able to image distributions of tens of thousands of HA molecules with subdiffraction resolution ([almost equal to]40 nm) in live and fixed fibroblasts. HA molecules form irregular clusters on length scales from [almost equal to]40 nm up to many micrometers, consistent with results from electron microscopy. In live cells, the dynamics of HA molecules within clusters is observed and quantified to determine an effective diffusion coefficient. The results are interpreted in terms of several established models of biological membranes.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
