Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 104, Issue 44, Pages 17370-17375Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0708066104
Keywords
hemagglutinin; microdomains; fluorescence photoactivation localization microscopy photoactivation; rafts
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Funding
- Intramural NIH HHS Funding Source: Medline
- NIAID NIH HHS [K25AI65459, K25 AI065459] Funding Source: Medline
- NICHD NIH HHS [T32 HD007065] Funding Source: Medline
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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 (approximate to 40 nm) in live and fixed fibroblasts. HA molecules form irregular clusters on length scales from approximate 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.
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