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3 Janelia Publications

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    01/26/14 | Correlative super-resolution fluorescence and metal-replica transmission electron microscopy.
    Sochacki KA, Shtengel G, Van Engelenburg SB, Hess HF, Taraska JW
    Nature Methods. 2014 Jan 26;11(3):305-8. doi: 10.1038/nmeth.2816

    We combine super-resolution localization fluorescence microscopy with transmission electron microscopy of metal replicas to locate proteins on the landscape of the cellular plasma membrane at the nanoscale. We validate robust correlation on the scale of 20 nm by imaging endogenous clathrin (in two and three dimensions) and apply the method to find the previously unknown three-dimensional position of the endocytic protein epsin on clathrin-coated structures at the plasma membrane.

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    01/16/14 | Distribution of ESCRT machinery at HIV assembly sites reveals virus scaffolding of ESCRT subunits.
    Van Engelenburg SB, Shtengel G, Sengupta P, Waki K, Jarnik M, Ablan SD, Freed EO, Hess HF, Lippincott-Schwartz J
    Science. 2014 Jan 16;343(6171):653-6. doi: 10.1126/science.1247786

    The human immunodeficiency virus (HIV) hijacks the endosomal sorting complexes required for transport (ESCRT) to mediate virus release from infected cells. The nanoscale organization of ESCRT machinery necessary for mediating viral abscission is unclear. Here, we applied three-dimensional superresolution microscopy and correlative electron microscopy to delineate the organization of ESCRT components at HIV assembly sites. We observed ESCRT subunits localized within the head of budding virions and released particles, with head-localized levels of CHMP2A decreasing relative to Tsg101 and CHMP4B upon virus abscission. Thus, the driving force for HIV release may derive from initial scaffolding of ESCRT subunits within the viral bud interior followed by plasma membrane association and selective remodeling of ESCRT subunits.

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    01/01/14 | Imaging cellular ultrastructure by PALM, iPALM, and correlative iPALM-EM.
    Shtengel G, Wang Y, Zhang Z, Goh WI, Hess HF, Kanchanawong P
    Methods in Cell Biology. 2014;123:273-94. doi: 10.1016/B978-0-12-420138-5.00015-X

    Many biomolecules in cells can be visualized with high sensitivity and specificity by fluorescence microscopy. However, the resolution of conventional light microscopy is limited by diffraction to ~200-250nm laterally and >500nm axially. Here, we describe superresolution methods based on single-molecule localization analysis of photoswitchable fluorophores (PALM: photoactivated localization microscopy) as well as our recent three-dimensional (3D) method (iPALM: interferometric PALM) that allows imaging with a resolution better than 20nm in all three dimensions. Considerations for their implementations, applications to multicolor imaging, and a recent development that extend the imaging depth of iPALM to ~750nm are discussed. As the spatial resolution of superresolution fluorescence microscopy converges with that of electron microscopy (EM), direct imaging of the same specimen using both approaches becomes feasible. This could be particularly useful for cross validation of experiments, and thus, we also describe recent methods that were developed for correlative superresolution fluorescence and EM.

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