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1 Publications

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    Saalfeld LabCOSEM
    06/16/23 | Architecture and dynamics of a desmosome-endoplasmic reticulum complex.
    Bharathan NK, Giang W, Hoffman CL, Aaron JS, Khuon S, Chew T, Preibisch S, Trautman ET, Heinrich L, Bogovic J, Bennett D, Ackerman D, Park W, Petruncio A, Weigel AV, Saalfeld S, COSEM Project Team , Wayne Vogl A, Stahley SN, Kowalczyk AP
    Nature Cell Biology. 2023 Jun 16;25(6):823-835. doi: 10.1038/s41556-023-01154-4

    The endoplasmic reticulum (ER) forms a dynamic network that contacts other cellular membranes to regulate stress responses, calcium signalling and lipid transfer. Here, using high-resolution volume electron microscopy, we find that the ER forms a previously unknown association with keratin intermediate filaments and desmosomal cell-cell junctions. Peripheral ER assembles into mirror image-like arrangements at desmosomes and exhibits nanometre proximity to keratin filaments and the desmosome cytoplasmic plaque. ER tubules exhibit stable associations with desmosomes, and perturbation of desmosomes or keratin filaments alters ER organization, mobility and expression of ER stress transcripts. These findings indicate that desmosomes and the keratin cytoskeleton regulate the distribution, function and dynamics of the ER network. Overall, this study reveals a previously unknown subcellular architecture defined by the structural integration of ER tubules with an epithelial intercellular junction.

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