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    The Protein Storage Vacuole: A Unique Compound Organelle

    Jiang, Liwen
    Phillips, Thomas
    Hamm, Christopher A.
    Drozdowicz, Yolanda M.
    Rea, Philip A.
    Maeshima, Masayoshi
    Rogers, Sally W.
    Rogers, John C., 1949-
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    [PDF] ProteinStorageVacuole.pdf (828.4Kb)
    Date
    2001
    Format
    Article
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    Abstract
    Storage proteins are deposited into protein storage vacuoles (PSVs) during plant seed development and maturation and stably accumulate to high levels; subsequently, during germination the storage proteins are rapidly degraded to provide nutrients for use by the embryo. Here, we show that a PSV has within it a membrane-bound compartment containing crystals of phytic acid and proteins that are characteristic of a lytic vacuole. This compound organization, a vacuole within a vacuole whereby storage functions are separated from lytic functions, has not been described previously for organelles within the secretory pathway of eukaryotic cells. The partitioning of storage and lytic functions within the same vacuole may reflect the need to keep the functions separate during seed development and maturation and yet provide a ready source of digestive enzymes to initiate degradative processes early in germination.
    URI
    http://hdl.handle.net/10355/8613
    Part of
    Biological Sciences publications (MU)
    Citation
    The Journal of Cell Biology, Volume 155, Number 6, December 10, 2001, 991-1002.
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    • Biological Sciences publications (MU)

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