Identification of Multivesicular Bodies as Prevacuolar Compartments in<i>Nicotiana tabacum</i>BY-2 Cells[W]

DOI PDF 被引用文献19件
  • Yu Chung Tse
    Department of Biology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • Beixin Mo
    Department of Biology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • Stefan Hillmer
    Department of Cell Biology, Heidelberg Institute for Plant Sciences, University of Heidelberg, D-69120 Heidelberg, Germany
  • Min Zhao
    Department of Biology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • Sze Wan Lo
    Department of Biology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • David G. Robinson
    Department of Cell Biology, Heidelberg Institute for Plant Sciences, University of Heidelberg, D-69120 Heidelberg, Germany
  • Liwen Jiang
    Department of Biology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China

説明

<jats:title>Abstract</jats:title><jats:p>Little is known about the dynamics and molecular components of plant prevacuolar compartments (PVCs). We have demonstrated recently that vacuolar sorting receptor (VSR) proteins are concentrated on PVCs. In this study, we generated transgenic Nicotiana tabacum (tobacco) BY-2 cell lines expressing two yellow fluorescent protein (YFP)-fusion reporters that mark PVC and Golgi organelles. Both transgenic cell lines exhibited typical punctate YFP signals corresponding to distinct PVC and Golgi organelles because the PVC reporter colocalized with VSR proteins, whereas the Golgi marker colocalized with mannosidase I in confocal immunofluorescence. Brefeldin A induced the YFP-labeled Golgi stacks but not the YFP-marked PVCs to form typical enlarged structures. By contrast, wortmannin caused YFP-labeled PVCs but not YFP-labeled Golgi stacks to vacuolate. VSR antibodies labeled multivesicular bodies (MVBs) on thin sections prepared from high-pressure frozen/freeze substituted samples, and the enlarged PVCs also were indentified as MVBs. MVBs were further purified from BY-2 cells and found to contain VSR proteins via immunogold negative staining. Similar to YFP-labeled Golgi stacks, YFP-labeled PVCs are mobile organelles in BY-2 cells. Thus, we have unequivocally identified MVBs as PVCs in N. tabacum BY-2 cells. Uptake studies with the styryl dye FM4-64 strongly indicate that PVCs also lie on the endocytic pathway of BY-2 cells.</jats:p>

収録刊行物

  • The Plant Cell

    The Plant Cell 16 (3), 672-693, 2004-03-01

    Oxford University Press (OUP)

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