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Cytoplasmic Capes Are Nuclear Envelope Intrusions That Are Enriched in Endosomal Proteins and Depend upon βH-Spectrin and Annexin B9

Authors: Wu, Juan; Bakerink, Katelyn J.; Evangelista, Meagan E.; Thomas, Graham H.;

Cytoplasmic Capes Are Nuclear Envelope Intrusions That Are Enriched in Endosomal Proteins and Depend upon βH-Spectrin and Annexin B9

Abstract

It is increasingly recognized that non-erythroid spectrins have roles remote from the plasma membrane, notably in endomembrane trafficking. The large spectrin isoform, βH, partners with Annexin B9 to modulate endosomal processing of internalized proteins. This modulation is focused on the early endosome through multivesicular body steps of endocytic processing and loss of either protein appears to cause a traffic jam before removal of ubiquitin at the multivesicular body. We previously reported that βH/Annexin B9 influenced EGF receptor signaling. While investigating this effect we noticed that mSptiz, the membrane bound precursor of the secreted EGF receptor ligand sSpitz, is located in striking intrusions of the nuclear membrane. Here we characterize these structures and identify them as 'cytoplasmic capes', which were previously identified in old ultrastructural studies and probably coincide with recently recognized sites of non-nuclear-pore RNA export. We show that cytoplasmic capes contain multiple endosomal markers and that their existence is dependent upon βH and Annexin B9. Diminution of these structures does not lead to a change in mSpitz processing. These results extend the endosomal influence of βH and its partner Annexin B9 to this unusual compartment at the nuclear envelope.

Related Organizations
Keywords

Cell Physiology, 570, Arthropoda, Annexins, Nuclear Envelope, Science, Endosomes, Epithelium, Mice, Model Organisms, Molecular Cell Biology, Genetics, Animals, Drosophila Proteins, Cytoskeleton, Cell Nucleus, Epidermal Growth Factor, Drosophila Melanogaster, Q, Organisms, R, Biology and Life Sciences, Membrane Proteins, Spectrin, Epithelial Cells, Cell Biology, Animal Models, 540, Invertebrates, Insects, Protein Transport, Biological Tissue, Membrane Trafficking, Microscopy, Electron, Scanning, Medicine, Cytoplasmic Structures, Drosophila, Anatomy, Cellular Structures and Organelles, Cellular Types, Gene Function, Signal Transduction, Research Article

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Average
Average
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gold