Targeting of Nbp1 to the inner nuclear membrane is essential for spindle pole body duplication
Spindle pole bodies (SPBs), like nuclear pore complexes, are embedded in the nuclear envelope (NE) at sites of fusion of the inner and outer nuclear membranes. A network of interacting proteins is required to insert a cytoplasmic SPB precursor into the NE. A central player of this network is Nbp1 th...
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| Hauptverfasser: | , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
22 July 2011
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| In: |
The EMBO journal
Year: 2011, Jahrgang: 30, Heft: 16, Pages: 3337-3352 |
| ISSN: | 1460-2075 |
| DOI: | 10.1038/emboj.2011.242 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/emboj.2011.242 Verlag, lizenzpflichtig, Volltext: https://www.embopress.org/doi/full/10.1038/emboj.2011.242 
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| Verfasserangaben: | Thomas Kupke, Leontina Di Cecco, Hans-Michael Müller, Annett Neuner, Frank Adolf, Felix Wieland, Walter Nickel and Elmar Schiebel |
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| 520 | |a Spindle pole bodies (SPBs), like nuclear pore complexes, are embedded in the nuclear envelope (NE) at sites of fusion of the inner and outer nuclear membranes. A network of interacting proteins is required to insert a cytoplasmic SPB precursor into the NE. A central player of this network is Nbp1 that interacts with the conserved integral membrane protein Ndc1. Here, we establish that Nbp1 is a monotopic membrane protein that is essential for SPB insertion at the inner face of the NE. In vitro and in vivo studies identified an N-terminal amphipathic α-helix of Nbp1 as a membrane-binding element, with crucial functions in SPB duplication. The karyopherin Kap123 binds to a nuclear localization sequence next to this amphipathic α-helix and prevents unspecific tethering of Nbp1 to membranes. After transport into the nucleus, Nbp1 binds to the inner nuclear membrane. These data define the targeting pathway of a SPB component and suggest that the amphipathic α-helix of Nbp1 is important for SPB insertion into the NE from within the nucleus. | ||
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