By Jeno Bernath
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Extra resources for Poppy: The Genus Papaver
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Eur J Cell Biol 96:11–23 Tomita K, Cooper JP (2006) The meiotic chromosomal bouquet: SUN collects flowers. Cell 125:19–21 Tzur YB, Margalit A, Melamed-Book N, Gruenbaum Y (2006a) Matefin/SUN-1 is a nuclear envelope receptor for CED-4 during Caenorhabditis elegans apoptosis. Proc Natl Acad Sci USA 103:13397–13402 Tzur YB, Wilson KL, Gruenbaum Y (2006b) SUN-domain proteins: ‘Velcro’ that links the nucleoskeleton to the cytoskeleton. Nat Rev Mol Cell Biol 7:782–788 Van Damme D, Bouget FY, Van Poucke K, Inze D, Geelen D (2004) Molecular dissection of plant cytokinesis and phragmoplast structure: a survey of GFP-tagged proteins.
In the metazoan NPC, this complex, also referred to as the Nup107-160 complex, is considered to form a central scaffold of the pore required for nuclear pore assembly (Harel et al. 2003b; Walther et al. 2003a). Interestingly, while depletions of nucleoporins in this complex severely reduce the number of pores per nucleus in animal cells and mutations are often lethal, several viable Arabidopsis and lotus mutants have recently been isolated that involve plant nucleoporins putatively located within these symmetrical ring complexes (Dong et al.
2002). Initial tearing of the NE occurs on the opposite side of the nucleus where the tensile forces are at their greatest; the tearing is possibly linked to the localised disassembly of nuclear pores creating a focal point for the membrane perforation. After the initial tearing of the nuclear membrane, structure of the NE is lost rapidly. In tobacco BY-2 cells co-expressing a microtubule marker (GFP-MBD) The Plant Nuclear Envelope 21 Fig. 2 Cell cycle in BY-2 cells expressing LBR-GFP as a nuclear envelope marker.