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By S. Najman

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Bars, 500 nm. In cross sections, these annuli display a profile of about the same size as pore channels of nuclear pores. , 1981). Taken together, conventional TEM allows the identification of AL by morphological criteria. ALPCs are frequently densely packed thereby covering most of the membrane surface. This is particularly true for AL stacks of amphibian oocytes, as demonstrated in Fig. 3 representing a surface view on AL by scanning electron microscopy. Kessel (1989) described such an optimal use of membrane space by ALPCs as a tight hexagonal package.

This central tube is lined and filled by a subset of NUPs containing phenylalanine-glycine (FG) repeat motives which are crucial for the translocation of cargo. The FG NUPs comprise centrally-located constituents (Nup98, Nup62, Nup54, Nup45, Nup48), as well as cytoplasmic (Nup358, Nup214, Nlp1) and nucleoplasmic constituents (Nup153, Tpr). The tube made from FG NUPs is confined by nucleoplasmic and cytoplasmic NUP-containing rings that form a core scaffold. The asymmetry in the composition of nucleoplasmic and cytoplasmic ring structures finds its continuity in filaments that extend towards the nucleoplasm and the cytoplasm.

The driving Tubulohelical Membrane Arrays, Annulate Lamellae and Nuclear Pores: Tripartite Membrane Architecture with the Participation of Nucleoporins 33 force for the transport is the hydrolysis of GTP by the GTPase Ran, which is maintained via a nucleocytoplasmic gradient between the two conformations, Ran-GTP and Ran-GDP (for details see: Wente & Rout, 2010). Since it turned out that nucleoporins also play critical roles in chromatin organization and gene regulation, NPCs are also under scrutiny for novel, related functions besides nucleocytoplasmic transport (Liang & Hetzer, 2011).

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