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lüll Nucleocytoplasmic protein traffic and its significance to cell function Yoneda YGenes Cells 2000[Oct]; 5 (10): 777-87In eukaryotic cells, cell functions are maintained in an orderly manner through the continuous traffic of various proteins between the cell nucleus and the cytoplasm. The nuclear import and export of proteins occurs through nuclear pore complexes and typically requires specific signals: the nuclear localization signal and nuclear export signal, respectively. The transport pathways have been found to be highly divergent, but are known to be largely mediated by importin beta-like transport receptor family molecules. These receptor molecules bind to and carry their cargoes directly or via adapter molecules. A small GTPase Ran ensures the directionality of nuclear transport by regulating the interaction between the receptors and their cargoes through its GTP/GDP cycle. Moreover, it has been recently elucidated how the transport system is involved in various functions of cell physiology, such as cell cycle control.|*Active Transport, Cell Nucleus[MESH]|*Protein Transport[MESH]|Animals[MESH]|Carrier Proteins/metabolism[MESH]|Cell Cycle[MESH]|Cell Nucleus/*metabolism[MESH]|Cytoplasm/*metabolism[MESH]|Karyopherins[MESH]|Nuclear Pore/metabolism[MESH]|Nuclear Proteins/metabolism[MESH]|ran GTP-Binding Protein/metabolism[MESH] |