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lüll The molecular mechanism of transport of macromolecules through nuclear pore complexes Bayliss R; Corbett AH; Stewart MTraffic 2000[Jun]; 1 (6): 448-56Trafficking of macromolecules between nuclear and cytoplasmic compartments takes place through the nuclear pore complexes (NPCs) of the nuclear envelope. Nuclear trafficking involves a complex series of interactions between cargo, soluble transport factors (carriers) and nuclear pore proteins (nucleoporins) that are orchestrated by the Ras-family GTPase Ran. The primary role of Ran is probably to establish directionality and to sort molecules to be transported by controlling the interaction between carriers and cargoes, so that they bind in one compartment but dissociate in the other. Translocation of carriers and cargo-carrier complexes through NPCs requires interactions between the carriers and nucleoporins that contain distinctive tandem sequence repeats based on cores rich in glycine and phenylalanine residues that are separated by hydrophilic linkers. Much recent work has focused on these interactions and, in particular, their specificity, regulation and function. Evidence is accumulating that carriers move through the NPC by distinct but overlapping routes using specific subsets of nucleoporins.|Animals[MESH]|Biological Transport, Active[MESH]|Cytoplasm/metabolism[MESH]|Humans[MESH]|Macromolecular Substances[MESH]|Membrane Proteins/metabolism[MESH]|Models, Biological[MESH]|Nuclear Pore/*metabolism[MESH]|Nuclear Proteins/metabolism[MESH]|RNA/metabolism[MESH]|ran GTP-Binding Protein/metabolism[MESH] |