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Coordination of intracellular transport steps by GTPases Segev NSemin Cell Dev Biol 2011[Feb]; 22 (1): 33-8Coordination of transport steps between intracellular compartments is important for ensuring unobstructed traffic flow while maintaining compartment size. Small GTPases from the Rab, Arf and Rho families, which regulate individual transport steps, have also emerged as coordinators of these steps. Here, I summarize evidence supporting the existence of GTPase-dependent transport step coordination at three levels: maturation of two cellular sorting compartments, Golgi and endosomes; coupling of vesicular transport sub-steps between donor and acceptor compartments; and integration of transport steps into whole pathways. The mechanisms proposed for GTPase-mediated transport-step coordination depend on the ability of single GTPases to interact with multiple effectors and on interactions of multiple GTPases through common accessory factors.|Animals[MESH]|Biological Transport[MESH]|GTP Phosphohydrolases/*metabolism[MESH]|Intracellular Space/*metabolism[MESH]|Protein Binding[MESH] |
