nuclear protein import
The nuclear import of proteins through nuclear pore complexes (NPCs) illustrates how a complex biological function can be generated by a spatially and temporally organized cycle of interactions between cargoes, carriers and the Ran GTPase.
References
Stewart M. Molecular mechanism of the nuclear protein import cycle. Nat Rev Mol Cell Biol. 2007 Mar;8(3):195-208. PMID: #17287812#