Involved in nucleocytoplasmic trafficking. May have regulatory roles in the gibberellin pathway, in auxin signaling and in light perception. Part of the nuclear pore complex (NPC). The NPC has an eight-fold symmetrical structure comprising a central transport channel and two rings, the cytoplasmic and nuclear rings, to which eight filaments are attached. The cytoplasmic filaments have loose ends, while the nuclear filaments are joined in a distal ring, forming a nuclear basket. NPCs are highly dynamic in configuration and composition, and can be devided in 3 subcomplexes, the NUP62 subcomplex, the NUP107-160 subcomplex and the NUP93 subcomplex, containing approximately 30 different nucleoporin proteins. Interacts with GAI, NUP62, SKP1A and SKP1B. Ubiquitous. Higherst expression in cauline leaves, lowest in roots. Detected at all developmental stages. Contains FG repeats. FG repeats are interaction sites for karyopherins (importins, exportins) and form probably an affinity gradient, guiding the transport proteins unidirectionally with their cargo through the NPC. FG repeat regions are highly flexible and lack ordered secondary structure. The overall conservation of FG repeats regarding exact sequence, spacing, and repeat unit length is limited. Pleiotropic phenotype, including early flowering, increased petiole length and leaf lamina folding toward the abaxial surface in an asymmetrical manner relative to the primary vein. Hypersensitivity to 2,4-dichlorophenoxyacetic acid and paclobutrazol. Belongs to the NUP58 family.