Component of the nuclear pore complex that has a direct role in nuclear protein import (By similarity). Actively displaces NLSs from importin-alpha, and facilitates disassembly of the importin-alpha:beta-cargo complex and importin recycling (By similarity). Binds to transcriptionally active chromatin sites when located in the nucleoplasm and is involved in transcriptional activation (PubMed:20144760). Associates with chromatin (PubMed:20144760). 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.