Recombinant Human KPNA4

Background

KPNA4, also known as importin-α3, is a nuclear transport adaptor protein that recognizes classical nuclear localization signals (NLS) in cargo proteins and facilitates their nuclear import via the importin-β pathway. KPNA4 binds cargo proteins, such as transcription factors and kinases, forming a complex that translocates through the nuclear pore complex (NPC). It is widely expressed and plays critical roles in cell cycle regulation, transcriptional control, and stress responses. KPNA4 is implicated in viral replication by mediating the nuclear import of viral proteins in pathogens like HIV and influenza virus. Dysregulation of KPNA4 has been linked to cancers, where it enhances nuclear transport of oncogenic proteins and supports tumor progression. Knockdown studies show its role in maintaining proper cellular signaling, highlighting its importance in development, differentiation, and immune responses.