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Importin-7 (IPO7)
- Target
- IPO7
- Molecular classification
- Transporter (Nuclear transport receptor, karyopherin-β family), Other (Adapter-like protein in nuclear protein import)
01
Overview
Importin-7 (IPO7) is a member of the karyopherin-β family, functioning as a nuclear transporter that binds cargo proteins in the cytoplasm and mediates their translocation through the nuclear pore complex via a Ran-dependent mechanism[1][2][7]. It imports a range of substrates, including histones, ribosomal proteins, transcriptional regulators (YAP, Smads, Erk), and viral proteins (HIV-1 integrase, flavivirus core proteins), and can act both autonomously or as an adapter with other importins[1][3][4][5][6][7][8]. Importin-7 plays roles in mechanotransduction, cell differentiation, viral infection, and cell survival, with deregulation or targeting of IPO7 implicated in cancer and viral disease contexts[1][3][5][6][8]. It is essential for normal cell function, making therapeutic targeting challenging[8].
- Other names
- Importin-7IPO7Imp7RANBP7RanBP7Ran-binding protein 7
02
Mechanism of action
For nuclear import inhibitors: Block IPO7 cargo transport into the nucleus, interfering with viral replication or cell signaling pathways relevant in cancer. For antiviral strategies: Disrupt IPO7-mediated nuclear entry of viral proteins (HIV-1 integrase, flavivirus core proteins).
03
Biological functions
Nuclear protein import (mediates import of proteins with nuclear localization signals)Cell signaling (transports transcriptional regulators and signaling proteins)Regulation of cell differentiation (facilitates nuclear import relevant for odontoblast and osteoblast differentiation)Immune response and viral interaction (involved in nuclear import of viral proteins)Mechanotransduction (regulates nuclear import of YAP in response to mechanical cues)
04
Disease associations
Cancer (proliferation and survival, especially in relation to YAP and USP22)Infection (mediates nuclear import for viral proteins of HIV-1, flaviviruses, Epstein-Barr Virus)Other: Nephrotic syndrome, cystic fibrosis (listed as disease associations but mechanistic details underexplored)
05
Safety considerations
Essentiality: IPO7 is required for cell survival, so systemic inhibition risks broad cytotoxicityMultiple cargos: Broad inhibition may affect import of numerous proteins in normal cell functions, leading to unwanted effects (e.g., impaired differentiation, global transcriptional dysregulation)
06
Interacting drugs
No approved drugs directly targeting Importin-7; experimental inhibitors of nuclear import processes and studies on antiviral strategies suggest indirect modulation
07
Biomarkers
IPO7 expression or mutation as a survival/efficacy biomarker in EBV-positive cancersPotential marker for cell mechanotransduction status (YAP nuclear localization via IPO7)
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