| Full protein name | Importin subunit beta-1;Importin-90;Karyopherin subunit beta-1;Nuclear factor p97;Pore targeting complex 97 kDa subunit;PTAC97 |
| Gene name | KPNB1;NTF97 |
| Species | Homo sapiens |
| Localization | Cytoplasm;Nucleus envelope. |
| Description | Functions in nuclear protein import, either in association with an adapter protein, like an importin-alpha subunit, which binds to nuclear localization signals (NLS) in cargo substrates, or by acting as autonomous nuclear transport receptor. Acting autonomously, serves itself as NLS receptor. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Mediates autonomously the nuclear import of ribosomal proteins RPL23A, RPS7 and RPL5. Binds to a beta-like import receptor binding (BIB) domain of RPL23A. In association with IPO7 mediates the nuclear import of H1 histone. In vitro, mediates nuclear import of H2A, H2B, H3 and H4 histones. In case of HIV-1 infection, binds and mediates the nuclear import of HIV-1 Rev. Imports SNAI1 and PRKCI into the nucleus. |
| GO term | GO:0019899; enzyme binding; IPI:UniProtKB. GO:0051879; Hsp90 protein binding; IEA:Ensembl. GO:0061676; importin-alpha family protein binding; IEA:Ensembl. GO:0061608; nuclear import signal receptor activity; IBA:GO_Central. GO:0008139; nuclear localization sequence binding; IBA:GO_Central. GO:0019904; protein domain specific binding; IPI:UniProtKB. GO:0003723; RNA binding; HDA:UniProtKB. GO:0031267; small GTPase binding; IEA:InterPro. GO:0008270; zinc ion binding; TAS:ProtInc. |
| Full sequence length | 876 |
| Database linked | MobiDB :Q14974 IDEAL :IID00386 OMIM :602738 |
| IDR Region | 1 876 |
| LCR Region | 1 876 |