| Tissue Specificity | Highly expressed in testis, ovary, small intestine, heart, skeletal muscle, lung and pancreas, but barely detectable in kidney, thymus, colon and peripheral blood leukocytes. |
| Function | Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. 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 nuclear import of AARS1, MRTFA and RANBP3. (Microbial infection) In vitro, mediates the nuclear import of human cytomegalovirus UL84 by recognizing a non-classical NLS. In vitro, mediates the nuclear import of human cytomegalovirus UL84 by recognizing a non-classical NLS. |
| Protein Name | Importin Subunit Alpha-3Importin Alpha Q1Qip1Karyopherin Subunit Alpha-4 |
| Database Links | Reactome: R-HSA-1169408Reactome: R-HSA-168276 |
| Cellular Localisation | CytoplasmNucleus |
| Alternative Antibody Names | Anti-Importin Subunit Alpha-3 antibodyAnti-Importin Alpha Q1 antibodyAnti-Qip1 antibodyAnti-Karyopherin Subunit Alpha-4 antibodyAnti-KPNA4 antibodyAnti-QIP1 antibody |
Information sourced from Uniprot.org
