Recombinant Human Importin subunit beta-1(KPNB1) ,partial

Code CSB-YP622929HU
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Source Yeast
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Code CSB-EP622929HU
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Source E.coli
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Code CSB-EP622929HU-B
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Source E.coli
Conjugate Avi-tag Biotinylated
E. coli biotin ligase (BirA) is highly specific in covalently attaching biotin to the 15 amino acid AviTag peptide. This recombinant protein was biotinylated in vivo by AviTag-BirA technology, which method is BriA catalyzes amide linkage between the biotin and the specific lysine of the AviTag.
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Code CSB-BP622929HU
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Source Baculovirus
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Code CSB-MP622929HU
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Source Mammalian cell
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Product Details

Purity >85% (SDS-PAGE)
Target Names KPNB1
Uniprot No. Q14974
Alternative Names IMB 1; IMB1; IMB1_HUMAN; Impnb; Importin 90; Importin beta 1; Importin beta 1 subunit; Importin subunit beta-1; Importin-90; IPOB; Karyopherin beta 1; Karyopherin beta 1 subunit; Karyopherin subunit beta-1; KPNB 1; Kpnb1; MGC2155; MGC2156; MGC2157; NTF 97; NTF97; NTF97/Importin beta; Nuclear factor P97; Pore targeting complex 97 kDa subunit; PTAC97
Species Homo sapiens (Human)
Protein Length Partial
Tag Info The following tags are available.
N-terminal His-tagged
The tag type will be determined during production process. If you have specified tag type, please tell us and we will develop the specified tag preferentially.
Form Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.
Buffer before Lyophilization Tris/PBS-based buffer, 6% Trehalose, pH 8.0
Reconstitution We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20℃/-80℃. Our default final concentration of glycerol is 50%. Customers could use it as reference.
and FAQs
Protein FAQs
Storage Condition Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.
Shelf Life The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Lead Time Delivery time may differ from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.
Notes Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Datasheet Please contact us to get it.

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Target Background

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.
Gene References into Functions
  1. our findings suggest that Kpnbeta1 plays a significant role in non-small cell lung cancer progression and chemoresistance PMID: 29622086
  2. Study identified that high expression of Kpnbeta1 in breast cancer (BC) often leads to poor prognosis and that Kpnbeta1-knockdown markedly reduced BC cell proliferation by abrogating nuclear transport of Her2. PMID: 29251332
  3. Data suggest that IGFBP5 nuclear import is mediated by KPNA5/KPNB1 complex; nuclear localization sequence of IGFBP5 is critical domain in this nuclear translocation. (IGFBP5 = insulin-like growth factor binding protein-5; KPNA5 = karyopherin subunit alpha-5; KPNB1 = karyopherin subunit beta-1/importin-beta) PMID: 28835592
  4. KPNB1 and Ran protein jointly mediated the nuclear import of NDV M protein, showing that KPNB1 protein interacted with NDV M protein to form binary complex and then entered into the nucleus with the assistance of Ran protein. PMID: 29746765
  5. Results show that importin beta1 is an Epac1 binding partner that regulates Epac1 subcellular localization. PMID: 27808165
  6. Results found KPNB1 to be required for the migration and invasion of cervical cancer cells through mediating nuclear import. Its inhibition of KPNB1 interferes with NFkB subcellular localization. PMID: 28427184
  7. These results showed that BLM enters the nucleus via the importin beta1, RanGDP and NTF2 dependent pathway, demonstrating for the first time the nuclear trafficking mechanism of a DNA helicase. PMID: 29017749
  8. Therefore, we show for the first time that the nuclear localization of Cat L and its substrate Cux1can be positively regulated by Snail NLS and importin beta1, suggesting that Snail, Cat L and Cux1 all utilize importin beta1 for nuclear import. PMID: 28698143
  9. KPNB1 might enhance human glioma proliferation via Wnt/beta-Catenin Pathway. PMID: 27568288
  10. Importins, Impbeta, Kapbeta2, Imp4, Imp5, Imp7, Imp9, and Impalpha, show the H3 tail binding more tightly than the H4 tail. The H3 tail binds Kapbeta2 and Imp5 with KD values of 77 and 57 nm, respectively, and binds the other five Importins more weakly. PMID: 27528606
  11. KPNbeta1 was significantly highly expressed in gastric cancer and was correlated with tumor grade as well as poor prognosis. PMID: 26242264
  12. Patients with tumors highly expressing Kpnbeta1 have poorer overall survivals. Kpnbeta1 interacts with p65 and enhances cell adhesion-mediated drug resistance. PMID: 26498772
  13. Collectively, these data show that KPNB1 is required for timely nuclear import of PER/CRY in the negative feedback regulation of the circadian clock. PMID: 26319354
  14. Humanin Peptide Binds to Insulin-Like Growth Factor-Binding Protein 3 (IGFBP3) and Regulates Its Interaction with Importin-beta. PMID: 26216267
  15. RBBP4 functions as a novel regulatory factor to increase the efficiency of importin alpha/beta-mediated nuclear import PMID: 26491019
  16. High expression of KPNB1 protein is associated with hepatocellular carcinoma. PMID: 25794490
  17. Data show that cytoskeleton associated protein 5 (chTOG) only weakly promotes importin-regulated microtubule nucleation, but acts synergistically with microtubule- associated protein TPX2. PMID: 26414402
  18. Data reveal a novel role for miR-9 in regulation of the NFAT pathway by targeting KPNB1 and DYRK1B. PMID: 25696812
  19. Data show that importin-beta (impbeta) alters the nuclear pore's permeability in a Ran-dependent manner, suggesting that impbeta is a functional component of the nuclear pore complex (NPC). PMID: 25748139
  20. DZNep suppressed EZH2/miR-30a,d/KPNB1 signaling. PMID: 25890085
  21. Importin beta1 mediates the translocation of NF-kappaB into the nuclei of myeloma cells, thereby regulating proliferation and blocking apoptosis, which provides new insights for targeted myeloma therapies. PMID: 25643631
  22. ARHI competes with RanGTPase and interacts with importin beta via basic-acidic patch interaction, which leads to inhibition of STAT3 translocation. PMID: 25499977
  23. The study revealed a regulatory role of the p97-Npl4-Ufd1 complex in regulating a partial degradation of the NF-kappaB subunit p100. PMID: 26112410
  24. This hypersensitivity of malignant cell types to Impbeta1 knockdown raises the exciting possibility of anti-cancer therapies targeted at Impbeta1. PMID: 25960398
  25. Importin-beta1 mediates the non-classical nucleocytoplasmic transport of MARVELD1. PMID: 26107903
  26. Although there are many kinds of C2H2-type ZFs which have the same fold as Snail, nuclear import by direct recognition of importin beta is observed in a limited number of C2H2-type zinc-finger proteins such as Snail PMID: 24699649
  27. ARTD15 plays role in nucleocytoplasmic shuttling, through karyopherin-beta1 mono-ADP-ribosylation. [review] PMID: 25037261
  28. These data reveal an emergent Kap-centric barrier mechanism that may underlie mechanistic and kinetic control in the nuclear pore complex. PMID: 24739174
  29. Data suggest nuclear entry of GLI1 (glioma-associated oncogene homolog, a zinc finger protein) is regulated by unique mechanism via mutually exclusive binding by its nuclear import factor IMB1 (importin B1) and SuFu (suppressor of fused protein). PMID: 24854174
  30. The results here establish for the first time that intracellular calcium modulates conventional nuclear import through direct effects on the nuclear transport machinery. PMID: 24953690
  31. This work extends published observations on SAMHD1 nuclear localization to a natural cell type for HIV-1 infection and identifies KPNA2/KPNB1 as cellular proteins important for SAMHD1 nuclear import. PMID: 24712655
  32. Knockdown of KPNB1 reduced the amount of nuclear p65 following TNF stimulation. KPNB1 binding to p65 is NLS dependent. PMID: 23906023
  33. the inhibition of endogenous Kpnbeta1 in cervical cancer cells results in a significant increase in mitotic abnormalities and a prolonged mitotic arrest. PMID: 24398670
  34. Ei24 can bind specifically to IMPbeta1 and IMPalpha2 to impede their normal role in nuclear import. PMID: 24821838
  35. we report that the EZH2-miR-30d-KPNB1 signalling pathway is critical for malignant peripheral nerve sheath tumour cell survival in vitro and tumourigenicity in vivo PMID: 24132643
  36. The role of Kpnbeta1 in cancer is only now being elucidated, and recent work points to its potential usefulness as an anti-cancer target. PMID: 23557333
  37. Identification of a karyopherin beta1/beta2 proline-tyrosine nuclear localization signal in huntingtin protein. PMID: 23012356
  38. Nuclear translocation of Wilms' tumour protein involves importins alpha and beta, and a nuclear localisation signal in the third zinc finger PMID: 22415091
  39. Findings suggest that the deregulated activity of E2F in cancer cells causes increased activation of the Kpnbeta1 and Kpnalpha2 promoters, leading to elevated levels of these proteins, and ultimately impacting the cancer phenotype. PMID: 22125623
  40. Findings suggest that the importin beta1-mediated nuclear localization of DR5 limits the DR5/TRAIL-induced cell death of human tumor cells and thus can be a novel target to improve cancer therapy with recombinant TRAIL and anti-DR5 antibodies. PMID: 22020938
  41. study defines importin-alpha/importin-beta1/Ran as the molecular mechanism by which STAT3 traffics to the nucleus PMID: 21625522
  42. [review] The cellular functions of Ran are mediated by RanGTP interactions with nuclear transport receptors related to importin beta and depend on the existence of chromosome-centered RanGTP gradient. PMID: 21630149
  43. Importin beta interacts with the NFAT-tubulin alpha complex rather than NFAT or tubulin alpha alone, resulting in cotranslocation of NFAT and tubulin alpha into the nucleus. PMID: 21278340
  44. Results demonstrate that PP2A-B55alpha and importin-beta1 cooperate in the regulation of postmitotic assembly mechanisms in human cells. PMID: 20711181
  45. [review] Recognition and shuttling of calcineurin into the nucleus by importin-beta requires the nuclear localization sequence of the region spanning amino acids 172-183 of calcineurin A beta. PMID: 19925438
  46. nuclear import of the HPV16 E6 oncoprotein in digitonin-permeabilized HeLa cells could be mediated by Kap beta1 PMID: 12551970
  47. XCTK2 binding to microtubules inhibited in the presence of importin alpha and beta PMID: 13679510
  48. Importin alpha/beta-mediated nuclear import machinery is regulated in a cell cycle-dependent manner through the modulation of interaction modes between importins alpha and beta. PMID: 15194443
  49. Inhibition by Impbeta results from depletion nuclear RanGTP, and, in support of this mechanism, expression of mRFP-Ran reversed the inhibition. PMID: 15795315
  50. These data suggest the importance of receptor endocytosis, endosomal sorting machinery, interaction with importins alpha1/beta1, and exportin CRM1 in EGFR nuclear-cytoplasmic trafficking. PMID: 16552725

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Subcellular Location Cytoplasm. Nucleus envelope.
Protein Families Importin beta family, Importin beta-1 subfamily
Database Links

HGNC: 6400

OMIM: 602738

KEGG: hsa:3837

STRING: 9606.ENSP00000290158

UniGene: Hs.532793

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