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IkappaB alpha Antibody

Rabbit Monoclonal Antibody

  • WB - IkappaB alpha Antibody AJ1389a
    A. Western blot analysis of Hela cell lysate using anti-IkappaB-alpha RabMAb (Cat. #AJ1389a), 1:10,000 dilution.
  • IHC - IkappaB alpha Antibody AJ1389a
    B. Immunohistochemical analysis of paraffin-embedded human prostate carcinoma using anti-IkappaB-alpha RabMAb (Cat. #AJ1389a).
  • FC - IkappaB alpha Antibody AJ1389a
    C. Flow cytometric analysis of permeabilized HeLa cells, untreated (green), TNF-a-treated (red), using anti-IkappaB-alpha RabMAb (Cat. #AJ1389a).
Product Information
  • Applications Legend:
  • WB=Western Blot
  • IHC=Immunohistochemistry
  • IHC-P=Immunohistochemistry (Paraffin-embedded Sections)
  • IHC-F=Immunohistochemistry (Frozen Sections)
  • IF=Immunofluorescence
  • FC=Flow Cytopmetry
  • IC=Immunochemistry
  • ICC=Immunocytochemistry
  • IP=Immunoprecipitation
  • DB=Dot Blot
  • CHIP=Chromatin Immunoprecipitation
  • FA=Fluorescence Assay
  • IEM=Immunoelectronmicroscopy
  • EIA=Enzyme Immunoassay
Primary Accession P25963
Reactivity Human, Mouse, Rat
Host Rabbit
Clonality Monoclonal
Clone Names E130
Calculated MW 35609 Da
Gene ID 4792
Other Names NF-kappa-B inhibitor alpha, I-kappa-B-alpha, IkB-alpha, IkappaBalpha, Major histocompatibility complex enhancer-binding protein MAD3, NFKBIA, IKBA, MAD3, NFKBI
Target/Specificity A synthetic peptide corresponding to human IkappaB-alpha was used as immunogen. Predicted to cross-react with pig, bovine, mouse and rat, based on sequence homology.
Dilution WB~~1:10000
Format 50 mM Tris-Glycine (pH 7.4), 0.15 M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.
StorageMaintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C in small aliquots to prevent freeze-thaw cycles.
PrecautionsIkappaB alpha Antibody is for research use only and not for use in diagnostic or therapeutic procedures.
Protein Information
Synonyms IKBA, MAD3, NFKBI
Function Inhibits the activity of dimeric NF-kappa-B/REL complexes by trapping REL dimers in the cytoplasm through masking of their nuclear localization signals. On cellular stimulation by immune and proinflammatory responses, becomes phosphorylated promoting ubiquitination and degradation, enabling the dimeric RELA to translocate to the nucleus and activate transcription.
Cellular Location Cytoplasm. Nucleus. Note=Shuttles between the nucleus and the cytoplasm by a nuclear localization signal (NLS) and a CRM1-dependent nuclear export.
Research Areas
Citations (0)

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The NF-kappaB/Rel transcription factors are present in the cytosol in an inactive state, complexed with the inhibitory IkappaB-alpha protein (1-5). In response to many different NF-kappaB-inducing agents including T-cell mitogens, proinflammatory cytokines, and viral transactivators, the inhibitory IkappaB-alpha is rapidly phosphorylated and degraded (2). Phosphorylation of IkappaB-alpha at Ser32 and Ser36 has been shown to stimulate conjugation with ubiquitin and subsequent degradation of IkappaB-alpha (3). Activation of NF-kappaB can also be achieved after tyrosine phosphorylation of IkappaBalpha at tyrosine 42, an event that also ultimately leads to the dissociation of NF-kappaB and IkappaBalpha (4). Phosphorylation of IkappaB-alpha at Ser32 and Tyr42 is critical for activation of NF-kappaB, which then translocates to the nucleus and induces transcription of genes that protect organism (1-5).


1. Traenckner, E.B., et al. Phosphorylation of human I kappa B-alpha on serines 32 and 36 controls I kappa B-alpha proteolysis and NF-kappa B activation in response to diverse stimuli. EMBO J. 14: 2876
2. Brockman, J.A., et al. Coupling of a signal response domain in I kappa B alpha to multiple pathways for NF-kappa B activation. Mol. Cell. Biol. 15: 2809
3. Chen, Z.J., et al. Site-specific phosphorylation of IkappaBalpha by a novel ubiquitination-dependent protein kinase activity. Cell 84: 853
4. Brown, K., et al. Control of I kappa B-alpha proteolysis by site-specific, signal-induced phosphorylation. Science 267: 1485

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Cat# AJ1389a
(40 western blots)
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