Human IFN-alpha / beta  R2 Antibody

  
  • Species Reactivity
    Human
  • Specificity
    Detects human IFN-alpha / beta  R2 in direct ELISAs and Western blots. In direct ELISAs, less than 5% cross‑reactivity with recombinant mouse IFN-alpha / beta  R2, recombinant human (rh) IFN-gamma  R1, and rhIFN-gamma  R2 is observed.
  • Source
    Polyclonal Sheep IgG
  • Purification
    Antigen Affinity-purified
  • Immunogen
    Mouse myeloma cell line NS0-derived recombinant human IFN-alpha / beta R2
    Ile27-Lys243
    Accession # P48551
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Label
    Unconjugated
Applications
  •  
    Recommended
    Concentration
    Sample
  • Western Blot
    1 µg/mL
    See below
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Detection of Human IFN‑ alpha / beta  R2 by Western Blot. Western blot shows lysates of K562 human chronic myelogenous leukemia cell line. PVDF Membrane was probed with 1 µg/mL of Human IFN‑ alpha / beta  R2 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4015) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF019). A specific band was detected for IFN‑ alpha / beta  R2 at approximately 58 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.2 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: IFN-alpha/beta R2

IFN-alpha / beta R2, also known as IFNAR2, is a 100 kDa glycoprotein in the class II cytokine receptor family. These proteins form heterodimeric receptor complexes that transduce signals from the interferon, IL-10, and IL-28 families of cytokines (1, 2). IFN-alpha / beta R2, in association with IFN-alpha / beta R1, is required for mediating the antiviral, antiproliferative, and apoptotic effects of the type I interferons IFN-alpha and IFN-beta. IFN-alpha / beta R2 is the principal ligand binding subunit of the receptor. Ligand binding is stabilized by the subsequent association with IFN-alpha / beta R1, resulting in the formation of a signaling ternary receptor complex (3, 4). Mature human IFN-alpha / beta R2 consists of a 217 amino acid (aa) extracellular domain (ECD) with two fibronectin type III repeats, a 21 aa transmembrane segment, and a 251 aa cytoplasmic domain. Alternate splicing generates a secreted isoform that corresponds to the ECD and a 50 kDa transmembrane isoform with a substituted and truncated cytoplasmic region (5, 6). The short isoform is impaired in its ability to activate signaling molecules and functions as a dominant negative receptor subunit (7-9). IFN-alpha / beta R2 is also subject to presenilin-dependent intramembrane proteolysis, resulting in the liberation of nearly the entire ECD as well as the cytoplasmic domain which migrates to the nucleus and can inhibit gene transcription (10). High concentrations of soluble IFN-alpha / beta R2 bind and neutralize IFN-alpha and IFN-beta, while lower concentrations prolong the antiviral activity of circulating IFN-beta but not IFN-alpha (11). Human but not mouse IFN-alpha / beta R2 constitutively associates with STAT4, which may account for species specific differences observed in type I interferon responses (12). Within the ECD, human IFN-alpha / beta R2 shares 63%, 60%, and 48% aa sequence identity with bovine, mouse, and ovine IFN-alpha / beta R2, respectively.

  • References:
    1. Langer, J.A. et al. (2004) Cytokine Growth Factor Rev. 15:33.
    2. Pestka, S. et al. (2004) Immunol. Rev. 202:8.
    3. Lamken, P. et al. (2004) J. Mol. Biol. 341:303.
    4. Arduini, R.M. et al. (1999) Prot. Sci. 8:1867.
    5. Lutfalla, G. et al. (1995) EMBO J. 14:5100.
    6. Novick, D. et al. (1995) J. Leukocyte Biol. 57:712.
    7. Pfeffer, L.M. et al. (1997) J. Biol. Chem. 272:11002.
    8. Gazziola, C. et al. (2005) Int. J. Oncol. 26:129.
    9. Kotenko, S.V. and S. Pestka (2000) Oncogene 19:2557.
    10. Saleh, A.Z.M. et al. (2004) Oncogene 23:7076.
    11. McKenna, S.D. et al. (2004) J. Interferon Cytokine Res. 24:119.
    12. Tyler, D.R. et al. (2007) Mol. Immunol. 44:1864.
  • Long Name:
    Interferon alpha/beta Receptor 2
  • Entrez Gene IDs:
    3455 (Human); 15976 (Mouse)
  • Alternate Names:
    beta receptor10; human interferon alpha; human interferon alpha/beta receptor; IFNABR; IFN-alpha binding protein; IFN-alpha/beta R2; IFN-alpha/beta receptor 2; IFN-alpha-REC; IFNAR2; IFN-aR2; IFNARB; IFNbR2; IFN-bR2; IFN-R; IFN-R-2; interferon (alpha, beta and omega) receptor 2; Interferon alpha binding protein; interferon alpha/beta receptor 2; interferon-alpha/beta receptor beta chain; Type I interferon receptor 2
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