Human Phospho-IRS1 (Y1179) Antibody

  
  • Species Reactivity
    Human
  • Specificity
    Detects Human Phospho-IRS1 (Y1179) in direct ELISAs and Western blots.
  • Source
    Monoclonal Mouse IgG2A Clone # 744353
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    Phosphopeptide containing the human IRS1 Y1179 site
  • 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
  • Immunocytochemistry
    8-25 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 Phospho-IRS1 (Y1179) by Western Blot. Western blot shows lysates of MCF‑7 human breast cancer cell line untreated
(-) or treated (+) with 1 µg/mL Insulin for 5 minutes and 300 U/mL CIP for 1 hour. PVDF membrane was probed with 1 µg/mL of Mouse Anti-Human Phospho-IRS1 (Y1179) Monoclonal Antibody (Catalog # MAB7455) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF018). A specific band was detected for Phospho-IRS1 (Y1179) at approximately 150 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
Immunocytochemistry
Phospho-IRS1 (Y1179) in MCF‑7 Human Cell Line. IRS1 phosphorylated at Y1179 was detected in immersion fixed MCF‑7 human breast cancer cell line using Mouse Anti-Human Phospho-IRS1 (Y1179) Monoclonal Antibody (Catalog # MAB7455) at 25 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Mouse IgG Secondary Antibody (red; Catalog # NL007) and counterstained with DAPI (blue). Specific staining was localized to cytoplasm. View our protocol for Fluorescent ICC Staining of Cells on Coverslips.
Preparation and Storage
  • Reconstitution
    Sterile PBS to a final concentration of 0.5 mg/mL.
  • 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: IRS1

Human IRS1 (insulin receptor substrate 1) is a 160-180 kDa substrate intermediate between the insulin and IGF-I receptor, and downstream signaling modulators.  Upon insulin/IGF-I receptor activation, IRS1 is tyrosine phosphorylated, allowing its association with PI-3 kinase and GRB2.  Human IRS1 is 1242 amino acids (aa) in length.  It contains a PH (pleckstrin homology) domain (aa 12-115), followed by a PTB (phosphotyrosine-binding) domain (aa 160-263) and ten PEST (Pro/Glu/Ser/Thr) regions (aa 340-1225).  IRS1 may be proteolytically cleaved at Arg656-Val657, generating a 90 kDa and 79 kDa fragment. Insulin receptor-mediated phosphorylation of human IRS1 on Y1179, or its murine equivalent, Y1172, mediates IRS-1 interaction with SH2 domains such as that of the Src family kinase, Fyn, or the tyrosine phosphatase, SHP-2.

  • Long Name:
    Insulin Receptor Substrate 1
  • Entrez Gene IDs:
    3667 (Human); 16367 (Mouse); 25467 (Rat)
  • Alternate Names:
    HIRS-1; insulin receptor substrate 1; IRS1; IRS-1
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