IRS1 Antibody


Western Blot: IRS1 Antibody [NBP1-19838] - Extracts from A549 cells.
Immunohistochemistry-Paraffin: IRS1 Antibody [NBP1-19838] - Human breast carcinoma tissue.
Western Blot: IRS1 Antibody [NBP1-19838] - extracts from 3T3 cells.

Product Details

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IRS1 Antibody Summary

Synthetic peptide, corresponding to amino acids 280-320 of Human IRS-1.
Immunogen affinity purified
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  • Western Blot 1:500-1:1000
  • Immunocytochemistry/Immunofluorescence 1:50-1:200
  • Immunohistochemistry 1:10-1:500
  • Immunohistochemistry-Paraffin 1:50-1:200
Application Notes
Western blot (WB) analyzes of IRS-1 (E306) pAb in extracts from A549 cells.
Immunohistochemistry (IHC) analyzes of IRS-1 (E306) pAb in paraffin-embedded human breast carcinoma tissue.
Theoretical MW
132 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.

Reactivity Notes

Cross reacts with Human, Mouse and Rat.

Packaging, Storage & Formulations

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.
PBS (pH 7.2)
15mM Sodium Azide
1.0 mg/ml
Immunogen affinity purified

Alternate Names for IRS1 Antibody

  • HIRS-1
  • insulin receptor substrate 1
  • IRS1
  • IRS-1


The insulin receptor substrate-1 (IRS-1), a major substrate of the insulin receptor, is phosphorylated in response to stimulation of cells by insulin, insulin-like growth factor 1 (IGF-1) and interleukin 4 (IL-4). IRS-1 is phosphorylated on serine, threonine and tyrosine residues in a variety of tissues. An insulin-sensitive serine/threonine kinase casein kinase II mediates a portion of the insulin-stimulated serine/threonine phosphorylation of overexpressed IRS-1 in vivo. Thr 502 is identified as the major casein kinase II-catalyzed phosphorylation site in rat IRS-1, and Ser 99 is an additional phosphorylation site catalyzed by casein kinase II. Thus, casein kinase II-catalyzed phosphorylation of IRS-1 may be a component of the intracellular insulin signaling cascade. IRS-1 contains three putative binding sites for 14-3-3 (Ser 270, Ser 374 and Ser 641) and the motif around Ser 270 is located in the phosphortyrosine binding domain of IRS-1, which is responsible for the interaction with the insulin receptor. The association of 14-3-3 with IRS-1 increases significantly upon treatment with okadaic acid, a potent serine/ threonine phosphatase inhibitor.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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Product General Protocols

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Video Protocols

WB Video Protocol
ICC/IF Video Protocol

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Secondary Antibodies


Isotype Controls

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Gene Symbol IRS1