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| Reactivity | Human Mouse | 
| Tested applications | WB IHC | 
| Recommended Dilution | WB 1:500 - 1:2000 IHC 1:50 - 1:100 | 
| Calculated MW | 132kDa | 
| Observed MW | Refer to Figures | 
| Immunogen | Recombinant protein of human IRS1 | 
| Storage Buffer | Store at -20℃. Avoid freeze / thaw cycles. Buffer: PBS with 0.02% sodium azide, 50% glycerol, pH7.3. | 
| Concentration | q | 
| Synonym | IRS1;HIRS-1 ; | 
Insulin receptor substrate 1 (IRS-1) is one of the major substrates of the insulin receptor kinase (1). IRS-1 contains multiple tyrosine phosphorylation motifs that serve as docking sites for SH2-domain containing proteins that mediate the metabolic and growth-promoting functions of insulin (2-4). IRS-1 also contains over 30 potential serine/threonine phosphorylation sites. Ser307 of IRS-1 is phosphorylated by JNK (5) and IKK (6) while Ser789 is phosphorylated by SIK-2, a member of the AMPK family (7). The PKC and mTOR pathways mediate phosphorylation of IRS-1 at Ser612 and Ser636/639, respectively (8,9). Phosphorylation of IRS-1 at Ser1101 is mediated by PKCθ and results in an inhibition of insulin signaling in the cell, suggesting a potential mechanism for insulin resistance in some models of obesity (10).
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