IRS-1 is one of the major substrates of insulin receptor kinase.
IRS-1 protein contains a conserved pleckstrin homology (PH) domain located at its amino terminus, adjacent to a phospho-tyrosine binding (PTB) domain.
IRS-1 contains multiple tyrosine phosphorylation motifs that serve as docking sites for SH2 domain–containing proteins (Grb2, p85, SHP-2, Fyn and others) and which mediate the metabolic and growthpromoting functions of insulin.
IRS-1 also contains over 30 potential Ser/Thr phosphorylation sites for kinases, such as PKA, PKC and MAPK.
Once phosphorylated by insulin receptor, IRS-1 recruits the downstream components that mediate the insulin signaling.
Applications:Suitable for use in Western Blot and Immunoprecipitation.
Other applications not tested.
Recommended Dilution:Western Blot: 0.5-2ug/ml detects IRS-1 in RIPA lysates from 3T3/A31 mouse fibroblasts.
3T3/A31 cell lysate was resolved by electrophoresis, transferred to nitrocellulose and probed with I8700 (0.5ug/ml).
Proteins were visualized using a goat anti-rabbit secondary antibody conjugated to HRP and a chemiluminescence detection system.
Previous lots detected IRS-1 in RIPA lysates of rat L6 myoblasts.
In cells that contain high levels of IRS-1, this lot may work optimally at 0.1-0.5ug/ml
Immunoprecipitation: 4ug immunoprecipitates IRS-1 from 500ug of 3T3/A31 RIPA lysateOptimal dilutions to be determined by the researcher.