Application
Extracts of NIH3T3 cells untreated (lane 1) or treated with 50 ng/mL PDGF for 15 minutes (lanes 2-5) were resolved by SDS-PAGE on a 10% Tris-glycine gel and transferred to PVDF. The membrane was blocked with a 4% BSA-TBST buffer for one hour at room temperature, then incubated with the MEK1 [pT292] antibody in a 1% BSA-TBST buffer for two hours at room temperature, following prior incubation with: no peptide (1, 2), a generic phosphothreonine-containing peptide (3), the non-phosphopeptide corresponding to the phosphopeptide immunogen (4), or the phosphopeptide immunogen (5). After washing, the membrane was incubated with goat F(ab’)2 anti-rabbit IgG HRP conjugate and signals were detected. The data show that only the phosphopeptide corresponding to MEK1 [pT292] blocks the antibody signal, demonstrating the specificity of the antibody. The data also show the induction of MEK1 [pT292] phosphorylation by the addition of PDGF to this cell system. In addition, this antibody did not recognize a recombinant MEK1 T292A mutant protein, further demonstrating its specificity for MEK1 [pT292] (data not shown).