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2 protocols using anti hemagglutinin ha antibody

1

Immunoprecipitation Assay for Protein-Protein Interactions

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HEK-293T cells were transiently transfected using Lipofectamine 2000 (Life Technologies). Cells were lysed in 0.5% TNTE. After pre-clearing with protein G-Sepharose, lysates were incubated with anti-Flag M2 antibody (Sigma) or anti-Hemagglutinin (HA)-antibody (Roche) bound to Protein-G Dynabeads (Life TechnologiesTM) for 2 hours at 4°C. Immunoprecipitates were washed 5 times with 0.1% TNTE, subjected to SDS-PAGE, transferred onto nitrocellulose and immunoblotted with the anti-Hemagglutinin (HA)-antibody (Roche) or anti-Flag M2 antibody (Sigma). Detection was achieved using horseradish peroxidase-conjugated rabbit anti-rat (Sigma) or sheep anti-mouse secondary antibodies (GE Healthcare) and chemiluminescence. ImageJ was used for quantification of band intensities.
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2

Evaluating Protein Interactions in Cell Signaling

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Antibodies against CK2α, p53, p21Cip1/WAF1, and β-actin were obtained from Santa Cruz Biotechnology (USA). An antibody against phospho-p53 serine 392 (S392) was purchased from Cell Signaling Technology (USA), and antibodies against HP1γ, SUV39h1, H3K9me3, histone H3, and MDM2 were from Abcam (UK). Both 4′,6-diamidino-2-phenylindole (DAPI) and rhodamine-conjugated goat anti-rabbit IgG were purchased from Invitrogen (USA). The anti-hemagglutinin (HA) antibody was obtained from Roche (Switzerland) and TrueBlot reagent was from Rockland (USA). Pifithrin-α, nutlin-3, cycloheximide, N-Acetyl-L-cysteine (NAC), wortmannin, triciribine, and rapamycin were obtained from Sigma Chemical (USA).
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