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2 protocols using il 17ra

1

Quantification of Signaling Proteins

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Cells were seeded in 6-well plates as described above for 48 h but at a density of 1 × 106 in 3 mL culture medium. Following this period, the culture medium was replaced with 2 mL fresh culture medium for 2 h. Cells were lysed with radioimmunoprecipitation assay lysis buffer supplemented with Halts protease and phosphatase inhibitors (Thermo Fisher Scientific). Total protein was quantified with the Pierce BCA Protein Assay Kit (Thermo Fisher Scientific). Equal amounts of total cell lysate (30 mg per well) were subjected to sodium dodecyl sulfate electrophoresis on 4 to 12% Bis-Tris gels (Thermo Fisher Scientific). Gels were run at a constant voltage of 100 mV (PowerPac 3000, Bio-Rad) and transferred onto a nitrocellulose membrane with the iBlot2 Transfer System (Thermo Fisher Scientific) as per manufacturer’s instructions. Immunoblotting was completed for GAPDH, IL-17RA, TRAF6 (all Cell Signaling Technology), and IL-17RC (Abcam). A Li-Cor Azure C500 imager was used to visualize immunoblots, and ImageJ software (NIH) was used for quantification.
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2

Affinity Purification of Strep-Tagged Proteins

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Transfected and treated HEK293T cells were pelleted and washed in cold D-PBS and later resuspended in Flag-IP Buffer (50 mM Tris HCl, pH 7.4, with 150 mM NaCl, 1 mM EDTA, and 1% NP-40) with 1x HALT (ThermoFisher Scientific, 78429), incubated with buffer for 15 min on ice then centrifuged at 13,000 rpm for 5 min. The supernatant was collected and 1 mg of protein was used for immunoprecipitation (IP) with 100 μl of Streptactin Sepharose (IBA, 2-1201-010) on a rotor overnight at 4°C. Immunoprecipitates were washed five times with Flag-IP buffer and eluted with 1x Buffer E (100 mM Tris-Cl, 150 mM NaCl, 1 mM EDTA, 2.5 mM Desthiobiotin). Eluate was diluted with 1x-NuPAGE (ThermoFisher Scientific, #NP0008) LDS Sample Buffer with 2.5% β-Mercaptoethanol and blotted for targeted antibodies. Antibodies used were Strep tag II (Qiagen, #34850), B-Actin (Sigma, #A5316), and IL17RA (Cell Signaling, #12661S).
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