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4 protocols using stag2

1

Analyzing Cohesin Complex Protein Levels

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Protein was extracted from equal cell numbers in a high urea buffer (48% urea, 15 mM Tris-HCl, pH 7.5, 8.7% glycerin, 1% SDS, 0.004% bromophenol blue, and 143 mM β-mercaptoethanol). Protein levels were measured using the Bradford assay. Equal amounts of protein were loaded on NuPAGE Novex 4–12% Bis-Tris protein gel (NP0321; Life Technologies) and run with NuPAGE MOPS buffer (NP0001; Life Technologies). Proteins were transferred to Immobilon P (IPVH00010; EMD Millipore). Membrane was blocked in 5% nonfat milk in TBST and incubated with antibodies for Rad21 (H-210; Santa Cruz Biotechnology, Inc.), Smc1a (A300-055A; Bethyl Laboratories, Inc.), Smc3 (ab9263; Abcam), Stag2 (J-12; Santa Cruz Biotechnology, Inc.) and Actin B (C4; EMD Millipore). Secondary antibodies used were HRP conjugated (NA9340 and NA931; GE Healthcare). Blot was visualized using ECL (PI34077 and PI34095; Thermo Fisher Scientific).
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2

Western Blot Analysis of Cellular Proteins

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Cells were lysed in a modified lysis buffer (50 mM Tris pH 7.4, 150 mM NaCl, 1% NP-40, 1 mM EDTA, 50 mM NaF, 10 mM β-glycerophosphate, 10 nM calyculin A, 1 mM Na3VO4, and protease inhibitors), followed by SDS-PAGE and western blotting analysis as previously described55 (link). The primary antibodies against STAG2 (Santa Cruz, SC-81852), IRF9 (Cell Signaling, #76684), IRF7 (Cell Signaling, #4920), USP18 (Cell Signaling, #4813), ISG15 (Santa Cruz, SC-166755), IRF1 (Cell Signaling, #8478), IRF3 (Cell Signaling, #11904), GAPDH (Cell Signaling, #2118), GAPDH (Cell Signaling, #51332), STAG1 (Novus Biologicals, NB100-298), PD-L1 (R&D Systems, AF156), CTCF (Cell Signaling, #2899), and Flag M2 (Sigma, F3165) were used. All primary antibodies were used at a 1:1,000 dilution, with the exception of GAPDH (1:3000) and PD-L1 (1:200).
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3

Camel Tissue Protein Isolation and Quantification

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Total protein was isolated from camel tissues using lysis buffer (Solarbio, Beijing, China) and quantified using a BCA protein assay kit (Boster). Samples equivalent to 50 μg of protein were resolved using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and were electrotransferred to PVDF membranes (Millipore CAT, Billerica, MA, USA). The membranes were blocked for 2 h in Tris–HCl buffer containing 5% (w/v) non-fat milk powder, then were incubated overnight at 4 °C with the following primary antibodies from mice or rabbits: ACTB (1:5000, Proteintech, China), CAMK2G (1:1000, Proteintech), FST (1:1000, Proteintech), NR5A1 (1:500, Proteintech), PAK1 (1:1000, Santa Cruz, USA), PRL (1:1000, Santa Cruz), STAG2 (1:1000, Santa Cruz), TGFB2 (1:500, Santa Cruz), Wnt2b (1:500, Santa Cruz), GAPDH (1:5000, Proteintech). Membranes were then washed three times with PBS containing 0.1% Tween 20, incubated with goat anti-mouse/anti-rabbit IgG conjugated to horseradish peroxidase for 2 h at room temperature (1:5000, Bioss, Beijing, China), then washed three times with PBS containing 0.1% Tween 20. All immunoblot assays were performed at least three times. Optical densities of the bands were quantified, and membranes were scanned using Image-Pro plus 6.0 (Media Cybernetics Co., Rockville, MD, USA).
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4

Whole-cell extract immunoblotting analysis

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Whole-cell extracts were prepared with protein lysis buffer (50mM Tris-HCl at pH 7.4, 1% Triton X-100, 0.1% SDS, 150mM NaCl, 1mM EDTA, and 1mM DTT), with addition of cocktail protease inhibitor tablets (Complete, Roche). Membranes were stained with FLI1 (ab133485; Abcam) (used to detect the EWSR1-FLI1 translocation), STAG2 (sc81852; Santa Cruz), p53 (sc126; Santa Cruz) or p16 (554079; BD Pharmingen) antibodies. ACTIN (sc1616; Santa Cruz) and VINCULIN (sc73614; Santa Cruz) antibodies were used as loading controls. Membranes were visualized with Odyssey CLx Imaging System (LI-COR Biosciences).
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