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6 protocols using trueblot secondary antibody

1

Antibody Procurement for GFP, HA, and Phospho-Proteins

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Anti -GFP antibodies (# 9996) were obtained from Santa Cruz Biotechnology Inc. (Santa Cruz, CA). The HA antibody was obtained from Sigma (Newark, NJ). S6, Phospho-S6, YAP and Phospho-YAP antibodies (#2212, #2211, #4912, #4911) were obtained from Cell Signaling (Danvers, MA) Trueblot secondary antibodies were purchased from eBioscience (San Diego, CA).HRP conjugated or Trueblot secondary antibodies were purchased from eBioscience (San Diego, CA).
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2

Protein Extraction and Western Blot Analysis

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Cell lysates were prepared with RIPA Buffer. Mouse tissues were homogenized mechanically in tissue lysis buffer (50mM Tris HCl pH 7.5, 320mM Sucrose, 50mM NaCl, 1% Triton X-100 and protease and phosphatase inhibitors). Homogenates were centrifuged at 13,000xrpm at 4°C for 30min and supernatants were collected. Protein extracts were quantified by Lowry protein assay (Biorad), and denatured by adding Laemmli Buffer (0,1% Bromophenol blue, 10% Glycerol, 2% SDS, 5% ß-mercaptoethanol, 270mM Tris HCl pH.6.8). A total of 30-50μg of proteins was analysed by SDS-polyacrylamide gel electrophoresis and immunoblotting. Proteins were separated on acrylamide gel (Biorad) and electroblotted onto nitrocellulose membranes (Protran, Schleicher & Schuell). Blots were incubated with primary antibodies in 5% non-fat dry milk in PBS plus 0,1% Tween-20 overnight at 4°C. Detection was achieved using horseradish peroxidase-conjugate secondary antibody (Biorad) and visualized with ECL plus (Amersham Bioscience). For the Western Blot analysis of immunoprecipitated C-MYC, TrueBlot@ secondary antibody (EBioscience) was used, in order to minimize detection of Immunoglobulines in the immunoprecipitation samples.
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3

Protein Extraction and Western Blot Analysis

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Cell lysates were prepared with RIPA Buffer. Mouse tissues were homogenized mechanically in tissue lysis buffer (50mM Tris HCl pH 7.5, 320mM Sucrose, 50mM NaCl, 1% Triton X-100 and protease and phosphatase inhibitors). Homogenates were centrifuged at 13,000xrpm at 4°C for 30min and supernatants were collected. Protein extracts were quantified by Lowry protein assay (Biorad), and denatured by adding Laemmli Buffer (0,1% Bromophenol blue, 10% Glycerol, 2% SDS, 5% ß-mercaptoethanol, 270mM Tris HCl pH.6.8). A total of 30-50μg of proteins was analysed by SDS-polyacrylamide gel electrophoresis and immunoblotting. Proteins were separated on acrylamide gel (Biorad) and electroblotted onto nitrocellulose membranes (Protran, Schleicher & Schuell). Blots were incubated with primary antibodies in 5% non-fat dry milk in PBS plus 0,1% Tween-20 overnight at 4°C. Detection was achieved using horseradish peroxidase-conjugate secondary antibody (Biorad) and visualized with ECL plus (Amersham Bioscience). For the Western Blot analysis of immunoprecipitated C-MYC, TrueBlot@ secondary antibody (EBioscience) was used, in order to minimize detection of Immunoglobulines in the immunoprecipitation samples.
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4

Immunoprecipitation of SmAkt Proteins

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Expression and phosphorylation of SmAkt proteins in oocytes were confirmed by immunoprecipitation of oocyte lysates according to the procedure described previously (Vicogne et al., 2004 (link)). Following 15 h of expression, oocytes were lysed in buffer A (50 mM Hepes pH 7.4, 500 mM NaCl, 0.05% SDS, 5 mM MgCl2, 1 mg/mL bovine serum albumin, 10 μg/mL leupeptin, 10 μg/mL aprotinin, 10 μg/mL soybean trypsin inhibitor, 10 μg/mL benzamidine, 1 mM PMSF, 1 mM sodium vanadate) containing 0.5% Triton X-100 and centrifuged at 12,000g for 15 min at 4 °C. Lysates were incubated with anti-V5 antibodies (1:100, Invitrogen) for 4 h at 4 °C. Protein A-Sepharose beads (5 mg; Amersham Biosciences) were added for 1 h at 4 °C. Beads were washed three times and resuspended in Laemmli sample buffer. Eluted immune complexes were subjected to a 10% SDS–PAGE, then analyzed by Western blotting using anti-V5 (1:50,000) or anti-phospho-T308 Akt (1:5000; Upstate Biotechnology) antibodies. Mouse or rabbit Trueblot® secondary antibodies (eBioscience) were used as secondary antibodies and chemoluminescence was revealed using the advanced ECL detection system (Amersham Biosciences).
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5

Immunoblotting Protein Detection Protocol

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Immunoblots were performed as described 57 (link), 58 (link). The primary antibodies were TRIP13 (1:3000, #19802-1-AP) from Proteintech, Chicago, IL, KU70 (1:1000, # AB1358), anti-phospho-H2AX(ser139) (γH2AX) (1:1000, #05–636) both from Millipore, Billerica, MA), KU80 (1:1000,#2180), DNA-PKcs (1:1000, #4602) anti-phospho-DNA-PKcs (Ser 2056) all from Cell Signaling Technology, Boston, MA, and Actin (1:3000, # 612656) from BD Biosciences, Franklin Lakes, NJ). Secondary antibodies were HRP-conjugated goat anti-rabbit IgG or goat anti-mouse IgG (Jackson Immuno Research Laboratories, West Grove, PA). For IP, TrueBlot secondary antibodies (eBioscience Rbt#18-8816, Mouse#18-8817) were used. Immunoreactive proteins were visualized by SuperSignal-West-Pico-Chemiluminescent system (Pierce, Pittsburgh, PA). The uncropped scanned films with molecular weight reference are included in the Supplementary Figure 9 through 11 in sequence of appearance in the main text. Signal intensity was quantified using ImageJ software (http://rsbweb.nih.gov/ij/).
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6

Immunoblotting Protein Detection Protocol

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Immunoblots were performed as described 57 (link), 58 (link). The primary antibodies were TRIP13 (1:3000, #19802-1-AP) from Proteintech, Chicago, IL, KU70 (1:1000, # AB1358), anti-phospho-H2AX(ser139) (γH2AX) (1:1000, #05–636) both from Millipore, Billerica, MA), KU80 (1:1000,#2180), DNA-PKcs (1:1000, #4602) anti-phospho-DNA-PKcs (Ser 2056) all from Cell Signaling Technology, Boston, MA, and Actin (1:3000, # 612656) from BD Biosciences, Franklin Lakes, NJ). Secondary antibodies were HRP-conjugated goat anti-rabbit IgG or goat anti-mouse IgG (Jackson Immuno Research Laboratories, West Grove, PA). For IP, TrueBlot secondary antibodies (eBioscience Rbt#18-8816, Mouse#18-8817) were used. Immunoreactive proteins were visualized by SuperSignal-West-Pico-Chemiluminescent system (Pierce, Pittsburgh, PA). The uncropped scanned films with molecular weight reference are included in the Supplementary Figure 9 through 11 in sequence of appearance in the main text. Signal intensity was quantified using ImageJ software (http://rsbweb.nih.gov/ij/).
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