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5 protocols using monoclonal anti mbp antibody

1

MBP-TcpF Protein Internalization in Macrophages

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RAW264.7 macrophages were seeded in 12-well plates, grown to confluence, and then inoculated with 10 µg/ml or 50 µg/ml purified MBP-TcpF or purified MBP control protein for 5 hours at 37°C. Cells were then washed five times with cold PBS and lysates prepared after treatment with trypsin at a final concentration of 0.25% for 5 minutes at 37°C. Proteins from cell lysate were resolved on a 10% SDS polyacrylamide gel and transferred to PVDF membrane. The membrane was blocked with 5% milk and probed first with anti-MBP monoclonal antibody (New England Biolabs, Ipswich, MA) overnight at 4°C followed by goat anti-mouse IgG conjugated to HRP. Bound antibody was detected using a chemiluminescent detection kit (Thermo Scientific, Rockford, IL).
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2

Western Blot Analysis of E. coli Proteins

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Total protein of whole E. coli cells (2.5 × 107) or membrane proteins (2 µg) of the membrane homogenates were separated by 10% Bis-Tris SDS-PAGE and transferred to a 0.45 µm nictrocellulose membrane (Sartorius, Göttingen, Germany). The membrane was blocked with 3% BSA in 1x TBS (20 mM Tris, pH 7.4, 150 mM NaCl), 0.1% (v/v) Tween20 for 1 h at room temperature. After washing the membrane (1x TBS, 0.1% (v/v) Tween 20) it was incubated with anti-MBP monoclonal antibody (1:10,000) (New England Biolabs, Frankfurt a. M., Germany), for 1 h at room temperature in 1x TBS, 0.2% (w/v) BSA, 0.1% (v/v) Tween 20. Anti-mouse IgE-alkaline phosphatase antibody (1:20,000) (Sigma-Aldrich, Taufkirchen, Germany) was added and the membrane was incubated further for 1 h at room temperature. The blot was developed using 4.2 mg/mL NBT and 2.1 mg/mL BCIP as a substrate in 100 mM Tris/HCl, pH 9.5, 100 mM NaCl, 5 mM MgCl2.
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3

Immunoblotting Antibody Detection Protocol

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Primary and secondary antibodies used in the immunoblotting are as follows: monoclonal anti-MBP antibody (New England Biolabs, E8032S, 1:10,000 dilution), monoclonal, horseradish peroxidase (HRP)–conjugated, anti-GST antibody (B-14) (Santa Cruz Biotechnology, sc-138 HRP, 1:1000), monoclonal anti-Myc antibody (Cell Signaling Technology, 71D10, 1:3000 dilution), monoclonal, HRP-conjugated, anti-GFP antibody (Miltenyi Biotec, 130-091-833, 1:3000 dilution), monoclonal anti–α-tubulin antibody (Santa Cruz Biotechnology, sc-5286 HRP, 1:1000), anti-mouse immunoglobulin G (IgG)–peroxidase antibody (Sigma-Aldrich, A9044, 1:5000), and anti-rabbit IgG, HRP-linked antibody (Cell Signaling Technology, 7074, 1:5000 dilution). Signal detection was performed with the SuperSignal West Dura Extended Duration Substrate (Thermo Fisher Scientific).
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4

Tricine-SDS-PAGE and Western Blotting of MBP Fusions

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Proteins were separated using Tricine-SDS-polyacrylamide (10%) gel electrophoresis under reducing (1× sample buffer containing 10 mM DTT) conditions51 (link); an all blue prestained protein standard was obtained from Bio-Rad. Molecular weights of standard proteins are marked on the side of the gel pictures. For documentation, destained gels were scanned using an Epson Perfection V850 Pro scanner with 1200 d.p.i. resolution. Proteins were electrophoretically transferred to PVDF membrane (Immobilon-FL, Merck Millipore) after SDS-PAGE by semi-dry blotting. MBP fusions were detected with a monoclonal anti-MBP antibody (New England Biolabs, diluted 1:4000) as first antibody, an Alexa 680 goat-anti-mouse antibody (Life Technologies, Thermo Fischer Scientific, 0.8 µg ml−1) as secondary antibody and then using the Odyssey Imaging System (Li-Cor Biosciences).
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5

Analyzing BZR1 and MAPK Activation

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For BZR1 and MAPK activation analyses, total protein samples were extracted from 7-day-old seedlings or 12-day-old seedlings using 2x SDS sample buffer and separated on SDS-PAGE gels. Proteins were transferred to a nitrocellulose membrane and probed with a monoclonal anti-GFP antibody (Clontech; 1:2000 dilution) or anti-phosphop44/42 mitogen-activated protein kinase (Erk1/2) (Thr202/Tyr204) antibody (Cell Signaling; 1:1000 dilution).
For overlay assays, GST-BRI1-K, GST-BAK1-K, GST-BIN2, GST-BSK1 (Tang et al., 2008 (link)) and MBP-FKBP42 were expressed in E. coli and purified using glutathione agarose beads (GE Healthcare) or amylase agarose beads (New England Biolabs) as previously described (Tang et al., 2008 (link)). To test the interaction of FKBP42 with BR signaling components in vitro, GST, GST-BRI1-K, GST-BAK1-K, GST-BIN2, and GST-BSK1 were separated by SDS-PAGE and blotted on nitrocellulose membrane. The blot was then incubated with MBP-FKBP42 (4 μg) in 5% non-fat dry milk/PBS buffer for one hour, washed three times, and then probed with a monoclonal anti-MBP antibody (New England Biolabs, 1:4000) for one hour. Overlay signal was detected using the SuperSignal West Dura chemiluminescence reagent (Pierce).
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