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4 protocols using v5 antibody

1

Western Blot Antibody Profiling

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Antibodies against Nudt2 (#10484-1-AP, dilution 1:1000, Proteintech, Biotest, Kfar Saba, Israel), β-Actin (#A1978, dilution 1:10,000, Sigma-Aldrich, Jerusalem, Israel), V5-antibody (#v8012, dilution 1:2000, Sigma Aldrich), vimentin antibody (#5741T, dilution 1:2000, Cell Signaling, Jerusalem, Israel), N cadherin antibody (#13116, dilution 1:2000, Cell Signaling, Jerusalem, Israel), MMP9 antibody (#13667, dilution 1:2000, Cell Signaling, Jerusalem, Israel), and Snail antibody (#3879, dilution 1:2000, Cell Signaling, Jerusalem, Israel) were used.
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2

Immunoprecipitation of cell surface receptors

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A detailed experimental procedure is described in the supplement. In brief, intact 293T cells on ice were incubated with cold FLAG-AP-NDP conditioned medium, or V5-antibody (AbD Serotec) in cold medium, washed, and lysed. FLAG-AP-NDP or V5-antibody bound to the receptor complex at the cell surface was isolated using anti-FLAG beads (Sigma) or ProteinA/G beads (Pierce), respectively. Samples were analysed by immunoblot.
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3

OLIG2 Protein Purification and Characterization

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OLIG2-V5-HIS cDNA was transiently transfected into COS-7 cells using the pcDNA3.1 vector. Cells were lysed in hypotonic lysis buffer (50 mM Tris-HCl at pH 7.5, 0.2% [v/v] NP-40, 5 mM EDTA) and then high salt buffer (final concentration: 10 mM HEPES, 420 mM NaCl, 0.2 mM EDTA). OLIG2 protein was then purified from cellular lysates by immunoprecipiation with V5 antibody (Sigma), V5 peptide (Sigma) elution, affinity purification with Ni-NTA beads (Qiagen), and elution in 200 mM imidazole and Buffer A (50 mM Tris at pH 7.5, 150 mM KCl, 5 mM MgCl2, 10% [v/v] glycerol, 0.1% [v/v] NP40, and protease inhibitors).
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4

Immunoprecipitation and Degradation Assay

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Cells were washed in PBS and lysed in NETN buffer, in the presence of phosphatase (PhosSTOP; Roche) and protease (Complete EDTA free tablets; Roche, Indianapolis, IN) inhibitors. The concentration of proteins were determined by PierceTM BCA (Thermo Scientific, Rockford, IL). Magnetic Beads (SIGMA-ALDRICH, St Louis, MO) were coated with anti-HA antibody (HA1.1, Covance) for 30min (RT). For immunoprecipitation, cell lysates were incubated with the beads coated with anti-HA for 1h at 4°C. Beads were washed 3 times with NETN buffer and proteins were eluted in Lamelli buffer and boil for 10min. Samples were subjected to SDS-PAGE on 4–12% acrylamide gel Criteron™ TGX gel (Bio-Rad, Hercules, CA) and transferred to PVDF membrane (EMD Millipore, Billerica, MA). For degradation assay, cells were lysed using SET buffer (1% SDS, 50mM tris-HCl, pH 7.4, 1mM EDTA) and boiled for 20min. Samples were resolves by SDS-PAGE as described above. V5 antibody (Sigma Aldrich), β-actin (Sigma Aldrich), rabbit polyclonal DCAF1 antibody was kindly provided by Dr. Ling-Jun Zhao (Saint Louis University).
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