Article Title: Rab18 binds to classical swine fever virus NS5A and mediates viral replication and assembly in swine umbilical vein endothelial cells
Figure Lengend Snippet: Rab18 binds to CSFV NS5A. (a) Co-immunoprecipitation (co-IP) assay. Cells were transfected with pcDNA-NS2-Myc or pcDNA-NS5A-Myc for 48 h. The transfected cells were lysed and immunoprecipitated, and western blot analysis was conducted using anti-Myc, anti-Rab18, and anti-β-actin. (b) GST-pulldown assay. GST or GST-Rab18 fusion proteins expressed in E. coli BL21 (DE3) were purified with glutathione agarose resin and incubated with the lysate of NS5A-Myc-expressing cells. Western blot analysis using anti-GST, anti-Myc, and anti-β-actin. (c) Exogenous NS5A-Myc binds to Rab18-Flag, S22N-Flag, and Q67 L-Flag in co-transfected cells. pcDNA-NS5A-Myc with pCDNA3.1-Rab18-Flag-, pCDNA3.1-S22N-Flag-, and pCDNA3.1-Q67L-Flag-transfected cells were lysed and immunoprecipitated. Then, western blot analysis was conducted using anti-Myc, anti-Flag, and anti-β-actin. pcDNA-NS2-Myc with pCDNA3.1-Rab18-Flag was used as a negative control. (d) Rab18 co-localization with CSFV NS5A protein. Cells were co-transfected with NS5A-GFP and Rab18-Red, NS5A-GFP and Q67L-Red, and NS5A-GFP and S22N-Red. Plasmids pEGFP-N1 and pCDNA-Red were co-transfected as a control. At 48 h after transfection, cells were fixed in 4% paraformaldehyde and stained with DAPI to label nuclei (blue). Scale bars, 10 μm.
Article Snippet: GST-pulldown assaysThe plasmids pGEX-6p-1 and pGEX-GST-Rab18 were transformed into BL21 competent cells (Invitrogen, Carlsbad, CA, United States) to obtain GST and GST-Rab18 proteins, respectively.
Techniques: Co-Immunoprecipitation Assay, Transfection, Immunoprecipitation, Western Blot, GST Pulldown Assay, Purification, Incubation, Expressing, Negative Control, Staining