Journal: Nucleic Acids Research
Article Title: Coronavirus S protein alters dsRNA accumulation and stress granule formation through regulation of ADAR1-p150 expression
doi: 10.1093/nar/gkae921
Figure Lengend Snippet: The S protein of mutant PEDV inhibits PKR phosphorylation and SG formation by upregulating ADAR1-p150 expression, and the Zα domain plays a crucial role in exerting inhibitory effects. Vero cells were transfected with 12-S or 12S-N29T. At 24 h post-transfection, the expression levels of PACT, ADAR1, PEDV-S and β-actin were detected ( A ). The transfected cells were also fixed and incubated with anti-PEDV-S and anti-ADAR1-p150/110 or anti-ADAR1-p150 ( B and D ), and the mean fluorescence values of ADAR1 per cell were determined in 20 random cells ( C and E ). Vero cells were transfected with the recombinant plasmid pADAR1-p150. At 18 h post-transfection, the cells were transfected with poly I:C for 6 h, and then the expression levels of ADAR1-p150, PKR, pPKR and β-actin were detected ( F ). The cells were also fixed and incubated with an anti-His antibody and an anti-G3BP1 antibody ( G ). The percentages of inhibition of SG formation relative to ADAR1-p150 expressing cells were displayed in the bar graph ( H ). ( I ) A schematic diagram of the structural composition of ADAR1-p150 and the constructed mutants is shown. Vero cells were transfected with mutant ADAR1-p150 plasmids. At 18 h post-transfection, the cells were transfected with poly I:C for 6 h, then fixed and incubated with anti-His and anti-G3BP1 antibodies ( J ). The percentages of inhibition of SG formation relative to mutant ADAR1-p150 expressing cells were displayed in the bar graph ( K ). Vero cells were transfected with siADAR1 or siNC for 24 h, then all cells were transfected with 12-S. At another 18 h post-transfection, cells were transfected with poly I:C for 6 h, then the expression of ADAR1-p150 was detected by western blot ( L ). Fixed cells were incubated with anti-PEDV-S and anti-G3BP1 antibodies ( M ). The percentages of inhibition of SG formation relative to 12-S expressing cells were displayed in the bar graph ( N ). For (A) and (F), the figures are representative of two independent experiments. For (B), (D), (G), (J) and (M), the images are representative of three independent experiments. The relative expression levels of target proteins according to the grayscale of β-actin in cells were also determined by ImageJ. The bar graphs of (H), (K) and (N) showed the data of three independent experiments, presented as mean ± SD. Statistics: Student’s t -test (*** P < 0.001). Scale bars: 10 μm.
Article Snippet: Rabbit monoclonal anti-ADAR1-p150 (A11466), anti-general control nonderepressible-2 (anti-GCN2) (A2307), anti-phospho-GCN2-T899 (AP1356) and anti-heme-regulated inhibitor (anti-HRI) (A24614) antibodies were purchased from ABclonal, Inc. (Wuhan, China).
Techniques: Mutagenesis, Expressing, Transfection, Incubation, Fluorescence, Recombinant, Plasmid Preparation, Inhibition, Construct, Western Blot