MNV infection phosphorylates eIF2α and shuts down host cell translation. (A) BMMs were uninfected, uninfected but NaAs treated (250 μM for 20 min), or MNV infected (MOI of 5) for 12 h. The WB was immunolabeled with anti-NS7, anti-p-eIF2α, and anti-eIF2α antibodies. Nonspecific lanes were removed to generate the image. (B) Immunoblot analysis of uninfected, uninfected/NaAs-treated (250 μM for 20 min), or MNV-infected (MOI of 5) cell lysates harvested at 3, 6, 9, and 12 hpi. The WB was immunolabeled with anti-NS7, anti-p-eIF2α and anti-actin antibodies. (C and D) BMM cells were either infected with MNV (MOI of 5) or left uninfected and analyzed for their translation using puromycin (10 μg/ml). (C) Immunoblot analysis of puromycin-treated (20 min) cell lysates harvested at 3, 6, 9, 12, and 15 hpi. The WB was immunolabeled with anti-puromycin, anti-NS7, anti-p-eIF2α, and anti-actin antibodies. (D) IF analysis of puromycin-treated (10 μg/ml for 30 min) cells at 6, 9, and 12 h postinfection. Cells were stained with anti-puromycin, anti-NS5, and DAPI for the merged image. Asterisks indicate uninfected cells displaying a high signal for anti-puromycin. Samples were analyzed via the Zeiss LSM 710 confocal microscope and analyzed with ZEN software. (E) Quantification of puromycin raw integrated density (RawIntDen) level of mock-infected and MNV-infected cells at 6, 9, and 12 hpi. 6 hpi, mock, n = 113, bystander, n = 108, and MNV, n = 38; 9 hpi, mock, n = 125, bystander, n = 108, and MNV, n = 40; 12 hpi, mock, n = 260, bystander, n = 148, and MNV, n = 81. Means ± the SEM are shown, and an unpaired two-tailed t test was performed. ****, P < 0.0001.