Disruption of the BGLF2 gene decreased infectious progeny production.

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Disruption of the BGLF2 gene decreased infectious progeny production. Disruption of the BGLF2 gene decreased infectious progeny production. (A) Schematic representation of the EBV-BAC recombination procedures. The asterisk in the dBGLF2stop strain indicates a stop codon in the viral genome. (B) Recombinant EBV-BAC genomes were digested with BamHI or EcoRI and electrophoresed on an agarose gel. (C) Protein expression in the recombinant viruses. HEK-293 cell clones that harbor the latent recombinant B95-8 EBV-BAC genome constructed above were transfected with the BZLF1 expression vector by electroporation. Cells were harvested at 0 and 2 days after transfection and subjected to IB. For each strain (WT, dBGLF2stop, and dBGLF2rev), the results from two representative clones are shown. (D) Lytic viral DNA synthesis of the recombinant viruses. Cells transfected as described for panel C were harvested at 0 and 2 days after transfection and subjected to qPCR to detect the EBV DNA and genomic DNA levels in the host cells. The means ± SD from three independent biological replicates are shown after normalization to the value of the host control. The day 0 value from one of the WT samples was set as 1. (E) Infectious progeny levels produced from the recombinant viruses. Cells were transfected as described for panel C, and after 3 days, cell-associated and cell-free EBV particles were titrated with Akata(−) cells by determining the GFP-positive ratio using fluorescence-activated cell sorting (FACS). The means ± SD from three independent biological replicates are shown. Natsuno Konishi et al. mSphere 2018; doi:10.1128/mSphere.00138-18