Abstract
The Epstein-Barr virus (EBV) BMRF1 protein is a DNA polymerase processivity factor. We have deleted the BMRF1 open reading frame from the EBV genome and assessed the DeltaBMRF1 EBV phenotype. DeltaBMRF1 viruses were replication deficient, but the wild-type phenotype could be restored by BMRF1 trans-complementation. The replication-deficient phenotype included impaired lytic DNA replication and late protein expression. DeltaBMRF1 and wild-type viruses were undistinguishable in terms of their ability to transform primary B cells. Our results provide genetic evidence that BMRF1 is essential for lytic replication of the EBV genome.
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