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Kaposi's sarcoma (KS)-associated herpesvirus is the causative agent of multiple malignancies, predominantly in immunocompromised individuals, including HIV/AIDS patients. Reduced incidence of KS in HIV/AIDS patients receiving antiherpetic drugs to block lytic replication confirms the role of lytic DNA replication and gene products in KSHV-mediated tumorigenesis. Herpesvirus lytic replication results in the production of complex concatemeric DNA, which is cleaved into unit length viral DNA for packaging into the infectious virions. The conserved herpesviral alkaline exonucleases play an important role in viral genome cleavage and packaging. Here, by using the previously described Q129H mutant virus that selectively lacks DNase activity but retains host shutoff activity, we provide experimental evidence confirming that the DNase function of the KSHV SOX protein is essential for viral genome processing and packaging and capsid maturation into the cytoplasm during lytic replication in infected cells. This led to the identification of ORF37’s DNase activity as a potential target for antiviral therapeutics.

The DNase Activity of Kaposi’s Sarcoma-Associated Herpesvirus SOX Protein Serves an Important Role in Viral Genome Processing during Lytic Replication