Kaposi's sarcoma-associated herpesvirus ori-Lyt-dependent DNA replication: involvement of host cellular factors

Journal of Virology
Yan WangYan Yuan

Abstract

Herpesvirus lytic DNA replication requires both the cis-acting element, the origin, and trans-acting factors, including virally encoded origin-binding protein, DNA replication enzymes, and auxiliary factors. Two lytic DNA replication origins (ori-Lyt) of Kaposi's sarcoma-associated herpesvirus (KSHV) have been identified, and two virally encoded proteins, namely, RTA and K8, have been shown to bind to the origins. In this study, we sought to identify cellular factors that associate with ori-Lyt by using DNA affinity purification and mass spectrometry. This approach led to identification of several cellular proteins that bind to KSHV ori-Lyt. They include topoisomerases (Topo) I and II, MSH2/6, RecQL, poly(ADP-ribose) polymerase I (PARP-1), DNA-PK, Ku86/70 autoantigens, and scaffold attachment factor A (SAF-A). RecQL appears to associate with prereplication complexes and be recruited to ori-Lyt through RTA and K8. Topoisomerases, MSH2, PARP-1, DNA-PK, and Ku86 were not detected in prereplication complexes but were present in replication initiation complexes on ori-Lyt. All these cellular proteins accumulate in viral replication compartments in the nucleus, indicating that these proteins may have a role in viral replication. Topo...Continue Reading

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