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

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 I and II appear to be essential for viral DNA replication as inhibition of their activities with specific inhibitors (camptothecin and ellipticine) blocked ori-Lyt-dependent DNA replication. Furthermore, inhibition of PARP-1 with chemical inhibitors (3-aminobenzamide and niacinamide) resulted in decreased ori-Lyt-dependent DNA replication, whereas hydroxyurea, which raises PARP-1 activity, caused an increase in the DNA replication, suggesting a positive role for PARP-1 in KSHV lytic DNA replication.

journal_name

J Virol

journal_title

Journal of virology

authors

Wang Y,Li H,Tang Q,Maul GG,Yuan Y

doi

10.1128/JVI.01319-07

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

2867-82

issue

6

eissn

0022-538X

issn

1098-5514

pii

JVI.01319-07

journal_volume

82

pub_type

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