Identification and functional characterization of the left origin of lytic replication of murine gammaherpesvirus 68.

Abstract:

:Murine gammaherpesvirus 68 (MHV-68) replicates robustly in cell culture, providing a model for studying viral genome replication during de novo infection of tumor-associated herpesviruses. We have previously identified a 1.25-kb origin of lytic replication (oriLyt) for MHV-68. To further investigate the molecular mechanism of viral genome replication, we first fine-mapped essential cis-elements from this oriLyt fragment using a transposon-mediated high-density mutagenesis method. The result provided information for us to identify a second oriLyt located towards the left end of MHV-68 genome using a de novo infection-replication assay. We further characterized this left oriLyt by scanning deletion analysis and site-directed mutations, and showed that several CCAAT motifs are essential for oriLyt function, whereas an AT-rich region enhances replication. However, GC-rich repeats are not important cis-element. Moreover, we identified a cellular transcription factor, NF-Y, which binds to CCAAT boxes in EMSA and associates with oriLyt in ChIP assay. Using a dominant negative expression plasmid, we demonstrated that NF-Y plays an important role in mediating MHV-68 genome replication during de novo infection.

journal_name

Virology

journal_title

Virology

authors

Gong D,Qi J,Arumugaswami V,Sun R,Deng H

doi

10.1016/j.virol.2009.02.029

subject

Has Abstract

pub_date

2009-05-10 00:00:00

pages

285-95

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(09)00151-2

journal_volume

387

pub_type

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