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

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

鼠γ鞘病毒68的裂解复制的左起源的鉴定和功能表征。

DOI:
10.1016/j.virol.2009.02.029
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发表时间:
2009-05-10
期刊:
影响因子:
3.7
通讯作者:
Deng, Hongyu
Deng, Hongyu
中科院分区:
医学3区
文献类型:
--
作者:
Gong, Danyang;Qi, Jing;Arumugaswami, Vaithilingaraja;Sun, Ren;Deng, Hongyu

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鼠γ疱疹病毒68(MHV-68)在细胞培养中稳健复制,为研究肿瘤相关疱疹病毒从头感染期间的病毒基因组复制提供了模型。我们以前已经确定了一个1.25 kb的裂解复制起点(oriLyt)的MHV-68。为了进一步研究病毒基因组复制的分子机制,我们首先使用转座子介导的高密度诱变方法从该oriLyt片段中精细定位必需的顺式元件。该结果为我们使用从头感染-复制测定法鉴定位于MHV-68基因组左端的第二个oriLyt提供了信息。我们通过扫描缺失分析和定点突变进一步表征了这一左oriLyt,并表明几个CCAAT基序对oriLyt功能至关重要,而富含AT的区域增强了复制。然而,富含GC的重复序列不是重要的顺式元件。此外,我们确定了一个细胞转录因子,NF-Y,它结合到CCAAT框在EMSA和相关的oriLyt在ChIP检测。使用显性负性表达质粒,我们证明了NF-Y在介导MHV-68基因组复制过程中起着重要作用。
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.
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