Identification and characterization of a DNA binding domain on the adenovirus IVa2 protein.

Identification and characterization of a DNA binding domain on the adenovirus IVa2 protein.
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DOI:
10.1016/j.virol.2012.07.013
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发表时间:
2012-11-10
期刊:
影响因子:
3.7
通讯作者:
Imperiale MJ
Imperiale MJ
中科院分区:
医学3区
文献类型:
--
作者:
Christensen JB;Ewing SG;Imperiale MJ

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腺病毒IVa2蛋白被认为是病毒主要晚期启动子(MLP)的转录激活因子,也是病毒基因组包装的关键成分。IVa2通过其与病毒L1 52/55 kDa蛋白形成复合物的能力在包装中起作用,这是包衣所必需的。IVa2单独或与另一种病毒蛋白L4 22K蛋白结合,与病毒基因组上的包装序列和启动子中的特定元件结合。为了确定IVa2上的DNA结合结构域并确定其对病毒生命周期的贡献,我们创建了一个突变蛋白,该蛋白在极端c端缺乏假定的螺旋-转-螺旋基序。该突变蛋白的表征表明,虽然MLP活性相对不受影响,但它无法结合和包装DNA。
The adenovirus IVa2 protein has been implicated as a transcriptional activator of the viral major late promoter (MLP) and a key component in the packaging of the viral genome. IVa2 functions in packaging through its ability to form a complex with the viral L1 52/55 kDa protein, which is required for encapsidation. IVa2, alone and in conjunction with another viral protein, the L4 22K protein, binds to the packaging sequence on the viral genome and to specific elements in the promoter. To define the DNA binding domain on IVa2 and determine its contribution to the viral life cycle, we created a mutant protein that lacks a putative helix-turn-helix motif at the extreme C-terminus. Characterization of this mutant protein showed that while MLP activity is relatively unaffected, it is unable to bind to and package DNA.
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