The TATGARAT box of the HSV-1 ICP27 gene is essential for immediate early expression but not critical for efficient replication in vitro or in vivo.

The TATGARAT box of the HSV-1 ICP27 gene is essential for immediate early expression but not critical for efficient replication in vitro or in vivo.
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HSV-1 ICP27 基因的 TATGARAT 盒对于立即早期表达至关重要,但对于体外或体内的有效复制并不重要。

DOI:
10.1007/s11262-004-7437-9
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发表时间:
2004
期刊:
影响因子:
1.6
通讯作者:
Wager,EK
Wager,EK
中科院分区:
医学4区
文献类型:
--
作者:
Sun,Aixu;Devi-Rao,GV;Rice,MK;Gary,LW;Bloom,DC;Sandri-Goldin,RM;Wagner,P;Wager,EK

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我们构建了一种重组病毒,该病毒含有改变 HSV-1 ICP27 转录物早期立即表达的启动子突变,ICP27ΔSma,其中包含“TATGARAT”和周围序列的删除,但保留了 ICP27 启动子的其余部分。使用在缺乏从头蛋白质合成和动力学级联中最早表达的情况下的表达标准,该突变体不表现出ICP27的立即早期表达。虽然小鼠胚胎成纤维细胞中 0.1 PFU/细胞感染后 1 小时的转录物丰度与 wt-rescue 感染相比显着改变,但到感染后 4 小时,这些差异已减少或消失。与这一观察结果一致,与最早测试时的拯救感染相比,突变体中一些关键蛋白质的水平有所降低,但在感染后 8-12 小时内水平相同。此外,单步和多步病毒复制对于突变体和拯救都是等效的。因此,改变 ICP27 的早期动力学会导致基因表达出现次优的定量滞后期,但不会影响体外复制的适应性。体内感染还表明,在足垫注射后,突变病毒和救援病毒侵入小鼠 CNS 的能力是相同的。根据这些观察结果讨论了早期 ICP27 表达的作用的性质。
We constructed a recombinant virus containing a promoter mutation altering the immediate-early expression of the HSV-1 ICP27 transcript, ICP27ΔSma, which contains a deletion of the “TATGARAT” and surrounding sequences, but retains the rest of the ICP27 promoter. This mutant does not exhibit immediate-early expression of ICP27 using criteria of expression in the absence of de novo protein synthesis and earliest expression in the kinetic cascade. While transcript abundance at 1h after infection at 0.1 PFU/cell in mouse embryo fibroblasts was significantly altered compared to infections withwt-rescues, by 4h after infection these differences were diminished or absent. Consistent with this observation, levels of some critical proteins were reduced in the mutant as compared to rescue infections at the earliest times tested, but were equivalent by 8–12h pi. Further, both single and multi-step virus replication was equivalent with both mutants and rescues. Thus, altering the immediate early kinetics of ICP27 leads to a sub-optimal quantitative lag-phase in gene expression but without consequence to replication fitnessin vitro.Infectionsin vivoalso revealed the ability of mutant and rescue virus to invade the CNS of mice following footpad injections was equivalent. The nature of the role of immediate-early ICP27 expression is discussed in light of these observations.
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