Common importin alpha specificity for papillomavirus E2 proteins.

Common importin alpha specificity for papillomavirus E2 proteins.
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DOI:
10.1016/j.virusres.2010.02.011
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发表时间:
2010-06
期刊:
影响因子:
5
通讯作者:
Wilson, Van G.
Wilson, Van G.
中科院分区:
医学3区
文献类型:
--
作者:
Bian, Xue-Lin;Wilson, Van G.

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乳头瘤病毒感染角质形成细胞,其繁殖与皮肤的分化有关。乳头瘤病毒的 E2 蛋白是一种多功能早期蛋白,可特异性结合病毒 DNA,调节基因组转录、复制和分离。所有这些都是核事件,需要将 E2 特异性转运到宿主细胞核中。核定位信号 (NLS) 序列已被绘制为几种 E2 蛋白的图谱,这些序列类似于与称为 α 输入蛋白的细胞转运接头分子相互作用的基序。为了确定哪些输入蛋白可以携带 E2 蛋白,使用三种不同的 E2 蛋白和五种普遍存在的 α 输入蛋白进行了体外结合研究。 E2 蛋白优先与 α 输入蛋白 3 和 5 相互作用,并且与其他三种广泛表达的 α 输入蛋白(α1、α4 和 α7)表现出非常弱或没有相互作用。虽然所有五种α输入蛋白似乎在角质形成细胞中组成型表达,但在人角质形成细胞系(HaCaT)的分化过程中,我们观察到α3和α5表达的特异性增加。α3和α5表达的这种分化特异性增加表明E2优先使用这两种输入蛋白可能促进终末分化期间E2核摄取。
Papillomaviruses infected keratinocytes and their reproduction is tied to differentiation of the skin. The E2 protein of papillomaviruses is a multifunctional early protein that binds specifically to the viral DNA to regulate genome transcription, replication, and segregation. All of these are nuclear events that require specific transport of E2 into the host nucleus. Nuclear localization signal (NLS) sequences have been mapped for several E2 proteins, and these sequences resemble motifs that interact with cellular transport adaptor molecules termed alpha importins. To determine which importins could carry E2 proteins, in vitro binding studies were performed with three different E2 proteins and the five ubiquitous alpha importins. The E2 proteins preferentially interacted with alpha importins 3 and 5, and showed very weak or no interaction with the other three widely expressed alpha importins (α1, α4, and α7). While all five alpha importins appear to be constitutively expressed in keratinocytes, during differentiation of a human keratinocyte line (HaCaT) we observed a specific increase in expression of alphas 3 and 5. This differentiation-specific increase in α3 and α5 expression suggests that preferential usage of these two importins by E2 may facilitate E2 nuclear uptake during terminal differentiation.
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