Protein Disulfide Isomerase A4 Is Involved in Genome Uncoating during Human Astrovirus Cell Entry.

Protein Disulfide Isomerase A4 Is Involved in Genome Uncoating during Human Astrovirus Cell Entry.
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DOI:
10.3390/v13010053
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发表时间:
2020-12-31
期刊:
Viruses
影响因子:
--
通讯作者:
Arias CF
Arias CF
中科院分区:
其他
文献类型:
--
作者:
Aguilar-Hernández N;Meyer L;López S;DuBois RM;Arias CF

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虽然人星状病毒(HAstV)是幼儿胃肠炎的重要病原体,但旨在表征其生物学特性的研究有限,特别是关于其细胞进入过程。已经显示HAstV血清型8通过经典网格蛋白介导的内吞途径进入人细胞;然而,可能与有效病毒感染相关的细胞受体或其他细胞进入因子是未知的。在这项工作中,我们使用了远蛋白质印迹法来确定细胞蛋白相互作用的重组衣壳刺突蛋白的HAstV血清型1,2和8,在大肠杆菌中合成。我们鉴定了72 kDa蛋白质二硫键异构酶A4(PDIA 4)作为HAstV-1和-8刺突的结合配偶体,但不作为HAstV-2刺突的结合配偶体。与该观察结果一致,PDI抑制剂16 F16强烈阻断HAstV血清型1和8的感染,但不阻断血清型2的感染。PDIA 4表达的RNA干扰选择性地阻断HAstV-8的感染性。我们还表明,PDI活性不影响病毒结合或内化,但需要病毒基因组的脱壳。
Although human astroviruses (HAstVs) are important agents of gastroenteritis in young children, the studies aimed at characterizing their biology have been limited, in particular regarding their cell entry process. It has been shown that HAstV serotype 8 enters human cells by a classical clathrin-mediated endocytosis pathway; however, the cell receptor or other cell entry factors that may be relevant for an efficient viral infection are unknown. In this work we used a far-Western blotting approach to identify cellular proteins that interact with the recombinant capsid spike proteins of HAstV serotypes 1, 2, and 8, synthesized in Escherichia coli. We identified the 72 kDa protein disulfide isomerase A4 (PDIA4) as a binding partner for HAstV-1 and -8 spikes, but not for the HAstV-2 spike. In agreement with this observation, the PDI inhibitor 16F16 strongly blocked infection by HAstV serotypes 1 and 8, but not serotype 2. RNA interference of PDIA4 expression selectively blocked HAstV-8 infectivity. We also showed that the PDI activity does not affect virus binding or internalization but is required for uncoating of the viral genome.
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