Amino acid substitutions and an insertion in the spike glycoprotein extend the host range of the murine coronavirus MHV-A59.

Amino acid substitutions and an insertion in the spike glycoprotein extend the host range of the murine coronavirus MHV-A59.
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DOI:
10.1016/j.virol.2004.04.005
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发表时间:
2004-07-01
期刊:
影响因子:
3.7
通讯作者:
Holmes KV
Holmes KV
中科院分区:
医学3区
文献类型:
--
作者:
Thackray LB;Holmes KV

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小鼠冠状病毒由于其受体--小鼠癌胚抗原细胞黏附分子1a(MCEACAM1a)的刺激性糖蛋白(S)的特异性,而仅限于感染易感小鼠和小鼠细胞系。我们最近发现,S N-末端的21个氨基酸替换和7-AA插入与持续感染MHV A59株(MHV-A59)的小鼠细胞产生的一种病毒变异的扩大宿主范围有关。我们利用靶向RNA重组技术在S感染的仓鼠、猫和猴细胞中产生了与MHV-A59不同的21个氨基酸替换或7-AA插入的同基因病毒。这些病毒还在封闭的抗mCEACAM1a抗体存在的情况下感染小鼠细胞。因此,S1的N-末端区域相对较少的变化足以允许MHV-A59与小鼠和非小鼠细胞上的替代受体相互作用。
The murine coronavirus [murine hepatitis virus (MHV)] is limited to infection of susceptible mice and murine cell lines by the specificity of the spike glycoprotein (S) for its receptor, murine carcinoembryonic antigen cell adhesion molecule 1a (mCEACAM1a). We have recently shown that 21 aa substitutions and a 7-aa insert in the N-terminal region of S are associated with the extended host range of a virus variant derived from murine cells persistently infected with the A59 strain of MHV (MHV-A59). We used targeted RNA recombination (TRR) to generate isogenic viruses that differ from MHV-A59 by the 21 aa substitutions or the 7-aa insert in S. Only viruses with both the 21 aa substitutions and the 7-aa insert in S infected hamster, feline, and monkey cells. These viruses also infected murine cells in the presence of blocking anti-mCEACAM1a antibodies. Thus, relatively few changes in the N-terminal region of S1 are sufficient to permit MHV-A59 to interact with alternative receptors on murine and non-murine cells.
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