Differential localization and turnover of infectious bronchitis virus 3b protein in mammalian versus avian cells.

Differential localization and turnover of infectious bronchitis virus 3b protein in mammalian versus avian cells.
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DOI:
10.1016/j.virol.2005.09.069
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发表时间:
2006-02-20
期刊:
影响因子:
3.7
通讯作者:
Machamer CE
Machamer CE
中科院分区:
医学3区
文献类型:
--
作者:
Pendleton AR;Machamer CE

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传染性支气管炎病毒(IBV) 3b蛋白在第3组冠状病毒中高度保守,提示其对感染很重要。先前的一份报告(病毒学2003,31:16 - 27)表明,利用牛痘病毒表达系统,转染的IBV 3b在哺乳动物细胞中定位到细胞核。虽然我们证实了这些发现,但我们观察到IBV 3b的细胞质定位明显排除在禽类细胞的细胞核外(IBV通常感染鸡)。在未转染牛痘病毒的哺乳动物细胞和感染IBV的哺乳动物细胞中,显微镜几乎检测不到IBV 3b,因为这些细胞的半衰期大大缩短。一种蛋白酶体抑制剂稳定了哺乳动物细胞中的IBV 3b,但对禽类细胞中的IBV 3b影响不大,提示IBV 3b在哺乳动物细胞中的快速周转依赖于蛋白酶体,而在禽类细胞中的周转可能不依赖于蛋白酶体。我们的研究结果强调了在研究冠状病毒非结构蛋白时使用来自天然宿主的细胞的重要性。
Infectious bronchitis virus (IBV) 3b protein is highly conserved among group 3 coronaviruses, suggesting that it is important for infection. A previous report (Virology 2003, 311:16–27) indicated that transfected IBV 3b localized to the nucleus in mammalian cells using a vaccinia-virus expression system. Although we confirmed these findings, we observed cytoplasmic localization of IBV 3b with apparent exclusion from the nucleus in avian cells (IBV normally infects chickens). IBV 3b was virtually undetectable by microscopy in mammalian cells transfected without vaccinia virus and in IBV-infected mammalian cells because of a greatly reduced half-life in these cells. A proteasome inhibitor stabilized IBV 3b in mammalian cells, but had little effect on IBV 3b in avian cells, suggesting that rapid turnover of IBV 3b in mammalian cells is proteasome-dependent while turnover in avian cells may be proteasome-independent. Our results highlight the importance of using cells derived from the natural host when studying coronavirus non-structural proteins.
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发表时间: 2002-02-01
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