Human Herpesvirus 6 Glycoprotein Complex Formation Is Required for Folding and Trafficking of the gH/gL/gQ1/gQ2 Complex and Its Cellular Receptor Binding

Human Herpesvirus 6 Glycoprotein Complex Formation Is Required for Folding and Trafficking of the gH/gL/gQ1/gQ2 Complex and Its Cellular Receptor Binding
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人类疱疹病毒 6 糖蛋白复合物的形成是 gH/gL/gQ1/gQ2 复合物及其细胞受体结合的折叠和运输所必需的

DOI:
10.1128/jvi.05251-11
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发表时间:
2011
影响因子:
5.4
通讯作者:
Y. Mori
Y. Mori
中科院分区:
医学2区
文献类型:
--
作者:
Huamin Tang;M. Hayashi;Takahiro Maeki;K. Yamanishi;Y. Mori

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摘要 人类疱疹病毒 6 (HHV-6) 是一种 T 细胞嗜性乙型疱疹病毒。 HHV-6 特有的糖蛋白 (g) 复合物 gH/gL/gQ1/gQ2 是其细胞受体人 CD46 的病毒配体。然而,CD46 结合是否需要复合物形成或复合物的一种成分以及复合物如何在细胞中转运仍是悬而未决的问题。此外,在 HHV-6 感染的细胞中,用 N 连接聚糖修饰的 gQ1 蛋白以两种不同分子量的形式表达:80 kDa 形式 (gQ1-80K) 和 74 kDa 形式 (gQ1-74K)。只有gQ1-80K,而不是gQ1-74K,与gQ2、gH和gL形成复合物,并且这种四组分复合物被掺入成熟病毒体中。在这里,我们通过在 293T 细胞中表达单个 gH/gL/gQ1/gQ2 成分的组合来表征导致 gQ1 成熟的分子背景。令人惊讶的是,只有当所有四种分子都表达时,才检测到大量的 gQ1-80K,这表明所有其他三种分子(gQ2、gH 和 gL)对于 gQ1 成熟都是必要且充分的。我们还发现只有四聚体复合物而不是其子集与 CD46 结合。最后,在BAC(细菌人工染色体)系统中构建的gQ2无效病毒无法重建,这表明gQ2对于病毒生长至关重要。这些结果表明,gH、gL、gQ1 和 gQ2 对于 gH/gL/gQ1/gQ2 复合物的运输和正确折叠至关重要,因此对于 HHV-6 感染也至关重要。
ABSTRACT Human herpesvirus 6 (HHV-6) is a T-cell-tropic betaherpesvirus. A glycoprotein (g) complex that is unique to HHV-6, gH/gL/gQ1/gQ2, is a viral ligand for its cellular receptor, human CD46. However, whether complex formation or one component of the complex is required for CD46 binding and how the complex is transported in cells are open questions. Furthermore, in HHV-6-infected cells the gQ1 protein modified with N-linked glycans is expressed in two forms with different molecular masses: an 80-kDa form (gQ1-80K) and a 74-kDa form (gQ1-74K). Only gQ1-80K, but not gQ1-74K, forms the complex with gQ2, gH, and gL, and this four-component complex is incorporated into mature virions. Here, we characterized the molecular context leading to the maturation of gQ1 by expressing combinations of the individual gH/gL/gQ1/gQ2 components in 293T cells. Surprisingly, only when all four molecules were expressed was a substantial amount of gQ1-80K detected, indicating that all three of the other molecules (gQ2, gH, and gL) were necessary and sufficient for gQ1 maturation. We also found that only the tetrameric complex, and not its subsets, binds to CD46. Finally, a gQ2-null virus constructed in the BAC (bacterial artificial chromosome) system could not be reconstituted, indicating that gQ2 is essential for virus growth. These results show that gH, gL, gQ1, and gQ2 are all essential for the trafficking and proper folding of the gH/gL/gQ1/gQ2 complex and, thus, for HHV-6 infection.
DOI: 10.1093/infdis/162.4.852
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期刊: VIROLOGY
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发表时间: 2009-03
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影响因子: --
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通讯作者: Longnecker R