Structures and mechanisms in flavivirus fusion.

Structures and mechanisms in flavivirus fusion.
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DOI:
10.1016/s0065-3527(00)55005-2
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发表时间:
2000
影响因子:
--
通讯作者:
Allison SL
Allison SL
中科院分区:
医学2区
文献类型:
--
作者:
Heinz FX;Allison SL

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本章重点介绍壁虱传播的脑炎病毒(TBE)所开展的工作,该病毒是黄病毒最具结构特征的病毒。这些数据与其他黄病毒获得的数据有关,这些病毒被认为具有保守的结构组织,并将黄病毒融合的特征与其他包膜病毒的特征进行了比较。来自正粘病毒科、副粘病毒科、逆转录病毒科和丝状病毒科等几个不同病毒科的融合蛋白显示出惊人的结构相似性;它们都使用共同的机制来诱导膜融合,并且相同的通用模型适用于所有这些病例。黄病毒基因组是一种正链RNA分子,由一个长达10,000多个核苷酸的单一开放阅读框组成,5‘端和3’端各有一个非编码区。用几种不同的检测系统研究了黄病毒的融合特性,包括病毒诱导的细胞-细胞融合和病毒-脂质体融合。所有这些研究都表明,黄病毒需要酸性的pH才能融合,这与它们建议的进入模式一致。
This chapter focuses on the work carried out with tick-borne encephalitis (TBE) virus, the structurally best characterized of the flaviviruses. The data is related to those obtained with other flaviviruses, which are assumed to have a conserved structural organization, and compare the characteristics of flavivirus fusion to those of other enveloped viruses. Fusion proteins from several different virus families, including Orthomyxoviridae, Paramyxoviridae, Retroviridae, and Filoviridae have been shown to exhibit striking structural similarities; they all use a common mechanism for inducing membrane fusion, and the same general model applies to all of these cases. The flavivirus genome is a positive-stranded RNA molecule consisting of a single, long open reading frame of more than 10,000 nucleotides flanked by noncoding regions at the 5′ and 3′ ends. The fusion properties of flaviviruses have been investigated using several different assay systems, including virus-induced cell–cell fusion and virus–liposome fusion. All of these studies indicate that flaviviruses require an acidic pH for fusion, consistent with their proposed mode of entry.
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