K48-linked polyubiquitination of dengue virus NS1 protein inhibits its interaction with the viral partner NS4B.

K48-linked polyubiquitination of dengue virus NS1 protein inhibits its interaction with the viral partner NS4B.
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DOI:
10.1016/j.virusres.2017.12.013
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发表时间:
2018-02-15
期刊:
影响因子:
5
通讯作者:
Rajsbaum R
Rajsbaum R
中科院分区:
医学3区
文献类型:
--
作者:
Giraldo MI;Vargas-Cuartas O;Gallego-Gomez JC;Shi PY;Padilla-Sanabria L;Castaño-Osorio JC;Rajsbaum R

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登革病毒(DENV)是黄病毒科(Flaviviridae)的成员,其通过节肢动物传播到哺乳动物物种,并在人类中引起登革热或严重登革热。DENV基因组编码多种非结构(NS)蛋白,包括NS 1。NS 1通过与包括NS 4 B在内的其他病毒蛋白相互作用在复制中发挥重要作用,然而这些相互作用在病毒感染期间如何调节尚不清楚。通过使用生物信息学,质谱分析和免疫共沉淀试验,我们发现DENV-NS 1在DENV感染期间在多个赖氨酸残基上泛素化,包括K189,这是一个以前被证明对有效DENV复制很重要的赖氨酸残基。来自体外和细胞培养实验的数据表明,登革NS 1经历了K48连接的多聚泛素链的修饰,其通常将蛋白质靶向蛋白酶体进行降解。此外,在人和蚊子感染的细胞的裂解物以及上清液中检测到泛素化的NS 1。使用去泛素化酶OTU的NS 1的泛素解缀合导致与病毒蛋白NS 4 B的相互作用增加,表明泛素化的NS 1对NS 4 B的亲和力降低。为了支持这些数据,NS 1上的K189 R突变,其废除了NS 1的氨基酸残基189上的泛素化,也增加了NS 1-NS 4 B相互作用。我们的工作描述了NS 1-NS 4 B相互作用的一种新的调节机制,并表明NS 1的泛素化可能影响DENV的复制。
Dengue virus (DENV) is a member of the Flaviviridae family, which is transmitted to mammalian species through arthropods, and causes dengue fever or severe dengue fever in humans. The DENV genome encodes for multiple nonstructural (NS) proteins including NS1. NS1 plays an essential role in replication by interacting with other viral proteins including NS4B, however how these interactions are regulated during virus infection is not known. By using bioinformatics, mass spectrometry analysis, and co-immunoprecipitation assays, here we show that DENV-NS1 is ubiquitinated on multiples lysine residues during DENV infection, including K189, a lysine residue previously shown to be important for efficient DENV replication. Data from in vitro and cell culture experiments indicate that dengue NS1 undergoes modification with K48-linked polyubiquitin chains, which usually target proteins to the proteasome for degradation. Furthermore, ubiquitinated NS1 was detected in lysates as well as in supernatants of human and mosquito infected cells. Ubiquitin deconjugation of NS1 using the deubiquitinase OTU resulted in increased interaction with the viral protein NS4B suggesting that ubiquitinated NS1 has reduced affinity for NS4B. In support of these data, a K189R mutation on NS1, which abrogates ubiquitination on amino acid residue 189 of NS1, also increased NS1-NS4B interactions. Our work describes a new mechanism of regulation of NS1-NS4B interactions and suggests that ubiquitination of NS1 may affect DENV replication.
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