Dynamic oscillation of translation and stress granule formation mark the cellular response to virus infection.

Dynamic oscillation of translation and stress granule formation mark the cellular response to virus infection.
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翻译和应力颗粒形成的动态振荡标志着细胞对病毒感染的反应。

DOI:
10.1016/j.chom.2012.05.013
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发表时间:
2012-07-19
影响因子:
30.3
通讯作者:
Bartenschlager R
Bartenschlager R
中科院分区:
医学1区
文献类型:
--
作者:
Ruggieri A;Dazert E;Metz P;Hofmann S;Bergeest JP;Mazur J;Bankhead P;Hiet MS;Kallis S;Alvisi G;Samuel CE;Lohmann V;Kaderali L;Rohr K;Frese M;Stoecklin G;Bartenschlager R

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Virus infection-induced global protein synthesis suppression is linked to assembly of stress granules (SGs), cytosolic aggregates of stalled translation preinitiation complexes. To study long-term stress responses, we developed an imaging approach for extended observation and analysis of SG dynamics during persistent hepatitis C virus (HCV) infection. In combination with type 1 interferon, HCV infection induces highly dynamic assembly/disassembly of cytoplasmic SGs, concomitant with phases of active and stalled translation, delayed cell division, and prolonged cell survival. Double-stranded RNA (dsRNA), independent of viral replication, is sufficient to trigger these oscillations. Translation initiation factor eIF2α phosphorylation by protein kinase R mediates SG formation and translation arrest. This is antagonized by the upregulation of GADD34, the regulatory subunit of protein phosphatase 1 dephosphorylating eIF2α. Stress response oscillation is a general mechanism to prevent long-lasting translation repression and a conserved host cell reaction to multiple RNA viruses, which HCV may exploit to establish persistence.
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