Viral protein engagement of GBF1 induces host cell vulnerability through synthetic lethality.

Viral protein engagement of GBF1 induces host cell vulnerability through synthetic lethality.
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GBF1 的病毒蛋白参与通过合成致死作用诱导宿主细胞脆弱性。

DOI:
10.1101/2020.10.12.336487
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发表时间:
2020
期刊:
bioRxiv : the preprint server for biology
影响因子:
--
通讯作者:
Aitchison,JohnD
Aitchison,JohnD
中科院分区:
--
文献类型:
--
作者:
Navare,ArtiT;Mast,FredD;Olivier,JeanPaul;Bertomeu,Thierry;Neal,Maxwell;Carpp,LindsayN;Kaushansky,Alexis;Coulombe-Huntington,Jasmin;Tyers,Mike;Aitchison,JohnD

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病毒利用宿主蛋白来完成其生命周期。因此,重新利用的宿主蛋白的功能可能会受到损害;类似于功能丧失突变的情况。我们将此类宿主蛋白称为病毒诱导的亚型蛋白。带有癌症驱动功能丧失突变的细胞已成功地被药物干扰的蛋白质所靶向,这些蛋白质是由癌症特异性突变的合成致死(SL)伙伴编码的。同样,病毒诱导的亚型的 SL 相互作用也有可能成为基于宿主的抗病毒疗法。在这里,我们使用支持许多 RNA 病毒感染的 GBF1 作为概念验证。 GBF1 在与脊髓灰质炎病毒蛋白 3A 相互作用后变成亚型。对 GBF1 的 SL 伴侣的筛选显示 ARF1 是最热门的,破坏它会选择性地杀死单独合成 3A 或在脊髓灰质炎病毒复制子背景下合成 3A 的细胞。因此,病毒蛋白相互作用可以诱导亚型,使宿主细胞选择性地容易受到扰动,从而使未感染的细胞毫发无伤。利用病毒引起的脆弱性可能会产生针对包括 SARS-CoV-2 在内的许多病毒的广谱抗病毒药物。
Viruses co-opt host proteins to carry out their lifecycle. Repurposed host proteins may thus become functionally compromised; a situation analogous to a loss-of-function mutation. We term such host proteins as viral-induced hypomorphs. Cells bearing cancer driver loss-of-function mutations have successfully been targeted with drugs perturbing proteins encoded by the synthetic lethal (SL) partners of cancer-specific mutations. Similarly, SL interactions of viral-induced hypomorphs can potentially be targeted as host-based antiviral therapeutics. Here, we use GBF1, which supports the infection of many RNA viruses, as a proof-of-concept. GBF1 becomes a hypomorph upon interaction with the poliovirus protein 3A. Screening for SL partners of GBF1 revealed ARF1 as the top hit, disruption of which selectively killed cells that synthesize 3A alone or in the context of a poliovirus replicon. Thus, viral protein interactions can induce hypomorphs that render host cells selectively vulnerable to perturbations that leave uninfected cells otherwise unscathed. Exploiting viral-induced vulnerabilities could lead to broad-spectrum antivirals for many viruses, including SARS-CoV-2.
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