HIV-1 Gag Binds the Multi-Aminoacyl-tRNA Synthetase Complex via the EPRS Subunit.

HIV-1 Gag Binds the Multi-Aminoacyl-tRNA Synthetase Complex via the EPRS Subunit.
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DOI:
10.3390/v15020474
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发表时间:
2023-02-08
期刊:
Viruses
影响因子:
--
通讯作者:
Musier-Forsyth K
Musier-Forsyth K
中科院分区:
其他
文献类型:
--
作者:
Jin D;Zhu Y;Schubert HL;Goff SP;Musier-Forsyth K

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宿主因子tRNA有助于逆转录病毒的复制,如人类免疫缺陷病毒1型(HIV-1)。HIV-1以人tRNALys3为反转录引物,HIV-1结构蛋白GAG在质膜(PM)的组装受基质(MA)结构域-tRNA相互作用的调节。胞质中存在一个大的、动态的多氨基酰-tRNA合成酶复合体(MSC),它由8个氨基酰-tRNA合成酶(ARS)和其他3种细胞蛋白组成。鉴定HIV-宿主相互作用的蛋白质组学研究已经确定MSC是HIV-1 Gag和MA相互作用的一部分。在这里,我们证实了HIV-1 Gag的MA结构域与MSC形成了稳定的复合体,并将主要相互作用位点映射到双功能人谷氨酰-Pro-tRNA合成酶(EPRS)的连接域,并表明MA-EPRS的相互作用是RNA依赖的。显著降低Eprs相互作用的MA突变降低了病毒的感染性,并被定位到也与磷脂酰肌醇-(4,5)-二磷酸相互作用的MA残基。Eprs或Eprs片段的过度表达并不影响对HIV-1感染的易感性,而Eprs的敲除减少了对照报告基因和HIV-1蛋白的翻译。EPRs基因敲除导致子代病毒粒子产量下降,但不能归因于对病毒基因表达的选择性作用,病毒粒子的特异性感染性保持不变。虽然GAG-EPRS相互作用的确切功能仍不确定,但我们讨论了这种相互作用对病毒或宿主活动的可能影响。
Host factor tRNAs facilitate the replication of retroviruses such as human immunodeficiency virus type 1 (HIV-1). HIV-1 uses human tRNALys3 as the primer for reverse transcription, and the assembly of HIV-1 structural protein Gag at the plasma membrane (PM) is regulated by matrix (MA) domain–tRNA interactions. A large, dynamic multi-aminoacyl-tRNA synthetase complex (MSC) exists in the cytosol and consists of eight aminoacyl-tRNA synthetases (ARSs) and three other cellular proteins. Proteomic studies to identify HIV–host interactions have identified the MSC as part of the HIV-1 Gag and MA interactomes. Here, we confirmed that the MA domain of HIV-1 Gag forms a stable complex with the MSC, mapped the primary interaction site to the linker domain of bi-functional human glutamyl-prolyl-tRNA synthetase (EPRS), and showed that the MA–EPRS interaction was RNA dependent. MA mutations that significantly reduced the EPRS interaction reduced viral infectivity and mapped to MA residues that also interact with phosphatidylinositol-(4,5)-bisphosphate. Overexpression of EPRS or EPRS fragments did not affect susceptibility to HIV-1 infection, and knockdown of EPRS reduced both a control reporter gene and HIV-1 protein translation. EPRS knockdown resulted in decreased progeny virion production, but the decrease could not be attributed to selective effects on virus gene expression, and the specific infectivity of the virions remained unchanged. While the precise function of the Gag–EPRS interaction remains uncertain, we discuss possible effects of the interaction on either virus or host activities.
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