Rab3a, a small GTP-binding protein, is required for the stabilization of the murine leukaemia virus Gag protein

Rab3a, a small GTP-binding protein, is required for the stabilization of the murine leukaemia virus Gag protein
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Rab3a 是一种小型 GTP 结合蛋白,是稳定鼠白血病病毒 Gag 蛋白所必需的

DOI:
10.1080/21541248.2021.1939631
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Kubo Yoshinao
Kubo Yoshinao
中科院分区:
--
文献类型:
--
作者:
Izumida Mai;Kakoki Katsura;Hayashi Hideki;Matsuyama Toshifumi;Kubo Yoshinao

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我们最近发现了一种与CD63相互作用的蛋白,以了解CD63在人类免疫缺陷病毒1型产生病毒粒子中的作用,我们发现Rab3a与CD63形成了一个复合体。在这项研究中,我们分析了Rab3a对逆转录病毒家族的另一成员小鼠白血病病毒(MLV)产生病毒粒子的影响。我们发现,Rab3a沉默诱导了MLV Gag蛋白的溶酶体降解,而Rab3a表达的恢复通过MLV Gag和Rab3a的复合形成恢复了Gag蛋白的水平,表明Rab3a是MLV Gag蛋白表达所必需的。相反,CD63沉默降低了释放的病毒粒子的感染力,但对病毒粒子的产生没有影响,表明CD63促进了释放的MLV粒子的感染性。虽然Rab3a诱导了未感染细胞中CD63的降解,但MLV Gag与Rab3a的复合体抑制了Rab3a介导的CD63在MLV感染细胞中的降解。最后,我们发现MLV Gag蛋白与Rab3a相互作用,稳定自己的蛋白和CD63,从而促进MLV释放颗粒的感染性。考虑到Rab3a参与了溶酶体向质膜的转运,它还可能诱导MLV Gag蛋白的细胞表面转运。
We recently identified a CD63-interacting protein to understand the role of CD63 in virion production of the human immunodeficiency virus type 1, and we have found that Rab3a forms a complex with CD63. In this study, we analysed the effect of Rab3a on virion production of the murine leukaemia virus (MLV), which is another member of the retrovirus family. We found that Rab3a silencing induced lysosomal degradation of the MLV Gag protein, and recovery of the Rab3a expression restored the level of the Gag protein through a complex formation of MLV Gag and Rab3a, indicating that Rab3a is required for MLV Gag protein expression. In contrast, CD63 silencing decreased the infectivity of released virions but had no effect on virion production, indicating that CD63 facilitates the infectivity of released MLV particles. Although Rab3a induced CD63 degradation in uninfected cells, the complex of MLV Gag and Rab3a suppressed the Rab3a-mediated CD63 degradation in MLV-infected cells. Finally, we found that the MLV Gag protein interacts with Rab3a to stabilize its own protein and CD63 that facilitates the infectivity of released MLV particles. Considering the involvement of Rab3a in lysosome trafficking to the plasma membrane, it may also induce cell surface transport of the MLV Gag protein.
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