ALIX is recruited temporarily into HIV-1 budding sites at the end of gag assembly.

ALIX is recruited temporarily into HIV-1 budding sites at the end of gag assembly.
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DOI:
10.1371/journal.pone.0096950
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Saffarian S
Saffarian S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ku PI;Bendjennat M;Ballew J;Landesman MB;Saffarian S

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Gag 在质膜内层的聚合驱动人类免疫缺陷病毒 1 (HIV-1) 的组装。 Gag 招募运输 (ESCRT) 所需的内体分选复合物的成分,以促进膜裂变和病毒粒子释放。 ESCRT 组装是通过招募 ALIX 和 TSG101/ESCRT-I 启动的,它们直接与病毒 Gag 蛋白结合,然后招募下游 ESCRT-III 和 VPS4 因子来完成出芽过程。与之前的模型相比,我们发现 ALIX 在 Gag 组装结束时被短暂地招募,并且大多数 ALIX 分子在病毒出芽时被回收到胞质溶胶中,尽管有一部分仍保留在病毒颗粒内。我们的实验表明,ALIX 被招募到组装病毒粒子的颈部,并且在病毒粒子释放后大部分被回收。
Polymerization of Gag on the inner leaflet of the plasma membrane drives the assembly of Human Immunodeficiency Virus 1 (HIV-1). Gag recruits components of the endosomal sorting complexes required for transport (ESCRT) to facilitate membrane fission and virion release. ESCRT assembly is initiated by recruitment of ALIX and TSG101/ESCRT-I, which bind directly to the viral Gag protein and then recruit the downstream ESCRT-III and VPS4 factors to complete the budding process. In contrast to previous models, we show that ALIX is recruited transiently at the end of Gag assembly, and that most ALIX molecules are recycled into the cytosol as the virus buds, although a subset remains within the virion. Our experiments imply that ALIX is recruited to the neck of the assembling virion and is mostly recycled after virion release.
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