Cyclin L2 is a critical HIV dependency factor in macrophages that controls SAMHD1 abundance.

Cyclin L2 is a critical HIV dependency factor in macrophages that controls SAMHD1 abundance.
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DOI:
10.1016/j.chom.2014.11.009
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发表时间:
2015-01-14
影响因子:
30.3
通讯作者:
Ratner L
Ratner L
中科院分区:
医学1区
文献类型:
--
作者:
Kyei GB;Cheng X;Ramani R;Ratner L

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限制因子SAMHD1限制HIV-1在非循环细胞中的复制。SIV和HIV-2通过辅助蛋白Vpx克服了这一限制,Vpx通过与宿主泛素连接酶适配器DCAF1相互作用,靶向SAMHD1降解。然而,尽管存在限制因子SAMHD1,但HIV-1在巨噬细胞中复制所用的因子尚不清楚。通过酵母2杂交筛选,我们发现Cyclin L2是巨噬细胞中HIV-1复制所需的dcaf1相互作用蛋白。Cyclin L2的敲低导致巨噬细胞中HIV-1复制的严重衰减,而不是循环细胞,并且在没有SAMHD1的情况下这种作用消失。细胞周期蛋白L2和SAMHD1形成一个部分依赖于DCAF1存在的分子复合物,并以蛋白酶体和DCAF1依赖的方式导致SAMHD1降解。因此,细胞周期蛋白l2介导的巨噬细胞中SAMHD1水平的控制支持HIV-1复制。
The restriction factor SAMHD1 limits HIV-1 replication in non-cycling cells. SIV and HIV-2 overcome this restriction via the accessory protein Vpx, which targets SAMHD1 for degradation through interactions with the host ubiquitin ligase adaptor, DCAF1. However, the factors used by HIV-1 to replicate in macrophages, despite the presence of the restriction factor SAMHD1, are unknown. Using a yeast 2-hybrid screen, we identified Cyclin L2 as a DCAF1-interacting protein required for HIV-1 replication in macrophages. Knockdown of Cyclin L2 results in severe attenuation of HIV-1 replication in macrophages, but not cycling cells, and this effect is lost in the absence of SAMHD1. Cyclin L2 and SAMHD1 form a molecular complex that is partially dependent on the presence of DCAF1 and results in SAMHD1 degradation in a proteasome- and DCAF1-dependent manner. Thus, Cyclin L2-mediated control of SAMHD1 levels in macrophages supports HIV-1 replication.
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