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
中科院分区:
文献类型:
--
作者:
Kyei GB;Cheng X;Ramani R;Ratner L
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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