Induction of APOBEC3 family proteins, a defensive maneuver underlying interferon-induced anti-HIV-1 activity.

Induction of APOBEC3 family proteins, a defensive maneuver underlying interferon-induced anti-HIV-1 activity.
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DOI:
10.1084/jem.20051512
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发表时间:
2006-01-23
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wahl SM
Wahl SM
中科院分区:
其他
文献类型:
--
作者:
Peng G;Lei KJ;Jin W;Greenwell-Wild T;Wahl SM

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载脂蛋白 B mRNA 编辑酶催化多肽样 3G (APOBEC3G) 是一种胞苷脱氨酶,是最近公认的一种先天细胞内蛋白,对人类免疫缺陷病毒 (HIV) 具有致命活性。 APOBEC3G 酶活性被包装到子代病毒颗粒中,导致 HIV DNA 降解。作为反击,HIV 病毒粒子感染因子 (Vif) 以 APOBEC3G 为目标进行蛋白酶体蛋白水解,将其从出芽病毒粒子中排除。基于 APOBEC3G 拮抗 HIV 感染的能力,人们对阐明其调节机制产生了极大的兴趣。在这项研究中,我们提供了第一个证据,证明先天的内源性宿主防御因子有可能促进 APOBEC3G 并阻止病毒介导的控制其细胞宿主的尝试。我们确定干扰素 (IFN)-α 是 APOBEC3G 的有效诱导剂,可以克服 HIV Vif 对 APOBEC3 蛋白的中和作用,从而对巨噬细胞 HIV 有效复制构成威胁。我们的数据提供了 IFN-α 介导其抗病毒活性的新维度,并提出了一种使宿主不允许病毒复制的方法。
Apolipoprotein B mRNA-editing enzyme-catalytic polypeptide-like 3G (APOBEC3G), a cytidine deaminase, is a recently recognized innate intracellular protein with lethal activity against human immunodeficiency virus (HIV). Packaged into progeny virions, APOBEC3G enzymatic activity leads to HIV DNA degradation. As a counterattack, HIV virion infectivity factor (Vif) targets APOBEC3G for proteasomal proteolysis to exclude it from budding virions. Based on the ability of APOBEC3G to antagonize HIV infection, considerable interest hinges on elucidating its mechanism(s) of regulation. In this study, we provide the first evidence that an innate, endogenous host defense factor has the potential to promote APOBEC3G and rebuke the virus-mediated attempt to control its cellular host. We identify interferon (IFN)-α as a potent inducer of APOBEC3G to override HIV Vif neutralization of APOBEC3 proteins that pose a threat to efficient macrophage HIV replication. Our data provide a new dimension by which IFN-α mediates its antiviral activity and suggest a means to render the host nonpermissive for viral replication.
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