Evolutionarily conserved and non-conserved retrovirus restriction activities of artiodactyl APOBEC3F proteins.

Evolutionarily conserved and non-conserved retrovirus restriction activities of artiodactyl APOBEC3F proteins.
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DOI:
10.1093/nar/gkl721
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发表时间:
2006
影响因子:
14.9
通讯作者:
Harris, Reuben S.
Harris, Reuben S.
中科院分区:
生物学2区
文献类型:
--
作者:
Jonsson, Stefan R.;Hache, Guylaine;Stenglein, Mark D.;Fahrenkrug, Scott C.;Andresdottir, Valgerdur;Harris, Reuben S.

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APOBEC3蛋白是哺乳动物特有的。许多通过cDNA胞嘧啶脱氨机制抑制逆转录病毒感染。HIV-1通过Vif中和这种宿主防御,Vif触发APOBEC3泛素化和降解。在这里,我们报告了一个APOBEC3F样,双脱氨酶结构域蛋白从三个偶蹄类:牛,猪和羊。与其人类对应物APOBEC3F和APOBEC3G一样,偶蹄动物APOBEC3F蛋白是DNA胞嘧啶脱氨酶,主要位于胞质溶胶中,可以抑制HIV-1和MLV的复制。逆转录病毒限制归因于脱氨酶依赖性和非依赖性机制,因为脱氨酶缺陷突变体保留显著的抗逆转录病毒活性。然而,与人APOBEC3F和APOBEC3G不同,偶蹄动物APOBEC3F蛋白具有活性N-末端DNA胞嘧啶脱氨酶结构域,这引起更广泛的二核苷酸脱氨偏好,并且它们对HIV-1 Vif具有抗性。这些数据表明,DNA胞嘧啶脱氨基,亚细胞定位和逆转录病毒的限制活性是保守的哺乳动物,而活性位点的位置,当地的突变偏好和Vif易感性。总之,这些研究表明,哺乳动物特异性的,APOBEC3依赖的逆转录酶限制系统的一些属性是必要的和保守的,但其他同时模块化和高度适应性。
The APOBEC3 proteins are unique to mammals. Many inhibit retrovirus infection through a cDNA cytosine deamination mechanism. HIV-1 neutralizes this host defense through Vif, which triggers APOBEC3 ubiquitination and degradation. Here, we report an APOBEC3F-like, double deaminase domain protein from three artiodactyls: cattle, pigs and sheep. Like their human counterparts, APOBEC3F and APOBEC3G, the artiodactyl APOBEC3F proteins are DNA cytosine deaminases that locate predominantly to the cytosol and can inhibit the replication of HIV-1 and MLV. Retrovirus restriction is attributable to deaminase-dependent and -independent mechanisms, as deaminase-defective mutants retain significant anti-retroviral activity. However, unlike human APOBEC3F and APOBEC3G, the artiodactyl APOBEC3F proteins have an active N-terminal DNA cytosine deaminase domain, which elicits a broader dinucleotide deamination preference, and they are resistant to HIV-1 Vif. These data indicate that DNA cytosine deamination; sub-cellular localization and retrovirus restriction activities are conserved in mammals, whereas active site location, local mutational preferences and Vif susceptibility are not. Together, these studies indicate that some properties of the mammal-specific, APOBEC3-dependent retroelement restriction system are necessary and conserved, but others are simultaneously modular and highly adaptable.
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