Structure of the Vif-binding domain of the antiviral enzyme APOBEC3G.

Structure of the Vif-binding domain of the antiviral enzyme APOBEC3G.
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DOI:
10.1038/nsmb.3033
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发表时间:
2015-06
影响因子:
16.8
通讯作者:
Matsuo, Hiroshi
Matsuo, Hiroshi
中科院分区:
生物学1区
文献类型:
--
作者:
Kouno, Takahide;Luengas, Elizabeth M.;Shigematsu, Megumi;Shandilya, Shivender M. D.;Zhang, JingYing;Chen, Luan;Hara, Mayuko;Schiffer, Celia A.;Harris, Reuben S.;Matsuo, Hiroshi

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人APOBEC 3G(A3 G)DNA胞嘧啶脱氨酶限制和超突变基于DNA的寄生虫,包括HIV-1。病毒感染因子(Vif)通过触发A3 G降解来防止限制。虽然A3 G催化结构域的结构是已知的,但N-末端Vif结合结构域的结构已被证明更难以捉摸。在这里,进化和结构引导的诱变被用来溶解的VIF结合域的A3 G允许通过NMR光谱的结构测定。一个较小的锌配位口袋和改变螺旋包装区分它从催化域结构,并帮助解释报告的无活性的这个域。这种可溶性A3 G N-末端结构域与Vif结合,这使得诱变和生物化学实验能够鉴定由α1-β1、β2-α2和β4-α4环形成的独特Vif相互作用表面。这种结构为Vif-A3 G相互作用提供了新的线索,并为未来的药物开发提供了关键信息。
The human APOBEC3G (A3G) DNA cytosine deaminase restricts and hypermutates DNA-based parasites including HIV-1. The viral infectivity factor (Vif) prevents restriction by triggering A3G degradation. While the structure of the A3G catalytic domain is known, the structure of the N-terminal Vif-binding domain has proven more elusive. Here, evolution- and structure-guided mutagenesis was used to solubilize the Vif-binding domain of A3G permitting structural determination by NMR spectroscopy. A smaller zinc-coordinating pocket and altered helical packing distinguish it from catalytic domain structures, and help explain the reported inactivity of this domain. This soluble A3G N-terminal domain is bound by Vif, which enabled mutagenesis and biochemical experiments to identify a unique Vif-interacting surface formed by α1-β1, β2-α2, and β4-α4 loops. This structure sheds new light on the Vif-A3G interaction and provides critical information for future drug development.
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