艾滋病毒-1限制因子ADN脱氨酶域的结构 APOBEC3G
Kuan-Ming Chen1, Elena Harjes, Phillip J Gross
1Department of Biochemistry, Molecular Biology and Biophysics, [of Minnesota, Minneapolis, Minnesota 55455, USA.
Nature
|February 22, 2008
概括
人类APOBEC3G蛋白质是一种抗病毒酶,具有新确定的结构. 这种结构揭示了它如何结合DNA来抑制HIV-1等病毒.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 病毒学 病毒学
背景情况:
- APOBEC3G (阿波蛋白B信使-RNA编辑酶,催化多类3G) 是一种人类DNA脱氨酶,具有针对HIV-1等逆转录病毒的抗病毒特性.
- 它的抗病毒活性经常被病毒因素所克服,例如HIV-1 Vif,这导致APOBEC3G降解.
- APOBEC3G属于包括APOBEC1和AID在内的多核酸细胞氨酸脱氨酶家族,它们具有不同的生理作用.
研究的目的:
- 为了确定人类APOBEC3G催化域的溶液结构.
- 通过APOBEC3G阐明DNA结合和催化机制.
- 为APOBEC3G与HIV-1 Vif.等病毒蛋白的相互作用提供见解.
主要方法:
- 核磁共振 (NMR) 光谱法用于溶液结构的确定.
- 使用NMR进行DNA定位实验.
- 计算建模. 计算建模.
- 遗传学保护分析.
- 基于大肠杆菌的酶活性测定.
主要成果:
- 确定了APOBEC3G催化域的溶液结构,揭示了五个alpha-helices在一个五个β-strand疏水平台上的排列.
- 确定了两个alpha-helices作为形成协调活性位.
- 提出了一个DNA结合模型,表明在"边缘"位置上的正电荷残留物是催化的目标细胞因子.
- 结构和DNA结合模型得到了NMR,计算建模,遗传学数据和功能测试的支持.
结论:
- APOBEC3G催化域的确定的结构为其DNA除氨酶和抗病毒活动提供了分子基础.
- 拟议的DNA结合模型提供了关于APOBEC3G如何识别和与其DNA基质相互作用的见解.
- 了解APOBEC3G结构可以促进对相关家族成员的功能及其与病毒蛋白的相互作用的研究,这可能有助于开发抗病毒策略.
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