NMR structure of human restriction factor APOBEC3A reveals substrate binding and enzyme specificity.

NMR structure of human restriction factor APOBEC3A reveals substrate binding and enzyme specificity.
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DOI:
10.1038/ncomms2883
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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人APOBEC3A(A3A)是一种单链DNA(ssDNA)胞苷脱氨酶,可限制病毒病原体和内源性逆转录转座子,并在先天免疫应答中发挥作用。此外,它作为基因组DNA突变体的潜力对致癌作用有影响。对A3A的脱氨酶和核酸结合特性的更深入理解,这是其生物活性的核心,由于缺乏结构信息而受到限制。在这里,我们报告A3A的NMR溶液结构,并表明与ssDNA底物相互作用的关键界面包括延伸超出催化中心的残基。重要的是,通过真实的实时监测脱氨酶活性,我们发现A3 A对A3 A特异性TTCA或A3 G特异性CCCA底物显示出相似的催化活性,涉及紧邻反应性C的5′端的关键决定簇。我们的研究结果提供了新的机制的见解A3A介导的脱氨基,并提供进一步的分子研究的结构基础。
Human APOBEC3A (A3A) is a single-stranded DNA (ssDNA) cytidine deaminase that restricts viral pathogens and endogenous retrotransposons and plays a role in the innate immune response. Furthermore, its potential to act as a genomic DNA mutator has implications for a role in carcinogenesis. A deeper understanding of A3A’s deaminase and nucleic acid binding properties, which is central to its biological activities, has been limited by the lack of structural information. Here, we report the NMR solution structure of A3A and show that the critical interface for interaction with ssDNA substrates includes residues extending beyond the catalytic center. Importantly, by monitoring deaminase activity in real time, we find that A3A displays similar catalytic activity on A3A-specific TTCA- or A3G-specific CCCA-containing substrates, involving key determinants immediately 5′ of the reactive C. Our results afford novel mechanistic insights into A3A-mediated deamination and provide the structural basis for further molecular studies.
DOI: 10.1074/jbc.m706436200
发表时间: 2008-02-01
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