文章基本信息

标题：The Enzymatic Activity of APOBE3G Multimers
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作者：Yangang Pan ; Karen Zagorski ; Luda S. Shlyakhtenko 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：17953
DOI：10.1038/s41598-018-36372-6
语种：English
出版社：Springer Nature
摘要：APOBEC3G (A3G) belongs to the family of cytosine deaminases that play an important role in the innate immune response. Similar to other, two-domain members of the APOBEC family, A3G is prone to concentration-dependent oligomerization, which is an integral for its function in the cell. It is shown that oligomerization of A3G is related to the packing mechanism into virus particle and, is critical for the so-called roadblock model during reverse transcription of proviral ssDNA. The role of oligomerization for deaminase activity of A3G is widely discussed in the literature; however, its relevance to deaminase activity for different oligomeric forms of A3G remains unclear. Here, using Atomic Force Microscopy, we directly visualized A3G-ssDNA complexes, determined their yield and stoichiometry and in parallel, using PCR assay, measured the deaminase activity of these complexes. Our data demonstrate a direct correlation between the total yield of A3G-ssDNA complexes and their total deaminase activity. Using these data, we calculated the relative deaminase activity for each individual oligomeric state of A3G in the complex. Our results show not only similar deaminase activity for monomer, dimer and tetramer of A3G in the complex, but indicate that larger oligomers of A3G retain their deaminase activity.