Alternative divalent cations (Zn²⁺, Co²⁺, and Mn²⁺) are not mutagenic at conditions optimal for HIV-1 reverse transcriptase activity.
Alternative divalent cations (Zn²⁺, Co²⁺, and Mn²⁺) are not mutagenic at conditions optimal for HIV-1 reverse transcriptase activity.
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DOI：
10.1186/s12858-015-0041-x
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发表时间：
2015-05-03
期刊：
影响因子：
--
通讯作者：
DeStefano JJ
中科院分区：
文献类型：
--
作者：
Achuthan V;DeStefano JJ
Fidelity of DNA polymerases can be influenced by cation co-factors. Physiologically, Mg2+ is used as a co-factor by HIV reverse transcriptase (RT) to perform catalysis; however, alternative cations including Mn2+, Co2+, and Zn2+ can also support catalysis. Although Zn2+ supports DNA synthesis, it inhibits HIV RT by significantly modifying RT catalysis. Zn2+ is currently being investigated as a component of novel treatment options against HIV and we wanted to investigate the fidelity of RT with Zn2+. We used PCR-based and plasmid-based alpha complementation assays as well as steady-state misinsertion and misincorporation assays to examine the fidelity of RT with Mn2+, Co2+, and Zn2+. The fidelity of DNA synthesis by HIV-1 RT was approximately 2.5 fold greater in Zn2+ when compared to Mg2+ at cation conditions optimized for nucleotide catalysis. Consistent with this, RT extended primers with mismatched 3′ nucleotides poorly and inserted incorrect nucleotides less efficiently using Zn2+ than Mg2+. In agreement with previous literature, we observed that Mn2+ and Co2+ dramatically decreased the fidelity of RT at highly elevated concentrations (6 mM). However, surprisingly, the fidelity of HIV RT with Mn2+ and Co2+ remained similar to Mg2+ at lower concentrations that are optimal for catalysis. This study shows that Zn2+, at optimal extension conditions, increases the fidelity of HIV-1 RT and challenges the notion that alternative cations capable of supporting polymerase catalysis are inherently mutagenic.
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