Reverse transcriptases prime DNA synthesis.

Reverse transcriptases prime DNA synthesis.
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DOI:
10.1093/nar/gkad478
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发表时间:
2023-08-11
影响因子:
14.9
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
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逆转录酶(rt)的发现挑战了遗传信息也可以从RNA流向DNA的中心教条。虽然它们作为DNA聚合酶,但它们与同样具有新生引物酶活性的复制酶有远亲关系。在这里,我们发现CRISPR相关的RTs (cart)直接在RNA和DNA上启动DNA合成。我们证明了一些CRISPR- cas复合物利用rt依赖性启动来合成新的间隔物并将其整合到CRISPR阵列中。扩展我们的分析,我们发现引物合成活性在其他主要RT类的代表中是保守的,包括II族内含子RT、端粒酶和逆转录病毒。总之,这些发现建立了一种保守的RTs先天能力来催化从头DNA引物合成,独立于辅助结构域或其他启动机制,这可能在各种生物途径中发挥重要作用。
The discovery of reverse transcriptases (RTs) challenged the central dogma by establishing that genetic information can also flow from RNA to DNA. Although they act as DNA polymerases, RTs are distantly related to replicases that also possess de novo primase activity. Here we identify that CRISPR associated RTs (CARTs) directly prime DNA synthesis on both RNA and DNA. We demonstrate that RT-dependent priming is utilized by some CRISPR-Cas complexes to synthesise new spacers and integrate these into CRISPR arrays. Expanding our analyses, we show that primer synthesis activity is conserved in representatives of other major RT classes, including group II intron RT, telomerase and retroviruses. Together, these findings establish a conserved innate ability of RTs to catalyse de novo DNA primer synthesis, independently of accessory domains or alternative priming mechanisms, which likely plays important roles in a wide variety of biological pathways.
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发表时间: 2003-02-03
期刊: BMC genomics
影响因子: 4.4
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