Template-dependent polymerization across discontinuous templates by the heterodimeric primase from the hyperthermophilic archaeon Sulfolobus solfataricus.

Template-dependent polymerization across discontinuous templates by the heterodimeric primase from the hyperthermophilic archaeon Sulfolobus solfataricus.
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来自超嗜热古细菌硫磺菌的异二聚体引物酶在不连续模板上进行模板依赖性聚合。

DOI:
10.1093/nar/gkr1256
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发表时间:
2012-04
影响因子:
14.9
通讯作者:
Huang L
Huang L
中科院分区:
生物学2区
文献类型:
--
作者:
Hu J;Guo L;Wu K;Liu B;Lang S;Huang L

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来自极端嗜热古菌硫磺硫化叶菌(Sulfolobus solfataricus,SsoPriSL)的真核样引发酶表现出一系列活性,包括使用rNTPs或dNTPs的模板依赖性从头引物合成、引物延伸和模板非依赖性末端核苷酸转移。值得注意的是,这种酶能够在体外合成比模板长得多的产物。在这里,我们表明,长产物是由SsoPriSL跨不连续模板(PADT)的模板依赖性聚合产生的。PADT通过引物合成或末端转移启动,并有效地发生在含有连续DC的模板上。当在一个模板上合成的生长链的3′-末端直接退火到另一个模板上或在末端添加核苷酸后退火到另一个模板上,随后在新模板上延伸时,发生模板转换。PADT的关键是SsoPriSL促进链退火的能力。SsoPriSL以dNTPs或rNTPs作为底物催化PADT,但优选后者。当温度从55°C升高到70°C时,该酶在PADT中保持活性,但在体外引物合成中变得低效。我们的研究结果表明,SsoPriSL是能够桥接非互补的DNA末端,因此,可能会在双链DNA断裂修复中发挥作用,在pneumea。
The eukaryotic-like primase from the hyperthermophilic archaeon Sulfolobus solfataricus (SsoPriSL) exhibits a range of activities including template-dependent de novo primer synthesis, primer extension and template-independent terminal nucleotidyl transfer using either rNTPs or dNTPs. Remarkably, the enzyme is able to synthesize products far longer than templates in vitro. Here we show that the long products resulted from template-dependent polymerization across discontinuous templates (PADT) by SsoPriSL. PADT was initiated through either primer synthesis or terminal transfer, and occurred efficiently on templates containing contiguous dCs. Template switching took place when the 3′-end of a growing strand synthesized on one template annealed to another template directly or following the terminal addition of nucleotides, and was subsequently extended on the new template. The key to PADT was the ability of SsoPriSL to promote strand annealing. SsoPriSL catalyzed PADT with either dNTPs or rNTPs as the substrates but preferred the latter. The enzyme remained active in PADT but became inefficient in primer synthesis in vitro when temperature was raised from 55°C to 70°C. Our results suggest that SsoPriSL is capable of bridging noncomplementary DNA ends and, therefore, may serve a role in double-strand DNA break repair in Archaea.
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期刊: SCIENCE
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