A euryarchaeal histone modulates strand displacement synthesis by replicative DNA polymerases

A euryarchaeal histone modulates strand displacement synthesis by replicative DNA polymerases
复制标题

广古菌组蛋白通过复制 DNA 聚合酶调节链置换合成

DOI:
10.1007/s11427-016-5076-8
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发表时间:
2016-06
影响因子:
9.1
通讯作者:
Huang, Li
Huang, Li
中科院分区:
生物学1区
文献类型:
--
作者:
Sun, Fei;Huang, Li

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广古菌门 (Euryarchaeota) 和泉古菌门 (Crenarchaeota) 是古细菌域的两个主要谱系,编码不同的染色质蛋白,并且在复制 DNA 聚合酶的使用方面存在差异。 Crenarchaea 拥有单家族 B DNA 聚合酶 (PolB),能够通过染色质蛋白 Cren7 和 Sul7d 调节链置换。广古菌有两种不同的复制 DNA 聚合酶:PolB 和 PolD(D 家族 DNA 聚合酶)。在这里,我们表征了来自超嗜热广古菌激烈热球菌的 PolB 和 PolD 的链置换活性,并研究了 HPfA1(来自 P 的真核组蛋白同源物)的影响。对这些活动感到愤怒。我们证明 PolB 和 PolD 在链置换方面都是有效的。 HPfA1 抑制两种 DNA 聚合酶的 DNA 链置换,但对退火至单链模板 DNA 的 RNA 链的置换几乎没有影响。这与 HPfA1 与双链 DNA 的结合比与 RNA:DNA 杂交体的结合更紧密的发现是一致的。我们的结果表明,尽管crenarchaea和广古菌在染色体包装方面有所不同,但它们在滞后链DNA合成过程中通过DNA聚合酶调节链位移方面具有相似的机制。
Euryarchaeota and Crenarchaeota, the two main lineages of the domain Archaea, encode different chromatin proteins and differ in the use of replicative DNA polymerases. Crenarchaea possess a single family B DNA polymerase (PolB), which is capable of strand displacement modulated by the chromatin proteins Cren7 and Sul7d. Euryarchaea have two distinct replicative DNA polymerases, PolB and PolD, a family D DNA polymerase. Here we characterized the strand displacement activities of PolB and PolD from the hyperthermophilic euryarchaeonPyrococcus furiosusand investigated the influence of HPfA1, a homolog of eukaryotic histones fromP. furiosus, on these activities. We showed that both PolB and PolD were efficient in strand displacement. HPfA1 inhibited DNA strand displacement by both DNA polymerases but exhibited little effect on the displacement of a RNA strand annealed to single-stranded template DNA. This is consistent with the finding that HPfA1 bound more tightly to double-stranded DNA than to a RNA:DNA hybrid. Our results suggest that, although crenarchaea and euryarchaea differ in chromosomal packaging, they share similar mechanisms in modulating strand displacement by DNA polymerases during lagging strand DNA synthesis.
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