Sulfolobus Replication Factor C Stimulates the Activity of DNA Polymerase B1

Sulfolobus Replication Factor C Stimulates the Activity of DNA Polymerase B1
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硫化叶菌复制因子 C 刺激 DNA 聚合酶 B1 的活性

DOI:
10.1128/jb.01552-14
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发表时间:
2014-04
影响因子:
3.2
通讯作者:
Huang, Li
Huang, Li
中科院分区:
生物学3区
文献类型:
--
作者:
Zhang, Likui;Guo, Li;She, Qunxin;Huang, Li

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摘要复制因子C(RFC)在真核生物和古生物复制过程中,能将增殖细胞核抗原(增殖细胞核抗原)装载到DNA上,使增殖细胞核抗原与DNA聚合酶结合,从而促进DNA合成。在这份报告中,我们证明了来自Sulfolobus属高温古生菌的RFC复合体与DNA聚合酶B1(PolB1)物理上相互作用,并以不依赖于ATP的方式增强PolB1的聚合酶和3‘-5’外核酸酶的活性。RFC对PolB1活性的刺激与RFC结合DNA的能力无关,但与RFC通过蛋白质-蛋白质相互作用促进PolB1与DNA结合的能力是一致的。这些结果表明,在DNA复制过程中,Sulfolobus RFC可能在招募DNA聚合酶以进行有效的引物延伸方面发挥作用。
ABSTRACT Replication factor C (RFC) is known to function in loading proliferating cell nuclear antigen (PCNA) onto primed DNA, allowing PCNA to tether DNA polymerase for highly processive DNA synthesis in eukaryotic and archaeal replication. In this report, we show that an RFC complex from the hyperthermophilic archaea of the genus Sulfolobus physically interacts with DNA polymerase B1 (PolB1) and enhances both the polymerase and 3′-5′ exonuclease activities of PolB1 in an ATP-independent manner. Stimulation of the PolB1 activity by RFC is independent of the ability of RFC to bind DNA but is consistent with the ability of RFC to facilitate DNA binding by PolB1 through protein-protein interaction. These results suggest that Sulfolobus RFC may play a role in recruiting DNA polymerase for efficient primer extension, in addition to clamp loading, during DNA replication.
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