Eukaryotic DNA polymerases require an iron-sulfur cluster for the formation of active complexes.

Eukaryotic DNA polymerases require an iron-sulfur cluster for the formation of active complexes.
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DOI:
10.1038/nchembio.721
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发表时间:
2011-11-27
影响因子:
14.8
通讯作者:
Pierik, Antonio J.
Pierik, Antonio J.
中科院分区:
生物学1区
文献类型:
--
作者:
Netz, Daili J. A.;Stith, Carrie M.;Stuempfig, Martin;Koepf, Gabriele;Vogel, Daniel;Genau, Heide M.;Stodola, Joseph L.;Lill, Roland;Burgers, Peter M. J.;Pierik, Antonio J.

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真核生物复制性DNA聚合酶(Pol α, δ和ε)和主要的DNA诱变酶Pol ζ在其催化亚基的c端结构域(CTD)中含有两个保守的富含半胱氨酸的金属结合基序(CysA和CysB)。在这里,我们通过体内和体外方法证明了在所有四种酵母b家族DNA聚合酶的CysB基序中存在必要的[4Fe-4S]簇。半胱氨酸配体突变导致Pol3中[4Fe-4S]辅因子的丢失,使CTD不稳定,并取消了与Pol31-Pol32亚基的相互作用。相反,附属亚基的过表达增加了与ctd结合的Fe-S簇的数量。这意味着Fe-S簇在聚合酶复合物稳定中具有重要的生理作用。此外,我们证明了锌结合的CysA基序是pcna介导的Pol δ加工性所必需的。总之,我们的研究结果表明,真核生物复制性DNA聚合酶的功能在很大程度上取决于辅助亚基招募和复制体稳定性的不同金属定位中心。
The eukaryotic replicative DNA polymerases (Pol α, δ, and ε), and the major DNA mutagenesis enzyme Pol ζ contain two conserved cysteine-rich metal-binding motifs (CysA and CysB) in the C-terminal domain (CTD) of their catalytic subunits. Here, we demonstrate by in vivo and in vitro approaches the presence of an essential [4Fe-4S] cluster in the CysB motif of all four yeast B-family DNA polymerases. Loss of the [4Fe-4S] cofactor by cysteine ligand mutagenesis in Pol3 destabilized the CTD and abrogated interaction with the Pol31-Pol32 subunits. Reciprocally, overexpression of accessory subunits increased the amount of CTD-bound Fe-S cluster. This implies an important physiological role of the Fe-S cluster in polymerase complex stabilization. Further, we demonstrate that the Zn-binding CysA motif is required for PCNA-mediated Pol δ processivity. Together, our findings show that the function of eukaryotic replicative DNA polymerases crucially depends on different metallocenters for accessory subunit recruitment and for replisome stability.
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