The archaeal ATPase PINA interacts with the helicase Hjm via its carboxyl terminal KH domain remodeling and processing replication fork and Holliday junction.

The archaeal ATPase PINA interacts with the helicase Hjm via its carboxyl terminal KH domain remodeling and processing replication fork and Holliday junction.
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古细菌 ATP 酶 PINA 通过其羧基末端 KH 结构域重塑和加工复制叉和霍利迪连接与解旋酶 Hjm 相互作用

DOI:
10.1093/nar/gky451
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发表时间:
2018-07-27
影响因子:
14.9
通讯作者:
Shen Y
Shen Y
中科院分区:
生物学2区
文献类型:
--
作者:
Zhai B;DuPrez K;Han X;Yuan Z;Ahmad S;Xu C;Gu L;Ni J;Fan L;Shen Y

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摘要 PINA是生命第三域古细菌中高度保守的新型ATP酶和DNA解旋酶。来自岛硫化叶菌 (SisPINA) 的 PINA 在晶体和溶液中形成六聚环。该蛋白能够促进霍利迪连接体 (HJ) 迁移,并在物理和功能上与 Hjc(HJ 特异性核酸内切酶)相互作用。在这里,我们证明 SisPINA 与 Hjm (Hel308a) 具有直接的物理相互作用,Hjm 是一种可能针对复制叉的解旋酶。体外生化分析表明,Hjm、Hjc 和 SisPINA 能够以一致的方式协调 HJ 迁移和裂解。羧基 13 个氨基酸残基的缺失损害了 SisPINA 和 Hjm 之间的相互作用。晶体结构分析表明,羧基 70 个氨基酸残基折叠成 II 型 KH 结构域,该结构域在其他蛋白质中具有结合 RNA 或 ssDNA 的功能。 KH结构域不仅介导PINA与Hjm和Hjc的相互作用,而且还调节PINA的六聚体组装。我们的结果总体表明 SisPINA、Hjm 和 Hjc 共同作用,在复制叉回归、HJ 形成和 HJ 裂解中发挥作用。
Abstract PINA is a novel ATPase and DNA helicase highly conserved in Archaea, the third domain of life. The PINA from Sulfolobus islandicus (SisPINA) forms a hexameric ring in crystal and solution. The protein is able to promote Holliday junction (HJ) migration and physically and functionally interacts with Hjc, the HJ specific endonuclease. Here, we show that SisPINA has direct physical interaction with Hjm (Hel308a), a helicase presumably targeting replication forks. In vitro biochemical analysis revealed that Hjm, Hjc, and SisPINA are able to coordinate HJ migration and cleavage in a concerted way. Deletion of the carboxyl 13 amino acid residues impaired the interaction between SisPINA and Hjm. Crystal structure analysis showed that the carboxyl 70 amino acid residues fold into a type II KH domain which, in other proteins, functions in binding RNA or ssDNA. The KH domain not only mediates the interactions of PINA with Hjm and Hjc but also regulates the hexameric assembly of PINA. Our results collectively suggest that SisPINA, Hjm and Hjc work together to function in replication fork regression, HJ formation and HJ cleavage.
DOI: 10.1016/j.dnarep.2011.10.009
发表时间: 2012-02-01
期刊: DNA REPAIR
影响因子: 3.8
作者:
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DOI: 10.1107/s0907444904019158
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发表时间: 2014-10-10
影响因子: 4.8
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DOI: 10.1111/j.1365-2443.2006.00925.x
发表时间: 2006-02-01
期刊: GENES TO CELLS
影响因子: 2.1
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