Cooperation of the N-terminal helicase and C-terminal endonuclease activities of archaeal Hef protein in processing stalled replication forks

被引:67
作者
Komori, K
Hidaka, M
Horiuchi, T
Fujikane, R
Shinagawa, H
Ishino, Y
机构
[1] Kyushu Univ, Fac Agr, Dept Genet Resources Technol, Higashi Ku, Fukuoka 8128581, Japan
[2] Biomol Engn Res Inst, Dept Mol Biol, Osaka 5650874, Japan
[3] Natl Inst Basic Biol, Okazaki, Aichi 4448585, Japan
[4] Osaka Univ, Microbial Dis Res Inst, Dept Mol Microbiol, Osaka 5650871, Japan
关键词
D O I
10.1074/jbc.M409243200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Blockage of replication fork progression often occurs during DNA replication, and repairing and restarting stalled replication forks are essential events in all organisms for the maintenance of genome integrity. The repair system employs processing enzymes to restore the stalled fork. In Archaea Hef is a well conserved protein that specifically cleaves nicked, flapped, and fork-structured DNAs. This enzyme contains two distinct domains that are similar to the DEAH helicase family and XPF nuclease superfamily proteins. Analyses of truncated mutant proteins consisting of each domain revealed that the C-terminal nuclease domain independently recognized and incised fork-structured DNA. The N-terminal helicase domain also specifically unwound fork-structured DNA and Holliday junction DNA in the presence of ATP. Moreover, the endonuclease activity of the whole Hef protein was clearly stimulated by ATP hydrolysis catalyzed by the N-terminal domain. These enzymatic properties suggest that Hef efficiently resolves stalled replication forks by two steps, which are branch point transfer to the 5'-end of the nascent lagging strand by the N-terminal helicase followed by template strand incision for leading strand synthesis by the C-terminal endonuclease.
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收藏
页码:53175 / 53185
页数:11
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