标题:Dissection of the functional domains of an archaeal Holliday junction helicase
作者:Hong, Ye; Chu, Mingzhu; Li, Yansheng; Ni, Jinfeng; Sheng, Duohong; Hou, Guihua; She, Qunxin; Shen, Yulong
作者机构:[Hong, Ye; Chu, Mingzhu; Li, Yansheng; Ni, Jinfeng; Sheng, Duohong; Shen, Yulong] Shandong Univ, State Key Lab Microbial Technol, Jinan 250100, People 更多
通讯作者:Shen, YL
通讯作者地址:[Shen, YL]Shandong Univ, State Key Lab Microbial Technol, 27 Shanda Nan Rd, Jinan 250100, Peoples R China.
来源:DNA REPAIR
出版年:2012
卷:11
期:2
页码:102-111
DOI:10.1016/j.dnarep.2011.10.009
关键词:Archaea; Helicase; Holliday junction; Endonuclease; Sulfolobus tokodaii;; Stalled replication fork
摘要:Helicases and nucleases form complexes that play very important roles in DNA repair pathways some of which interact with each other at Holliday junctions. In this study, we present in vitro and in vivo analysis of Hjm and its interaction with Hjc in Sulfolobus. In vitro studies employed Hjm from the hyperthermophilic archaeon Sulfolobus tokodaii (StoHjm) and its truncated derivatives, and characterization of the StoHjm proteins revealed that the N-terminal module (residues 1-431) alone was capable of ATP hydrolysis and DNA binding, while the C-terminal one (residues 415-704) was responsible for regulating the helicase activity. The region involved in StoHjm-StoHjc (Hjc from S. tokodaii) interaction was identified as part of domain II, domain III (Winged Helix motif), and domain IV (residues 366-645) for StoHjm. We present evidence supporting that StoHjc regulates the helicase activity of StoHjm by inducing conformation change of the enzyme. Furthermore, StoHjm is able to prevent the formation of Hjc/HJ high complex, suggesting a regulation mechanism of Hjm to the activity of Hjc. We show that Hjm is essential for cell viability using recently developed genetic system and mutant propagation assay, suggesting that Hjm/Hjc mediated resolution of stalled replication forks is of crucial importance in archaea. A tentative pathway with which Hjm/Hjc interaction could have occurred at stalled replication forks is discussed. (C) 2011 Elsevier B.V. All rights reserved.
收录类别:SCOPUS;SCIE
WOS核心被引频次:10
Scopus被引频次:10
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855826963&doi=10.1016%2fj.dnarep.2011.10.009&partnerID=40&md5=0aecf5c9d7f48436b16f5a98ca88f639
TOP