The architecture of a eukaryotic replisome
Abstract
At the eukaryotic DNA replication fork, it is widely believed that the Cdc45–Mcm2–7–GINS (CMG) helicase is positioned in front to unwind DNA and that DNA polymerases trail behind the helicase. Here we used single-particle EM to directly image a Saccharomyces cerevisiae replisome. Contrary to expectations, the leading strand Pol ε is positioned ahead of CMG helicase, whereas Ctf4 and the lagging-strand polymerase (Pol) α–primase are behind the helicase. This unexpected architecture indicates that the leading-strand DNA travels a long distance before reaching Pol ε, first threading through the Mcm2–7 ring and then making a U-turn at the bottom and reaching Pol ε at the top of CMG. Lastly, our work reveals an unexpected configuration of the eukaryotic replisome, suggests possible reasons for this architecture and provides a basis for further structural and biochemical replisome studies.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
- Rockefeller Univ., New York, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1257963
- Report Number(s):
- BNL-112308-2016-JA
Journal ID: ISSN 1545-9993
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Structural & Molecular Biology
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 12; Journal ID: ISSN 1545-9993
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Sun, Jingchuan, Yuan, Zuanning, Shi, Yi, Georgescu, Roxana E., Chait, Brian T., Li, Huilin, and O'Donnell, Michael E. The architecture of a eukaryotic replisome. United States: N. p., 2015.
Web. doi:10.1038/nsmb.3113.
Sun, Jingchuan, Yuan, Zuanning, Shi, Yi, Georgescu, Roxana E., Chait, Brian T., Li, Huilin, & O'Donnell, Michael E. The architecture of a eukaryotic replisome. United States. https://doi.org/10.1038/nsmb.3113
Sun, Jingchuan, Yuan, Zuanning, Shi, Yi, Georgescu, Roxana E., Chait, Brian T., Li, Huilin, and O'Donnell, Michael E. Mon .
"The architecture of a eukaryotic replisome". United States. https://doi.org/10.1038/nsmb.3113. https://www.osti.gov/servlets/purl/1257963.
@article{osti_1257963,
title = {The architecture of a eukaryotic replisome},
author = {Sun, Jingchuan and Yuan, Zuanning and Shi, Yi and Georgescu, Roxana E. and Chait, Brian T. and Li, Huilin and O'Donnell, Michael E.},
abstractNote = {At the eukaryotic DNA replication fork, it is widely believed that the Cdc45–Mcm2–7–GINS (CMG) helicase is positioned in front to unwind DNA and that DNA polymerases trail behind the helicase. Here we used single-particle EM to directly image a Saccharomyces cerevisiae replisome. Contrary to expectations, the leading strand Pol ε is positioned ahead of CMG helicase, whereas Ctf4 and the lagging-strand polymerase (Pol) α–primase are behind the helicase. This unexpected architecture indicates that the leading-strand DNA travels a long distance before reaching Pol ε, first threading through the Mcm2–7 ring and then making a U-turn at the bottom and reaching Pol ε at the top of CMG. Lastly, our work reveals an unexpected configuration of the eukaryotic replisome, suggests possible reasons for this architecture and provides a basis for further structural and biochemical replisome studies.},
doi = {10.1038/nsmb.3113},
journal = {Nature Structural & Molecular Biology},
number = 12,
volume = 22,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2015},
month = {Mon Nov 02 00:00:00 EST 2015}
}
Web of Science
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- Proceedings of the National Academy of Sciences, Vol. 114, Issue 16