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-Structure paper
タイトル | The architecture of a eukaryotic replisome. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 22, Issue 12, Page 976-982, Year 2015 |
掲載日 | 2015年11月2日 |
著者 | Jingchuan Sun / Yi Shi / Roxana E Georgescu / Zuanning Yuan / Brian T Chait / Huilin Li / Michael E O'Donnell / |
PubMed 要旨 | 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 ...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 ɛ 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 ɛ, first threading through the Mcm2-7 ring and then making a U-turn at the bottom and reaching Pol ɛ at the top of CMG. 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. |
リンク | Nat Struct Mol Biol / PubMed:26524492 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 16.0 - 18.0 Å |
構造データ | EMDB-6463: EMDB-6465: |
由来 |
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