+検索条件
-Structure paper
タイトル | Mechanism of PCNA loading by Ctf18-RFC for leading-strand DNA synthesis. |
---|---|
ジャーナル・号・ページ | Science, Vol. 385, Issue 6708, Page eadk5901, Year 2024 |
掲載日 | 2024年8月2日 |
著者 | Zuanning Yuan / Roxana Georgescu / Nina Y Yao / Olga Yurieva / Michael E O'Donnell / Huilin Li / |
PubMed 要旨 | The proliferating cell nuclear antigen (PCNA) clamp encircles DNA to hold DNA polymerases (Pols) to DNA for processivity. The Ctf18-RFC PCNA loader, a replication factor C (RFC) variant, is specific ...The proliferating cell nuclear antigen (PCNA) clamp encircles DNA to hold DNA polymerases (Pols) to DNA for processivity. The Ctf18-RFC PCNA loader, a replication factor C (RFC) variant, is specific to the leading-strand Pol (Polε). We reveal here the underlying mechanism of Ctf18-RFC specificity to Polε using cryo-electron microscopy and biochemical studies. We found that both Ctf18-RFC and Polε contain specific structural features that direct PCNA loading onto DNA. Unlike other clamp loaders, Ctf18-RFC has a disordered ATPase associated with a diverse cellular activities (AAA+) motor that requires Polε to bind and stabilize it for efficient PCNA loading. In addition, Ctf18-RFC can pry prebound Polε off of DNA, then load PCNA onto DNA and transfer the PCNA-DNA back to Polε. These elements in both Ctf18-RFC and Polε provide specificity in loading PCNA onto DNA for Polε. |
リンク | Science / PubMed:39088616 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.2 - 4.1 Å |
構造データ | EMDB-41661: Cryo-EM structure of S. cerevisiae Ctf18-RFC-PCNA complex in Apo state conformation I EMDB-41662: Cryo-EM structure of S. cerevisiae Ctf18-RFC-PCNA complex in Apo state conformation I EMDB-41663: Cryo-EM structure of S. cerevisiae PolE-Ctf18-8-1-DNA EMDB-41664: Cryo-EM structure of S. cerevisiae Ctf18-RFC-PCNA-PolE-DNA complex EMDB-41665: Cryo-EM structure of S. cerevisiae Ctf18-RFC-PCNA-DNA complex EMDB-44356, PDB-9b8r: |
化合物 | ChemComp-SF4: |
由来 |
|
キーワード | DNA BINDING PROTEIN/DNA / Pol2 / DNA / REPLICATION / DNA BINDING PROTEIN-DNA complex |