8TW9 image
Deposition Date 2023-08-20
Release Date 2024-09-04
Last Version Date 2024-10-09
Entry Detail
PDB ID:
8TW9
Keywords:
DNA BINDING PROTEIN/DNA
Title:
Cryo-EM structure of S. cerevisiae PolE-Ctf18-8-1-DNA
Biological Source:
Source Organism:
Saccharomyces cerevisiae (Taxon ID: 4932)
synthetic construct (Taxon ID: 32630)
Host Organism:
Saccharomyces cerevisiae
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8TW9 validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Sister chromatid cohesion protein DCC1
Gene (Uniprot):DCC1
Chain IDs:F (auth: B)
Chain Length:380
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P25559 Pfam ID:PF09724
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Chromosome transmission fidelity protein 18
Gene (Uniprot):CTF18
Chain IDs:A (auth: C)
Chain Length:26
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P49956
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Chromosome transmission fidelity protein 8
Gene (Uniprot):CTF8
Chain IDs:E (auth: D)
Chain Length:132
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P38877 Pfam ID:PF09696
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA polymerase epsilon catalytic subunit A
Gene (Uniprot):POL2
Chain IDs:D (auth: E)
Chain Length:2222
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P21951 Pfam ID:PF03104, PF22634, PF08490, PF22912
Polymer Type:polydeoxyribonucleotide
Molecule:Primer DNA
Chain IDs:B (auth: P)
Chain Length:9
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Molecule:Template DNA
Chain IDs:C (auth: T)
Chain Length:15
Number of Molecules:1
Biological Source:synthetic construct
Ligand Molecules
SF4
Primary Citation
Mechanism of PCNA loading by Ctf18-RFC for leading-strand DNA synthesis.
Science 385 eadk5901 eadk5901 (2024)
PMID: 39088616 DOI: 10.1126/science.adk5901

Abstact

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.

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Primary Citation of related structures
8TW9
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