8THB image
Deposition Date 2023-07-14
Release Date 2024-05-22
Last Version Date 2025-05-21
Entry Detail
PDB ID:
8THB
Keywords:
REPLICATION
Title:
Structure of the Saccharomyces cerevisiae PCNA clamp unloader Elg1-RFC complex
Biological Source:
Source Organism:
Saccharomyces cerevisiae (Taxon ID: 4932)
Host Organism:
Saccharomyces cerevisiae
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.20 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8THB validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:ELG1 isoform 1
Chain IDs:A
Chain Length:791
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:Q12050
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 4
Gene (Uniprot):RFC4
Chain IDs:B
Chain Length:323
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P40339 Pfam ID:PF00004, PF08542
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 3
Gene (Uniprot):RFC3
Chain IDs:C
Chain Length:336
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P38629 Pfam ID:PF00004, PF08542
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 2
Gene (Uniprot):RFC2
Chain IDs:D
Chain Length:353
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P40348 Pfam ID:PF00004, PF21960, PF08542
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 5
Gene (Uniprot):RFC5
Chain IDs:E
Chain Length:354
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
UniProt ID:P38251 Pfam ID:PF13177, PF21960, PF22534
Ligand Molecules
ADP
AGS
MG
Primary Citation
Structure of the PCNA unloader Elg1-RFC.
Sci Adv 10 eadl1739 eadl1739 (2024)
PMID: 38427736 DOI: 10.1126/sciadv.adl1739

Abstact

During DNA replication, the proliferating cell nuclear antigen (PCNA) clamps are loaded onto primed sites for each Okazaki fragment synthesis by the AAA+ heteropentamer replication factor C (RFC). PCNA encircling duplex DNA is quite stable and is removed from DNA by the dedicated clamp unloader Elg1-RFC. Here, we show the cryo-EM structure of Elg1-RFC in various states with PCNA. The structures reveal essential features of Elg1-RFC that explain how it is dedicated to PCNA unloading. Specifically, Elg1 contains two external loops that block opening of the Elg1-RFC complex for DNA binding, and an "Elg1 plug" domain that fills the central DNA binding chamber, thereby reinforcing the exclusive PCNA unloading activity of Elg1-RFC. Elg1-RFC was capable of unloading PCNA using non-hydrolyzable AMP-PNP. Both RFC and Elg1-RFC could remove PCNA from covalently closed circular DNA, indicating that PCNA unloading occurs by a mechanism that is distinct from PCNA loading. Implications for the PCNA unloading mechanism are discussed.

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Primary Citation of related structures
8THB