8UII image
Deposition Date 2023-10-10
Release Date 2024-05-29
Last Version Date 2025-05-14
Entry Detail
PDB ID:
8UII
Keywords:
MOTOR PROTEIN
Title:
Cryo-EM map of human clamp-clamp loader ATAD5-RFC-closed PCNA complex in intermediate state 1
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Insect cell expression vector pTIE1
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.04 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8UII validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:ATPase family AAA domain-containing protein 5
Gene (Uniprot):ATAD5
Chain IDs:A
Chain Length:1844
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q96QE3 Pfam ID:PF00004
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 2
Gene (Uniprot):RFC2
Chain IDs:B
Chain Length:354
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P35250 Pfam ID:PF00004, PF08542 EC:3.6.4.B8
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 5
Gene (Uniprot):RFC5
Chain IDs:C
Chain Length:340
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P40937 Pfam ID:PF00004, PF21960, PF08542 EC:3.6.4.B8
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 4
Gene (Uniprot):RFC4
Chain IDs:D
Chain Length:363
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P35249 Pfam ID:PF00004, PF21960, PF08542 EC:3.6.4.B8
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Replication factor C subunit 3
Gene (Uniprot):RFC3
Chain IDs:E
Chain Length:356
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P40938 Pfam ID:PF13177, PF21960, PF22534 EC:3.6.4.B8
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Proliferating cell nuclear antigen
Gene (Uniprot):PCNA
Chain IDs:F, G, H
Chain Length:261
Number of Molecules:3
Biological Source:Homo sapiens
UniProt ID:P12004 Pfam ID:PF00705, PF02747
Ligand Molecules
ADP
AGS
MG
Primary Citation
The human ATAD5 has evolved unique structural elements to function exclusively as a PCNA unloader.
Nat.Struct.Mol.Biol. 31 1680 1691 (2024)
PMID: 38871854 DOI: 10.1038/s41594-024-01332-4

Abstact

Humans have three different proliferating cell nuclear antigen (PCNA) clamp-loading complexes: RFC and CTF18-RFC load PCNA onto DNA, but ATAD5-RFC can only unload PCNA from DNA. The underlying structural basis of ATAD5-RFC unloading is unknown. We show here that ATAD5 has two unique locking loops that appear to tie the complex into a rigid structure, and together with a domain that plugs the DNA-binding chamber, prevent conformation changes required for DNA binding, likely explaining why ATAD5-RFC is exclusively a PCNA unloader. These features are conserved in the yeast PCNA unloader Elg1-RFC. We observe intermediates in which PCNA bound to ATAD5-RFC exists as a closed planar ring, a cracked spiral or a gapped spiral. Surprisingly, ATAD5-RFC can open a PCNA gap between PCNA protomers 2 and 3, different from the PCNA protomers 1 and 3 gap observed in all previously characterized clamp loaders.

Legend

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Disease

Primary Citation of related structures
8UII