8C5Y image
Entry Detail
PDB ID:
8C5Y
EMDB ID:
Title:
RPA tetrameric supercomplex from Pyrococcus abyssi
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-01-10
Release Date:
2023-05-03
Method Details:
Experimental Method:
Resolution:
3.35 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Replication factor A
Chain IDs:A, D, G, J
Chain Length:177
Number of Molecules:4
Biological Source:Pyrococcus abyssi
Polymer Type:polypeptide(L)
Description:RPA32 subunit of the hetero-oligomeric complex involved in homologous recombination
Chain IDs:B, E, H, K
Chain Length:180
Number of Molecules:4
Biological Source:Pyrococcus abyssi
Polymer Type:polypeptide(L)
Description:RPA14 subunit of the hetero-oligomeric complex involved in homologous recombination
Chain IDs:C, F, I, L
Chain Length:112
Number of Molecules:4
Biological Source:Pyrococcus abyssi
Ligand Molecules
Primary Citation
DNA-binding mechanism and evolution of replication protein A.
Nat Commun 14 2326 2326 (2023)
PMID: 37087464 DOI: 10.1038/s41467-023-38048-w

Abstact

Replication Protein A (RPA) is a heterotrimeric single stranded DNA-binding protein with essential roles in DNA replication, recombination and repair. Little is known about the structure of RPA in Archaea, the third domain of life. By using an integrative structural, biochemical and biophysical approach, we extensively characterize RPA from Pyrococcus abyssi in the presence and absence of DNA. The obtained X-ray and cryo-EM structures reveal that the trimerization core and interactions promoting RPA clustering on ssDNA are shared between archaea and eukaryotes. However, we also identified a helical domain named AROD (Acidic Rpa1 OB-binding Domain), and showed that, in Archaea, RPA forms an unanticipated tetrameric supercomplex in the absence of DNA. The four RPA molecules clustered within the tetramer could efficiently coat and protect stretches of ssDNA created by the advancing replisome. Finally, our results provide insights into the evolution of this primordial replication factor in eukaryotes.

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Primary Citation of related structures