5XRZ image
Entry Detail
PDB ID:
5XRZ
Keywords:
Title:
Structure of a ssDNA bound to the inner DNA binding site of RAD52
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2017-06-11
Release Date:
2018-04-25
Method Details:
Experimental Method:
Resolution:
3.60 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DNA repair protein RAD52 homolog
Mutations:K102A, K133A
Chain IDs:A, B, C, D, E, F, G, H, I, J, K
Chain Length:215
Number of Molecules:11
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:ssDNA (40-MER)
Chain IDs:L
Chain Length:40
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
Structural Basis of Homology-Directed DNA Repair Mediated by RAD52
iScience 3 50 62 (2018)
PMID: 30428330 DOI: 10.1016/j.isci.2018.04.005

Abstact

RAD52 mediates homologous recombination by annealing cDNA strands. However, the detailed mechanism of DNA annealing promoted by RAD52 has remained elusive. Here we report two crystal structures of human RAD52 single-stranded DNA (ssDNA) complexes that probably represent key reaction intermediates of RAD52-mediated DNA annealing. The first structure revealed a "wrapped" conformation of ssDNA around the homo-oligomeric RAD52 ring, in which the edges of the bases involved in base pairing are exposed to the solvent. The ssDNA conformation is close to B-form and appears capable of engaging in Watson-Crick base pairing with the cDNA strand. The second structure revealed a "trapped" conformation of ssDNA between two RAD52 rings. This conformation is stabilized by a different RAD52 DNA binding site, which promotes the accumulation of multiple RAD52 rings on ssDNA and the aggregation of ssDNA. These structures provide a structural framework for understanding the mechanism of RAD52-mediated DNA annealing.

Legend

Protein

Chemical

Disease

Primary Citation of related structures