8GJ8 image
Entry Detail
PDB ID:
8GJ8
Title:
RAD51C C-terminal domain
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-03-15
Release Date:
2023-08-16
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:RAD51C
Chain IDs:A
Chain Length:288
Number of Molecules:1
Biological Source:Alvinella pompejana
Primary Citation
RAD51C-XRCC3 structure and cancer patient mutations define DNA replication roles.
Nat Commun 14 4445 4445 (2023)
PMID: 37488098 DOI: 10.1038/s41467-023-40096-1

Abstact

RAD51C is an enigmatic predisposition gene for breast, ovarian, and prostate cancer. Currently, missing structural and related functional understanding limits patient mutation interpretation to homology-directed repair (HDR) function analysis. Here we report the RAD51C-XRCC3 (CX3) X-ray co-crystal structure with bound ATP analog and define separable RAD51C replication stability roles informed by its three-dimensional structure, assembly, and unappreciated polymerization motif. Mapping of cancer patient mutations as a functional guide confirms ATP-binding matching RAD51 recombinase, yet highlights distinct CX3 interfaces. Analyses of CRISPR/Cas9-edited human cells with RAD51C mutations combined with single-molecule, single-cell and biophysics measurements uncover discrete CX3 regions for DNA replication fork protection, restart and reversal, accomplished by separable functions in DNA binding and implied 5' RAD51 filament capping. Collective findings establish CX3 as a cancer-relevant replication stress response complex, show how HDR-proficient variants could contribute to tumor development, and identify regions to aid functional testing and classification of cancer mutations.

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