helical filament

Experimental Data Snapshot

  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report

This is version 2.2 of the entry. See complete history


High-resolution structure of the presynaptic RAD51 filament on single-stranded DNA by electron cryo-microscopy.

Short, J.M.Liu, Y.Chen, S.Soni, N.Madhusudhan, M.S.Shivji, M.K.Venkitaraman, A.R.

(2016) Nucleic Acids Res 44: 9017-9030

  • DOI: https://doi.org/10.1093/nar/gkw783
  • Primary Citation of Related Structures:  
    5JZC, 5NP7

  • PubMed Abstract: 

    Homologous DNA recombination (HR) by the RAD51 recombinase enables error-free DNA break repair. To execute HR, RAD51 first forms a presynaptic filament on single-stranded (ss) DNA, which catalyses pairing with homologous double-stranded (ds) DNA. Here, we report a structure for the presynaptic human RAD51 filament at 3.5-5.0Å resolution using electron cryo-microscopy. RAD51 encases ssDNA in a helical filament of 103Å pitch, comprising 6.4 protomers per turn, with a rise of 16.1Å and a twist of 56.2°. Inter-protomer distance correlates with rotation of an α-helical region in the core catalytic domain that is juxtaposed to ssDNA, suggesting how the RAD51-DNA interaction modulates protomer spacing and filament pitch. We map Fanconi anaemia-like disease-associated RAD51 mutations, clarifying potential phenotypes. We predict binding sites on the presynaptic filament for two modules present in each BRC repeat of the BRCA2 tumour suppressor, a critical HR mediator. Structural modelling suggests that changes in filament pitch mask or expose one binding site with filament-inhibitory potential, rationalizing the paradoxical ability of the BRC repeats to either stabilize or inhibit filament formation at different steps during HR. Collectively, our findings provide fresh insight into the structural mechanism of HR and its dysregulation in human disease.

  • Organizational Affiliation

    Medical Research Council Cancer Unit, University of Cambridge, Hills Road, Cambridge CB2 0XZ, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein RAD51 homolog 1
A, B, C, D, E
A, B, C, D, E, F, G
339Homo sapiensMutation(s): 0 
Gene Names: RAD51RAD51ARECA
UniProt & NIH Common Fund Data Resources
Find proteins for Q06609 (Homo sapiens)
Explore Q06609 
Go to UniProtKB:  Q06609
GTEx:  ENSG00000051180 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ06609
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-21
    Type: Initial release
  • Version 1.1: 2016-11-09
    Changes: Database references
  • Version 1.2: 2017-08-30
    Changes: Data collection
  • Version 2.0: 2018-10-17
    Changes: Atomic model, Data collection, Other, Refinement description
  • Version 2.1: 2019-12-11
    Changes: Other
  • Version 2.2: 2024-05-15
    Changes: Data collection, Database references