5JZC

helical filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.2 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

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: 10.1093/nar/gkw783
  • Primary Citation of Related Structures:  

  • 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. Her ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA repair protein RAD51 homolog 1
A, B, C, D, E, F, G
339Homo sapiensMutation(s): 0 
Gene Names: RAD51 (RAD51A, RECA)
Find proteins for Q06609 (Homo sapiens)
Go to Gene View: RAD51
Go to UniProtKB:  Q06609
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.2 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-05-16 
  • Released Date: 2016-09-21 
  • Deposition Author(s): Short, J., Liu, Y.

Revision History 

  • Version 1.0: 2016-09-21
    Type: Initial release
  • Version 1.1: 2016-11-09
    Type: Database references
  • Version 1.2: 2017-08-30
    Type: Data collection
  • Version 2.0: 2018-10-17
    Type: Atomic model, Data collection, Other, Refinement description