Biological Assembly 1  

 3D View: Structure

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 7-mer - A7 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 259.06 kDa 
• Atom Count: 11935 
• Residue Count: 2184 
• Unique protein chains: 1

5JZC

helical filament

• DOI: 10.2210/pdb5JZC/pdb
• EMDataResource: EMD-8183

• Classification: DNA BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


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

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Experimental Data Snapshot

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

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

• PubMed: 27596592 
• DOI: 10.1093/nar/gkw783
• Primary Citation of Related Structures:  
  5NP7, 5JZC


• 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.

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Organizational Affiliation: 

Medical Research Council Cancer Unit, University of Cambridge, Hills Road, Cambridge CB2 0XZ, UK [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA repair protein RAD51 homolog 1	A, B, C, D, E, F, G	339	Homo sapiens	Mutation(s): 0  Gene Names: RAD51, RAD51A, RECA
Find proteins for Q06609 (Homo sapiens) Explore Q06609  Go to UniProtKB:  Q06609
NIH Common Fund Data Resources
PHAROS  Q06609 GTEx  ENSG00000051180

Experimental Data & Validation

Experimental Data

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

Structure Validation

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
  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