6TNF

Structure of monoubiquitinated FANCD2 in complex with FANCI and DNA

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.2 of the entry. See complete history. 


Literature

FANCD2-FANCI is a clamp stabilized on DNA by monoubiquitination of FANCD2 during DNA repair.

Alcon, P., Shakeel, S., Chen, Z.A., Rappsilber, J., Patel, K.J., Passmore, L.A.

(2020) Nat Struct Mol Biol 27: 240-248

  • DOI: 10.1038/s41594-020-0380-1
  • Primary Citation of Related Structures:  
    6TNI, 6TNG, 6TNF

  • PubMed Abstract: 

    • Vertebrate DNA crosslink repair excises toxic replication-blocking DNA crosslinks. Numerous factors involved in crosslink repair have been identified, and mutations in their corresponding genes cause Fanconi anemia (FA). A key step in crosslink repair is monoubiquitination of the FANCD2-FANCI heterodimer, which then recruits nucleases to remove the DNA lesion ...

    Vertebrate DNA crosslink repair excises toxic replication-blocking DNA crosslinks. Numerous factors involved in crosslink repair have been identified, and mutations in their corresponding genes cause Fanconi anemia (FA). A key step in crosslink repair is monoubiquitination of the FANCD2-FANCI heterodimer, which then recruits nucleases to remove the DNA lesion. Here, we use cryo-EM to determine the structures of recombinant chicken FANCD2 and FANCI complexes. FANCD2-FANCI adopts a closed conformation when the FANCD2 subunit is monoubiquitinated, creating a channel that encloses double-stranded DNA (dsDNA). Ubiquitin is positioned at the interface of FANCD2 and FANCI, where it acts as a covalent molecular pin to trap the complex on DNA. In contrast, isolated FANCD2 is a homodimer that is unable to bind DNA, suggestive of an autoinhibitory mechanism that prevents premature activation. Together, our work suggests that FANCD2-FANCI is a clamp that is locked onto DNA by ubiquitin, with distinct interfaces that may recruit other DNA repair factors.

    Organizational Affiliation: 

    MRC Laboratory of Molecular Biology, Cambridge, UK. passmore@mrc-lmb.cam.ac.uk.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FANCD2A1439Gallus gallusMutation(s): 0 
Gene Names: FANCD2
Find proteins for F1NP22 (Gallus gallus)
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Go to UniProtKB:  F1NP22
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Fanconi anemia complementation group IB1338Gallus gallusMutation(s): 0 
Gene Names: FANCI
Find proteins for B0I564 (Gallus gallus)
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Go to UniProtKB:  B0I564
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Polyubiquitin-CC76Homo sapiensMutation(s): 0 
Gene Names: UBC
Find proteins for P0CG48 (Homo sapiens)
Explore P0CG48 
Go to UniProtKB:  P0CG48
NIH Common Fund Data Resources
PHAROS  P0CG48
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (33-MER)D, E33synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)United KingdomMC_U105192715
European Molecular Biology Organization (EMBO)United KingdomALTF 692-2018

Revision History 

  • Version 1.0: 2020-02-19
    Type: Initial release
  • Version 1.1: 2020-02-26
    Changes: Database references
  • Version 1.2: 2020-03-18
    Changes: Database references