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:  
    6TNF, 6TNG, 6TNI

  • 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
FANCD2A1,439Gallus gallusMutation(s): 0 
Gene Names: FANCD2
UniProt
Find proteins for F1NP22 (Gallus gallus)
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Go to UniProtKB:  F1NP22
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UniProt GroupF1NP22
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Fanconi anemia complementation group IB1,338Gallus gallusMutation(s): 0 
Gene Names: FANCI
UniProt
Find proteins for B0I564 (Gallus gallus)
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Go to UniProtKB:  B0I564
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UniProt GroupB0I564
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Polyubiquitin-CC76Homo sapiensMutation(s): 0 
Gene Names: UBC
UniProt & NIH Common Fund Data Resources
Find proteins for P0CG48 (Homo sapiens)
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PHAROS:  P0CG48
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UniProt GroupP0CG48
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (33-MER)D, E33synthetic construct
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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  (Full details and data files)

  • 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