8FAZ

Cryo-EM structure of the human BCDX2 complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural insights into BCDX2 complex function in homologous recombination.

Rawal, Y.Jia, L.Meir, A.Zhou, S.Kaur, H.Ruben, E.A.Kwon, Y.Bernstein, K.A.Jasin, M.Taylor, A.B.Burma, S.Hromas, R.Mazin, A.V.Zhao, W.Zhou, D.Wasmuth, E.V.Greene, E.C.Sung, P.Olsen, S.K.

(2023) Nature 619: 640-649

  • DOI: https://doi.org/10.1038/s41586-023-06219-w
  • Primary Citation of Related Structures:  
    8FAZ, 8GBJ

  • PubMed Abstract: 

    Homologous recombination (HR) fulfils a pivotal role in the repair of DNA double-strand breaks and collapsed replication forks 1 . HR depends on the products of several paralogues of RAD51, including the tetrameric complex of RAD51B, RAD51C, RAD51D and XRCC2 (BCDX2) 2 . BCDX2 functions as a mediator of nucleoprotein filament assembly by RAD51 and single-stranded DNA (ssDNA) during HR, but its mechanism remains undefined. Here we report cryogenic electron microscopy reconstructions of human BCDX2 in apo and ssDNA-bound states. The structures reveal how the amino-terminal domains of RAD51B, RAD51C and RAD51D participate in inter-subunit interactions that underpin complex formation and ssDNA-binding specificity. Single-molecule DNA curtain analysis yields insights into how BCDX2 enhances RAD51-ssDNA nucleoprotein filament assembly. Moreover, our cryogenic electron microscopy and functional analyses explain how RAD51C alterations found in patients with cancer 3-6 inactivate DNA binding and the HR mediator activity of BCDX2. Our findings shed light on the role of BCDX2 in HR and provide a foundation for understanding how pathogenic alterations in BCDX2 impact genome repair.


  • Organizational Affiliation

    Department of Biochemistry & Structural Biology and Greehey Children's Cancer Research Institute, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein RAD51 homolog 2A [auth B]356Homo sapiensMutation(s): 0 
Gene Names: RAD51BRAD51L1REC2
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Find proteins for O15315 (Homo sapiens)
Explore O15315 
Go to UniProtKB:  O15315
PHAROS:  O15315
GTEx:  ENSG00000182185 
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UniProt GroupO15315
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein RAD51 homolog 3B [auth C]376Homo sapiensMutation(s): 0 
Gene Names: RAD51CRAD51L2
UniProt & NIH Common Fund Data Resources
Find proteins for O43502 (Homo sapiens)
Explore O43502 
Go to UniProtKB:  O43502
PHAROS:  O43502
GTEx:  ENSG00000108384 
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UniProt GroupO43502
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein RAD51 homolog 4C [auth D]328Homo sapiensMutation(s): 0 
Gene Names: RAD51DRAD51L3
UniProt & NIH Common Fund Data Resources
Find proteins for O75771 (Homo sapiens)
Explore O75771 
Go to UniProtKB:  O75771
PHAROS:  O75771
GTEx:  ENSG00000185379 
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UniProt GroupO75771
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein XRCC2D [auth X]288Homo sapiensMutation(s): 0 
Gene Names: XRCC2
UniProt & NIH Common Fund Data Resources
Find proteins for O43543 (Homo sapiens)
Explore O43543 
Go to UniProtKB:  O43543
PHAROS:  O43543
GTEx:  ENSG00000196584 
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UniProt GroupO43543
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM115568
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM128731
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR200030
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR01 CA168635
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR35 CA241801
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR180029
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR210023
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR00 GM140264
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR220068

Revision History  (Full details and data files)

  • Version 1.0: 2023-06-21
    Type: Initial release
  • Version 1.1: 2023-07-05
    Changes: Database references
  • Version 1.2: 2023-08-02
    Changes: Database references
  • Version 1.3: 2024-06-19
    Changes: Data collection