7E8I

Structural insight into BRCA1-BARD1 complex recruitment to damaged chromatin

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural insight into BRCA1-BARD1 complex recruitment to damaged chromatin.

Dai, L., Dai, Y., Han, J., Huang, Y., Wang, L., Huang, J., Zhou, Z.

(2021) Mol Cell 81: 2765-2777.e6

  • DOI: 10.1016/j.molcel.2021.05.010
  • Primary Citation of Related Structures:  
    7E8I

  • PubMed Abstract: 

    • The BRCA1-BARD1 complex directs the DNA double-strand break (DSB) repair pathway choice to error-free homologous recombination (HR) during the S-G2 stages. Targeting BRCA1-BARD1 to DSB-proximal sites requires BARD1-mediated nucleosome interaction and histone mark recognition ...

    The BRCA1-BARD1 complex directs the DNA double-strand break (DSB) repair pathway choice to error-free homologous recombination (HR) during the S-G2 stages. Targeting BRCA1-BARD1 to DSB-proximal sites requires BARD1-mediated nucleosome interaction and histone mark recognition. Here, we report the cryo-EM structure of BARD1 bound to a ubiquitinated nucleosome core particle (NCP Ub ) at 3.1 Å resolution and illustrate how BARD1 simultaneously recognizes the DNA damage-induced mark H2AK15ub and DNA replication-associated mark H4K20me0 on the nucleosome. In vitro and in vivo analyses reveal that the BARD1-NCP Ub complex is stabilized by BARD1-nucleosome interaction, BARD1-ubiquitin interaction, and BARD1 ARD domain-BARD1 BRCT domain interaction, and abrogating these interactions is detrimental to HR activity. We further identify multiple disease-causing BARD1 mutations that disrupt BARD1-NCP Ub interactions and hence impair HR. Together, this study elucidates the mechanism of BRCA1-BARD1 complex recruitment and retention by DSB-flanking nucleosomes and sheds important light on cancer therapeutic avenues.

    Organizational Affiliation: 

    National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: zhouzh@ibp.ac.cn.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3C [auth A],
G [auth E]		135Xenopus laevisMutation(s): 0 
Gene Names: XELAEV_18002543mg
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Find proteins for P84233 (Xenopus laevis)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4D [auth B],
H [auth F]		102Xenopus laevisMutation(s): 0 
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Find proteins for P62799 (Xenopus laevis)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2AE [auth C],
I [auth G]		129Xenopus laevisMutation(s): 1 
Gene Names: h2ac14.L, h2ac14, hist1h2aj, LOC494591, XELAEV_18003602mg
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Find proteins for P06897 (Xenopus laevis)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B 1.1F [auth D],
J [auth H]		122Xenopus laevisMutation(s): 1 
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Find proteins for P02281 (Xenopus laevis)
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
BRCA1-associated RING domain protein 1K356Homo sapiensMutation(s): 0 
Gene Names: BARD1
EC: 2.3.2.27
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Find proteins for Q99728 (Homo sapiens)
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PHAROS:  Q99728
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Polyubiquitin-BL86Homo sapiensMutation(s): 1 
Gene Names: UBB
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Entity ID: 1
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DNA (145-MER)A [auth J]145Homo sapiens
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Entity ID: 2
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DNA (145-MER)B [auth I]145Homo sapiens
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31671344
National Natural Science Foundation of China (NSFC)China31871318
National Natural Science Foundation of China (NSFC)China31970621
National Natural Science Foundation of China (NSFC)China31801070
National Natural Science Foundation of China (NSFC)China31730021
National Natural Science Foundation of China (NSFC)China31971220
National Natural Science Foundation of China (NSFC)China3170040161
National Natural Science Foundation of China (NSFC)China31961160725

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-30
    Type: Initial release
  • Version 1.1: 2021-07-14
    Changes: Database references