Crystal structure of HSF2BP-ALPHA1 tetramer

Experimental Data Snapshot

  • Resolution: 1.48 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report

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BRCA2-HSF2BP oligomeric ring disassembly by BRME1 promotes homologous recombination.

Ghouil, R.Miron, S.Sato, K.Ristic, D.van Rossum-Fikkert, S.E.Legrand, P.Ouldali, M.Winter, J.M.Ropars, V.David, G.Arteni, A.A.Wyman, C.Knipscheer, P.Kanaar, R.Zelensky, A.N.Zinn-Justin, S.

(2023) Sci Adv 9: eadi7352-eadi7352

  • DOI: https://doi.org/10.1126/sciadv.adi7352
  • Primary Citation of Related Structures:  
    8A50, 8A51

  • PubMed Abstract: 

    In meiotic homologous recombination (HR), BRCA2 facilitates loading of the recombinases RAD51 and DMC1 at the sites of double-strand breaks (DSBs). The HSF2BP-BRME1 complex interacts with BRCA2. Its absence causes a severe reduction in recombinase loading at meiotic DSB. We previously showed that, in somatic cancer cells ectopically producing HSF2BP, DNA damage can trigger HSF2BP-dependent degradation of BRCA2, which prevents HR. Here, we report that, upon binding to BRCA2, HSF2BP forms octameric rings that are able to interlock into a large ring-shaped 24-nucleotide oligomer. Addition of BRME1 leads to dissociation of both of these ring structures and cancels the disruptive effect of HSF2BP on cancer cell resistance to DNA damage. It also prevents BRCA2 degradation during interstrand DNA crosslink repair in Xenopus egg extracts. We propose that, during meiosis, the control of HSF2BP-BRCA2 oligomerization by BRME1 ensures timely assembly of the ring complex that concentrates BRCA2 and controls its turnover, thus promoting HR.

  • Organizational Affiliation

    Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock factor 2-binding protein
A, B
32synthetic constructMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O75031 (Homo sapiens)
Explore O75031 
Go to UniProtKB:  O75031
PHAROS:  O75031
GTEx:  ENSG00000160207 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75031
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.48 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.81α = 90
b = 79.81β = 90
c = 79.81γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
autoPROCdata processing
STARANISOdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)France--

Revision History  (Full details and data files)

  • Version 1.0: 2023-07-05
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Database references