7Z21

BAF A12T bound to the lamin A/C Ig-fold domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The BAF A12T mutation disrupts lamin A/C interaction, impairing robust repair of nuclear envelope ruptures in Nestor-Guillermo progeria syndrome cells.

Janssen, A.Marcelot, A.Breusegem, S.Legrand, P.Zinn-Justin, S.Larrieu, D.

(2022) Nucleic Acids Res 50: 9260-9278

  • DOI: https://doi.org/10.1093/nar/gkac726
  • Primary Citation of Related Structures:  
    7Z21

  • PubMed Abstract: 

    Nestor-Guillermo progeria syndrome (NGPS) is caused by a homozygous alanine-to-threonine mutation at position 12 (A12T) in barrier-to-autointegration factor (BAF). It is characterized by accelerated aging with severe skeletal abnormalities. BAF is an essential protein binding to DNA and nuclear envelope (NE) proteins, involved in NE rupture repair. Here, we assessed the impact of BAF A12T on NE integrity using NGPS-derived patient fibroblasts. We observed a strong defect in lamin A/C accumulation to NE ruptures in NGPS cells, restored upon homozygous reversion of the pathogenic BAF A12T mutation with CRISPR/Cas9. By combining in vitro and cellular assays, we demonstrated that while the A12T mutation does not affect BAF 3D structure and phosphorylation by VRK1, it specifically decreases the interaction between BAF and lamin A/C. Finally, we revealed that the disrupted interaction does not prevent repair of NE ruptures but instead generates weak points in the NE that lead to a higher frequency of NE re-rupturing in NGPS cells. We propose that this NE fragility could directly contribute to the premature aging phenotype in patients.


  • Organizational Affiliation

    Department of Clinical Biochemistry, Cambridge Biomedical Campus, Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Barrier-to-autointegration factor, N-terminally processed
A, B, C, D
89Homo sapiensMutation(s): 1 
Gene Names: BANF1BAFBCRG1
UniProt & NIH Common Fund Data Resources
Find proteins for O75531 (Homo sapiens)
Explore O75531 
Go to UniProtKB:  O75531
PHAROS:  O75531
GTEx:  ENSG00000175334 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75531
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Lamin-A/C
E, F
156Homo sapiensMutation(s): 0 
Gene Names: LMNALMN1
UniProt & NIH Common Fund Data Resources
Find proteins for P02545 (Homo sapiens)
Explore P02545 
Go to UniProtKB:  P02545
PHAROS:  P02545
GTEx:  ENSG00000160789 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02545
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.11α = 90
b = 75.073β = 114.19
c = 65.034γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
autoPROCdata processing
STARANISOdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)FranceANR- 10-INSB-05-01
H2020 Marie Curie Actions of the European CommissionEuropean Union871037

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-24
    Type: Initial release
  • Version 1.1: 2022-09-14
    Changes: Database references
  • Version 1.2: 2022-11-23
    Changes: Database references
  • Version 1.3: 2024-01-31
    Changes: Data collection, Refinement description