6GHD

Structural analysis of the ternary complex between lamin A/C, BAF and emerin identifies an interface disrupted in autosomal recessive progeroid diseases

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural analysis of the ternary complex between lamin A/C, BAF and emerin identifies an interface disrupted in autosomal recessive progeroid diseases.

Samson, C., Petitalot, A., Celli, F., Herrada, I., Ropars, V., Le Du, M.H., Nhiri, N., Jacquet, E., Arteni, A.A., Buendia, B., Zinn-Justin, S.

(2018) Nucleic Acids Res 46: 10460-10473

  • DOI: 10.1093/nar/gky736
  • Primary Citation of Related Structures:  
    6GHD

  • PubMed Abstract: 

    • Lamins are the main components of the nucleoskeleton. Whereas their 3D organization was recently described using cryoelectron tomography, no structural data highlights how they interact with their partners at the interface between the inner nuclear envelope and chromatin ...

    Lamins are the main components of the nucleoskeleton. Whereas their 3D organization was recently described using cryoelectron tomography, no structural data highlights how they interact with their partners at the interface between the inner nuclear envelope and chromatin. A large number of mutations causing rare genetic disorders called laminopathies were identified in the C-terminal globular Igfold domain of lamins A and C. We here present a first structural description of the interaction between the lamin A/C immunoglobulin-like domain and emerin, a nuclear envelope protein. We reveal that this lamin A/C domain both directly binds self-assembled emerin and interacts with monomeric emerin LEM domain through the dimeric chromatin-associated Barrier-to-Autointegration Factor (BAF) protein. Mutations causing autosomal recessive progeroid syndromes specifically impair proper binding of lamin A/C domain to BAF, thus destabilizing the link between lamin A/C and BAF in cells. Recent data revealed that, during nuclear assembly, BAF's ability to bridge distant DNA sites is essential for guiding membranes to form a single nucleus around the mitotic chromosome ensemble. Our results suggest that BAF interaction with lamin A/C also plays an essential role, and that mutations associated with progeroid syndromes leads to a dysregulation of BAF-mediated chromatin organization and gene expression.

    Organizational Affiliation: 

    Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EmerinA [auth G],
H		45Homo sapiensMutation(s): 0 
Gene Names: EMD, EDMD, STA
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Find proteins for P50402 (Homo sapiens)
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Go to UniProtKB:  P50402
PHAROS:  P50402
GTEx:  ENSG00000102119 
Entity Groups  
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UniProt GroupP50402
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Barrier-to-autointegration factorE [auth A],
F [auth C],
B [auth D],
D [auth E]		88Homo sapiensMutation(s): 4 
Gene Names: BANF1, BAF, BCRG1
UniProt & NIH Common Fund Data Resources
Find proteins for O75531 (Homo sapiens)
Explore O75531 
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PHAROS:  O75531
GTEx:  ENSG00000175334 
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UniProt GroupO75531
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Prelamin-A/CC [auth B],
G [auth F]		119Homo sapiensMutation(s): 0 
Gene Names: LMNA, LMN1
UniProt & NIH Common Fund Data Resources
Find proteins for P02545 (Homo sapiens)
Explore P02545 
Go to UniProtKB:  P02545
PHAROS:  P02545
GTEx:  ENSG00000160789 
Entity Groups  
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UniProt GroupP02545
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.77α = 66.44
b = 62.75β = 66.55
c = 64.34γ = 88.05
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
Cootmodel building
MOLREPphasing
APEXdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-08
    Type: Initial release
  • Version 1.1: 2018-08-29
    Changes: Data collection, Database references
  • Version 1.2: 2018-11-14
    Changes: Data collection, Database references