6SNZ

Crystal structure of lamin A coil1b tetramer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.254 

Starting Model: other
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This is version 1.3 of the entry. See complete history


Literature

Lateral A11type tetramerization in lamins.

Lilina, A.V.Chernyatina, A.A.Guzenko, D.Strelkov, S.V.

(2020) J Struct Biol 209: 107404-107404

  • DOI: https://doi.org/10.1016/j.jsb.2019.10.006
  • Primary Citation of Related Structures:  
    6SNZ

  • PubMed Abstract: 

    The assembly of intermediate filaments (IFs) including nuclear lamins is driven by specific interactions of the elementary coiled-coil dimers in both lateral and longitudinal direction. The assembly mode A 11 is dependent on lateral tetramerization of the second coiled-coil segment (coil1b) in antiparallel fashion. Recent cryo-electron microscopy studies pointed to 3.5 nm lamin filaments built from two antiparallel threads of longitudinally associated dimers but little molecular detail is available to date. Here we present the 2.6 Å resolution X-ray structure of a lamin A fragment including residues 65-222 which reveals the molecular basis of the A 11 interaction. The crystal structure also indicates a continuous α-helical structure for the preceding linker L1 region. The middle part of the antiparallel tetramer reveals unique interactions due to the lamin-specific 42-residue insert in coil1b. At the same time, distinct characteristics of this insert provide for the preservation of common structural principles shared with lateral coil1b tetramers of vimentin and keratin K1/K10. In addition, structural analysis suggests that the A 11 interaction in lamins is somewhat weaker than in cytoplasmic IFs, despite a 30% longer overlap. Establishing the structural detail of the A 11 interaction across IF types is the first step towards a rational understanding of the IF assembly process which is indispensable for establishing the mechanism of disease-related mutations.


  • Organizational Affiliation

    Laboratory for Biocrystallography, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Belgium.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prelamin-A/C
A, B, C, D
160Homo 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
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.254 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.07α = 90
b = 37.47β = 94.12
c = 101.68γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
autoPROCdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
KU LeuvenBelgiumCELSA18/044
Synchrotron Light Research InstituteFrance20170756

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-23
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-22
    Changes: Database references
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Refinement description