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 

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This is version 1.2 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: 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 tetrameri ...

    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. Electronic address: sergei.strelkov@kuleuven.be.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Prelamin-A/C ABCD160Homo sapiensMutation(s): 0 
Gene Names: LMNALMN1
Find proteins for P02545 (Homo sapiens)
Explore P02545 
Go to UniProtKB:  P02545
NIH Common Fund Data Resources
PHAROS:  P02545
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
A, C
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
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 

  • 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