Crystal structure of lamin B1 Ig-like domain from human

Experimental Data Snapshot

  • Resolution: 3.60 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 

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Beta-strand-mediated dimeric formation of the Ig-like domains of human lamin A/C and B1.

Ahn, J.Lee, J.Jeong, S.Kang, S.M.Park, B.J.Ha, N.C.

(2021) Biochem Biophys Res Commun 550: 191-196

  • DOI: https://doi.org/10.1016/j.bbrc.2021.02.102
  • Primary Citation of Related Structures:  
    7CRG, 7DTG

  • PubMed Abstract: 

    Lamins are nuclear intermediate filament proteins that play an essential role in maintaining the nuclear structure by forming a 3-D meshwork. Lamins consist of the N-terminal unstructured head, the coiled-coil rod domain, and the C-terminal tail, which is mostly unstructured except for the Ig-like domain. To date, the Ig-like domain has been characterized as a monomeric structure. Here, we determined the crystal structures of human lamin A/C, including the Ig-like domain and its N- and C-terminal flanking sequences. Interestingly, the structures showed a homodimer formed by beta-strand interactions between the N- and C-terminal flanking sequences. This interaction also provides a molecular implication for the creation of a 3-D meshwork between the 3.5-nm-thick filaments. Furthermore, we determined the crystal structure of the corresponding region of lamin B1. The structure showed a similar dimeric assembly, also formed by beta-strand interactions, albeit the intersubunit distance was much shorter. Since the Ig-like domain contains many genetic hotspots causing lamin-related diseases in lamin A/C, our findings will help understand the detailed assembly of lamins in a 3-D meshwork structure and lamin-related diseases at the molecular level.

  • Organizational Affiliation

    Department of Agricultural Biotechnology, Centre for Food Safety and Toxicology, Centre for Food and Bioconvergence, Research Institute for Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lamin-B1149Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P20700 (Homo sapiens)
Explore P20700 
Go to UniProtKB:  P20700
PHAROS:  P20700
GTEx:  ENSG00000113368 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20700
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.60 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.647α = 90
b = 160.751β = 90
c = 132.805γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-03
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Refinement description