Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 73.09 kDa 
• Atom Count: 4939 
• Residue Count: 604 
• Unique protein chains: 1

6SNZ

Crystal structure of lamin A coil1b tetramer

• DOI: 10.2210/pdb6SNZ/pdb

• Classification: NUCLEAR PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-08-28 Released: 2019-10-23 
• Deposition Author(s): Lilina, A.V., Chernyatina, A.A., Guzenko, D., Strelkov, S.V.
• Funding Organization(s): KU Leuven, Synchrotron Light Research Institute

---

Experimental Data Snapshot

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

Literature

Lateral A11type tetramerization in lamins.

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

(2020) J Struct Biol 209: 107404-107404

• PubMed: 31610238 
• 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 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: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Prelamin-A/C	A, B, C, D	160	Homo sapiens	Mutation(s): 0  Gene Names: LMNA, LMN1
Find proteins for P02545 (Homo sapiens) Explore P02545  Go to UniProtKB:  P02545
NIH Common Fund Data Resources
PHAROS:  P02545 GTEx:  ENSG00000160789

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	A, C	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

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 = 88.07	α = 90
b = 37.47	β = 94.12
c = 101.68	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
XDS	data reduction
AutoPROC	data scaling
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2019-08-28 
• Released Date: 2019-10-23 
Deposition Author(s): Lilina, A.V., Chernyatina, A.A., Guzenko, D., Strelkov, S.V.

---

Funding Organization	Location	Grant Number
KU Leuven	Belgium	CELSA18/044
Synchrotron Light Research Institute	France	20170756

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