4FI9

Structure of human SUN-KASH complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.241 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insights into SUN-KASH complexes across the nuclear envelope.

Wang, W.Shi, Z.Jiao, S.Chen, C.Wang, H.Liu, G.Wang, Q.Zhao, Y.Greene, M.I.Zhou, Z.

(2012) Cell Res. 22: 1440-1452

  • DOI: 10.1038/cr.2012.126

  • PubMed Abstract: 
  • Linker of the nucleoskeleton and the cytoskeleton (LINC) complexes are composed of SUN and KASH domain-containing proteins and bridge the inner and outer membranes of the nuclear envelope. LINC complexes play critical roles in nuclear positioning, ce ...

    Linker of the nucleoskeleton and the cytoskeleton (LINC) complexes are composed of SUN and KASH domain-containing proteins and bridge the inner and outer membranes of the nuclear envelope. LINC complexes play critical roles in nuclear positioning, cell polarization and cellular stiffness. Previously, we reported the homotrimeric structure of human SUN2. We have now determined the crystal structure of the human SUN2-KASH complex. In the complex structure, the SUN domain homotrimer binds to three independent "hook"-like KASH peptides. The overall conformation of the SUN domain in the complex closely resembles the SUN domain in its apo state. A major conformational change involves the AA'-loop of KASH-bound SUN domain, which rearranges to form a mini β-sheet that interacts with the KASH peptide. The PPPT motif of the KASH domain fits tightly into a hydrophobic pocket on the homotrimeric interface of the SUN domain, which we termed the BI-pocket. Moreover, two adjacent protomers of the SUN domain homotrimer sandwich the KASH domain by hydrophobic interaction and hydrogen bonding. Mutations of these binding sites disrupt or reduce the association between the SUN and KASH domains in vitro. In addition, transfection of wild-type, but not mutant, SUN2 promotes cell migration in Ovcar-3 cells. These results provide a structural model of the LINC complex, which is essential for additional study of the physical and functional coupling between the cytoplasm and the nucleoplasm.


    Organizational Affiliation

    State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUN domain-containing protein 2
A
195Homo sapiensMutation(s): 0 
Gene Names: SUN2 (FRIGG, KIAA0668, RAB5IP, UNC84B)
Find proteins for Q9UH99 (Homo sapiens)
Go to Gene View: SUN2
Go to UniProtKB:  Q9UH99
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nesprin-2
B
14Homo sapiensMutation(s): 0 
Gene Names: SYNE2 (KIAA1011, NUA)
Find proteins for Q8WXH0 (Homo sapiens)
Go to Gene View: SYNE2
Go to UniProtKB:  Q8WXH0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.241 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 79.835α = 90.00
b = 79.835β = 90.00
c = 280.221γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHENIXmodel building
Blu-Icedata collection
REFMACrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-06-08 
  • Released Date: 2012-07-18 
  • Deposition Author(s): Wang, W.J., Shi, Z.B.

Revision History 

  • Version 1.0: 2012-07-18
    Type: Initial release
  • Version 1.1: 2013-03-06
    Type: Database references