3UNP

Structure of human SUN2 SUN domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of Sad1-UNC84 homology (SUN) domain defines features of molecular bridge in nuclear envelope

Zhou, Z.C.Du, X.Cai, Z.Song, X.Zhang, H.Mizuno, T.Suzuki, E.Yee, M.R.Berezov, A.Murali, R.Wu, S.-L.Karger, B.L.Greene, M.I.Wang, Q.

(2012) J Biol Chem 287: 5317-5326

  • DOI: 10.1074/jbc.M111.304543
  • Primary Citation of Related Structures:  
    3UNP

  • PubMed Abstract: 
  • The SUN (Sad1-UNC-84 homology) domain is conserved in a number of nuclear envelope proteins involved in nuclear migration, meiotic telomere tethering, and antiviral responses. The LINC (linker of nucleoskeleton and cytoskeleton) complex, formed by the SUN and the nesprin proteins at the nuclear envelope, serves as a mechanical linkage across the nuclear envelope ...

    The SUN (Sad1-UNC-84 homology) domain is conserved in a number of nuclear envelope proteins involved in nuclear migration, meiotic telomere tethering, and antiviral responses. The LINC (linker of nucleoskeleton and cytoskeleton) complex, formed by the SUN and the nesprin proteins at the nuclear envelope, serves as a mechanical linkage across the nuclear envelope. Here we report the crystal structure of the SUN2 protein SUN domain, which reveals a homotrimer. The SUN domain is sufficient to mediate binding to the KASH (Klarsicht, ANC-1, and Syne homology) domain of nesprin 2, and the regions involved in the interaction have been identified. Binding of the SUN domain to the KASH domain is abolished by deletion of a region important for trimerization or by point mutations associated with nuclear migration failure. We propose a model of the LINC complex, where the SUN and the KASH domains form a higher ordered oligomeric network in the nuclear envelope. These findings provide the structural basis for understanding the function and the regulation of the LINC complex.


    Organizational Affiliation

    Department of Pathology and Laboratory Medicine, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania 19104, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SUN domain-containing protein 2A203Homo sapiensMutation(s): 0 
Gene Names: SUN2FRIGGKIAA0668RAB5IPUNC84B
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UH99 (Homo sapiens)
Explore Q9UH99 
Go to UniProtKB:  Q9UH99
PHAROS:  Q9UH99
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACE
Query on ACE

Download Ideal Coordinates CCD File 
B [auth A]ACETYL GROUP
C2 H4 O
IKHGUXGNUITLKF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.223 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.918α = 90
b = 78.918β = 90
c = 197.918γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
SOLVEphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-21
    Type: Initial release
  • Version 1.1: 2013-03-06
    Changes: Database references