4GEX

Structure of a stabilised ceSAS-6 dimer, second crystal form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Caenorhabditis elegans centriolar protein SAS-6 forms a spiral that is consistent with imparting a ninefold symmetry.

Hilbert, M.Erat, M.C.Hachet, V.Guichard, P.Blank, I.D.Fluckiger, I.Slater, L.Lowe, E.D.Hatzopoulos, G.N.Steinmetz, M.O.Gonczy, P.Vakonakis, I.

(2013) Proc.Natl.Acad.Sci.USA 110: 11373-11378

  • DOI: 10.1073/pnas.1302721110
  • Primary Citation of Related Structures:  
  • Also Cited By: 4TPZ

  • PubMed Abstract: 
  • Centrioles are evolutionary conserved organelles that give rise to cilia and flagella as well as centrosomes. Centrioles display a characteristic ninefold symmetry imposed by the spindle assembly abnormal protein 6 (SAS-6) family. SAS-6 from Chlamydo ...

    Centrioles are evolutionary conserved organelles that give rise to cilia and flagella as well as centrosomes. Centrioles display a characteristic ninefold symmetry imposed by the spindle assembly abnormal protein 6 (SAS-6) family. SAS-6 from Chlamydomonas reinhardtii and Danio rerio was shown to form ninefold symmetric, ring-shaped oligomers in vitro that were similar to the cartwheels observed in vivo during early steps of centriole assembly in most species. Here, we report crystallographic and EM analyses showing that, instead, Caenorhabotis elegans SAS-6 self-assembles into a spiral arrangement. Remarkably, we find that this spiral arrangement is also consistent with ninefold symmetry, suggesting that two distinct SAS-6 oligomerization architectures can direct the same output symmetry. Sequence analysis suggests that SAS-6 spirals are restricted to specific nematodes. This oligomeric arrangement may provide a structural basis for the presence of a central tube instead of a cartwheel during centriole assembly in these species.


    Organizational Affiliation

    Laboratory of Biomolecular Research (LBR), Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Spindle assembly abnormal protein 6
A, B, C, D
170Caenorhabditis elegansMutations: S125E, I156W
Gene Names: sas-6
Find proteins for O62479 (Caenorhabditis elegans)
Go to UniProtKB:  O62479
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 107.870α = 90.00
b = 107.870β = 90.00
c = 165.051γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
xia2data reduction
SCALAdata scaling
BUSTERrefinement
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-19
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Database references
  • Version 1.2: 2013-07-24
    Type: Database references