6Z26

Structure of the Danio rerio SAS-6 coiled-coil domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.277 
  • R-Value Observed: 0.278 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of SAS-6 coiled coil hold implications for the polarity of the centriolar cartwheel.

Kantsadi, A.L.Hatzopoulos, G.N.Gonczy, P.Vakonakis, I.

(2022) Structure 30: 671

  • DOI: https://doi.org/10.1016/j.str.2022.02.005
  • Primary Citation of Related Structures:  
    6YRL, 6YRN, 6YS4, 6Z26

  • PubMed Abstract: 

    Centrioles are eukaryotic organelles that template the formation of cilia and flagella, as well as organize the microtubule network and the mitotic spindle in animal cells. Centrioles have proximal-distal polarity and a 9-fold radial symmetry imparted by a likewise symmetrical central scaffold, the cartwheel. The spindle assembly abnormal protein 6 (SAS-6) self-assembles into 9-fold radially symmetric ring-shaped oligomers that stack via an unknown mechanism to form the cartwheel. Here, we uncover a homo-oligomerization interaction mediated by the coiled-coil domain of SAS-6. Crystallographic structures of Chlamydomonas reinhardtii SAS-6 coiled-coil complexes suggest this interaction is asymmetric, thereby imparting polarity to the cartwheel. Using a cryoelectron microscopy (cryo-EM) reconstitution assay, we demonstrate that amino acid substitutions disrupting this asymmetric association also impair SAS-6 ring stacking. Our work raises the possibility that the asymmetric interaction inherent to SAS-6 coiled-coil provides a polar element for cartwheel assembly, which may assist the establishment of the centriolar proximal-distal axis.


  • Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Spindle assembly abnormal protein 6 homolog
A, B, C, D
118Danio rerioMutation(s): 2 
Gene Names: sass6sas6zgc:55668
UniProt
Find proteins for Q7ZVT3 (Danio rerio)
Explore Q7ZVT3 
Go to UniProtKB:  Q7ZVT3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7ZVT3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.277 
  • R-Value Observed: 0.278 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.38α = 90
b = 70.306β = 90
c = 98.736γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
XSCALEdata scaling
CRANK2phasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European CommissionUnited KingdomMSCA 752069
Medical Research Council (MRC, United Kingdom)United KingdomMR/N009274/1

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-26
    Type: Initial release
  • Version 1.1: 2022-03-16
    Changes: Database references
  • Version 1.2: 2022-05-18
    Changes: Database references