4GKW

Crystal Structure of the Coiled-coil Domain of C. elegans SAS-6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.258 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

SAS-6 coiled-coil structure and interaction with SAS-5 suggest a regulatory mechanism in C. elegans centriole assembly.

Qiao, R.Cabral, G.Lettman, M.M.Dammermann, A.Dong, G.

(2012) Embo J. 31: 4334-4347

  • DOI: 10.1038/emboj.2012.280

  • PubMed Abstract: 
  • The centriole is a conserved microtubule-based organelle essential for both centrosome formation and cilium biogenesis. Five conserved proteins for centriole duplication have been identified. Two of them, SAS-5 and SAS-6, physically interact with eac ...

    The centriole is a conserved microtubule-based organelle essential for both centrosome formation and cilium biogenesis. Five conserved proteins for centriole duplication have been identified. Two of them, SAS-5 and SAS-6, physically interact with each other and are codependent for their targeting to procentrioles. However, it remains unclear how these two proteins interact at the molecular level. Here, we demonstrate that the short SAS-5 C-terminal domain (residues 390-404) specifically binds to a narrow central region (residues 275-288) of the SAS-6 coiled coil. This was supported by the crystal structure of the SAS-6 coiled-coil domain (CCD), which, together with mutagenesis studies, indicated that the association is mediated by synergistic hydrophobic and electrostatic interactions. The crystal structure also shows a periodic charge pattern along the SAS-6 CCD, which gives rise to an anti-parallel tetramer. Overall, our findings establish the molecular basis of the specific interaction between SAS-5 and SAS-6, and suggest that both proteins individually adopt an oligomeric conformation that is disrupted upon the formation of the hetero-complex to facilitate the correct assembly of the nine-fold symmetric centriole.


    Organizational Affiliation

    Max F Perutz Laboratories, Medical University of Vienna, Vienna, Austria.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Spindle assembly abnormal protein 6
A, B
167Caenorhabditis elegansMutation(s): 0 
Gene Names: sas-6
Find proteins for O62479 (Caenorhabditis elegans)
Go to UniProtKB:  O62479
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.258 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 140.290α = 90.00
b = 140.290β = 90.00
c = 74.670γ = 120.00
Software Package:
Software NamePurpose
ADSCdata collection
SCALAdata scaling
CNSrefinement
SHELXSphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-08-13 
  • Released Date: 2012-11-21 
  • Deposition Author(s): Qiao, R., Dong, G.

Revision History 

  • Version 1.0: 2012-11-21
    Type: Initial release
  • Version 1.1: 2012-11-28
    Type: Database references