Structure of an N-terminal fragment of Leishmania SAS-6 containing parts of its coiled coil domain, F257E mutant

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 

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This is version 1.4 of the entry. See complete history


Structure of the SAS-6 cartwheel hub from Leishmania major.

van Breugel, M.Wilcken, R.McLaughlin, S.H.Rutherford, T.J.Johnson, C.M.

(2014) Elife 3: e01812-e01812

  • DOI: https://doi.org/10.7554/eLife.01812
  • Primary Citation of Related Structures:  
    4CKM, 4CKN, 4CKP

  • PubMed Abstract: 

    Centrioles are cylindrical cell organelles with a ninefold symmetric peripheral microtubule array that is essential to template cilia and flagella. They are built around a central cartwheel assembly that is organized through homo-oligomerization of the centriolar protein SAS-6, but whether SAS-6 self-assembly can dictate cartwheel and thereby centriole symmetry is unclear. Here we show that Leishmania major SAS-6 crystallizes as a 9-fold symmetric cartwheel and provide the X-ray structure of this assembly at a resolution of 3.5 Å. We furthermore demonstrate that oligomerization of Leishmania SAS-6 can be inhibited by a small molecule in vitro and provide indications for its binding site. Our results firmly establish that SAS-6 can impose cartwheel symmetry on its own and indicate how this process might occur mechanistically in vivo. Importantly, our data also provide a proof-of-principle that inhibition of SAS-6 oligomerization by small molecules is feasible. DOI: http://dx.doi.org/10.7554/eLife.01812.001.

  • Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
226Leishmania majorMutation(s): 1 
Find proteins for E9AFQ5 (Leishmania major)
Explore E9AFQ5 
Go to UniProtKB:  E9AFQ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE9AFQ5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.855α = 90
b = 81.253β = 91.5
c = 133.149γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-05
    Type: Initial release
  • Version 1.1: 2014-03-12
    Changes: Database references
  • Version 1.2: 2014-03-19
    Changes: Database references
  • Version 1.3: 2018-01-17
    Changes: Database references
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Other, Refinement description