Crystal structure of the head domain of human CCDC61

Experimental Data Snapshot

  • Resolution: 2.55 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.213 

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CCDC61/VFL3 Is a Paralog of SAS6 and Promotes Ciliary Functions.

Ochi, T.Quarantotti, V.Lin, H.Jullien, J.Rosa E Silva, I.Boselli, F.Barnabas, D.D.Johnson, C.M.McLaughlin, S.H.Freund, S.M.V.Blackford, A.N.Kimata, Y.Goldstein, R.E.Jackson, S.P.Blundell, T.L.Dutcher, S.K.Gergely, F.van Breugel, M.

(2020) Structure 28: 674

  • DOI: https://doi.org/10.1016/j.str.2020.04.010
  • Primary Citation of Related Structures:  
    6HXT, 6HXV, 6HXY

  • PubMed Abstract: 

    Centrioles are cylindrical assemblies whose peripheral microtubule array displays a 9-fold rotational symmetry that is established by the scaffolding protein SAS6. Centriole symmetry can be broken by centriole-associated structures, such as the striated fibers in Chlamydomonas that are important for ciliary function. The conserved protein CCDC61/VFL3 is involved in this process, but its exact role is unclear. Here, we show that CCDC61 is a paralog of SAS6. Crystal structures of CCDC61 demonstrate that it contains two homodimerization interfaces that are similar to those found in SAS6, but result in the formation of linear filaments rather than rings. Furthermore, we show that CCDC61 binds microtubules and that residues involved in CCDC61 microtubule binding are important for ciliary function in Chlamydomonas. Together, our findings suggest that CCDC61 and SAS6 functionally diverged from a common ancestor while retaining the ability to scaffold the assembly of basal body-associated structures or centrioles, respectively.

  • Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge CB2 0QH, UK. Electronic address: T.Ochi@leeds.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Coiled-coil domain-containing protein 61
A, B, C
145Homo sapiensMutation(s): 0 
Gene Names: CCDC61
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y6R9 (Homo sapiens)
Explore Q9Y6R9 
Go to UniProtKB:  Q9Y6R9
GTEx:  ENSG00000104983 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y6R9
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C
Experimental Data & Validation

Experimental Data

  • Resolution: 2.55 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.213 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.877α = 90
b = 68.222β = 90
c = 180.728γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United Kingdom--
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2020-04-29
    Type: Initial release
  • Version 1.1: 2020-05-06
    Changes: Database references
  • Version 1.2: 2020-05-20
    Changes: Database references
  • Version 1.3: 2020-06-10
    Changes: Database references