4C9Y

Structural Basis for the microtubule binding of the human kinetochore Ska complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structural Basis for Microtubule Recognition by the Human Kinetochore Ska Complex.

Abad, M.A.Medina, B.Santamaria, A.Zou, J.Plasberg-Hill, C.Madhumalar, A.Jayachandran, U.Redli, P.M.Rappsilber, J.Nigg, E.A.Jeyaprakash, A.A.

(2014) Nat Commun 5: 2964

  • DOI: https://doi.org/10.1038/ncomms3964
  • Primary Citation of Related Structures:  
    4C9Y, 4CA0

  • PubMed Abstract: 

    The ability of kinetochores (KTs) to maintain stable attachments to dynamic microtubule structures ('straight' during microtubule polymerization and 'curved' during microtubule depolymerization) is an essential requirement for accurate chromosome segregation. Here we show that the kinetochore-associated Ska complex interacts with tubulin monomers via the carboxy-terminal winged-helix domain of Ska1, providing the structural basis for the ability to bind both straight and curved microtubule structures. This contrasts with the Ndc80 complex, which binds straight microtubules by recognizing the dimeric interface of tubulin. The Ska1 microtubule-binding domain interacts with tubulins using multiple contact sites that allow the Ska complex to bind microtubules in multiple modes. Disrupting either the flexibility or the tubulin contact sites of the Ska1 microtubule-binding domain perturbs normal mitotic progression, explaining the critical role of the Ska complex in maintaining a firm grip on dynamic microtubules.


  • Organizational Affiliation

    1] Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh, Michael Swann Building, Kings Buildings, Mayfield Road, EH9 3JR Edinburgh, UK [2] Department of Biotechnology, Technische Universität Berlin, 13353 Berlin, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SPINDLE AND KINETOCHORE-ASSOCIATED PROTEIN 1
A, B
123Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q96BD8 (Homo sapiens)
Explore Q96BD8 
Go to UniProtKB:  Q96BD8
GTEx:  ENSG00000154839 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96BD8
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.199 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.006α = 90
b = 161.578β = 90
c = 104.482γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-22
    Type: Initial release