Crystal structure of the unconventional kinetochore protein Leishmania mexicana KKT4 coiled coil domain

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

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Structural characterization of KKT4, an unconventional microtubule-binding kinetochore protein.

Ludzia, P.Lowe, E.D.Marciano, G.Mohammed, S.Redfield, C.Akiyoshi, B.

(2021) Structure 29: 1014-1028.e8

  • DOI: https://doi.org/10.1016/j.str.2021.04.004
  • Primary Citation of Related Structures:  
    6ZPJ, 6ZPK, 6ZPM

  • PubMed Abstract: 

    The kinetochore is the macromolecular machinery that drives chromosome segregation by interacting with spindle microtubules. Kinetoplastids (such as Trypanosoma brucei), a group of evolutionarily divergent eukaryotes, have a unique set of kinetochore proteins that lack any significant homology to canonical kinetochore components. To date, KKT4 is the only kinetoplastid kinetochore protein that is known to bind microtubules. Here we use X-ray crystallography, NMR spectroscopy, and crosslinking mass spectrometry to characterize the structure and dynamics of KKT4. We show that its microtubule-binding domain consists of a coiled-coil structure followed by a positively charged disordered tail. The structure of the C-terminal BRCT domain of KKT4 reveals that it is likely a phosphorylation-dependent protein-protein interaction domain. The BRCT domain interacts with the N-terminal region of the KKT4 microtubule-binding domain and with a phosphopeptide derived from KKT8. Taken together, these results provide structural insights into the unconventional kinetoplastid kinetochore protein KKT4.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leishmania mexicana KKT4
A, B
126Leishmania mexicana MHOM/GT/2001/U1103Mutation(s): 1 
Gene Names: LMXM_10_0300
Find proteins for E9AN40 (Leishmania mexicana (strain MHOM/GT/2001/U1103))
Explore E9AN40 
Go to UniProtKB:  E9AN40
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE9AN40
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.31α = 90
b = 37.71β = 92.17
c = 122.39γ = 90
Software Package:
Software NamePurpose
BUCCANEERmodel building
Aimlessdata scaling
DIALSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom210622/Z/18/Z

Revision History  (Full details and data files)

  • Version 1.0: 2020-10-21
    Type: Initial release
  • Version 1.1: 2021-05-19
    Changes: Database references
  • Version 1.2: 2021-09-15
    Changes: Database references
  • Version 1.3: 2024-06-19
    Changes: Data collection, Database references