6ZPK

Crystal structure of the unconventional kinetochore protein Trypanosoma brucei KKT4 BRCT domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 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 ...

    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.


    Related Citations: 
    • Structural characterisation of KKT4, an unconventional microtubule-binding kinetochore protein
      Ludzia, P., Lowe, E., Marciano, G., Mohammed, S., Redfield, C., Akiyoshi, B.
      (2020) Biorxiv --: --

    Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK. Electronic address: bungo.akiyoshi@bioch.ox.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Trypanosoma brucei KKT4 463-645A185Trypanosoma brucei brucei TREU927Mutation(s): 0 
Gene Names: Tb927.8.3680
UniProt
Find proteins for Q580Y8 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Explore Q580Y8 
Go to UniProtKB:  Q580Y8
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.368α = 90
b = 61.633β = 90
c = 67.785γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
DIALSdata scaling
BUCCANEERmodel building
Arcimboldophasing
DIALSdata reduction

Structure Validation

View Full Validation Report




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