6TLX

Crystal structure of the unconventional kinetochore protein Perkinsela sp. KKT2a central domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.87 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Kinetoplastid kinetochore proteins KKT2 and KKT3 have unique centromere localization domains.

Marciano, G.Ishii, M.Nerusheva, O.O.Akiyoshi, B.

(2021) J Cell Biol 220

  • DOI: 10.1083/jcb.202101022
  • Primary Citation of Related Structures:  
    6TLY, 6TLX

  • PubMed Abstract: 
  • The kinetochore is the macromolecular protein complex that assembles onto centromeric DNA and binds spindle microtubules. Evolutionarily divergent kinetoplastids have an unconventional set of kinetochore proteins. It remains unknown how kinetochores assemble at centromeres in these organisms ...

    The kinetochore is the macromolecular protein complex that assembles onto centromeric DNA and binds spindle microtubules. Evolutionarily divergent kinetoplastids have an unconventional set of kinetochore proteins. It remains unknown how kinetochores assemble at centromeres in these organisms. Here, we characterize KKT2 and KKT3 in the kinetoplastid parasite Trypanosoma brucei. In addition to the N-terminal kinase domain and C-terminal divergent polo boxes, these proteins have a central domain of unknown function. We show that KKT2 and KKT3 are important for the localization of several kinetochore proteins and that their central domains are sufficient for centromere localization. Crystal structures of the KKT2 central domain from two divergent kinetoplastids reveal a unique zinc-binding domain (termed the CL domain for centromere localization), which promotes its kinetochore localization in T. brucei. Mutations in the equivalent domain in KKT3 abolish its kinetochore localization and function. Our work shows that the unique central domains play a critical role in mediating the centromere localization of KKT2 and KKT3.


    Related Citations: 
    • Unconventional kinetochore kinases KKT2 and KKT3 have a unique zinc finger that promotes their kinetochore localization
      Marciano, G., Nerusheva, O., Ishii, M., Akiyoshi, B.
      (2019) Biorxiv --: --

    Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein kinaseA131Perkinsela sp. CCAP 1560/4Mutation(s): 0 
Gene Names: XU18_4017
UniProt
Find proteins for A0A0L1KLX8 (Perkinsela sp. CCAP 1560/4)
Explore A0A0L1KLX8 
Go to UniProtKB:  A0A0L1KLX8
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.87 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.254 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.845α = 90
b = 113.845β = 90
c = 46.013γ = 120
Software Package:
Software NamePurpose
BUSTERrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
DIALSdata reduction
CRANK2phasing
SHARPphasing

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: 2019-12-25
    Type: Initial release
  • Version 1.1: 2021-06-23
    Changes: Database references