9F5Q image
Entry Detail
PDB ID:
9F5Q
Keywords:
Title:
Crystal structure of selenomethionine-labelled kinetoplastid kinetochore protein KKT23 acetyltransferase domain from Trypanosoma brucei
Biological Source:
PDB Version:
Deposition Date:
2024-04-30
Release Date:
2024-08-28
Method Details:
Experimental Method:
Resolution:
1.95 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:N-acetyltransferase domain-containing protein
Chain IDs:A, B
Chain Length:224
Number of Molecules:2
Biological Source:Trypanosoma brucei brucei TREU927
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
The kinetoplastid kinetochore protein KKT23 acetyltransferase is a structural homolog of GCN5 that acetylates the histone H2A C-terminal tail.
Structure 33 123 ? (2025)
PMID: 39579771 DOI: 10.1016/j.str.2024.10.031

Abstact

The kinetochore is the macromolecular protein machine that drives chromosome segregation in eukaryotes. In an evolutionarily divergent group of organisms called kinetoplastids, kinetochores are built using a unique set of proteins (KKT1-25 and KKIP1-12). KKT23 is a constitutively localized kinetochore protein containing a C-terminal acetyltransferase domain of unknown function. Here, using X-ray crystallography and nuclear magnetic resonance (NMR) spectroscopy, we have determined the structure and dynamics of the KKT23 acetyltransferase domain from Trypanosoma brucei and found that it is structurally similar to the GCN5 histone acetyltransferase domain. We find that KKT23 can acetylate the C-terminal tail of histone H2A and that knockdown of KKT23 results in decreased H2A acetylation levels in T. brucei. Finally, we have determined the crystal structure of the N-terminal region of KKT23 and shown that it interacts with KKT22. Our study provides important insights into the structure and function of the unique kinetochore acetyltransferase in trypanosomes.

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Primary Citation of related structures