7QRO image
Entry Detail
PDB ID:
7QRO
Keywords:
Title:
Crystal structure of the unconventional kinetochore protein Trypanosoma brucei KKT4 BRCT domain K543A mutant
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-01-11
Release Date:
2022-02-09
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Trypanosoma brucei KKT4 463-645 K543A
Mutations:K543A
Chain IDs:A
Chain Length:183
Number of Molecules:1
Biological Source:Trypanosoma brucei brucei
Primary Citation
NMR study of the structure and dynamics of the BRCT domain from the kinetochore protein KKT4.
Biomol.Nmr Assign. 18 15 25 (2024)
PMID: 38453826 DOI: 10.1007/s12104-024-10163-9

Abstact

KKT4 is a multi-domain kinetochore protein specific to kinetoplastids, such as Trypanosoma brucei. It lacks significant sequence similarity to known kinetochore proteins in other eukaryotes. Our recent X-ray structure of the C-terminal region of KKT4 shows that it has a tandem BRCT (BRCA1 C Terminus) domain fold with a sulfate ion bound in a typical binding site for a phosphorylated serine or threonine. Here we present the 1H, 13C and 15N resonance assignments for the BRCT domain of KKT4 (KKT4463-645) from T. brucei. We show that the BRCT domain can bind phosphate ions in solution using residues involved in sulfate ion binding in the X-ray structure. We have used these assignments to characterise the secondary structure and backbone dynamics of the BRCT domain in solution. Mutating the residues involved in phosphate ion binding in T. brucei KKT4 BRCT results in growth defects confirming the importance of the BRCT phosphopeptide-binding activity in vivo. These results may facilitate rational drug design efforts in the future to combat diseases caused by kinetoplastid parasites.

Legend

Protein

Chemical

Disease

Primary Citation of related structures