8P8O image
Entry Detail
PDB ID:
8P8O
Keywords:
Title:
M. tuberculosis dUTPase - Stl1-159 (StlNT) complex structure
Biological Source:
PDB Version:
Deposition Date:
2023-06-02
Release Date:
2024-11-27
Method Details:
Experimental Method:
Resolution:
3.40 Å
R-Value Free:
0.28
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Deoxyuridine 5'-triphosphate nucleotidohydrolase
Chain IDs:A, B, C, D, E, F (auth: G)
Chain Length:174
Number of Molecules:6
Biological Source:Mycobacterium tuberculosis
Polymer Type:polypeptide(L)
Description:Orf20
Chain IDs:G (auth: H), H (auth: I), I (auth: J), J (auth: F), K, L
Chain Length:165
Number of Molecules:6
Biological Source:Staphylococcus aureus
Ligand Molecules
Primary Citation
The homodimerization domain of the Stl repressor is crucial for efficient inhibition of mycobacterial dUTPase.
Sci Rep 14 27171 27171 (2024)
PMID: 39511242 DOI: 10.1038/s41598-024-76349-2

Abstact

The dUTPase is a key DNA repair enzyme in Mycobacterium tuberculosis, and it may serve as a novel promising anti-tuberculosis target. Stl repressor from Staphylococcus aureus was shown to bind to and inhibit dUTPases from various sources, and its expression in mycobacterial cells interfered with cell growth. To fine-tune and optimize Stl-induced inhibition of mycobacterial dUTPase, we aimed to decipher the molecular details of this interaction. Structural background of the complex between dUTPase and a truncated Stl lacking the repressor C-terminal homodimerization domain has been described, however, the effects of this truncation of Stl on enzyme binding and inhibition are still not known. Using several independent biophysical, structural and enzyme kinetic methods, here we show that lack of the repressor homodimerization domain strongly perturbs both enzyme binding and inhibition. We also investigated the role of a mycobacteria-specific loop in the Stl-interaction. Our results show that removal of this loop leads to a ten-fold increase in the apparent inhibition constant of Stl. We present a high-resolution three-dimensional structure of mycobacterial dUTPase lacking the genus-specific loop for structural insight. Our present data suggest that potent inhibition of mycobacterial dUTPase by Stl requires the wild-type full-length protein context.

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Primary Citation of related structures