4GV8 image
Entry Detail
PDB ID:
4GV8
Keywords:
Title:
DUTPase from phage phi11 of S.aureus: visualization of the species-specific insert
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-08-30
Release Date:
2013-09-11
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 43 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DUTPase
Chain IDs:A, B, C, D, E, F
Chain Length:169
Number of Molecules:6
Biological Source:Staphylococcus phage 11
Primary Citation
Structure and enzymatic mechanism of a moonlighting dUTPase
Acta Crystallogr.,Sect.D 69 2298 2308 (2013)
PMID: 24311572 DOI: 10.1107/S0907444913021136

Abstact

Genome integrity requires well controlled cellular pools of nucleotides. dUTPases are responsible for regulating cellular dUTP levels and providing dUMP for dTTP biosynthesis. In Staphylococcus, phage dUTPases are also suggested to be involved in a moonlighting function regulating the expression of pathogenicity-island genes. Staphylococcal phage trimeric dUTPase sequences include a specific insertion that is not found in other organisms. Here, a 2.1 Å resolution three-dimensional structure of a ϕ11 phage dUTPase trimer with complete localization of the phage-specific insert, which folds into a small β-pleated mini-domain reaching out from the dUTPase core surface, is presented. The insert mini-domains jointly coordinate a single Mg2+ ion per trimer at the entrance to the threefold inner channel. Structural results provide an explanation for the role of Asp95, which is suggested to have functional significance in the moonlighting activity, as the metal-ion-coordinating moiety potentially involved in correct positioning of the insert. Enzyme-kinetics studies of wild-type and mutant constructs show that the insert has no major role in dUTP binding or cleavage and provide a description of the elementary steps (fast binding of substrate and release of products). In conclusion, the structural and kinetic data allow insights into both the phage-specific characteristics and the generally conserved traits of ϕ11 phage dUTPase.

Legend

Protein

Chemical

Disease

Primary Citation of related structures