Nucleoside Triphosphate Pyrophosphohydrolase (EC 3.6.1.8) MazG-like domain found in Deinococcus radiodurans DR2231 protein and its bacterial homologs
This family corresponds to the DR2231 protein, a MazG-like NTP-PPase from Deinococcus radiodurans, and its bacterial homologs. All family members contain a well-conserved divalent ion binding motif, EXXEX(12-28)EXXD, which is the identity signature for all-alpha-helical NTP-PPase superfamily. DR2231 shows significant structural resemblance to MazG proteins, but is functionally related to the dimeric dUTPases. It might be an evolutionary precursor of dimeric dUTPases with very high specificity in hydrolyzing dUTP into dUMP, but an inability to hydrolyze dTTP, a typical feature of dUTPases. Moreover, unlike the dUPase monomer containing a single active site, the DR2231 protein dimer holds two putative active sites.
Structure:2YFD; Deinococcus radiodurans DR2231 protein dimer holds two putative active sites, one of which binds dUMP/Mg2+ complex and the other binds Mg2+, contacts at 4A.
Jiyao W et al.(2023). "The conserved domain database in 2023.",