PP2C-like phosphatase that can dephosphorylate YegI. In vitro, can hydrolyze p-nitrophenyl phosphate (pNPP) to p-nitrophenol. H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Activity dramatically decreases in the presence of the general protein phosphatase inhibitor sodium phosphate. Slightly inhibited by sodium fluoride. Activity decreases in the presence of the metal chelator EDTA. kcat is 0.093 sec(-1) with pNPP as substrate. Phosphorylated by YegI.