2.7.4.25 D132A site directed mutagenesis 676227 2.7.4.25 D132A the mutant shows reduced activity compared to the wild type enzyme, the mutation has the most dramatic consequences on the protein stability as Tm decreases by 9°C in comparison with the wild type protein, an increase in the specificity of the D132A variant for UMP over CMP and dCMP is observed 692282 2.7.4.25 D132A the substitution results in a moderate decrease in stability without significant changes in Km value for CMP and dCMP 692282 2.7.4.25 D132H site directed mutagenesis 676227 2.7.4.25 D132H the mutant shows reduced activity compared to the wild type enzyme 692282 2.7.4.25 D132H the substitution results in a moderate decrease in stability without significant changes in Km value for CMP and dCMP, the D132H variant does not introduce charge reversal, because His is calculated to be deprotonated 692282 2.7.4.25 D132N site directed mutagenesis 676227 2.7.4.25 D132N the mutant shows reduced activity compared to the wild type enzyme 692282 2.7.4.25 D132N the substitution results in a moderate decrease in stability without significant changes in Km value for CMP and dCMP 692282 2.7.4.25 D132S site directed mutagenesis 676227