2.4.2.57 DELTAN1-84 mutant enzyme lacking the N-terminal 22 residues aggregates at 75°C 725719 2.4.2.57 additional information all the mutants, forming smaller assemblies, display a decrease in thermostability compared to the wild-type enzyme. Tk-AMPpaseDELTAC10 aggregates at temperatures of 80°C or higher, while aggregation of Tk-AMPpaseDELTAN84 is observed at 75°C and that of Tk-AMPpase?N84DELTAC10 is observed at 70°C 725719