Typical DSC thermograms of wild-type lipase T6 and variants Q185L, A269T, Q185L/A269T, and H86Y/A269T. The unfolding temperatures of purified wild-type lipase T6 and its improved variants were measured by DSC (1 mM CaCl2, 5% glycerol, 300 mM NaCl, 50 mM Tris-HCl [pH 7.2]). The thermal-induced unfolding of lipase T6 occurs as a single transition. The thermograms were generated by using Origin software (MicroCal Inc.).