2.6.1.16 37 - 90 min, complete loss of activity without stabilizing agent. Dithiothreitol, D-fructose 6-phosphate, D-glucose 6-phosphate or L-glutamine, 1 mM, increase thermal stability at 37°C 639921 2.6.1.16 45 - half-life of 1 h at 45°C 706608 2.6.1.16 45 60 - 737920 2.6.1.16 50 - activity of the wild type enzyme is not affected by incubation at 50°C for 60 min 672444