Thermostability. The activities of refolded T. aquaticus SCS (squares) and the natively folded enzyme (circles) at different temperatures are plotted. The activities were measured in 10 mM MgCl2, 50 mM KCl, 0.1 mM dithiothreitol, 10 mM succinate, 0.1 mM CoA, 0.4 mM ATP and 10 mM potassium phosphate pH 7.4.