4.2.1.28 10-20% glycerol stabilizes component F at 0°C 5623 4.2.1.28 calcium-deprived apoenzyme is unstable when incubated at 37°C in the absence of both Ca2+ and substrate 714211 4.2.1.28 limited proteolysis of the enzyme with trypsin converts the enzyme into a highly soluble form without loss of activity 664378 4.2.1.28 sensitive to most solubilization procedures, dithiothreitol stabilizes 5626 4.2.1.28 ternary complex photostable, coenzyme alone photolabile 5612, 5619