Complex sentence: Proteases determine the lifetime of other proteins playing important physiological role like hormones, antibodies, or other enzymes--this is one of the fastest "switching on" and "switching off" regulatory mechanisms in the physiology of an organism.
Split into simpler sentences: Proteases determine the lifetime of other proteins playing important physiological role like hormones, antibodies, or other enzymes. This is one of the fastest "switching on" and "switching off" regulatory mechanisms in the physiology of an organism.