Effects of methylxanthines on superprecipitation of myosin B extracted from rabbit fast skeletal muscle.

Myosin B was extracted from rabbit fast skeletal muscle. Caffeine (2-70 mM), theophylline (2-30 mM), and theobromine (2 mM) were examined for their effects on the rate and extent of myosin B superprecipitation at a low ionic strength (50 mM KCl) and a low concentration of ATP (40 microM) by the turbidimetric method. The rate of the superprecipitation was… CONTINUE READING