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Myosin extractability from thermally treated carp myofibrils (Mf) was measured as a possible indicator for Mf denaturation. Mf thermally treated at 40°C in 0.1M KCl, 20mM Tris-HCl (pH 7.5) was dissolved in 0.5M KCl, and salted out with ammonium sulfate at 40% saturation in the presence of 5mM ATP-Mg. The amounts of myosin recovered in the supernatant decreased rapidly (within 15min), and the rate was much greater than the inactivation rate of its Ca-ATPase. Nevertheless, myosin obtained in the supernatant exhibited an identical Ca-ATPase activity regardless of the thermal treatment period of Mf, and this myosin was proved to be monomeric by Sepharose CL-4B gel filtration. Therefore, myosin extractability could be used as a sensitive indicator for Mf denaturation.

Myosin Extractability as a Sensitive Probe for the Thermal Denaturation of Carp Myofibrils.