Abstract
1. 1. Tropinins were isolated from the striated adductor muscle of ezo-giant scallop and akazara scallop, and biochemical properties were comparatively studied. 2. 2. The ezo-giant scallop and akazara scallop troponins conferred the same extent of Ca 2+-sensitivity to rabbit reconstituted actomyosin Mg-ATPase activity, and the Ca 2+ concentration required for a half-maximal activation, with either troponin, was estimated as 1 μM. 3. 3. The ezo-giant scallop troponin consisted of three subunits of M r , 52,000, 40,000 and 20,000, and they were regarded as troponin-I, -T and -C, respectively, from the hybridization test with the akazara scallop troponin subunits which we previously identified [Ojima and Nashita (1988) J. Biochem. 104, 207–210].
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