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The native myosin and paramyosin extracted from the ordinary muscle of yellowtail (Seriola quinqueradita) and the adductor muscle of whelk (Neptunea artlzritica comingi) were studied for their physico-chemical characteristics. Molecular weight, molar extinction coefficient at 278 ㎚ and intrinsic viscosity were accounted for 4.6 × 10^5 dalton, 5.44 in E^(1㎝)_(1%) and 1.60 ㎗/g in yellowtail myosin, and 2.0 × 10^5 dalton, 3.04 in E^(1㎝)_(1%) and 2.60 ㎗/g in whelk paramyosin, respectively. Yellowtail myosin showed a 0.342μmole-Pi/min/㎎-protein of Ca^(2+)-ATPase activity and contained 40 group-SH/mole-myosin. The ratio of polar amino acids to non-polar amino acids and that of acidic amino acids to basic amino acids were 0.54 and 1.64 in yellowtail moysin, and were 0.47 and 2.42 in whelk paramyosin, respectively.
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