Physicochemical Characteristics of Yellowtail Myosin and Whelk Paramyosin

The native myosin and paramyosin extracted from the ordinary muscle of yellowtail (Seriola quinqueradita) and the adductor muscle of whelk (Neptunea arthritica cumingi) were studied for their physico-chemical characteristics. Molecular weight, molar extinction coefficient at 278 nm and intrinsic viscosity were accounted for dalton, 5.44 in and 1.60 dl/g in yellowtail myosin, and dalton, 3.04 in and 2.60 dl/g in whelk paramyosin, respectively. Yellowtail myosin showed a of 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.