Abstract
Tropomyosin preparations from obliquely striated mantle muscle of squid were obtained from low ionic strength extracts of natural actomyosin and their physico-chemical properties were studied. The sedimentation coefficient, 3.0 S, and the intrinsic viscosity, 0.31dl/g, of squid tropomyosin were very similar to those of skeletal tropomyosin. The relative viscosity decreased with increasing ionic strength, becoming constant over 0.1 M KCl. The molecular weight of the squid tropomyosin subunits, 3.5 × and 3.7 × 104, obtained by SDS disc electrophoresis was slightly higher than those of other species. There are some differences between squid and vertebrates in the contents of some amino acids, such as Pro, Trp and Arg. Moreover, the squid tropomyosin was poorer than the skeletal and the non-muscle tropomyosins in easily forming the paracrystals and did not form any crystals.
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