Fish tropomyosin and fish nucleotropomyosin

Abstract

Two proteins showing the solubility properties of tropomyosin were isolated from fish muscle by salt extraction. Although the 2 compounds are indistinguishable by electrophoresis, they crystallize in different forms and behave very differently in the ultracentrifuge. These differences were related to their different mucleic acid contents. It is concluded that one compound is practically identical with Bailey''s tropomyosin and the other one is a combination of the same compound with pentose nucleic acid. The nucleoprotein can be split by heating in 5% (wt./vol.) trichloroacetic acid for 45 min.