Salmine amino acid composition

Constitution of salmin. I. Amino acid composition, Ibid., 6, 419 (1945). With D. Bolling. 

Preparation and amino acid composition of salmin and clupein. Proc. Soc. Exptl. Biol. Med., 70, 494 (1949). With D. Bolling, H. Gershon, and H. A. Sober. 

CM-Sephadex C-25 as used earlier for clupeine, salmine, and iridine (Ando and Watanabe, 1969). The homogeneity of each fraction, after rechromatography, was confirmed by analysis of the amino-acid composition and the N-terminus, and by disc electrophoresis. 

Ando, T., Ishii, S., Yamasaki, M., Iwai, K., Hashimoto, C., Sawada, F. (3) Studies on protamines. I. Amino acid composition and homogeneity of clupeine, salmine and iridine. J. Biochem. (Tokyo) 44, 275—288 (1957). 

Velick, S. F., Udenfriend, S. The amino end-group and the amino acid composition of salmine. J. biol. Chem. 191, 233—238 (1951). 

Fish sperm contain nucleoprotamines. Upon treatment with sulfuric acid, the nucleoprotamines are reduced to nucleic acid and protamine sulfate. The chemically heterogeneous protamines of molar mass 2000-8000 thus obtained contain only a few different kinds of amino acid residues per molecule. They are relatively rich in basic amino acids, as the composition of the protamines clupeine and salmine shows (Table 29-6), and never contain cystine, aspartic acid, or tryptophan. The basic amino acids are responsible for the bonding of the protein to the nucleic acid component. 

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