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  • Title: Primary structure of scombrine gamma, protamine isolated from spotted mackerel (Scomber australasicus).
    Author: Okamoto Y, Ogawa K, Motohiro T, Nishi N, Muta E, Ota S.
    Journal: J Biochem; 1993 Jun; 113(6):658-64. PubMed ID: 8370660.
    Abstract:
    Spotted mackerel protamine, scombrine, was isolated from the sperm of a spotted mackerel (Scomber australasicus) by extraction with sulfuric acid and fractionated into one major (scombrine II) and one minor (scombrine I) components by chromatography on CM-Sephadex C-25. Scombrine II gave a single band, whereas scombrine I gave three bands upon PAGE. Scombrine II (scombrine gamma) consists of 34 amino acid residues, and its sequence is: Pro-Arg-Arg-Arg-Arg-Arg-Ala-Ser-Arg-Pro-Val-Arg-Arg-Arg-Arg-Arg- Ala-Arg-Arg-Ser-Thr-Ala-Val-Arg-Arg-Arg-Arg-Arg-Val-Val-Arg-Arg-Arg-Arg. The ion spray mass spectrum shows that scombrine gamma has a molecular mass of 4,532.13 Da. The other minor component (scombrine I) is considered to be a mixture of degradation products of scombrine gamma based on the results of PAGE and ion spray mass spectrometry. Scombrine gamma has a similar sequence to sardaine Z2 from striped bonito except for two positions.
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