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J. Biochem, 1987, Vol. 101, No. 4 1017-1024
© 1987 Japanese Biochemical Society

other

Primary Structures of M6 and M7 of Mugiline ß (Mugil japonicus)

Yoshiko OKAMOTO, Eiko MUTA and Shoshi OTA

Department of Biochemistry, Daiichi College of Pharmaceutical Sciences Minami-ku, Fukuoka, Fukuoka 815

Mugiline ß isolated from mature sperm nuclei of the Formosan grey mullet, belonging to Perciformes, was fractionated into seven components (M1-M7), by chromatography on CM-Sephadex C-25. The amino acid sequences of the two major components (M6 and M7) were then determined. M6 contained 33 amino acid residues per molecule: Arg, 21; Thr, 1; Ser, 1; Glu, 1; Pro, 3; Ala, 2; Val, 2; Met, 0.3 and Ile, 1.7. The amino acid sequence of M6 is: Pro-Arg-Arg-Arg-Arg-Glu-Thr-Ser-Arg-Pro-Ile-Arg-Arg-Arg-Arg-Arg-Ala-Arg-Arg-Ala-Pro-Ile(Met)- Arg-Arg-Arg-Arg-Arg-Val-Val-Arg-Arg-Arg-Arg. Isoleucine at position 22 is partially replaced by methionine. M7 had an amino acid sequence similar to that of M6 except that glutamic acid at position 6 of M6 was replaced by glutamine. A high degree of homology in the sequences was found between mugiline ß from mullet and thynnine from tuna fish, which also belongs to Perciformes.


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