Biochem Biophys Res Commun 1983 Nov 30;1171:147-53. doi: 10.1016/0006-291x(83)91553-x.

Structure and action of sperm activating peptides from the egg jelly of a sea urchin, Anthocidaris crassispina.

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Three Sperm Activating Peptides (SAPs) have been isolated to homogeneity from the jelly coat of the eggs of a Japanese sea urchin, Anthocidaris crassispina, and two of them have been sequenced. At pH 6.8 they can stimulate the sperm respiration 20-30 fold, to the level in normal seawater (pH 8.2), and the half-maximal activation was achieved by SAPs as low as around 100 pM. The stimulative activity was both pH- and Na+-dependent. The chymotryptic fragments (res. 3-10) were 10(4)-10(5) times less active, and the thermolytic fragment (res. 4-10) was 10(6) times less active than the parent SAP. CD spectra of SAPs indicate that they have unordered structure in aqueous solution.

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Genes referenced: LOC100887844