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Biochemical Studies on the Acrosome Reaction of the Starfish, Asterias Amurensis II. Purification and Characterization of Acrosome Reaction‐Inducing Substance
Author(s) -
IKADAI HIROYUKI,
HOSHI MOTONORI
Publication year - 1981
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1981.00081.x
Subject(s) - chromatography , starfish , chemistry , sephadex , biochemistry , galactosamine , glucosamine , biology , enzyme , ecology
The acrosome reaction‐inducing substance (ARIS) was purified from egg jelly of the starfish, Asterias amurensis. The purification procedure included elimination of neutral glycoproteins from the ARIS fraction by isoelectric pointprecipitation and subsequent gel filtrations on Sephadex G–50 and Bio‐Gel A‐50m columns. The final preparation of ARIS was homogeneous as judged by cellulose acetate electrophoresis of ARIS and by ion‐exchange chromatography on DEAE‐Sephadex A–25 of S‐carboxymethylated ARIS. ARIS is a very large, sulfated glycoprotein containing fucose, galactose, galactosamine and glucosamine as sugar components. It requires diffusible cofactor (Co‐ARIS) for full biological activity. A Pronase digest of ARIS retained its capacity to induce the acrosome reaction when Co‐ARIS was added to the bioassay system. The physiological significance of the carbohydrate moiety of ARIS is discussed.