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  • Title: Sperm glycosidase as a plausible mediator of sperm binding to the vitelline envelope in Ascidians.
    Author: Hoshi M.
    Journal: Adv Exp Med Biol; 1986; 207():251-60. PubMed ID: 3825682.
    Abstract:
    In the Ascidian, Ciona intestinalis, sperm alpha-L-fucosidase is concluded to be a recognition protein for the sperm receptor in the vitelline envelope. The spermatozoa bind to the vitelline envelope probably by forming rather stable substrate (alpha-L-fucoside)-enzyme complex at many spots. Experimental evidence indicates a good correspondence in the properties between receptor binding activity and alpha-L-fucosidase activity such as the effects of saccharides, of pH and of monoclonal antibodies raised against sperm alpha-L-fucosidase, and locus in the sperm. A general mechanism involving an enzyme as a recognition protein for the cell to cell binding is also discussed in relation to the molecular evolution of the recognition proteins.
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