Murine sperm-zona binding, a fucosyl residue is required for a high affinity sperm-binding ligand. A second site on sperm binds a nonfucosylated, beta-galactosyl-capped oligosaccharide.

The Journal of Biological Chemistry
D S JohnstonD H Joziasse

Abstract

An essential initial step in murine fertilization is the binding of acrosome-intact sperm to specific O-linked oligosaccharides on zona pellucida glycoprotein 3. While there is agreement on the primary role of O-linked glycans in this process, there is a lack of consensus on both the terminal monosaccharide(s) required for a functional sperm binding site and the corresponding protein on the sperm cell surface that recognizes this ligand. Much current debate centers on an essential role for either a terminal N-acetylglucosaminyl or, alternatively, a terminal alpha-galactosyl residue. To gain insight into the terminal saccharides required to form a functional sperm-binding ligand, dose-response curves were generated for a series of related tri- and tetrasaccharides to evaluate their relative effectiveness to competitively inhibit the in vitro binding of murine sperm to zona pellucida-enclosed eggs. A GlcNAc-capped trisaccharide, GlcNAc beta 1,4GlcNAc beta 1,4GlcNAc,was inactive (1-72 microM range). In contrast, a beta 4-galactosyl-capped trisaccharide (Gal beta 1,4GlcNAc beta 1, 4GlcNAc) and an alpha 3-galactosyl-capped trisaccharide (Gal alpha 1,3Gal beta 1,4 GlcNAc) inhibited sperm-zona binding with low or moderate affinity (ED...Continue Reading

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