In mammals, the binding of the spermatozoon to the GalT initiates the acrosome reaction. This process releases the hyaluronidase that digests the matrix of hyaluronic acid in the vestments around the oocyte. Additionally, heparin-like glycosaminoglycans (GAGs) are released near the oocyte that promote the acrosome reaction. Fusion between the oocyte plasma membranes and sperm follows and allows the sperm nucleus, the typical centriole, and atypical centriole that is attached to the flagellum, but not the mitochondria, to enter the oocyte. The protein CD9 likely mediates this fusion in mice (the binding homolog). The egg "activates" itself upon fusing with a single sperm cell and thereby changes its cell membrane to prevent fusion with other sperm. Zinc atoms are released during this activation.
in mammals the binding of the spermatozoon to the galt initiates the acrosome reaction this process releases the hyaluronidase that digests the matrix of hyaluronic acid in the vestments around the oocyte additionally heparin-like glycosaminoglycans (gags) are released near the oocyte that promote the acrosome reaction fusion between the oocyte plasma membranes and sperm follows and allows the sperm nucleus the typical centriole and atypical centriole that is attached to the flagellum but not the mitochondria to enter the oocyte the protein cd9 likely mediates this fusion in mice (the binding homolog) the egg "activates" itself upon fusing with a single sperm cell and thereby changes its cell membrane to prevent fusion with other sperm zinc atoms are released during this activation