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• W2008713612 abstract "The sea urchin egg receptor for sperm is a 350 kDa glycoprotein containing a large extracellular domain that contains the sperm binding site, a transmembrane domain and a short COOH- terminal intracellular domain. During oogenesis, the receptor protein is first detected in Golgi-associated vesicles and cortical granules. Not until the egg is mature does the receptor appear on the cell surface; at this stage the intact receptor is found in approximately equal quantities on the egg cell surface and in cortical granules. As a potentially unique type of receptor, we were interested in its fate following fertilization. Several techniques have revealed that, following sperm binding, the amount of receptor markedly decreases. Using western blot analysis as well as direct measurement of the receptor protein, it was found that the membrane-bound form of the receptor rapidly disappeared following sperm binding to the egg, with only 3% of the receptor remaining after 30 s. Analysis by immupoelectron microscopy revealed that 30 s after sperm binding, 30% of the initial level of receptor was present. This remaining 30% was found mostly within the perivitelline space formed by the raised fertilization envelope. The disparity between these two sets of results (i.e. 3 vs 30%) is most likely accounted for by the exocytosis of receptor molecules from cortical granules; this fraction of the receptor would have been lost during isolation of the membrane-bound form of the receptor. Thus, unlike other cell surface receptors, the sea urchin egg receptor for sperm is not endocytosed and recycled following ligand binding. Rather, it disappears, presumably as a result of proteolysis. Transiently, the cortical granule form of the receptor is found released into the perivitelline space where it may bind to sperm and thereby prevent polyspermy. Despite the apparent secretion of this form of the receptor, experiments with antibodies to the extracellular and intracellular domains indicate that the receptors in cortical granules and in the plasmic membrane are similar, if not identical." @default.
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• W2008713612 date "1996-02-01" @default.
• W2008713612 modified "2023-09-27" @default.
• W2008713612 title "Fate of the sea urchin egg receptor for sperm following fertilization" @default.
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• W2008713612 doi "https://doi.org/10.1046/j.1440-169x.1996.00010.x" @default.
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