title: Monoclonal antibodies as probes of the distribution of ZP-2, the major sulfated glycoprotein of the murine zona pellucida.
abstract: Three sulfated glycoproteins (ZP-1, ZP-2, and ZP-3) make up the zona pellucida, an extracellular glycocalyx that surrounds mouse oocytes. We have produced five monoclonal antibodies specific to the zona. All five immunoprecipitated ZP-2, and in addition, two of the antibodies immunoprecipitated ZP-3. This suggests the presence of either a common antigenic site or one made up in part by each of the two glycoproteins. The monoclonal antibodies bound to approximately 1.3 X 10(8) binding sites per ovulated mouse egg which represents 2% of the total number of ZP-2 molecules present in the zona. ZP-2 appeared to be present throughout the zona and indirect immunofluorescence revealed a fibrous pattern with no evidence of localization. Furthermore, this pattern of distribution, which was identical for all five monoclones, remained constant after fertilization at the two-cell embryo stage. Laser photobleaching demonstrated that ZP-2 is stably integrated in the extracellular matrix of the zona pellucida. No mouse tissue other than the ovary contained ZP-2 and ZP-2 is antigenically distinct from other previously described extracellular matrix proteins.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D004527:Egg Proteins; D005109:Extracellular Matrix / Q000648:ultrastructure; D005260:Female; D006023:Glycoproteins / Q000276:immunology / Q000378:metabolism*; D008562:Membrane Glycoproteins; D051379:Mice; D008970:Molecular Weight; D009865:Oocytes / Q000648:ultrastructure*; D010063:Ovum / Q000648:ultrastructure*; D011956:Receptors, Cell Surface; D015044:Zona Pellucida / Q000648:ultrastructure*; D000072216:Zona Pellucida Glycoproteins
chemical_list: D000911:Antibodies, Monoclonal; D004527:Egg Proteins; D006023:Glycoproteins; D008562:Membrane Glycoproteins; D011956:Receptors, Cell Surface; D000072216:Zona Pellucida Glycoproteins; C000606519:Zp1 protein, mouse; C000606520:Zp2 protein, mouse; C000606521:Zp3 protein, mouse