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- W2017812825 abstract "The three glycoproteins of pig zona pellucida (ZPA, ZPB and ZPC) can be separated into ZPA and a mixture of ZPB/ZPC by gel-filtration HPLC. We have shown previously that the neutral complex-type N-linked carbohydrate chains obtained from ZPB/ZPC possess sperm-binding activity. Intact ZPB and ZPC cannot be separated from each other unless acidic N-acetyllactosamine regions of their carbohydrate chains are removed by endo-β-galactosidase digestion. The endo-β-galactosidase−digested ZPB retains the sperm-binding activity. Recently, we have reported that N-linked carbohydrate chains of N-terminal fragment (residues 137−247) obtained from endo-β-galactosidase−digested ZPB are involved mainly in sperm binding [Yonezawa, N., Mitsui, S., Kudo, K. & Nakano, M. (1997) Eur. J. Biochem. 248, 86−92]. In this study, we separated the intact neutral N-linked chains from the ZPB/ZPC mixture into diantennary chains and triantennary and tetraantennary chains by affinity chromatography on Concanavalia ensiformis agglutinin. An in vitro competition assay revealed that triantennary and tetraantennary chains possess a sperm-binding activity stronger than that of diantennary chains. Three glycopeptides, having one Asn residue to which the carbohydrate chain is linked, were obtained by lysyl endopeptidase digestion of the heat-solubilized zonae containing intact ZPB and lysyl endopeptidase and chymotrypsin A digestion of endo-β-galactosidase−digested ZPB. From sugar-mapping analysis of the carbohydrate chains from these glycopeptides and comparison with the carbohydrate structures of the main intact neutral N-linked chains of ZPB/ZPC, the triantennary and tetraantennary chains were shown to be localized mainly at Asn220 of ZPB, and diantennary chains were present on all the three potential residues (Asn203, Asn220 and Asn333). These results suggest that the carbohydrate chains linked to Asn220 of ZPB participate predominantly in sperm-egg binding." @default.
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- W2017812825 date "1998-03-15" @default.
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- W2017812825 title "Localization of carbohydrate chains of pig sperm ligand in the glycoprotein ZPB of egg zona pellucida" @default.
- W2017812825 doi "https://doi.org/10.1046/j.1432-1327.1998.2520492.x" @default.
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