Structural analysis of murine zona pellucida glycans. Evidence for the expression of core 2-type O-glycans and the Sd(a) antigen
| Autor: | R L, Easton, M S, Patankar, F A, Lattanzio, T H, Leaven, H R, Morris, G F, Clark, A, Dell |
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| Rok vydání: | 2000 |
| Předmět: |
Models
Molecular Glycoside Hydrolases Molecular Sequence Data Glycopeptides Neuraminidase Oligosaccharides Spectrometry Mass Fast Atom Bombardment beta-Galactosidase Methylation Gas Chromatography-Mass Spectrometry beta-N-Acetylhexosaminidases Mice Carbohydrate Sequence Models Chemical Polysaccharides alpha-Mannosidase Lectins Mannosidases Animals Female Sequence Analysis Zona Pellucida Protein Binding |
| Zdroj: | The Journal of biological chemistry. 275(11) |
| ISSN: | 0021-9258 |
| Popis: | Murine sperm initiate fertilization by binding to specific oligosaccharides linked to the zona pellucida, the specialized matrix coating the egg. Biophysical analyses have revealed the presence of both high mannose and complex-type N-glycans in murine zona pellucida. The predominant high mannose-type glycan had the composition Man(5)GlcNAc(2), but larger oligosaccharides of this type were also detected. Biantennary, triantennary, and tetraantennary complex-type N-glycans were found to be terminated with the following antennae: Galbeta1-4GlcNAc, NeuAcalpha2-3Galbeta1-4GlcNAc, NeuGcalpha2-3Galbeta1-4GlcNAc, the Sd(a) antigen (NeuAcalpha2-3[GalNAcbeta1-4]Galbeta1-4GlcNAc, NeuGcalpha2-3[GalNAcbeta1-4]Galbeta1-4GlcNAc), and terminal GlcNAc. Polylactosamine-type sequence was also detected on a subset of the antennae. Analysis of the O-glycans indicated that the majority were core 2-type (Galbeta1-4GlcNAcbeta1-6[Galbeta1-3]GalNAc). The beta1-6-linked branches attached to these O-glycans were terminated with the same sequences as the N-glycans, except for terminal GlcNAc. Glycans bearing Galbeta1-4GlcNAcbeta1-6 branches have previously been suggested to mediate initial murine gamete binding. Oligosaccharides terminated with GalNAcbeta1-4Gal have been implicated in the secondary binding interaction that occurs following the acrosome reaction. The significant implications of these observations are discussed. |
| Databáze: | OpenAIRE |
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