Possible presence of O-linked carbohydrate in the human male reproductive tract CD52
Male reproductive tract CD52 (mrtCD52) is an antigen recognized by a complement-dependent sperm-immobilizing monoclonal antibody (SI-Abs) derived in an infertile patient. The molecule has been shown to contain a unique N-linked carbohydrate that does not cross-react with other tissues. In this study...
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Veröffentlicht in: | Journal of reproductive immunology 2004-06, Vol.62 (1-2), p.91-100 |
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Sprache: | eng |
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Zusammenfassung: | Male reproductive tract CD52 (mrtCD52) is an antigen recognized by a complement-dependent sperm-immobilizing monoclonal antibody (SI-Abs) derived in an infertile patient. The molecule has been shown to contain a unique N-linked carbohydrate that does not cross-react with other tissues. In this study, we have investigated whether O-linked carbohydrate as well as N-linked carbohydrate is present in mrtCD52 using specific lectins and anti-CD52 core peptide antiserum. The lectin PNA, which recognizes O-linked carbohydrate [Galβ1−3GalNAc], reacted with mrtCD52 and showed a similar polymorphic reaction pattern to that of the anti-peptide antiserum in western blotting analysis on two-dimensional SDS–PAGE. The PNA-reactive spots disappeared after removal of O-linked carbohydrate, but not after removal of N-linked carbohydrate. These results suggest that O-linked carbohydrate is present in mrtCD52. The moiety may possibly contribute to a specific antigenic epitope of mrtCD52. |
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ISSN: | 0165-0378 1872-7603 |
DOI: | 10.1016/j.jri.2003.12.004 |