title: Localization and structural characterization of an oligosaccharide O-linked to bovine PDC-109. Quantitation of the glycoprotein in seminal plasma and on the surface of ejaculated and capacitated spermatozoa.
abstract: PDC-109 (13 kDa) is the most abundant component, and the major heparin-binding protein, of bovine (Bos taurus) seminal plasma. Here, we show that PDC-109 contains a single O-linked oligosaccharide (NeuNAc alpha(2-6)-Gal beta(1-3)-GalNAc-) attached to Thr11. Immunoquantitation of PDC-109 indicates that its concentration in seminal plasma is 15-20 mg/ml. Though PDC-109 is not present on epididymal sperm, ejaculated spermatozoa on average are coated with (9.5 +/- 0.3) x 10(6) molecules of PDC-109/cell. This value remained constant in swim-up sperm and decreased to (7.7 +/- 0.4) x 10(6)/spermatozoon after incubation for 24 h in capacitation medium at 39 degrees C. These data substantiate the hypothesis that PDC-109 may be one of the seminal plasma components that enhance the fertilizing capacity of bull spermatozoa upon interaction with heparin-like glycosaminoglycans present in the female genital tract.
authors.affiliation: Institut für Reproduktionsmedizin, Tierärztliche Hochschule, Hannover, Germany.
authors.forename: J J
authors.initials: JJ
authors.lastname: Calvete
authors.forename: M
authors.initials: M
authors.lastname: Raida
authors.forename: L
authors.initials: L
authors.lastname: Sanz
authors.forename: F
authors.initials: F
authors.lastname: Wempe
authors.forename: K H
authors.initials: KH
authors.lastname: Scheit
authors.forename: A
authors.initials: A
authors.lastname: Romero
authors.forename: E
authors.initials: E
authors.lastname: Töpfer-Petersen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002240:Carbohydrate Sequence; D002417:Cattle; D008401:Gas Chromatography-Mass Spectrometry; D006023:Glycoproteins / Q000737:chemistry; D008297:Male; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry; D010446:Peptide Fragments / Q000737:chemistry; D029584:Prostatic Secretory Proteins; D011506:Proteins / Q000737:chemistry*; D012661:Semen / Q000737:chemistry; D029589:Seminal Plasma Proteins; D013094:Spermatozoa / Q000737:chemistry*
chemical_list: D006023:Glycoproteins; D009844:Oligosaccharides; D010446:Peptide Fragments; D029584:Prostatic Secretory Proteins; D011506:Proteins; D029589:Seminal Plasma Proteins; C043076:beta-microseminoprotein