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One step purification and biochemical characterization of a spermatozoa‐binding protein from porcine oviductal epithelial cells
Author(s) -
Marini Patricia E.,
Cabada Marcelo O.
Publication year - 2003
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.10361
Subject(s) - biology , oviduct , sperm , glycoprotein , biochemistry , lectin , serine , affinity chromatography , enzyme , microbiology and biotechnology , endocrinology , botany
In pigs the binding of sperm to oviductal epithelial cells to form a sperm reservoir involves carbohydrate interactions. In the present study, we purify a sperm binding glycoprotein (SBG) from cells from the isthmus of the oviduct using an affinity column. This protein conjugated with FITC is able to bind to the heads of pig sperm. SBG is shown to contain carbohydrates by PAS–silver staining and lectin binding assays. Enzymatic treatment and lectin affinity demonstrate that SBG exposes Galβ1‐3GalNAc disaccharide, which is bound to a serine or a threonin residue by an O‐link. After enzymatic deglycosylation SBG shows an apparent molecular mass of 67.5 kDa, which changes to 85 kDa by reduction with 2‐mercaptoethanol. Both SBG and enzymatically deglycosylated SBG show by isoelectrofocusing two forms of pI 3.6 and pI 3.8. SBG may be involved on sperm–oviduct interaction. Mol. Reprod. Dev. 66: 383–390, 2003. © 2003 Wiley‐Liss, Inc.