Molecular cloning and characterization of an estrogen-dependent porcine oviductal secretory glycoprotein

Biology of Reproduction
W C BuhiF A Simmen

Abstract

A family of estrogen-dependent porcine oviductal secretory glycoproteins (POSPs) that exhibit structural similarities are synthesized and secreted into the oviductal lumen at proestrus, estrus, and metestrus. The objectives of this study were to clone the POSP cDNA, obtain the full-length cDNA and protein sequence, examine tissue specificity and species distribution, characterize its regulation, and establish its identity by comparison to other known protein, RNA, or DNA sequences. A full-length cDNA of 2022 base pairs was obtained with an open reading frame of 1581 nucleotides, coding for a deduced protein of 527 amino acids (57 970 M(r)). The deduced protein contained three potential N-glycosylation sites, a consensus heparin-binding site, and potential O-glycosylation sites. Amino acid analysis of POSP-E3 confirmed the presence of a 21-amino acid signal sequence. Northern blot analysis revealed an oviduct-specific mRNA species of 2.25 kb in the infundibulum (INF), ampulla (A), and isthmus (I). An mRNA of similar size was detected in the oviduct of the sheep, cow, and rabbit, and one of slightly greater size (2.8 kb) in the mouse and hamster oviduct but not in the horse or alligator oviduct. Dot blot analysis indicated that s...Continue Reading

Citations

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