Molecular cloning and characterization of P47, a novel boar sperm-associated zona pellucida-binding protein homologous to a family of mammalian secretory proteins

Biology of Reproduction
Michael A EnsslinE Töpfer-Petersen

Abstract

P47, a peripherally associated 47-kDa protein of porcine spermatozoa, was identified by affinity chromatography in the fraction of solubilized plasma membrane proteins bound to immobilized porcine zona pellucida glycoproteins. N-terminal and internal amino acid sequences revealed structural similarity between P47 and rat O-acetyl ganglioside synthase, bovine mammary gland protein (MGP)57/53 and mouse milk fat globule protein E8-polypeptides of unknown function secreted by mammary gland epithelial cells in both species. A polyclonal antibody directed against bovine MGP57/53 displayed cross-reactivity with P47. Indirect immunofluorescence analysis located porcine P47 on the acrosomal cap of testicular sperm and on sperm recovered along different sections of the ductus epididymidis, as well as on swim-up and in vitro-capacitated sperm. Porcine P47 was demonstrated on sperm bound to the zona pellucida of a homologous oocyte. Western blot analysis identified P47 (or MGP57/53) homologous proteins in porcine and human milk. Like the sperm-associated protein, porcine milk P47 possesses affinity for isolated, biotinylated sow oocyte zona pellucida glycoproteins. Reverse transcription-polymerase chain reaction was used to isolate P47 hom...Continue Reading

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