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Development, Vol 99, Issue 3 333-339, Copyright © 1987 by Company of Biologists

JOURNAL ARTICLES

Binding of zona pellucida proteins to a boar sperm polypeptide of Mr 53,000 and identification of zona moieties involved

CR Brown and R Jones
AFRC Institute of Animal Physiology & Genetics Research, Cambridge, UK.

Experiments have been carried out to identify proteins on boar spermatozoa that bind to components of the zona pellucida. Polypeptides in sodium deoxycholate extracts of boar spermatozoa and in whole seminal plasma have been separated by sodium dodecyl sulphate-polyacrylamide gel electrophoresis, transferred onto nitrocellulose sheet by electroblotting and probed with 125I-labelled heat-solubilized zona pellucida from pig oocytes or ovulated eggs. Zona proteins bound avidly and consistently to a polypeptide of Mr 53,000 on blots of capacitated and noncapacitated sperm and weakly to polypeptides of Mr 67,000, 38,000 and 18,000. On blots of seminal plasma the 125I-labelled probes bound to two polypeptides of Mr 65,000 and 19-24,000. Identification of the zona proteins that were binding to the aforementioned proteins on blots showed that all the major zona pellucida glycoproteins were involved, including those acquired from oviduct secretions. Binding of 125I-ovulated zona pellucida to the polypeptide of Mr 53,000 also occurred in extracts of testicular and epididymal boar spermatozoa. The results are discussed in relation to sperm-egg recognition in the pig.


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© The Company of Biologists Ltd 1987