Fertilization of the sea urchin egg results in the phosphorylation, on tyrosine, of a high molecular weight protein localized in the egg cortex. In the present study, treatment of unfertilized eggs with the phorbol ester 12-O-tetradecanoylphorbol 13-acetate stimulated tyrosine phosphorylation of the high molecular weight cortical protein to levels three- to fivefold higher than that occurring in response to fertilization. Experiments using agents that inhibit the egg Na+/H+ exchange system or mimic the fertilization-induced shift in cytoplasmic pHi, suggest a signal transduction pathway in which protein kinase C activates the egg Na+/H+ exchange system and the resultant cytoplasmic pHi shift promotes tyrosine phosphorylation of the high molecular weight cortical protein.
Phorbol ester treatment stimulates tyrosine phosphorylation of a sea urchin egg cortex protein.
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W P Jiang, R A Gottlieb, W J Lennarz, W H Kinsey; Phorbol ester treatment stimulates tyrosine phosphorylation of a sea urchin egg cortex protein.. J Cell Biol 1 April 1990; 110 (4): 1049–1053. doi: https://doi.org/10.1083/jcb.110.4.1049
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