Botulinum ADP-ribosyltransferase C3 induces elevation of the vitelline coat of ascidian eggs |
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Authors: | S Toratani T Katada H Yokosawa |
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Affiliation: | Department of Biochemistry, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan. |
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Abstract: | Botulinum exoenzyme C3 ADP-ribosylates a 23 kDa protein of unfertilized eggs of the ascidian, Halocynthia roretzi. Microinjection of C3 into the eggs induced elevation of the egg vitelline coat. Co-injection of heparin or EGTA with C3 inhibited the inducing effect of C3. The vitelline coat of eggs which had been previously co-injected with heparin and C3 was elevated by addition of calcium ionophore, but not by insemination. C3 also induced an increased formation of inositol 1,4,5-triphosphate (IP3) in ascidian egg membranes. Thus the ADP-ribosylation of small GTP-binding protein by C3 seems to be responsible for elevation of the vitelline coat of ascidian eggs through IP3 formation and intracellular calcium mobilization. |
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