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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1978 Jul;75(7):3113–3117. doi: 10.1073/pnas.75.7.3113

Reconstitution of cholera toxin-activated adenylate cyclase.

G L Johnson, H R Kaslow, H R Bourne
PMCID: PMC392724  PMID: 277913

Abstract

Reconstitution of adenylate cyclase activity responsive to stimulation by guanylyl-5'imidodiphosphate or NaF may be achieved by mixing dilute Lubrol 12A9-solubilized extracts of wild-type S49 membranes with membranes of an adenylate cyclase-deficient variant. Experiments using N-ethylmaleimide to inactivate components of the adenylate cyclase system indicate that distinct components from both wild-type detergent extracts and adenylate cyclase-deficient membranes are essential for reconstitution. These results and conclusions confirm those of E. M. Ross and A. G. Gilman [J. Biol. Chem. (1977) 252, 6966-6969]. Detergent extracts of cholera toxin-treated wild-type membranes yield a reconstituted adenylate cyclase as responsive to GTP as to guanylyl-5'-imidodiphosphate whereas, in the absence of cholera toxin treatment, GTP has little or no effect. Cholera toxin-treated adenylate cyclase-deficient membranes and Lubrol 12A9 extracts from them, however, fail to yield a reconstituted adenylate cyclase that responds to GTP with an increase in cyclase activity. Because treatment of the adenylate cyclase-deficient variants with cholera toxin is without effect on the reconstituted cyclase, we propose that the cholera toxin substrate is absent or altered in the adenylate cyclase-deficient phenotype.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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