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. 1996 Nov;16(11):6075–6082. doi: 10.1128/mcb.16.11.6075

Regulation of type I adenylyl cyclase by calmodulin kinase IV in vivo.

G A Wayman 1, J Wei 1, S Wong 1, D R Storm 1
PMCID: PMC231610  PMID: 8887637

Abstract

Type I adenylyl cyclase is a neurospecific enzyme that is stimulated by Ca2+ and calmodulin (CaM). This enzyme couples the Ca2+ and cyclic AMP (cAMP) regulatory systems in neurons, and it may play an important role for some forms of synaptic plasticity. Mutant mice lacking type I adenylyl cyclase show deficiencies in spatial memory and altered long-term potentiation (Z. Wu, S. A. Thomas, Z. Xia, E. C. Villacres, R. D. Palmiter, and D. R. Storm, Proc. Natl. Acad. Sci. USA 92:220-224, 1995). Although type I adenylyl cyclase is synergistically stimulated by Ca2+ and G-protein-coupled receptors in vivo, very little is known about mechanisms for inhibition of the enzyme. Here, we report that type I adenylyl cyclase is inhibited by CaM kinase IV in vivo. Expression of constitutively active or wild-type CaM kinase IV inhibited Ca2+ stimulation of adenylyl cyclase activity without affecting basal or forskolin-stimulated activity. Type I adenylyl cyclase has two CaM kinase IV consensus phosphorylation sequences near its CaM binding domain at Ser-545 and Ser-552. Conversion of either serine to alanine by mutagenesis abolished CaM kinase IV inhibition of adenylyl cyclase. This suggests that the activity of this enzyme may be directly inhibited by CaM kinase IV phosphorylation. Type VIII adenylyl cyclase, another enzyme stimulated by CaM, was not inhibited by CaM kinase II or IV. We propose that CaM kinase IV may function as a negative feedback regulator of type I adenylyl cyclase and that CaM kinases may regulate cAMP levels in some cells.

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Selected References

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