Summary
The effects of purified Ca2+, phospholipid-dependent protein kinase (C-kinase) were studied on adenylate cyclase activity from rat brain striatum. C-kinase treatment of the membranes stimulated adenylate cyclase activity, the maximal stimulation between 50–80% was observed at 3.5 U/ml, whereas the catalytic subunit of cAMP dependent protein kinase did not show any effect on enzyme activity. The inclusion of Ca2+ and phosphatidyl serine did not augment the percent stimulation of adenylate cyclase by C-kinase, however EGTA inhibited the stimulatory effect of C-kinase on enzyme activity. Furthermore, the known inhibitors of C-kinase such as polymyxin-B and 1-(5-Isoquinoline sulfonyl)-2-methylpiperazine dihydrochloride (H-7) also inhibited the stimulatory effect of C-kinase on adenylate cyclase activity. In addition, in the presence of GTP the stimulatory effects of C-kinase on basal and N-Ethylcarboxamide adenosine- (NECA-), dopamine-(DA) and forskolin- (FSK) sensitive adenylate cyclase activities were augmented. On the other hand, the inhibitory effect of high concentrations of GTP on enzyme activity was attenuated by C-kinase treatment. In addition, oxotremorine inhibited adenylate cyclase activity in a concentration dependent manner, with an apparent Ki of about 10 µM and C-kinase treatment almost completely abolished this inhibition. These data suggest that C-kinase may play an important role in the regulation of adenylate cyclase activity possibly by interacting with a guanine nucleotide regulatory protein.
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Abbreviations
- C-kinase:
-
Ca2− phospholipid-dependent protein kinase
- NECA:
-
N-Ethylcarboxamide adenosine
- DA:
-
Dopamine
- FSK:
-
Forskolin
- PMA:
-
Phorbol 12-(-Myristate), 13-Acetate, H-7, 1-(5-isoquinoline sulfonyl)-2-methylpiperazine dihydrochloride
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M.B.A.-S. was Canadian Heart Foundation Scholar during the course of these studies.
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Anand-Srivastava, M.B., Srivastava, A.K. Modulation of adenylate cyclase activity by Ca2+, phospholipid-dependent protein kinase in rat brain striatum. Mol Cell Biochem 92, 91–98 (1990). https://doi.org/10.1007/BF00220724
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DOI: https://doi.org/10.1007/BF00220724