Characterization of [3H]staurosporine binding in protein kinase C-II purified from rat brain.
The type II protein kinase C (PKC-II) densely present in mammalian brain plays functional roles in CNS. We examined the characteristics of [3H]staurosporine binding to PKC-II purified from rat brain, compared to [3H]phorbol 12, 13-dibutyrate (PDBu) binding. In brief, [3H]staurosporine binding increased by phosphatidylserine (PtdSer) in a concentration-dependent manner and the binding was enhanced by Ca2+ and phorbol 12-myristate 13-acetate (PMA). In the presence of Ca2+, PMA and PtdSer, Bmax of these bindings markedly increased, but KD did not change. These characteristics of binding were similar to [3H]PDBu binding to PKC-II. Although [3H]PDBu binding was not affected by protein kinase inhibitors such as staurosporine, H-7, K-252a and K-252b, [3H]staurosporine binding was inhibited by these inhibitors. [3H]staurosporine binding was inhibited by several ATP analogues, but was not by guanine nucleotides. PtdSer-induced increase in [3H]PDBu binding was inhibited by Zn2+, but Zn2+ induced increase in [3H]staurosporine binding as well as PtdSer and/or Ca2+. Staurosporine would thus appear to bind to a domain different from phorbol ester-binding one in PKC, interactions between both domains may regulate kinase activity, and 1 mol staurosporine and 4 mol phorbol ester may bind to 1 mol PKC-II.
Miyazaki
A
A
Department of Pharmacology, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.
Kitamura
Y
Y
Nomura
Y
Y
D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000227:Adenine Nucleotides / Q000494:pharmacology; D000470:Alkaloids / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000201:enzymology*; D002118:Calcium / Q000494:pharmacology; D002227:Carbazoles / Q000494:pharmacology; D006150:Guanine Nucleotides / Q000494:pharmacology; D026121:Indole Alkaloids; D007546:Isoquinolines / Q000494:pharmacology; D015240:Phorbol 12,13-Dibutyrate / Q000378:metabolism; D010718:Phosphatidylserines / Q000494:pharmacology; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D019311:Staurosporine; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D015032:Zinc / Q000494:pharmacology
D000227:Adenine Nucleotides; D000470:Alkaloids; D002227:Carbazoles; D006150:Guanine Nucleotides; D026121:Indole Alkaloids; D007546:Isoquinolines; D010718:Phosphatidylserines; D010879:Piperazines; D015240:Phorbol 12,13-Dibutyrate; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; C049985:staurosporine aglycone; D011493:Protein Kinase C; D019311:Staurosporine; D015032:Zinc; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium