title: K-252 compounds, novel and potent inhibitors of protein kinase C and cyclic nucleotide-dependent protein kinases.
abstract: K-252 compounds (K-252a and b isolated from Nocardiopsis sp. (1) and their synthetic derivatives) were found to inhibit cyclic nucleotide-dependent protein kinases and protein kinase C to various extents. The inhibitions were of the competitive type with respect to ATP. K-252a was a non-selective inhibitor for these three protein kinases with Ki values 18-25 nM. K-252b showed a comparable potency for protein kinase C (Ki, 20nM), whereas inhibitory potencies for cyclic nucleotide-dependent protein kinases were reduced. KT5720 and KT5822 selectively inhibited cAMP-dependent (Ki, 60nM) and cGMP-dependent (Ki, 2.4nM) protein kinases, respectively.
mesh_terms: D000255:Adenosine Triphosphate / Q000494:pharmacology; D002227:Carbazoles / Q000494:pharmacology*; D006152:Cyclic GMP / Q000494:pharmacology; D026121:Indole Alkaloids; D011493:Protein Kinase C / Q000037:antagonists & inhibitors*; D047428:Protein Kinase Inhibitors; D013329:Structure-Activity Relationship
chemical_list: D002227:Carbazoles; D026121:Indole Alkaloids; D047428:Protein Kinase Inhibitors; D000255:Adenosine Triphosphate; C049985:staurosporine aglycone; D011493:Protein Kinase C; D006152:Cyclic GMP