title: Isoenzyme-specific phosphorylation of cytochromes P-450 and other drug metabolizing enzymes.
abstract: A series of fourteen cytochrome P-450 isoenzymes was treated with three different protein kinases and found to divide into isoenzymes phosphorylated by both the cyclic AMP-dependent kinase and the calcium-phospholipid-dependent kinase (P-450 PB 3a and PB 2e), by none of these kinases (P-450 PB 1b, MC 1b, UT 1, and thromboxane synthase), and by either the cyclic AMP-dependent kinase (P-450 LM 2, PB 2d, and PB 3b) or the calcium-phospholipid-dependent kinase (P-450 PB 1a, PB 2a, MC 1a, LM 3c, and LM 4). Other components of the monooxygenase system, cytochrome P-450 reductase, cytochrome b5, cytochrome b5 reductase as well as microsomal epoxide hydrolase, were poor substrates for the kinases employed. On the other hand, glutathione transferases 1-2 and 4-4, but not 3-3, were relatively good substrates for the calcium-phospholipid-dependent kinase.
mesh_terms: D000818:Animals; D047388:Casein Kinases; D000242:Cyclic AMP / Q000494:pharmacology; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D005982:Glutathione Transferase / Q000378:metabolism; D007527:Isoenzymes / Q000378:metabolism*; D004364:Pharmaceutical Preparations / Q000378:metabolism*; D010766:Phosphorylation; D011493:Protein Kinase C / Q000378:metabolism; D011494:Protein Kinases / Q000378:metabolism*; D011817:Rabbits; D051381:Rats; D013379:Substrate Specificity
chemical_list: D007527:Isoenzymes; D004364:Pharmaceutical Preparations; D003577:Cytochrome P-450 Enzyme System; D000242:Cyclic AMP; D005982:Glutathione Transferase; D011494:Protein Kinases; D047388:Casein Kinases; D011493:Protein Kinase C