title: Microtubule-associated adenylate cyclase.
abstract: Twice-cycled bovine brain or rat brain microtubule protein contains an adenylate cyclase activity that passes 0.2 micron filters, is activated 2-7-fold by 30 microM forskolin, shows modest stimulation by fluoride (especially in the presence of added AI3+), but is virtually insensitive to added guanine nucleotides. The activity is insensitive to various hormones or Ca2+/calmodulin. The adenylate cyclase is active with both Mg2+ and Mn2+ but activity is less in the presence of Mg2+ than with Mn2+. The cyclase is inhibited by agonists of the adenosine P site. It is proposed that the catalytic unit of adenylate cyclase and probably small quantities of the guanine nucleotide regulatory protein, Ns, are cycled along with microtubules.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000201:enzymology; D002413:Cations, Divalent; D002417:Cattle; D005576:Colforsin; D004224:Diterpenes / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D005459:Fluorides / Q000494:pharmacology; D008869:Microtubule-Associated Proteins / Q000378:metabolism*; D008870:Microtubules / Q000201:enzymology*
chemical_list: D002413:Cations, Divalent; D004224:Diterpenes; D008869:Microtubule-Associated Proteins; D005576:Colforsin; D000262:Adenylyl Cyclases; D005459:Fluorides