title: Solubilization of membrane-bound adenylate cyclase of isolated rat adrenal cortex cells.
abstract: The membrane-bound adenylase cyclase (ATP pyrosphosphate-lyase (cyclizing), EC 4.6.1.1) of isolated rat adrenal cortex cells can be rendered soluble using 0.02 M Lubrol 12A9. The solubilized enzyme can be filtered through Milipore filters with pores 0.22 micron in diameter. Using gel filtration, on Sephadex G-200, adenylate cyclase activity was eluted with a distribution coefficient of 0.139, whereas on Sephadex G-100 the activity was eluted in the excluded volume. Half-maximum activation of the postulated guanyl nucleotide regulator site of adenylate was achieved with 5'-guanylyl-imidodiphosphate at a concentration of 1 . 10(-6)M. In contrast, however, using intact isolated rat adrenal cortex cells the guanyl nucleotide regulator site could not be stimulated by 5'-guanylyl-imidodiphosphate.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000302:Adrenal Cortex / Q000201:enzymology*; D000324:Adrenocorticotropic Hormone / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002462:Cell Membrane / Q000201:enzymology*; D003902:Detergents / Q000494:pharmacology; D006165:Guanylyl Imidodiphosphate / Q000494:pharmacology; D051381:Rats; D012995:Solubility; D013696:Temperature; D013806:Theophylline / Q000494:pharmacology
chemical_list: D003902:Detergents; D006165:Guanylyl Imidodiphosphate; D000324:Adrenocorticotropic Hormone; D013806:Theophylline; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D000262:Adenylyl Cyclases; D002118:Calcium