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- ArticlePilaski M, Voigt KD, Walter W.Biochim Biophys Acta. 1979 Feb 01;582(3):380-9.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.