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1. Halobacterium cutirubrum alkaline phosphatase is associated in crude extracts with a phosphodiesterase. 2. The enzymes were stabilized in buffers containing both (NH4)2SO4 and 10 mM-Mn2+. 3. Adsorption chromatography on Sepharose 6B/agarose-gel columns in the presence of 1.4M-(NH4)2SO4 gave a phosphatase-free phosphodiesterase and the alkaline phosphatase associated with some phosphodiesterase activity. 4. Further chromatography of the separated enzymes gave a good recovery of greater than 600-fold purified phosphodiesterase and greater than 3000-fold purified alkaline phosphatase. 5. The requirements of these enzymes and their relationship to each other was examined. 6. A detailed study showed that the alkaline phosphatase was adsorbed at least partially to agarose and dextran columns at all (NH4)2SO4 concentrations from 0.25 to 2M. 7. In contrast, no adsorption of the enzyme or protein standards was evident in 2.5M-KCl/l M-NaCl or 0.25 M-KCl/0.1 M-NaCl, in agreement with previous studies by Louis, Peterkin &amp; Fitt [(1971) Biochem. J. 121, 635-641], thus confirming the validity of gel filtration in 2.5 M-KCl/1 M-NaCl as a method for determining the approximate molecular weights of extremehalophile proteins.

Separation and purification of the alkaline phosphatase and a phosphodiesterase from Halobacterium cutirubrum