title: Differentiation of fluorides-stimulated and non-fluoride-stimulated components of beef brain cortex adenylate cyclase cy calcium ions, ethyleneglycol-bis-(beta-aminoethyl ether) N,N'-tetraacetic acid and Triton X-100.
abstract: Beef brain cortex adenylate cyclase (ATP pyrophosphate-lyase (cyclizing) EC 4.6.1.1) activity is 84--88% inhibited by 5 - 10(-5) M ethyleneglycol-bis-(beta-aminoethyl ether)N,N'-tetraacetic acid in the absence of F- but only 50--60% inhibited by 5 - 10(-5) M ethyleneglycol-bis-(beta-aminoethyl ether)N,N'-tetraacetic acid in the presence of F-. In either case, further increase in EGTA concentration did not alter the degree of inhibition. The inhibition can be completely reversed in both cases by addition of 3 - 10(-5) M Ca2+, (yielding a [free Ca2+] of approximately 2 - 10(-6) M) and 5 - 10(-5) M Mn2+ or Co2+ and partially by 5 - 10(-5) M Sr2+ but not by addition of 5 - 10(-5) M Ba2+, Zn2+, Ni2+ or Fe2+. A [free Ca2+] of 7.2 - 10(-5) M markedly inhibited cyclase activity in the presence of F-. Solubilization by 1.8% Triton X-100 resulted in an enzyme preparation no longer stimulated by NaF and 100% inhibited by the addition of 5 - 10(-5) M ethyleneglycol-bis-(beta-aminoethyl ether)N,N'-tetraacetic acid either in the absence or presence of NaF. However, in contrast to ethyleneglycol-bis-(beta-aminoethyl ether)N,N'-TETRAACETIC ACID, EDTA had no measurable effect on adenylate cyclase either in the presence or absence of NaF and ethyleneglycol-bis-(beta-aminoethyl ether)N,N'-tetraacetic acid did not affect ATPase or phosphodiesterase activities. The data is rationalized by the postulation of two independent enzyme components in brain cortex: one component is about six-fold activated by NaF and the NaF effect is enhanced by low concentrations of Ca2+ and Mg2+. A second component is totally Ca2+ dependent and inhibited by high concentrations of F-. Mn2+, Co2+ and Sr2+ appear to be in vitro Ca2+ substitutes for both enzyme systems. On this basis, Triton X-100 treatment results in about a three-fold increase in specific activity of the Ca2+ dependent cyclase component but a complete abolition of the NaF stimulated component.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism; D000067956:Adenylyl Cyclase Inhibitors; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002417:Cattle; D002540:Cerebral Cortex / Q000201:enzymology*; D003035:Cobalt / Q000494:pharmacology; D004492:Edetic Acid / Q000494:pharmacology; D004533:Egtazic Acid / Q000494:pharmacology; D004789:Enzyme Activation; D005260:Female; D005459:Fluorides / Q000494:pharmacology*; D008345:Manganese / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000494:pharmacology
chemical_list: D000067956:Adenylyl Cyclase Inhibitors; D003035:Cobalt; D011092:Polyethylene Glycols; D008345:Manganese; D004533:Egtazic Acid; D004492:Edetic Acid; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D000251:Adenosine Triphosphatases; D000262:Adenylyl Cyclases; D005459:Fluorides; D002118:Calcium