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- W2079260303 abstract "Kinetic parameters of mouse thymocyte adenylate cyclase activity were determined. NaF and cholera toxin stimulated adenylate cyclase. Stimulation by either agent did not change the pH or Mg2+ optima relative to control (unstimulated cyclase). The Km value for ATP of adenylate cyclase stimulated by NaF was significantly reduced from control. By contrast, cholera toxin treatment did not change the Km relative to control. Adenylate cyclase, when stimulated by NaF, had an optimum for Mn2+ alone, or Mn2+ in combination with Mg2+, at least twice that of control. In contrast, cyclase activity prepared from cells treated with cholera toxin remained unchanged with regard to these divalent cations when compared to control. Addition of NaF to adenylate cyclase prepared from cells treated with cholera toxin resulted in a significant reduction (30%) in activity suggesting that both NaF and cholera toxin were acting on the same cyclase. NaF inhibition of cholera toxin-stimulated activity was shown to be a direct interaction of fluoride on the stimulated cyclase enzyme. This inhibition appeared to be immediate and independent on pH, Mg2+ or ATP concentrations. Although NaF inhibition was lost when Mn2+ was present in the reaction mixture, the activity expressed by addition of NaF to cyclase prepared from cholera toxin-treated cells was much less than by addition of NaF to control. As observed with cholera toxin stimulation alone, activity expressed by the inhibited enzyme (cholera toxin treated + NaF) exhibited a Km for ATP and an optimum for Mn2+ alone or in combination with Mg2+ similar to control." @default.
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- W2079260303 date "1976-02-24" @default.
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- W2079260303 title "Properties of cholera toxin- and NaF-stimulated adenylate cyclase from mouse thymocytes☆" @default.
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- W2079260303 doi "https://doi.org/10.1016/0304-4165(76)90290-7" @default.
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