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“ EDTA leads to an increase in the Vmax for adenylate cyclase activity due to all of the following agents: isoproterenol , Gpp[NH]p, forskolin and Mg2+.”
“However, EDTA is associated with enhanced sensitivity to activation by isoproterenol and increased sensitivity to the effect of Mg2+ on isoproterenol-dependent adenylate cyclase activity.”
“Formation of this holocatalytic state was inhibited by conditions (4 degrees) or by compounds (e.g., GTP EDTA ) that prevented Gpp (NH) p binding or that prevented binding of isoproterenol (e.g., propranolol).”