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GAC has the highest activity in the presence of phosphate. (A) Kinetic analysis of the three isozymes shows that the apparent affinity for glutamine of KGA and GAC increases with higher concentrations of Pi, as opposed to what is observed for LGA, as suggested by their Km-app values. (B) Catalytic rates are increased, though at lower levels for KGA, as more phosphate is added to the reaction. (C) GAC becomes the most efficient isozyme already at concentrations of Pi around 10 mM.
