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IGPS Reaction. The T. maritima IGPS complex contains two enzyme subunits; HisH (blue), which catalyzes the hydrolysis of glutamine (the Gln analogue acivicin is shown in orange sticks) near a conserved catalytic triad (green spheres) and HisF (gray), which catalyzes the cleavage and cyclization of the allosteric activator and substrate PRFAR (purple sticks). The inverted arrow depicts the path of NH3 travel and key secondary structural elements of IGPS are labeled.
