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Since the initial observation that GTP reacted with a soluble protein factor(s), present in an ammonium chloride extract of E. coli ribosomes, to form a complex that was retained on a nitrocel- lulose filter (11), it has been shown that both transfer factors, Ts and Tu, are required to form the GTP complex (6,8).
Binding of one substrate molecule inhibits the binding of a second substrate. CTP is a known inhibitor of ATCase, the enzyme that catalyzes the first reaction in the pathway for the synthesis of this compound. the same molecule binding to different sites in the enzyme.