||In some organisms, this enzyme is part of a multifunctional protein, together with one or more other components of the system for the biosynthesis of tryptophan [EC 18.104.22.168 (anthranilate phosphoribosyltransferase ), EC 22.214.171.124 (indole-3-glycerol-phosphate synthase), EC 126.96.36.199 (tryptophan synthase) and EC 188.8.131.52 (phosphoribosylanthranilate isomerase)]. The native enzyme in the complex uses either glutamine or, less efficiently, NH3. The enzyme separated from the complex uses NH3 only.
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