An enzyme, involved in the early steps of purine nucleotide biosynthesis, that catalyzes the formation of 5-phosphoribosylamine from glutamine and phosphoribosylpyrophosphate. EC 2.4.2.14.

Synonyms: Phosphoribosyldiphosphate 5-Amidotransferase, Pyrophosphate Amidotransferase, Phosphoribosyl, Amidotransferase, Phosphoribosyl Pyrophosphate, Glutamine-Amidophosphoribosyltransferase, 5-Phosphoribosylamine:pyrophosphate phospho-alpha-D-ribosyltransferase (glutamate-amidating), 5-Amidotransferase, Phosphoribosyldiphosphate, EC 2.4.2.14, Glutamine Amidophosphoribosyltransferase, Amidophosphoribosyltransferase, Glutamine Phosphoribosyl Pyrophosphate Amidotransferase, Phosphoribosyl Pyrophosphate Amidotransferase, Phosphoribosyldiphosphate 5 Amidotransferase