Histidine Biosynthesis (early stages)

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ribose activation.
histidine biosynthesis (late stages).
EC 2.4.2.7 adenine phosphoribosyltransferase
EC 2.4.2.17 ATP phosphoribosyltransferase
EC 3.5.4.19 phosphoribosyl-AMP cyclohydrolase
EC 3.6.1.31 phosphoribosyl-ATP diphosphatase
EC 5.3.1.16 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino)imidazole-4-carboxamide isomerase