An enzyme that catalyzes the first step of the pathway for histidine biosynthesis in Salmonella typhimurium. ATP reacts reversibly with 5-phosphoribosyl-1-pyrophosphate to yield N-1-(5'-phosphoribosyl)-ATP and pyrophosphate. EC 2.4.2.17.

Synonyms: ATP Phosphoribosyltransferase, EC 2.4.2.17, Phosphoribosyltransferase, ATP, Pyrophosphorylase, Phosphoribosyl-ATP, Phosphoribosyl ATP Pyrophosphorylase, 1-(5-Phospho-D-ribosyl)-ATP:pyrophosphate phospho-alpha-D- ribosyltransferase, Phosphoribosyl-ATP Pyrophosphorylase