Enables amidophosphoribosyltransferase activity. Involved in purine ribonucleoside monophosphate biosynthetic process. Is expressed in several structures, including alimentary system; brain; liver; respiratory system; and urinary system. Orthologous to human PPAT (phosphoribosyl pyrophosphate amidotransferase). [provided by Alliance of Genome Resources, Apr 2022]