Enables phosphoribosylamine-glycine ligase activity; phosphoribosylformylglycinamidine cyclo-ligase activity; and phosphoribosylglycinamide formyltransferase activity. Involved in several processes, including brain development; brainstem development; and tetrahydrofolate biosynthetic process. Predicted to be active in cytosol. Orthologous to human GART (phosphoribosylglycinamide formyltransferase, phosphoribosylglycinamide synthetase, phosphoribosylaminoimidazole synthetase). [provided by Alliance of Genome Resources, Apr 2022]