Enables several functions, including magnesium ion binding activity; purine ribonucleotide binding activity; and ribose phosphate diphosphokinase activity. Involved in 5-phosphoribose 1-diphosphate biosynthetic process; AMP biosynthetic process; and animal organ regeneration. Part of ribose phosphate diphosphokinase complex. Human ortholog(s) of this gene implicated in Arts syndrome; X-linked deafness 1; X-linked recessive disease (multiple); gout; and retinitis pigmentosa. Orthologous to human PRPS1 (phosphoribosyl pyrophosphate synthetase 1). [provided by Alliance of Genome Resources, Apr 2022]