Predicted to enable several functions, including magnesium ion binding activity; purine ribonucleotide binding activity; and ribose phosphate diphosphokinase activity. Predicted to be involved in 5-phosphoribose 1-diphosphate biosynthetic process and AMP biosynthetic process. Predicted to act upstream of or within phosphorylation. Predicted to be part of ribose phosphate diphosphokinase complex. Predicted to be active in cytoplasm. Is expressed in alimentary system; central nervous system; and retina. Orthologous to human PRPS2 (phosphoribosyl pyrophosphate synthetase 2). [provided by Alliance of Genome Resources, Apr 2022]