Enables ferric iron binding activity and protein homodimerization activity. Contributes to ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor. Involved in deoxyribonucleotide biosynthetic process and protein heterotetramerization. Acts upstream of or within deoxyribonucleotide metabolic process. Part of ribonucleoside-diphosphate reductase complex. Is expressed in several structures, including alimentary system; brain; genitourinary system; limb; and sensory organ. Human ortholog(s) of this gene implicated in pancreatic cancer. Orthologous to human RRM2 (ribonucleotide reductase regulatory subunit M2). [provided by Alliance of Genome Resources, Apr 2022]