A ribonucleotide reductase gene is a transcriptional target of p53 and p73

Oncogene. 2000 Aug 31;19(37):4283-9. doi: 10.1038/sj.onc.1203774.


Many p53-inducible genes have been identified that might play a role in mediating the various downstream activities of p53. We have identified a close relative of ribonucleotide reductase, recently named p53R2, as a p53-inducible gene, and show that this gene is activated by several stress signals that activate a p53 response, including DNA damaging agents and p14(ARF). p53R2 expression was induced by p53 mutants that are defective for the activation of apoptosis, but retain cell cycle arrest function, although no induction of p53R2 was seen in response to p21(WAF1/CIP1)-mediated cell cycle arrest. Several isoforms of the p53 family member p73 were also shown to induce p53R2 expression. Transient ectopic expression of either wild type p53R2 or p53R2 targeted to the nucleus, did not significantly alter cell cycle progression in unstressed cells. The identification of this gene as a p53 target supports a direct role for p53 in DNA repair, in addition to inhibition of growth of damaged cells. Oncogene (2000) 19, 4283 - 4289

MeSH terms

  • Amino Acid Sequence
  • Cell Cycle Proteins*
  • Cell Line
  • DNA, Complementary / genetics
  • DNA-Binding Proteins / physiology*
  • Gene Expression Regulation*
  • Genes, Tumor Suppressor
  • Humans
  • Molecular Sequence Data
  • Nuclear Proteins / physiology*
  • RNA, Messenger / biosynthesis
  • RNA, Messenger / genetics
  • Ribonucleotide Reductases / biosynthesis
  • Ribonucleotide Reductases / genetics*
  • Transcription, Genetic*
  • Transfection
  • Tumor Protein p73
  • Tumor Suppressor Protein p53 / physiology*
  • Tumor Suppressor Proteins


  • Cell Cycle Proteins
  • DNA, Complementary
  • DNA-Binding Proteins
  • Nuclear Proteins
  • RNA, Messenger
  • TP73 protein, human
  • Tumor Protein p73
  • Tumor Suppressor Protein p53
  • Tumor Suppressor Proteins
  • RRM2B protein, human
  • Ribonucleotide Reductases