Targeting mRNA to regulate iron and oxygen metabolism

Biochem Pharmacol. 2000 Jan 1;59(1):87-93. doi: 10.1016/s0006-2952(99)00300-7.

Abstract

A family of non-coding sequences in the mRNA (iso-IREs [iron-responsive elements]) regulate synthesis of key proteins in animal iron and oxidative metabolism such as ferritin and mitochondrial aconitase. Differential recognition between iso-IREs and iso-IRPs (iron regulatory proteins) regulates the translation or degradation of the IRE-containing mRNAs. IREs are hairpin loop structures with an internal loop/bulge or bulge that influence the binding of the iso-IRPs. The iso-IRPs have sequence homology to the aconitases and at least one IRP can be converted to an aconitase. Signals that target the iso-IRE/iso-IRP interactions in mRNA include environmental iron, O2, nitric oxide, H2O2, ascorbate, growth factors, and protein kinase C-dependent IRP phosphorylation. Iso-IRE structural specificity suggests a means of pharmacologically targeting mRNA function with chemicals such as Fe-bleomycin and other transition metal complexes that could be extended to other mRNAs with specific structures. With the iso-IRE/iso-IRP system, nature has evolved coordinated combinatorial control of iron and oxygen metabolism that may exemplify control of mRNAs in other metabolic pathways, viral reproduction, and oncogenesis.

Publication types

  • Review

MeSH terms

  • Animals
  • Gene Expression Regulation
  • Humans
  • Iron / metabolism*
  • Iron-Regulatory Proteins
  • Iron-Sulfur Proteins / metabolism
  • Models, Biological
  • Oxygen / metabolism*
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism*
  • RNA-Binding Proteins / metabolism

Substances

  • Iron-Regulatory Proteins
  • Iron-Sulfur Proteins
  • RNA, Messenger
  • RNA-Binding Proteins
  • Iron
  • Oxygen