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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Iwai, K. Lavaute, T. Wehr, N. B. Weissman, A. M. Levine, R. L. Drake, S. K. Minato, N. Rouault, T. A. Klausner, R. D. |
| Description | Author Affiliation: Iwai K ( Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-5430, USA.); |
| Abstract | The ability of iron to catalyze formation of reactive oxygen species significantly contributes to its toxicity in cells and animals. Iron uptake and distribution is regulated tightly in mammalian cells, in part by iron regulatory protein 2 (IRP2), a protein that is degraded efficiently by the proteasome in iron-replete cells. Here, we demonstrate that IRP2 is oxidized and ubiquitinated in cells before degradation. Moreover, iron-dependent oxidation converts IRP2 into a substrate for ubiquitination in vitro. A regulatory pathway is described in which excess iron is sensed by its ability to catalyze site-specific oxidations in IRP2, oxidized IRP2 is ubiquitinated, and ubiquitinated IRP2 subsequently is degraded by the proteasome. Selective targeting and removal of oxidatively modified proteins may contribute to the turnover of many proteins that are degraded by the proteasome. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cysteine Endopeptidases Metabolism Iron-Sulfur Proteins Multienzyme Complexes RNA-Binding Proteins Animals COS Cells Cell-Free System Iron Regulatory Protein 2 Iron-Regulatory Proteins Oxidation-Reduction Proteasome Endopeptidase Complex Recombinant Proteins Ubiquitins Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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