ArticleThe Journal of biological chemistry2011
Iron regulatory protein 2 turnover through a nonproteasomal pathway.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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Who cites it
5 citing papers in PubMed, 9 citations in OpenAlex.
- Mutation of a single cysteine in CaMKIIδ protects the heart from ischemia-reperfusion Injury.bioRxiv : the preprint server for biology · 2026Article
- Regulation of TRIB1 abundance in hepatocyte models in response to proteasome inhibition.Scientific reports · 2023Article
- Iron-responsive element-binding protein 2 plays an essential role in regulating prostate cancer cell growth.Oncotarget · 2017Article
- Regulation of ZAT12 protein stability: The role of hydrogen peroxide.Plant signaling & behavior · 2016Article
- Mammalian iron metabolism and its control by iron regulatory proteins.Biochimica et biophysica acta · 2012Review
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
Iron regulatory protein 2 (IRP2) controls the synthesis of many proteins involved in iron metabolism, and the level of IRP2 itself is regulated by varying the rate of its degradation. The proteasome is known to mediate degradation, with specificity conferred by an iron-sensing E3 ligase. Most studies on the degradation of IRP2 have employed cells overexpressing IRP2 and also rendered iron deficient to further increase IRP2 levels. We utilized a sensitive, quantitative assay for IRP2, which allowed study of endogenous IRP2 degradation in HEK293A cells under more physiologic conditions. We found that under these conditions, the proteasome plays only a minor role in the degradation of IRP2, with almost all the IRP2 being degraded by a nonproteasomal pathway. This new pathway is calcium-dependent but is not mediated by calpain. Elevating the cellular level of IRP2 by inducing iron deficiency or by transfection causes the proteasomal pathway to account for the major fraction of IRP2 degradation. We conclude that under physiological, iron-sufficient conditions, the steady-state level of IRP2 in HEK293A cells is regulated by the nonproteasomal pathway.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.