1
|
Lines CL, McGrath MJ, Dorwart T, Conn CS. The integrated stress response in cancer progression: a force for plasticity and resistance. Front Oncol 2023; 13:1206561. [PMID: 37601686 PMCID: PMC10435748 DOI: 10.3389/fonc.2023.1206561] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 06/07/2023] [Indexed: 08/22/2023] Open
Abstract
During their quest for growth, adaptation, and survival, cancer cells create a favorable environment through the manipulation of normal cellular mechanisms. They increase anabolic processes, including protein synthesis, to facilitate uncontrolled proliferation and deplete the tumor microenvironment of resources. As a dynamic adaptation to the self-imposed oncogenic stress, cancer cells promptly hijack translational control to alter gene expression. Rewiring the cellular proteome shifts the phenotypic balance between growth and adaptation to promote therapeutic resistance and cancer cell survival. The integrated stress response (ISR) is a key translational program activated by oncogenic stress that is utilized to fine-tune protein synthesis and adjust to environmental barriers. Here, we focus on the role of ISR signaling for driving cancer progression. We highlight mechanisms of regulation for distinct mRNA translation downstream of the ISR, expand on oncogenic signaling utilizing the ISR in response to environmental stresses, and pinpoint the impact this has for cancer cell plasticity during resistance to therapy. There is an ongoing need for innovative drug targets in cancer treatment, and modulating ISR activity may provide a unique avenue for clinical benefit.
Collapse
Affiliation(s)
| | | | | | - Crystal S. Conn
- Department of Radiation Oncology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, United States
| |
Collapse
|
2
|
Andrysik Z, Sullivan KD, Kieft JS, Espinosa JM. PPM1D suppresses p53-dependent transactivation and cell death by inhibiting the Integrated Stress Response. Nat Commun 2022; 13:7400. [PMID: 36456590 PMCID: PMC9715646 DOI: 10.1038/s41467-022-35089-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 11/17/2022] [Indexed: 12/03/2022] Open
Abstract
The p53 transcription factor is a master regulator of cellular stress responses inhibited by repressors such as MDM2 and the phosphatase PPM1D. Activation of p53 with pharmacological inhibitors of its repressors is being tested in clinical trials for cancer therapy, but efficacy has been limited by poor induction of tumor cell death. We demonstrate that dual inhibition of MDM2 and PPM1D induces apoptosis in multiple cancer cell types via amplification of the p53 transcriptional program through the eIF2α-ATF4 pathway. PPM1D inhibition induces phosphorylation of eIF2α, ATF4 accumulation, and ATF4-dependent enhancement of p53-dependent transactivation upon MDM2 inhibition. Dual inhibition of p53 repressors depletes heme and induces HRI-dependent eIF2α phosphorylation. Pharmacological induction of eIF2α phosphorylation synergizes with MDM2 inhibition to induce cell death and halt tumor growth in mice. These results demonstrate that PPM1D inhibits both the p53 network and the integrated stress response controlled by eIF2α-ATF4, with clear therapeutic implications.
Collapse
Affiliation(s)
- Zdenek Andrysik
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
| | - Kelly D Sullivan
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
- Department of Pediatrics, Section of Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Jeffrey S Kieft
- Department of Biochemistry and Molecular Genetics and RNA Bioscience Initiative, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Joaquin M Espinosa
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
| |
Collapse
|
3
|
Yerlikaya A. Heme-regulated inhibitor: an overlooked eIF2α kinase in cancer investigations. Med Oncol 2022; 39:73. [PMID: 35568791 DOI: 10.1007/s12032-022-01668-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 01/24/2022] [Indexed: 10/18/2022]
Abstract
Heme-regulated inhibitor (HRI) kinase is a serine-threonine kinase, controlling the initiation of protein synthesis via phosphorylating α subunit of eIF2 on serine 51 residue, mainly in response to heme deprivation in erythroid cells. However, recent studies showed that HRI is also activated by several diverse signals, causing dysregulations in intracellular homeostatic mechanisms in non-erythroid cells. For instance, it was reported that the decrease in protein synthesis upon the 26S proteasomal inhibition by MG132 or bortezomib is mediated by increased eIF2α phosphorylation in an HRI-dependent manner in mouse embryonic fibroblast cells. The increase in eIF2α phosphorylation level through the activation of HRI upon 26S proteasomal inhibition is believed to protect cells against the buildup of misfolded and ubiquitinated proteins, having the potential to trigger the apoptotic response. In contrast, prolonged and sustained HRI-mediated eIF2α phosphorylation can induce cell death, which may involve ATF4 and CHOP expression. Altogether, these studies suggest that HRI-mediated eIF2α phosphorylation may be cytoprotective or cytotoxic depending on the cells, type, and duration of pharmacological agents used. It is thus hypothesized that both HRI activators, inducing eIF2α phosphorylation or HRI inhibitors causing disturbances in eIF2α phosphorylation, may be effective as novel strategies in cancer treatment if the balance in eIF2α phosphorylation is shifted in favor of autophagic or apoptotic response in cancer cells. It is here aimed to review the role of HRI in various biological mechanisms as well as the therapeutic potentials of recently developed HRI activators and inhibitors, targeting eIF2α phosphorylation in cancer cells.
Collapse
Affiliation(s)
- Azmi Yerlikaya
- Department of Medical Biology, Faculty of Medicine, Kutahya Health Sciences University, Kutahya, Turkey.
| |
Collapse
|
4
|
Activation of HRI is mediated by Hsp90 during stress through modulation of the HRI-Hsp90 complex. Int J Biol Macromol 2018; 118:1604-1613. [PMID: 30170366 DOI: 10.1016/j.ijbiomac.2018.06.204] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/28/2018] [Accepted: 06/30/2018] [Indexed: 12/28/2022]
Abstract
Heme Regulated Inhibitor (HRI) is known to get activated in various stresses such as heme deficiency, heat shock, heavy metal toxicity etc. Heat shock protein 90 (Hsp90), a ubiquitous cytoplasmic protein interacts with HRI in order to regulate protein synthesis. However, it still remains to establish this interaction of HRI and Hsp90 at cellular levels and how this modulation of HRI activity is mediated by Hsp90 during stress. In the present report, using co-immunoprecipitation analysis we show that HRI interacts with Hsp90 and this association is independent of other co-chaperones in in vitro conditions. Further, analysis using truncated domains of HRI revealed that the K1 subdomain is essential for HRI - Hsp90 complex formation. Our in silico protein - protein interaction studies also indicated interaction of Hsp90 with K1 subdomain of HRI. Mammalian two hybrid assay validated this HRI - Hsp90 interaction at cellular levels. When the in vitro kinase assay was carried out with the co-immunoprecipitated complex of HRI - Hsp90, an increase in the kinase activity was observed resulting elevated levels of eIF2α phosphorylation upon heavy metal stress and heat shock. Thus, our results clearly indicate modulation of HRI kinase activity with simultaneous Hsp90 association under stress conditions.
Collapse
|
5
|
The eIF2α Kinase Heme-Regulated Inhibitor Protects the Host from Infection by Regulating Intracellular Pathogen Trafficking. Infect Immun 2018; 86:IAI.00707-17. [PMID: 29311243 DOI: 10.1128/iai.00707-17] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 12/19/2017] [Indexed: 12/20/2022] Open
Abstract
The host employs both cell-autonomous and system-level responses to limit pathogen replication in the initial stages of infection. Previously, we reported that the eukaryotic initiation factor 2α (eIF2α) kinases heme-regulated inhibitor (HRI) and protein kinase R (PKR) control distinct cellular and immune-related activities in response to diverse bacterial pathogens. Specifically for Listeria monocytogenes, there was reduced translocation of the pathogen to the cytosolic compartment in HRI-deficient cells and consequently reduced loading of pathogen-derived antigens on major histocompatibility complex class I (MHC-I) complexes. Here we show that Hri-/- mice, as well as wild-type mice treated with an HRI inhibitor, are more susceptible to listeriosis. In the first few hours of L. monocytogenes infection, there was much greater pathogen proliferation in the liver of Hri-/- mice than in the liver of Hri+/+ mice. Further, there was a rapid increase of serum interleukin-6 (IL-6) levels in Hri+/+ mice in the first few hours of infection whereas the increase in IL-6 levels in Hri-/- mice was notably delayed. Consistent with these in vivo findings, the rate of listeriolysin O (LLO)-dependent pathogen efflux from infected Hri-/- macrophages and fibroblasts was significantly higher than the rate seen with infected Hri+/+ cells. Treatment of cells with an eIF2α kinase activator enhanced both the HRI-dependent and PKR-dependent infection phenotypes, further indicating the pharmacologically malleability of this signaling pathway. Collectively, these results suggest that HRI mediates the cellular confinement and killing of virulent L. monocytogenes in addition to promoting a system-level cytokine response and that both are required to limit pathogen replication during the first few hours of infection.
Collapse
|
6
|
Ogura M, Endo R, Ishikawa H, Takeda Y, Uchida T, Iwai K, Kobayashi K, Ishimori K. Redox-dependent axial ligand replacement and its functional significance in heme-bound iron regulatory proteins. J Inorg Biochem 2018; 182:238-248. [PMID: 29449016 DOI: 10.1016/j.jinorgbio.2018.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/07/2017] [Accepted: 01/08/2018] [Indexed: 11/29/2022]
Abstract
Iron regulatory proteins (IRPs), regulators of iron metabolism in mammalian cells, control the translation of proteins involved in iron uptake, storage and utilization by binding to specific iron-responsive element (IRE) sequences of mRNAs. Two homologs of IRPs (IRP1 and IRP2) have a typical heme regulatory motif (HRM), a consensus sequence found in "heme-regulated proteins". However, specific heme binding to HRM has been reported only for IRP2, which is essential for oxidative modification and loss of binding to target mRNAs. In this paper, we confirmed that IRP1 also specifically binds two molar equivalents of heme, and found that the absorption and resonance Raman spectra of heme-bound IRP1 were quite similar to those of heme-bound IRP2. This shows that the heme environmental structures in IRP1 are close to those of proteins using heme as a regulatory molecule. Pulse radiolysis experiments, however, clearly revealed an axial ligand exchange from Cys to His immediately after the reduction of the heme iron to form a 5-coordinate His-ligated heme in heme-bound IRP2, whereas the 5-coordinate His-ligated heme was not observed after the reduction of heme-bound IRP1. Considering that the oxidative modification is only observed in heme-bound IRP2, but not IRP1, probably owing to the structural flexibility of IRP2, we propose that the transient 5-coordinate His-ligated heme is a prerequisite for oxidative modification of heme-bound IRP2, which functionally differentiates heme binding of IRP2 from that of IRP1.
Collapse
Affiliation(s)
- Mariko Ogura
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Ryosuke Endo
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8530, Japan
| | - Haruto Ishikawa
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8530, Japan
| | - Yukiko Takeda
- Molecular and Cellular Physiology, Graduate School of Medicine, Kyoto University, Kyoto 606-8561, Japan
| | - Takeshi Uchida
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan; Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Kazuhiro Iwai
- Molecular and Cellular Physiology, Graduate School of Medicine, Kyoto University, Kyoto 606-8561, Japan
| | - Kazuo Kobayashi
- The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Koichiro Ishimori
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan; Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan.
| |
Collapse
|
7
|
Wang X, Yennawar N, Hankey PA. Autoinhibition of the Ron receptor tyrosine kinase by the juxtamembrane domain. Cell Commun Signal 2014; 12:28. [PMID: 24739671 PMCID: PMC4021555 DOI: 10.1186/1478-811x-12-28] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 02/05/2014] [Indexed: 01/21/2023] Open
Abstract
Background The Ron receptor tyrosine kinase (RTK) has been implicated in the progression of a number of carcinomas, thus understanding the regulatory mechanisms governing its activity is of potential therapeutic significance. A critical role for the juxtamembrane domain in regulating RTK activity is emerging, however the mechanism by which this regulation occurs varies considerably from receptor to receptor. Results Unlike other RTKs described to date, tyrosines in the juxtamembrane domain of Ron are inconsequential for receptor activation. Rather, we have identified an acidic region in the juxtamembrane domain of Ron that plays a central role in promoting receptor autoinhibition. Furthermore, our studies demonstrate that phosphorylation of Y1198 in the kinase domain promotes Ron activation, likely by relieving the inhibitory constraints imposed by the juxtamembrane domain. Conclusions Taken together, our experimental data and molecular modeling provide a better understanding of the mechanisms governing Ron activation, which will lay the groundwork for the development of novel therapeutic approaches for targeting Ron in human malignancies.
Collapse
Affiliation(s)
| | | | - Pamela A Hankey
- Graduate Program in Cell and Developmental Biology, The Pennsylvania State University, University Park, PA 16802, USA.
| |
Collapse
|
8
|
Modulation of hepcidin as therapy for primary and secondary iron overload disorders: preclinical models and approaches. Hematol Oncol Clin North Am 2014; 28:387-401. [PMID: 24589273 DOI: 10.1016/j.hoc.2013.11.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this article, the authors discuss new approaches to treating iron overload diseases using hepcidin mimetics or by modulating endogenous hepcidin expression. In particular, the authors discuss lipid nanoparticle encapsulated siRNA and antisense oligonucleotide-mediated inhibition of TMPRSS6, an upstream regulator of hepcidin, and treatment with transferrin or hepcidin mimetics, including the recently described minihepcidins. In each case, in animal models of β-thalassemia, not only do the interventions affect iron absorption but they also act as disease-modifying agents that ameliorate the ineffective erythropoiesis.
Collapse
|
9
|
Tong L, Heim RA, Wu S. Nitric oxide: a regulator of eukaryotic initiation factor 2 kinases. Free Radic Biol Med 2011; 50:1717-25. [PMID: 21463677 PMCID: PMC3096732 DOI: 10.1016/j.freeradbiomed.2011.03.032] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 03/24/2011] [Accepted: 03/26/2011] [Indexed: 12/18/2022]
Abstract
Generation of nitric oxide (NO(•)) can upstream induce and downstream mediate the kinases that phosphorylate the α subunit of eukaryotic initiation factor 2 (eIF2α), which plays a critical role in regulating gene expression. There are four known eIF2α kinases (EIF2AKs), and NO(•) affects each one uniquely. Whereas NO(•) directly activates EIF2AK1 (HRI), it indirectly activates EIF2AK3 (PERK). EIF2AK4 (GCN2) is activated by depletion of l-arginine, which is used by nitric oxide synthase (NOS) during the production of NO(•). Finally EIF2AK2 (PKR), which can mediate inducible NOS expression and therefore NO(•) production, can also be activated by NO(•). The production of NO(•) and activation of EIF2AKs coordinately regulate physiological and pathological events such as innate immune response and cell apoptosis.
Collapse
Affiliation(s)
| | | | - Shiyong Wu
- Address correspondence to: Dr. Shiyong Wu, Edison Biotechnology Institute, 101 Konneker Laboratories, The Ridges, Building 25, Athens, OH 45701, Tel. (740) 597-1318, Fax (740) 593-4795;
| |
Collapse
|
10
|
Mahoney SJ, Dempsey JM, Blenis J. Cell signaling in protein synthesis ribosome biogenesis and translation initiation and elongation. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2009; 90:53-107. [PMID: 20374739 DOI: 10.1016/s1877-1173(09)90002-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Protein synthesis is a highly energy-consuming process that must be tightly regulated. Signal transduction cascades respond to extracellular and intracellular cues to phosphorylate proteins involved in ribosomal biogenesis and translation initiation and elongation. These phosphorylation events regulate the timing and rate of translation of both specific and total mRNAs. Alterations in this regulation can result in dysfunction and disease. While many signaling pathways intersect to control protein synthesis, the mTOR and MAPK pathways appear to be key players. This chapter briefly reviews the mTOR and MAPK pathways and then focuses on individual phosphorylation events that directly control ribosome biogenesis and translation.
Collapse
Affiliation(s)
- Sarah J Mahoney
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | | | | |
Collapse
|
11
|
Chen JJ. Regulation of protein synthesis by the heme-regulated eIF2alpha kinase: relevance to anemias. Blood 2007; 109:2693-9. [PMID: 17110456 PMCID: PMC1852217 DOI: 10.1182/blood-2006-08-041830] [Citation(s) in RCA: 229] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
During erythroid differentiation and maturation, it is critical that the 3 components of hemoglobin, alpha-globin, beta-globin, and heme, are made in proper stoichiometry to form stable hemoglobin. Heme-regulated translation mediated by the heme-regulated inhibitor kinase (HRI) provides one major mechanism that ensures balanced synthesis of globins and heme. HRI phosphorylates the alpha-subunit of eukaryotic translational initiation factor 2 (eLF2alpha) in heme deficiency, thereby inhibiting protein synthesis globally. In this manner, HRI serves as a feedback inhibitor of globin synthesis by sensing the intracellular concentration of heme through its heme-binding domains. HRI is essential not only for the translational regulation of globins, but also for the survival of erythroid precursors in iron deficiency. Recently, the protective function of HRI has also been demonstrated in murine models of erythropoietic protoporphyria and beta-thalassemia. In these 3 anemias, HRI is essential in determining red blood cell size, number, and hemoglobin content per cell. Translational regulation by HRI is critical to reduce excess synthesis of globin proteins or heme under nonoptimal disease states, and thus reduces the severity of these diseases. The protective role of HRI may be more common among red cell disorders.
Collapse
Affiliation(s)
- Jane-Jane Chen
- Harvard-Massachusetts Institute of Technology (MIT) Division of Health Sciences and Technology (HST), MIT, Cambridge, MA 02139, USA.
| |
Collapse
|
12
|
Nguyen DH, Beuerman RW, Meneray M, Toshida H. Sensory denervation modulates eIF-2 alpha kinase expression in the rabbit lacrimal gland. Curr Eye Res 2006; 31:287-95. [PMID: 16603461 PMCID: PMC2835540 DOI: 10.1080/02713680600598828] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
PURPOSE To investigate the hypothesis that sensory denervation of the rabbit lacrimal gland results in dysregulation of protein synthesis. We used differential display of mRNA to identify genes associated with protein synthesis and secretion that may be altered in this situation. METHODS New Zealand white rabbits underwent unilateral sensory denervation by the ablation of the trigeminal ganglion. After 7 days, the denervated and contralateral control lacrimal glands were removed. The effects of denervation on gene expression were carried out using differential mRNA display. Northern and Western blot analyses were used to verify differential gene expression. RESULTS Differential mRNA display identified the gene heme-regulated inhibitor eukaryotic initiation factor-2 alpha kinase (HRI eIF-2a kinase) in the lacrimal gland, the expression of which was reduced in the denervated lacrimal gland. The sequenced fragment from differential display showed 94% identity to rabbit HRI eIF-2a kinase. The decreased expression of HRI eIF-2a kinase was confirmed by Northern and Western blots, and measurement of HRI eIF-2a kinase phosphorylation activity in the lacrimal gland after ablation of sensory neurons showed that it was significantly decreased compared with that of normal and control lacrimal glands. CONCLUSIONS The results suggest that loss of sensory innervation has a role in the lacrimal gland, contributing to the expression of HRI eIF-2a kinase, a pivotal negative regulator of protein synthesis. A reduction in control of protein synthesis may lead to the translation of repressed messages associated with cell stress responses.
Collapse
Affiliation(s)
- Doan H Nguyen
- LSU Eye Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112, USA.
| | | | | | | |
Collapse
|
13
|
Igarashi K, Sun J. The heme-Bach1 pathway in the regulation of oxidative stress response and erythroid differentiation. Antioxid Redox Signal 2006; 8:107-18. [PMID: 16487043 DOI: 10.1089/ars.2006.8.107] [Citation(s) in RCA: 190] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Heme--as a prosthetic group of proteins required for oxygen transport and storage, respiration, and biosynthetic pathways--is essential for practically all forms of life. Additionally, the degradation products of heme (i.e., carbon monoxide, biliverdin, and bilirubin) produced by the enzymatic actions of heme oxygenase (HO) and biliverdin reductase, possess various biological activities in vivo. In mammalian cells, heme also functions as an intracellular regulator of gene expression by virtue of its ability to bind to Bach1, a transcription factor that functions in association with small Maf proteins. Normally, such complexes function as repressors by binding to specific target sequences, the Maf recognition element (MARE), within enhancers of genes encoding proteins such as HO-1 and beta-globin. By binding to Bach1, heme induces selective removal of the repressor from the gene enhancers permitting subsequent occupancy of the MAREs by activators that, interestingly, also contain small Maf proteins. Thus small Maf proteins play dual functions in gene expression: complexes with Bach1 repress MARE-dependent gene expression, whereas heterodimers with NF-E2 p45 or related factors (Nrf1, Nrf2, and Nrf3) activate MARE-driven genes. By modulating the equilibrium of the small Maf heterodimer network, heme regulates expression of the cytoprotective enzyme HO-1 during the stress response and of beta-globin during erythroid differentiation. Implications of such heme-regulated gene expression in human diseases including atherosclerosis are discussed.
Collapse
Affiliation(s)
- Kazuhiko Igarashi
- Department of Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan.
| | | |
Collapse
|
14
|
Ishikawa H, Kato M, Hori H, Ishimori K, Kirisako T, Tokunaga F, Iwai K. Involvement of heme regulatory motif in heme-mediated ubiquitination and degradation of IRP2. Mol Cell 2005; 19:171-81. [PMID: 16039587 DOI: 10.1016/j.molcel.2005.05.027] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2005] [Revised: 04/15/2005] [Accepted: 05/31/2005] [Indexed: 11/24/2022]
Abstract
Iron regulatory protein 2 (IRP2), a regulator of iron metabolism, is modulated by ubiquitination and degradation. We have shown that IRP2 degradation is triggered by heme-mediated oxidation. We report here that not only Cys201, an invariant residue in the heme regulatory motif (HRM), but also His204 is critical for IRP2 degradation. Spectroscopic studies revealed that Cys201 binds ferric heme, whereas His204 is a ferrous heme binding site, indicating the involvement of these residues in sensing the redox state of the heme iron and in generating the oxidative modification. Moreover, the HRM in IRP2 has been suggested to play a critical role in its recognition by the HOIL-1 ubiquitin ligase. Although HRMs are known to sense heme concentration by simply binding to heme, the HRM in IRP2 specifically contributes to its oxidative modification, its recognition by the ligase, and its sensing of iron concentration after iron is integrated into heme.
Collapse
Affiliation(s)
- Haruto Ishikawa
- Department of Molecular Cell Biology, Graduate School of Medicine, Osaka City University, Osaka 545-8585, Japan
| | | | | | | | | | | | | |
Collapse
|
15
|
Shen X, Zhang K, Kaufman RJ. The unfolded protein response--a stress signaling pathway of the endoplasmic reticulum. J Chem Neuroanat 2004; 28:79-92. [PMID: 15363493 DOI: 10.1016/j.jchemneu.2004.02.006] [Citation(s) in RCA: 208] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2003] [Accepted: 02/15/2004] [Indexed: 12/20/2022]
Abstract
The endoplasmic reticulum (ER) is a factory for folding and maturation of newly synthesized transmembrane and secretory proteins. The ER provides stringent quality control systems to ensure that only correctly folded proteins exit the ER and unfolded or misfolded proteins are retained and ultimately degraded. A number of biochemical and physiological stimuli can change ER homeostasis, impose stress to the ER, and subsequently lead to accumulation of unfolded or misfolded proteins in the ER lumen. The ER has evolved stress response signaling pathways collectively called the unfolded protein response (UPR) to cope with the accumulation of unfolded or misfolded proteins. This review summarizes our understanding of the UPR signaling developed in the recent years.
Collapse
Affiliation(s)
- Xiaohua Shen
- Howard Hughes Medical Institute, The University of Michigan Medical Center, 1150 W. Medical Center Drive, Ann Arbor, MI 48109, USA
| | | | | |
Collapse
|
16
|
Fujita H, Nishitani C, Ogawa K. Regulatory heme and trichloroethylene intoxication: A possible explanation of the case of "A Civil Action". Environ Health Prev Med 2002; 7:103-12. [PMID: 21432291 PMCID: PMC2723491 DOI: 10.1265/ehpm.2002.103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2002] [Accepted: 04/09/2002] [Indexed: 01/03/2023] Open
Abstract
In 1998, a amovie entitled "A Civil Action" was released. The movie described the Woburn case, begun in 1982 and concluded in 1990, one of the most famous cases of trichloroethylene pollution. In a small town near Boston, twelve children died of leukemia, which seemed attributable to trichloroethylene contamination of the drinking water. The victims, however, could not win the case, since evidence that the identified chemicals could cause leukemia and other human illnesses was rather sketchy. There have been many cases of trichloroethylene pollution in industrial nations including Japan, therefore, we reconsidered the missing link. Our conclusion is that the disease occurred not by a direct effect of the chemical hazard on biological macromolecules but by an indirect effect through the physiological system such as signal transduction and transcriptional regulation. In 1984, we reported a marked reduction in the regulatory heme pool by trichloroethylene exposure, however, the biological significance was not well understood. Recently, we found that the DNA binding activity of Bach1, a negative regulator of genes, is controlled by heme, the regulation of which seems to explain how leukemia develops. The heterodimer of Bach1 with MafK recognizes Maf recognition elements (MAREs) competing with the erythroid type positive regulator, a complex of NF-E2 with MafK. Bach1/MafK occupies MAREs under lower heme conditions, whereas MAREs are open to NF-E2/MafK along with increasing heme concentration. Since the NF-E2/MafK function is closely related to normal erythroid differentiation, of which disorders such as sideroblastic anemia are often related to neoplasia; i.e., a clonal disorder that can progress to leukemia. Thus, a marked decline in regulatory heme by trichloroethylene intoxication could be one of the pathways to leukemia.
Collapse
Affiliation(s)
- Hiroyoshi Fujita
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, North 15, West 7, Kita-ku, 060-8638, Supporo, Japan
| | | | | |
Collapse
|
17
|
Fujita H, Nishitani C, Ogawa K. Lead, chemical porphyria, and heme as a biological mediator. TOHOKU J EXP MED 2002; 196:53-64. [PMID: 12498316 DOI: 10.1620/tjem.196.53] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
One of the most well-characterized symptoms of lead poisoning is porphyria. The biochemical signs of lead intoxication related to porphyria are delta-aminolevulinic aciduria, coproporphyrinuria, and accumulation of free and zinc protoporphyrin in erythrocytes. From the 1970s to the early 80s, almost all of the enzymes in the heme pathway had been purified and characterized, and it was demonstrated that delta-aminolevulinic aciduria is due to inhibition of delta-aminolevulinate dehydratase by lead. Lead also inhibits purified ferrochelatase; however, the magnitude of inhibition was essentially nil even under pathological conditions. Further study proved the disturbance of iron-reducing activity by moderate lead exposure. Far different from these two enzymes, lead failed to inhibit purified coproporphyrinogen oxidase, i.e., the mechanism of coproporphyrinuria has not yet been understood. During the 80s to the 90s, the effects of environmental hazards including lead were elucidated through stress proteins, indicating the induction of some heme pathway enzymes as stress proteins. At that time, gene environment interaction was another focus of toxicology, since gene carriers of porphyrias are considered to be a high-risk group to chemical pollutants. Toxicological studies from the 70s to the 90s focused on the direct effect of hazards on biological molecules, such as the heme pathway enzymes, and many environmental pollutants were proved to affect cytosolic heme. Recently, we demonstrated the mechanism of the heme-controlled transcription system, which suggests that the indirect effects of environmental hazards are also important for elucidating toxicity, i.e., the hazards can affect cell functions through such biological mediators as regulatory heme. It is, therefore, probable that toxicology in the future will focus on biological systems such as gene regulation and signal transduction systems.
Collapse
Affiliation(s)
- Hiroyoshi Fujita
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Japan.
| | | | | |
Collapse
|
18
|
Ogawa K, Sun J, Taketani S, Nakajima O, Nishitani C, Sassa S, Hayashi N, Yamamoto M, Shibahara S, Fujita H, Igarashi K. Heme mediates derepression of Maf recognition element through direct binding to transcription repressor Bach1. EMBO J 2001; 20:2835-43. [PMID: 11387216 PMCID: PMC125477 DOI: 10.1093/emboj/20.11.2835] [Citation(s) in RCA: 408] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Heme controls expression of genes involved in the synthesis of globins and heme. The mammalian transcription factor Bach1 functions as a repressor of the Maf recognition element (MARE) by forming antagonizing hetero-oligomers with the small Maf family proteins. We show here that heme binds specifically to Bach1 and regulates its DNA-binding activity. Deletion studies demonstrated that a heme-binding region of Bach1 is confined within its C-terminal region that possesses four dipeptide cysteine-proline (CP) motifs. Mutations in all of the CP motifs of Bach1 abolished its interaction with heme. The DNA-binding activity of Bach1 as a MafK hetero-oligomer was markedly inhibited by heme in gel mobility shift assays. The repressor activity of Bach1 was lost upon addition of hemin in transfected cells. These results suggest that increased levels of heme inactivate the repressor Bach1, resulting in induction of a host of genes with MARES:
Collapse
Affiliation(s)
- Kazuhiro Ogawa
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Jiying Sun
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Shigeru Taketani
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Osamu Nakajima
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Chiaki Nishitani
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Shigeru Sassa
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Norio Hayashi
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Masayuki Yamamoto
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Shigeki Shibahara
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Hiroyoshi Fujita
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| | - Kazuhiko Igarashi
- Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo 060-8638, Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Sendai 980-8575, Department of Biochemistry, Hiroshima University School of Medicine, Kasumi 1-2-3, Minami-Ku, Hiroshima 734-8551, Kyoto Institute of Technology, Kyoto 600-8585, Research Laboratory for Molecular Genetics, Yamagata University, Yamagata 990-9585, Department of Biochemistry, Tohoku University School of Medicine, Sendai 980-8575, Center for Tsukuba Advanced Research Alliance and Institute of Basic Medicine, University of Tsukuba, Tsukuba 305-8575, Japan and The Rockefeller University, New York, NY 10021, USA Present address: Yamanouchi Pharmaceutical Co., Ltd, Itabashi-ku, Tokyo 174-0046, Japan Corresponding author e-mail:
| |
Collapse
|
19
|
Regulation of hemoglobin synthesis and proliferation of differentiating erythroid cells by heme-regulated eIF-2α kinase. Blood 2000. [DOI: 10.1182/blood.v96.9.3241] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractProtein synthesis in reticulocytes depends on the availability of heme. In heme deficiency, inhibition of protein synthesis correlates with the activation of heme-regulated eIF-2α kinase (HRI), which blocks the initiation of protein synthesis by phosphorylating eIF-2α. HRI is a hemoprotein with 2 distinct heme-binding domains. Heme negatively regulates HRI activity by binding directly to HRI. To further study the physiological function of HRI, the wild-type (Wt) HRI and dominant-negative inactive mutants of HRI were expressed by retrovirus-mediated transfer in both non-erythroid NIH 3T3 and mouse erythroleukemic (MEL) cells. Expression of Wt HRI in 3T3 cells resulted in the inhibition of protein synthesis, a loss of proliferation, and eventually cell death. Expression of the inactive HRI mutants had no apparent effect on the growth characteristics or morphology of NIH 3T3 cells. In contrast, expression of 3 dominant-negative inactive mutants of HRI in MEL cells resulted in increased hemoglobin production and increased proliferative capacity of these cells upon dimethyl-sulfoxide induction of erythroid differentiation. These results directly demonstrate the importance of HRI in the regulation of protein synthesis in immature erythroid cells and suggest a role of HRI in the regulation of the numbers of matured erythroid cells.
Collapse
|
20
|
Regulation of hemoglobin synthesis and proliferation of differentiating erythroid cells by heme-regulated eIF-2α kinase. Blood 2000. [DOI: 10.1182/blood.v96.9.3241.h8003241_3241_3248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Protein synthesis in reticulocytes depends on the availability of heme. In heme deficiency, inhibition of protein synthesis correlates with the activation of heme-regulated eIF-2α kinase (HRI), which blocks the initiation of protein synthesis by phosphorylating eIF-2α. HRI is a hemoprotein with 2 distinct heme-binding domains. Heme negatively regulates HRI activity by binding directly to HRI. To further study the physiological function of HRI, the wild-type (Wt) HRI and dominant-negative inactive mutants of HRI were expressed by retrovirus-mediated transfer in both non-erythroid NIH 3T3 and mouse erythroleukemic (MEL) cells. Expression of Wt HRI in 3T3 cells resulted in the inhibition of protein synthesis, a loss of proliferation, and eventually cell death. Expression of the inactive HRI mutants had no apparent effect on the growth characteristics or morphology of NIH 3T3 cells. In contrast, expression of 3 dominant-negative inactive mutants of HRI in MEL cells resulted in increased hemoglobin production and increased proliferative capacity of these cells upon dimethyl-sulfoxide induction of erythroid differentiation. These results directly demonstrate the importance of HRI in the regulation of protein synthesis in immature erythroid cells and suggest a role of HRI in the regulation of the numbers of matured erythroid cells.
Collapse
|
21
|
Rafie-Kolpin M, Chefalo PJ, Hussain Z, Hahn J, Uma S, Matts RL, Chen JJ. Two heme-binding domains of heme-regulated eukaryotic initiation factor-2alpha kinase. N terminus and kinase insertion. J Biol Chem 2000; 275:5171-8. [PMID: 10671563 DOI: 10.1074/jbc.275.7.5171] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In heme deficiency, protein synthesis in reticulocytes is inhibited by activation of heme-regulated alpha-subunit of eukaryotic initiation factor-2alpha (eIF-2alpha) kinase (HRI). Previous studies indicate that HRI contains two distinct heme-binding sites per HRI monomer. To study the role of the N terminus in the heme regulation of HRI, two N-terminally truncated mutants, Met2 and Met3 (deletion of the first 103 and 130 amino acids, respectively), were prepared. Met2 and Met3 underwent autophosphorylation and phosphorylated eIF-2alpha with a specific activity of approximately 50% of that of the wild type HRI. These mutants were significantly less sensitive to heme regulation both in vivo and in vitro. In addition, the heme contents of purified Met2 and Met3 HRI were less than 5% of that of the wild type HRI. These results indicated that the N terminus was important but was not the only domain involved in the heme-binding and heme regulation of HRI. Heme binding of the individual HRI domains showed that both N terminus and kinase insertion were able to bind hemin, whereas the C terminus and the catalytic domains were not. Thus, both the N terminus and the kinase insertion, which are unique to HRI, are involved in the heme binding and the heme regulation of HRI.
Collapse
Affiliation(s)
- M Rafie-Kolpin
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | | | | | | | | | | |
Collapse
|
22
|
Hsp90 regulates protein synthesis by activating the heme-regulated eukaryotic initiation factor 2α (eIF-2α) kinase in rabbit reticulocyte lysates. J Biosci 1998. [DOI: 10.1007/bf02936128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
23
|
Association of HSP90 with the heme-regulated eukaryotic initiation factor 2α kinase—A collaboration for regulating protein synthesis. J Biosci 1996. [DOI: 10.1007/bf02703108] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
24
|
Chefalo PJ, Yang JM, Ramaiah KV, Gehrke L, Chen JJ. Inhibition of protein synthesis in insect cells by baculovirus-expressed heme-regulated eIF-2 alpha kinase. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(18)47317-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
25
|
Abstract
The role of heme-regulated eIF-2 alpha kinase (HRI) in the regulation of protein synthesis in rabbit reticulocytes is well documented. Inhibitors of protein synthesis with properties similar to those of HRI have been described in some nonerythroid cell types, but it has not yet been determined whether these eIF-2 alpha kinase activities are mediated by HRI or one or more as yet uncharacterized kinases. We have studied the expression of mRNA, polypeptide, and kinase activities of HRI in various tissues from both nonanemic and anemic rabbits. Our results indicate that HRI is expressed in an erythroid cell-specific manner. HRI is present in the bone marrow and peripheral blood of both nonanemic and anemic rabbits but not in any of the other tissues tested. HRI mRNA is present at low levels in uninduced mouse erythroleukemic (MEL) cells and human K562 cells and accumulates to higher levels upon induction. The accumulation of HRI mRNA in differentiating MEL cells is dependent upon the presence of heme. The addition of 3-amino-1,2,4-triazole (AT), an inhibitor of heme biosynthesis, to the induction medium markedly reduced HRI mRNA accumulation. Simultaneous addition of hemin and AT to the dimethyl sulfoxide induction medium largely prevented the inhibition of HRI mRNA induction by AT. These findings indicate that HRI is expressed in an erythroid cell-specific manner and that the major physiologic role of HRI is in adjusting the synthesis of globins to the availability of heme.
Collapse
|
26
|
Crosby JS, Lee K, London IM, Chen JJ. Erythroid expression of the heme-regulated eIF-2 alpha kinase. Mol Cell Biol 1994; 14:3906-14. [PMID: 7910943 PMCID: PMC358757 DOI: 10.1128/mcb.14.6.3906-3914.1994] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The role of heme-regulated eIF-2 alpha kinase (HRI) in the regulation of protein synthesis in rabbit reticulocytes is well documented. Inhibitors of protein synthesis with properties similar to those of HRI have been described in some nonerythroid cell types, but it has not yet been determined whether these eIF-2 alpha kinase activities are mediated by HRI or one or more as yet uncharacterized kinases. We have studied the expression of mRNA, polypeptide, and kinase activities of HRI in various tissues from both nonanemic and anemic rabbits. Our results indicate that HRI is expressed in an erythroid cell-specific manner. HRI is present in the bone marrow and peripheral blood of both nonanemic and anemic rabbits but not in any of the other tissues tested. HRI mRNA is present at low levels in uninduced mouse erythroleukemic (MEL) cells and human K562 cells and accumulates to higher levels upon induction. The accumulation of HRI mRNA in differentiating MEL cells is dependent upon the presence of heme. The addition of 3-amino-1,2,4-triazole (AT), an inhibitor of heme biosynthesis, to the induction medium markedly reduced HRI mRNA accumulation. Simultaneous addition of hemin and AT to the dimethyl sulfoxide induction medium largely prevented the inhibition of HRI mRNA induction by AT. These findings indicate that HRI is expressed in an erythroid cell-specific manner and that the major physiologic role of HRI is in adjusting the synthesis of globins to the availability of heme.
Collapse
MESH Headings
- Anemia/enzymology
- Animals
- Blotting, Northern
- Blotting, Western
- Cell Line
- Cells, Cultured
- Erythrocytes/enzymology
- Gene Expression Regulation, Enzymologic
- Heme/pharmacology
- Humans
- Leukemia, Experimental
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive
- Mice
- Organ Specificity
- Polymerase Chain Reaction
- Protein Serine-Threonine Kinases/analysis
- Protein Serine-Threonine Kinases/biosynthesis
- Protein Serine-Threonine Kinases/blood
- RNA, Messenger/isolation & purification
- RNA, Messenger/metabolism
- Rabbits
- Tumor Cells, Cultured
- eIF-2 Kinase
Collapse
Affiliation(s)
- J S Crosby
- Harvard-M.I.T. Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | | | | | | |
Collapse
|
27
|
Clemens MJ. Regulation of eukaryotic protein synthesis by protein kinases that phosphorylate initiation factor eIF-2. Mol Biol Rep 1994; 19:201-10. [PMID: 7969108 DOI: 10.1007/bf00986962] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- M J Clemens
- Department of Cellular and Molecular Sciences, St George's Hospital Medical School, London, UK
| |
Collapse
|
28
|
Méndez R, de Haro C. Casein kinase II is implicated in the regulation of heme-controlled translational inhibitor of reticulocyte lysates. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37584-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
29
|
Chen JJ, Crosby JS, London IM. Regulation of heme-regulated eIF-2 alpha kinase and its expression in erythroid cells. Biochimie 1994; 76:761-9. [PMID: 7893826 DOI: 10.1016/0300-9084(94)90080-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this article we focus first on the molecular mechanisms controlling the activity of the heme-regulated translational inhibitor, HRI, in erythroid cells. Then we discuss the tissue-specific expression of HRI. The experimental evidence obtained to date indicates that the major physiological role of HRI is in adjusting the synthesis of globin to the availability of heme.
Collapse
Affiliation(s)
- J J Chen
- Harvard-Massachusetts Institute of Technology, Division of Health Sciences and Technology, Cambridge 02139, USA
| | | | | |
Collapse
|
30
|
Lee TG, Katze MG. Cellular inhibitors of the interferon-induced, dsRNA-activated protein kinase. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 1994; 14:48-65. [PMID: 7914806 DOI: 10.1007/978-3-642-78549-8_4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- T G Lee
- Department of Microbiology, School of Medicine, University of Washington, Seattle 98195
| | | |
Collapse
|
31
|
Dever TE, Chen JJ, Barber GN, Cigan AM, Feng L, Donahue TF, London IM, Katze MG, Hinnebusch AG. Mammalian eukaryotic initiation factor 2 alpha kinases functionally substitute for GCN2 protein kinase in the GCN4 translational control mechanism of yeast. Proc Natl Acad Sci U S A 1993; 90:4616-20. [PMID: 8099443 PMCID: PMC46563 DOI: 10.1073/pnas.90.10.4616] [Citation(s) in RCA: 181] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Phosphorylation of the alpha subunit of eukaryotic initiation factor 2 (eIF-2 alpha) in Saccharomyces cerevisiae by the GCN2 protein kinase stimulates the translation of GCN4 mRNA. The protein kinases heme-regulated inhibitor of translation (HRI) and double-stranded RNA-dependent eIF-2 alpha protein kinase (dsRNA-PK) inhibit initiation of translation in mammalian cells by phosphorylating Ser-51 of eIF-2 alpha. We show that HRI and dsRNA-PK phosphorylate yeast eIF-2 alpha in vitro and in vivo and functionally substitute for GCN2 protein to stimulate GCN4 translation in yeast. In addition, high-level expression of either mammalian kinase in yeast decreases the growth rate, a finding analogous to the inhibition of total protein synthesis by these kinases in mammalian cells. Phosphorylation of eIF-2 alpha inhibits initiation in mammalian cells by sequestering eIF-2B, the factor required for exchange of GTP for GDP on eIF-2. Mutations in the GCN3 gene, encoding a subunit of the yeast eIF-2B complex, eliminate the effects of HRI and dsRNA-PK on global and GCN4-specific translation in yeast. These results provide further in vivo evidence that phosphorylation of eIF-2 alpha inhibits translation by impairing eIF-2B function and identify GCN3 as a regulatory subunit of eIF-2B. These results also suggest that GCN4 translational control will be a good model system to study how mammalian eIF-2 alpha kinases are modulated by environmental signals and viral regulatory factors.
Collapse
Affiliation(s)
- T E Dever
- Section on Molecular Genetics of Lower Eukaryotes, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
The eIF-2 alpha protein kinases, regulators of translation in eukaryotes from yeasts to humans. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)52994-x] [Citation(s) in RCA: 297] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
33
|
Son M, Gundersen R, Nelson D. A second member of the novel Ca(2+)-dependent protein kinase family from Paramecium tetraurelia. Purification and characterization. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53410-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
34
|
Mellor H, Price NT, Oldfield S, Sarre TF, Proud CG. Purification and characterisation of an initiation-factor-2 kinase from uninduced mouse erythroleukaemia cells. EUROPEAN JOURNAL OF BIOCHEMISTRY 1993; 211:529-38. [PMID: 8094668 DOI: 10.1111/j.1432-1033.1993.tb17579.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Mouse erythroleukaemia (MEL) cells, which have not been induced into erythroid development, contain a protein kinase (MKu) which phosphorylates the alpha subunit of protein-synthesis-initiation factor 2 (eIF-2 alpha). In this paper, we show that this kinase phosphorylates both eIF-2 alpha and a synthetic peptide based on the phosphorylation site in eIF-2 alpha at Ser51, the target residue for other eIF-2 alpha kinases. Consistent with this, prior treatment of eIF-2 with MKu impaired the exchange of bound GDP for GTP which is catalysed by the exchange factor eIF-2B. Using a modified cell-free translation system, we have shown that MKu inhibits translation, consistent with the above observations concerning the site of phosphorylation and the effect of phosphorylation on eIF-2B-mediated guanine-nucleotide exchange. MKu has been purified and its properties have been compared with those of the haem-controlled repressor eIF-2 alpha kinase (HCR) from rabbit reticulocytes. Its behaviour on gel filtration is similar to that of HCR, while its behaviour on anion exchange resembles that of certain phosphorylated species of HCR. Highly purified preparations of MKu contain a protein with an apparent molecular mass of 98 kDa which comigrates with HCR on SDS/PAGE. This protein undergoes phosphorylation when incubated in the presence of Mg(2+)-ATP, and both this apparent autophosphorylation and the activity of the kinase against eIF-2 alpha are inhibited by the same, low, (10 microM) concentrations of haemin. Phosphorylation of the 98-kDa components present in the MEL-cell kinase preparation and in purified rabbit reticulocyte HCR occurs on serine and threonine residues. Analysis of these phosphoproteins by peptide mapping reveals significant differences in their structures, indicating that they may be closely related, but are certainly not identical.
Collapse
Affiliation(s)
- H Mellor
- Department of Biochemistry, School of Medical Sciences, University of Bristol, England
| | | | | | | | | |
Collapse
|
35
|
Yang J, London I, Chen J. Effects of hemin and porphyrin compounds on intersubunit disulfide formation of heme-regulated eIF-2 alpha kinase and the regulation of protein synthesis in reticulocyte lysates. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)88733-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
36
|
Méndez R, Moreno A, de Haro C. Regulation of heme-controlled eukaryotic polypeptide chain initiation factor 2 alpha-subunit kinase of reticulocyte lysates. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)49938-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
37
|
Affiliation(s)
- C G Proud
- Department of Biochemistry, School of Medical Sciences, University of Bristol, England
| |
Collapse
|
38
|
Chen JJ, Throop MS, Gehrke L, Kuo I, Pal JK, Brodsky M, London IM. Cloning of the cDNA of the heme-regulated eukaryotic initiation factor 2 alpha (eIF-2 alpha) kinase of rabbit reticulocytes: homology to yeast GCN2 protein kinase and human double-stranded-RNA-dependent eIF-2 alpha kinase. Proc Natl Acad Sci U S A 1991; 88:7729-33. [PMID: 1679235 PMCID: PMC52376 DOI: 10.1073/pnas.88.17.7729] [Citation(s) in RCA: 168] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
We have cloned the cDNA of the heme-regulated eIF-2 alpha kinase (HRI) of rabbit reticulocytes. In vitro translation of mRNA transcribed from the HRI cDNA yields a 90-kDa polypeptide that exhibits eIF-2 alpha kinase activity and is recognized by a monoclonal antibody directed against authentic HRI. The open reading frame sequence of the HRI cDNA contains all 11 catalytic domains of protein kinases with consensus sequences of protein-serine/threonine kinases in conserved catalytic domains VI and VIII. The HRI cDNA also contains an insert of approximately 140 amino acids between catalytic domains V and VI. The HRI cDNA coding sequence has extensive homology to GCN2 protein kinase of Saccharomyces cerevisiae and to human double-stranded-RNA-dependent eIF-2 alpha kinase. This observation suggests that GCN2 protein kinase may be an eIF-2 alpha kinase in yeast. In addition, HRI has an unusually high degree of homology to three protein kinases (NimA, Wee1, and CDC2) that are involved in the regulation of the cell cycle.
Collapse
Affiliation(s)
- J J Chen
- Harvard-Massachusetts Institute of Technology Division of Health Sciences and Technology, Cambridge
| | | | | | | | | | | | | |
Collapse
|