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Wrutniak-Cabello C, Casas F, Cabello G. Mitochondrial T3 receptor and targets. Mol Cell Endocrinol 2017; 458:112-120. [PMID: 28167126 DOI: 10.1016/j.mce.2017.01.054] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 01/28/2017] [Accepted: 01/31/2017] [Indexed: 12/25/2022]
Abstract
The demonstration that TRα1 mRNA encodes a nuclear thyroid hormone receptor and two proteins imported into mitochondria with molecular masses of 43 and 28 kDa has brought new clues to better understand the pleiotropic influence of iodinated hormones. If p28 activity remains unknown, p43 binds to T3 responsive elements occurring in the organelle genome, and, in the T3 presence, stimulates mitochondrial transcription and the subsequent synthesis of mitochondrial encoded proteins. This influence increases mitochondrial activity and through changes in the mitochondrial/nuclear cross talk affects important nuclear target genes regulating cell proliferation and differentiation, oncogenesis, or apoptosis. In addition, this pathway influences muscle metabolic and contractile phenotype, as well as glycaemia regulation. Interestingly, according to the process considered, p43 exerts opposite or cooperative effects with the well-known T3 pathway, thus allowing a fine tuning of the physiological influence of this hormone.
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Affiliation(s)
- Chantal Wrutniak-Cabello
- INRA, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France; Université de Montpellier, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France.
| | - François Casas
- INRA, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France; Université de Montpellier, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France
| | - Gérard Cabello
- INRA, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France; Université de Montpellier, UMR 866 Dynamique Musculaire et Métabolisme, 34060 Montpellier, France
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Lasserre JP, Plissonneau J, Velours C, Bonneu M, Litvak S, Laquel P, Castroviejo M. Biochemical, cellular and molecular identification of DNA polymerase α in yeast mitochondria. Biochimie 2013; 95:759-71. [DOI: 10.1016/j.biochi.2012.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 11/07/2012] [Indexed: 11/15/2022]
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3
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Tammineni P, Anugula C, Mohammed F, Anjaneyulu M, Larner AC, Sepuri NBV. The import of the transcription factor STAT3 into mitochondria depends on GRIM-19, a component of the electron transport chain. J Biol Chem 2012; 288:4723-32. [PMID: 23271731 DOI: 10.1074/jbc.m112.378984] [Citation(s) in RCA: 167] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The signal transducer and activator of transcription 3 (STAT3), a nuclear transcription factor, is also present in mitochondria and regulates cellular respiration in a transcriptional-independent manner. The mechanism of STAT3 import into mitochondria remains obscure. In this report we show that mitochondrial-localized STAT3 resides in the inner mitochondrial membrane. In vitro import studies show that the gene associated with retinoid interferon induced cell mortality 19 (GRIM-19), a complex I subunit that acts as a chaperone to recruit STAT3 into mitochondria. In addition, GRIM-19 enhances the integration of STAT3 into complex I. A S727A mutation in STAT3 reduces its import and assembly even in the presence of GRIM-19. Together, our studies unveil a novel chaperone function for GRIM-19 in the recruitment of STAT3 into mitochondria.
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Affiliation(s)
- Prasad Tammineni
- Department of Biochemistry, University of Hyderabad, Hyderabad 500046, India
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4
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Carazo A, Levin J, Casas F, Seyer P, Grandemange S, Busson M, Pessemesse L, Wrutniak-Cabello C, Cabello G. Protein sequences involved in the mitochondrial import of the 3,5,3′-L-triiodothyronine receptor p43. J Cell Physiol 2012; 227:3768-77. [DOI: 10.1002/jcp.24085] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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5
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Nuclear factor-κB, p53, and mitochondria: regulation of cellular metabolism and the Warburg effect. Trends Biochem Sci 2012; 37:317-24. [PMID: 22626470 DOI: 10.1016/j.tibs.2012.04.002] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 04/05/2012] [Accepted: 04/06/2012] [Indexed: 01/12/2023]
Abstract
Among the characteristics acquired by many tumour cells is a shift from using oxidative phosphorylation to using glycolysis for ATP production. Although the nuclear factor (NF)-κB family of transcriptional regulators have important roles in tumorigenesis, their ability to function as regulators of metabolism has only been recently investigated. This has revealed the importance of crosstalk between NF-κB, the p53 tumour suppressor and other crucial cell signalling pathways. This review discusses the mechanisms through which NF-κB regulates tumour cell metabolism and the important role of p53 in determining the consequences of NF-κB activity. It also proposes a model in which NF-κB contributes to the shift to glycolytic ATP production through regulation of both nuclear and mitochondrial gene expression.
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Sun W, Wang L, Jiang H, Chen D, Murchie AI. Targeting mitochondrial transcription in fission yeast with ETB, an inhibitor of HSP60, the chaperone that binds to the mitochondrial transcription factor Mtf1. Genes Cells 2012; 17:122-31. [DOI: 10.1111/j.1365-2443.2011.01578.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Kuroda Y, Sako W, Goto S, Sawada T, Uchida D, Izumi Y, Takahashi T, Kagawa N, Matsumoto M, Matsumoto M, Takahashi R, Kaji R, Mitsui T. Parkin interacts with Klokin1 for mitochondrial import and maintenance of membrane potential. Hum Mol Genet 2011; 21:991-1003. [DOI: 10.1093/hmg/ddr530] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Sun W, Wang Z, Jiang H, Zhang J, Bähler J, Chen D, Murchie AIH. A novel function of the mitochondrial transcription factor Mtf1 in fission yeast; Mtf1 regulates the nuclear transcription of srk1. Nucleic Acids Res 2010; 39:2690-700. [PMID: 21138961 PMCID: PMC3074130 DOI: 10.1093/nar/gkq1179] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In eukaryotic cells, Mtf1 and its homologues function as mitochondrial transcription factors for the mitochondrial RNA polymerase in the mitochondrion. Here we show that in fission yeast Mtf1 exerts a non-mitochondrial function as a nuclear factor that regulates transcription of srk1, which is a kinase involved in the stress response and cell cycle progression. We first found Mtf1 expression in the nucleus. A ChIP-chip approach identified srk1 as a putative Mtf1 target gene. Over expression of Mtf1 induced transcription of the srk1 gene and Mtf1 deletion led to a reduction in transcription of the srk1 gene in vivo. Mtf1 overexpression causes cell elongation in a srk1 dependent manner. Mtf1 overexpression can cause cytoplasmic accumulation of Cdc25. We also provide biochemical evidence that Mtf1 binds to the upstream sequence of srk1. This is the first evidence that a mitochondrial transcription factor Mtf1 can regulate a nuclear gene. Mtf1 may also have a role in cell cycle progression.
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Affiliation(s)
- Wenxia Sun
- Institute of Biomedical Science, Fudan University, Yi Xue Yuan Road 138, 200032 Shanghai, China
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9
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Protein import into hydrogenosomes of Trichomonas vaginalis involves both N-terminal and internal targeting signals: a case study of thioredoxin reductases. EUKARYOTIC CELL 2008; 7:1750-7. [PMID: 18676956 DOI: 10.1128/ec.00206-08] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The parabasalian flagellate Trichomonas vaginalis harbors mitochondrion-related and H(2)-producing organelles of anaerobic ATP synthesis, called hydrogenosomes, which harbor oxygen-sensitive enzymes essential to its pyruvate metabolism. In the human urogenital tract, however, T. vaginalis is regularly exposed to low oxygen concentrations and therefore must possess antioxidant systems protecting the organellar environment against the detrimental effects of molecular oxygen and reactive oxygen species. We have identified two closely related hydrogenosomal thioredoxin reductases (TrxRs), the hitherto-missing component of a thioredoxin-linked hydrogenosomal antioxidant system. One of the two hydrogenosomal TrxR isoforms, TrxRh1, carried an N-terminal extension resembling known hydrogenosomal targeting signals. Expression of hemagglutinin-tagged TrxRh1 in transfected T. vaginalis cells revealed that its N-terminal extension was necessary to import the protein into the organelles. The second hydrogenosomal TrxR isoform, TrxRh2, had no N-terminal targeting signal but was nonetheless efficiently targeted to hydrogenosomes. N-terminal presequences from hydrogenosomal proteins with known processing sites, i.e., the alpha subunit of succinyl coenzyme A synthetase (SCSalpha) and pyruvate:ferredoxin oxidoreductase A, were investigated for their ability to direct mature TrxRh1 to hydrogenosomes. Neither presequence directed TrxRh1 to hydrogenosomes, indicating that neither extension is, by itself, sufficient for hydrogenosomal targeting. Moreover, SCSalpha lacking its N-terminal extension was efficiently imported into hydrogenosomes, indicating that this extension is not required for import of this major hydrogenosomal protein. The finding that some hydrogenosomal enzymes require N-terminal signals for import but that in others the N-terminal extension is not necessary for targeting indicates the presence of additional targeting signals within the mature subunits of several hydrogenosome-localized proteins.
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Wrutniak-Cabello C, Carazo A, Casas F, Cabello G. Les récepteurs mitochondriaux de la triiodothyronine : import et mécanismes d'action. ACTA ACUST UNITED AC 2008; 202:83-92. [DOI: 10.1051/jbio:2008010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Williams S, Saha L, Singha UK, Chaudhuri M. Trypanosoma brucei: differential requirement of membrane potential for import of proteins into mitochondria in two developmental stages. Exp Parasitol 2007; 118:420-33. [PMID: 18021773 DOI: 10.1016/j.exppara.2007.10.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2007] [Revised: 09/12/2007] [Accepted: 10/02/2007] [Indexed: 11/19/2022]
Abstract
Trypanosome alternative oxidase (TAO) and the cytochrome oxidase (COX) are two developmentally regulated terminal oxidases of the mitochondrial electron transport chain in Trypanosoma brucei. Here, we have compared the import of TAO and cytochrome oxidase subunit IV (COIV), two stage-specific nuclear encoded mitochondrial proteins, into the bloodstream and procyclic form mitochondria of T. brucei to understand the import processes in two different developmental stages. Under in vitro conditions TAO and COIV were imported and processed into isolated mitochondria from both the bloodstream and procyclic forms. With mitochondria isolated from the procyclic form, the import of TAO and COIV was dependent on the mitochondrial inner membrane potential (delta psi) and required protein(s) on the outer membrane. Import of these proteins also depended on the presence of both internal and external ATP. However, import of TAO and COIV into isolated mitochondria from the bloodstream form was not inhibited after the mitochondrial delta psi was dissipated by valinomycin, CCCP, or valinomycin and oligomycin in combination. In contrast, import of these proteins into bloodstream mitochondria was abolished after the hydrolysis of ATP by apyrase or removal of the ATP and ATP-generating system, suggesting that import is dependent on the presence of external ATP. Together, these data suggest that nuclear encoded proteins such as TAO and COIV are imported in the mitochondria of the bloodstream and the procyclic forms via different mechanism. Differential import conditions of nuclear encoded mitochondrial proteins of T. brucei possibly help it to adapt to different life forms.
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Affiliation(s)
- Shuntae Williams
- Department of Microbial Pathogenesis and Immune Response, School of Medicine, Meharry Medical College, 1005 D.B. Todd Jr. Boulevard, Nashville, TN 37208, USA
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Habib SJ, Neupert W, Rapaport D. Analysis and prediction of mitochondrial targeting signals. Methods Cell Biol 2007; 80:761-81. [PMID: 17445721 DOI: 10.1016/s0091-679x(06)80035-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shukry J Habib
- Institut für Physiologische Chemie, Universität München, D-81377 Munich, Germany
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Subbaiah CC, Palaniappan A, Duncan K, Rhoads DM, Huber SC, Sachs MM. Mitochondrial Localization and Putative Signaling Function of Sucrose Synthase in Maize. J Biol Chem 2006; 281:15625-35. [PMID: 16606624 DOI: 10.1074/jbc.m600355200] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In many organisms, an increasing number of proteins seem to play two or more unrelated roles. Here we report that maize sucrose synthase (SUS) is distributed in organelles not involved in sucrose metabolism and may have novel roles beyond sucrose degradation. Bioinformatics analysis predicts that among the three maize SUS isoforms, SH1 protein has a putative mitochondrial targeting peptide (mTP). We validated this prediction by the immunodetection of SUS in mitochondria. Analysis with isoform-specific antisera revealed that both SH1 and SUS1 are represented in mitochondria, although the latter lacks a canonical mTP. The SUS2 isoform is not detectable in mitochondria, despite its presence in the cytosol. In maize primary roots, the mitochondrion-associated SUS (mtSUS; which includes SH1 and SUS1) is present mostly in the root tip, indicating tissue-specific regulation of SUS compartmentation. Unlike the glycolytic enzymes that occur attached to the outside of mitochondria, SH1 and SUS1 are intramitochondrial. The low abundance of SUS in mitochondria, its high Km value for sucrose, and the lack of sucrose in mitochondria suggest that mtSUS plays a non-sucrolytic role. Co-immunoprecipitation studies indicate that SUS interacts with the voltage-dependent anion channel in an isoform-specific and anoxia-enhanced manner and may be involved in the regulation of solute fluxes into and out of mitochondria. In several plant species, at least one of the SUS proteins possesses a putative mTP, indicating the conservation of the noncatalytic function across plant species. Taken together, these observations suggest that SUS has a novel noncatalytic function in plant cells.
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Biswas TK, Getz GS. Requirement of different mitochondrial targeting sequences of the yeast mitochondrial transcription factor Mtf1p when synthesized in alternative translation systems. Biochem J 2005; 383:383-91. [PMID: 15257659 PMCID: PMC1134080 DOI: 10.1042/bj20040691] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mitochondrial (mt) translocation of the nuclearly encoded mt transcription factor Mtf1p appears to occur independent of a cleavable presequence, mt receptor, mt membrane potential or ATP [Biswas and Getz (2002) J. Biol. Chem. 277, 45704-45714]. To understand further the import strategy of Mtf1p, we investigated the import of the wild-type and N-terminal-truncated Mtf1p mutants synthesized in two different in vitro translation systems. These Mtf1p derivatives were generated either in the RRL (rabbit reticulocyte lysate) or in the WGE (wheat germ extract) translation system. Under the in vitro import conditions, the RRL-synthesized full-length Mtf1p but not the N-terminal-truncated Mtf1p product was efficiently imported into mitochondria, suggesting that the N-terminal sequence is important for its import. On the other hand, when these Mtf1p products were generated in the WGE system, surprisingly, the N-terminal-truncated products, but not the full-length protein, were effectively translocated into mitochondria. Despite these differences between the translation systems, in both cases, import occurs at a low temperature and has no requirement for a trypsin-sensitive mt receptor, mt membrane potential or ATP hydrolysis. Together, these observations suggest that, in the presence of certain cytoplasmic factors (derived from either RRL or WGE), Mtf1p is capable of using alternative import signals present in different regions of the protein. This appears to be the first example of usage of different targeting sequences for the transport of a single mt protein into the mt matrix.
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Affiliation(s)
- Tapan K Biswas
- Department of Pathology, University of Chicago, 5841 South Maryland Avenue, Chicago, IL 60637, USA.
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Chandok MR, Ytterberg AJ, van Wijk KJ, Klessig DF. The pathogen-inducible nitric oxide synthase (iNOS) in plants is a variant of the P protein of the glycine decarboxylase complex. Cell 2003; 113:469-82. [PMID: 12757708 DOI: 10.1016/s0092-8674(03)00350-7] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A growing body of evidence indicates that nitric oxide (NO) plays important signaling roles in plants. However, the enzyme(s) responsible for its synthesis after infection was unknown. Here, we demonstrate that the pathogen-induced, NO-synthesizing enzyme is a variant form of the P protein of glycine decarboxylase (GDC). Inhibitors of the P protein of GDC block its NO synthase (NOS)-like activity, and variant P produced in E. coli or insect cells displays NOS activity. The plant enzyme shares many biochemical and kinetic properties with animal NOSs. However, only a few of the critical motifs associated with NO production in animals can be recognized in the variant P sequence, suggesting that it uses very different chemistry for NO synthesis. Since nitrate reductase is likely responsible for NO production in uninfected or nonelicited plants, our results suggest that plants, like animals, use multiple enzymes for the synthesis of this critical hormone.
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Affiliation(s)
- Meena R Chandok
- Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY 14853, USA
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Current awareness on yeast. Yeast 2003; 20:555-62. [PMID: 12749362 DOI: 10.1002/yea.944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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