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Dong YN, Mercado-Ayón E, Coulman J, Flatley L, Ngaba LV, Adeshina MW, Lynch DR. The Regulation of the Disease-Causing Gene FXN. Cells 2024; 13:1040. [PMID: 38920668 PMCID: PMC11202134 DOI: 10.3390/cells13121040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 06/10/2024] [Accepted: 06/13/2024] [Indexed: 06/27/2024] Open
Abstract
Friedreich's ataxia (FRDA) is a progressive neurodegenerative disease caused in almost all patients by expanded guanine-adenine-adenine (GAA) trinucleotide repeats within intron 1 of the FXN gene. This results in a relative deficiency of frataxin, a small nucleus-encoded mitochondrial protein crucial for iron-sulfur cluster biogenesis. Currently, there is only one medication, omaveloxolone, available for FRDA patients, and it is limited to patients 16 years of age and older. This necessitates the development of new medications. Frataxin restoration is one of the main strategies in potential treatment options as it addresses the root cause of the disease. Comprehending the control of frataxin at the transcriptional, post-transcriptional, and post-translational stages could offer potential therapeutic approaches for addressing the illness. This review aims to provide a general overview of the regulation of frataxin and its implications for a possible therapeutic treatment of FRDA.
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Affiliation(s)
- Yi Na Dong
- Departments of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | | | - Jennifer Coulman
- Departments of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Liam Flatley
- The Wharton School, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lucie Vanessa Ngaba
- Departments of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Miniat W. Adeshina
- Departments of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - David R. Lynch
- Departments of Pediatrics and Neurology, The Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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2
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Jung SJ, Sridhara S, Ott M. Early steps in the biogenesis of mitochondrially encoded oxidative phosphorylation subunits. IUBMB Life 2024; 76:125-139. [PMID: 37712772 DOI: 10.1002/iub.2784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 08/10/2023] [Indexed: 09/16/2023]
Abstract
The complexes mediating oxidative phosphorylation (OXPHOS) in the inner mitochondrial membrane consist of proteins encoded in the nuclear or the mitochondrial DNA. The mitochondrially encoded membrane proteins (mito-MPs) represent the catalytic core of these complexes and follow complicated pathways for biogenesis. Owing to their overall hydrophobicity, mito-MPs are co-translationally inserted into the inner membrane by the Oxa1 insertase. After insertion, OXPHOS biogenesis factors mediate the assembly of mito-MPs into complexes and participate in the regulation of mitochondrial translation, while protein quality control factors recognize and degrade faulty or excess proteins. This review summarizes the current understanding of these early steps occurring during the assembly of mito-MPs by concentrating on results obtained in the model organism baker's yeast.
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Affiliation(s)
- Sung-Jun Jung
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Sagar Sridhara
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Martin Ott
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
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3
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Metzger MB, Scales JL, Grant GA, Molnar AE, Loncarek J, Weissman AM. Differential sensitivity of the yeast Lon protease Pim1p to impaired mitochondrial respiration. J Biol Chem 2023; 299:104937. [PMID: 37331598 PMCID: PMC10359500 DOI: 10.1016/j.jbc.2023.104937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 06/05/2023] [Accepted: 06/07/2023] [Indexed: 06/20/2023] Open
Abstract
Mitochondria are essential organelles whose proteome is well protected by regulated protein degradation and quality control. While the ubiquitin-proteasome system can monitor mitochondrial proteins that reside at the mitochondrial outer membrane or are not successfully imported, resident proteases generally act on proteins within mitochondria. Herein, we assess the degradative pathways for mutant forms of three mitochondrial matrix proteins (mas1-1HA, mas2-11HA, and tim44-8HA) in Saccharomyces cerevisiae. The degradation of these proteins is strongly impaired by loss of either the matrix AAA-ATPase (m-AAA) (Afg3p/Yta12p) or Lon (Pim1p) protease. We determine that these mutant proteins are all bona fide Pim1p substrates whose degradation is also blocked in respiratory-deficient "petite" yeast cells, such as in cells lacking m-AAA protease subunits. In contrast, matrix proteins that are substrates of the m-AAA protease are not affected by loss of respiration. The failure to efficiently remove Pim1p substrates in petite cells has no evident relationship to Pim1p maturation, localization, or assembly. However, Pim1p's autoproteolysis is intact, and its overexpression restores substrate degradation, indicating that Pim1p retains some functionality in petite cells. Interestingly, chemical perturbation of mitochondria with oligomycin similarly prevents degradation of Pim1p substrates. Our results demonstrate that Pim1p activity is highly sensitive to mitochondrial perturbations such as loss of respiration or drug treatment in a manner that we do not observe with other proteases.
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Affiliation(s)
- Meredith B Metzger
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA.
| | - Jessica L Scales
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA
| | - Garis A Grant
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA
| | - Abigail E Molnar
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA
| | - Jadranka Loncarek
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA
| | - Allan M Weissman
- Cancer Innovation Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland, USA.
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4
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Vazquez‐Calvo C, Kohler V, Höög JL, Büttner S, Ott M. Newly imported proteins in mitochondria are particularly sensitive to aggregation. Acta Physiol (Oxf) 2023; 238:e13985. [PMID: 37171464 PMCID: PMC10909475 DOI: 10.1111/apha.13985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/20/2023] [Accepted: 05/09/2023] [Indexed: 05/13/2023]
Abstract
AIM A functional proteome is essential for life and maintained by protein quality control (PQC) systems in the cytosol and organelles. Protein aggregation is an indicator of a decline of PQC linked to aging and disease. Mitochondrial PQC is critical to maintain mitochondrial function and thus cellular fitness. How mitochondria handle aggregated proteins is not well understood. Here we tested how the metabolic status impacts on formation and clearance of aggregates within yeast mitochondria and assessed which proteins are particularly sensitive to denaturation. METHODS Confocal microscopy, electron microscopy, immunoblotting and genetics were applied to assess mitochondrial aggregate handling in response to heat shock and ethanol using the mitochondrial disaggregase Hsp78 as a marker for protein aggregates. RESULTS We show that aggregates formed upon heat or ethanol stress with different dynamics depending on the metabolic state. While fermenting cells displayed numerous small aggregates that coalesced into one large foci that was resistant to clearance, respiring cells showed less aggregates and cleared these aggregates more efficiently. Acute inhibition of mitochondrial translation had no effect, while preventing protein import into mitochondria by inhibition of cytosolic translation prevented aggregate formation. CONCLUSION Collectively, our data show that the metabolic state of the cells impacts the dynamics of aggregate formation and clearance, and that mainly newly imported and not yet assembled proteins are prone to form aggregates. Because mitochondrial functionality is crucial for cellular metabolism, these results highlight the importance of efficient protein biogenesis to maintain the mitochondrial proteome operational during metabolic adaptations and cellular stress.
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Affiliation(s)
- Carmela Vazquez‐Calvo
- Department of Biochemistry and BiophysicsStockholm UniversityStockholmSweden
- Department of Molecular Biosciences, The Wenner‐Gren InstituteStockholm UniversityStockholmSweden
| | - Verena Kohler
- Department of Molecular Biosciences, The Wenner‐Gren InstituteStockholm UniversityStockholmSweden
- Institute of Molecular BiosciencesUniversity of GrazGrazAustria
| | - Johanna L. Höög
- Department of Chemistry and Molecular BiologyUniversity of GothenburgGothenburgSweden
| | - Sabrina Büttner
- Department of Molecular Biosciences, The Wenner‐Gren InstituteStockholm UniversityStockholmSweden
| | - Martin Ott
- Department of Biochemistry and BiophysicsStockholm UniversityStockholmSweden
- Department of Medical Biochemistry and Cell BiologyUniversity of GothenburgGothenburgSweden
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5
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Song J, Steidle L, Steymans I, Singh J, Sanner A, Böttinger L, Winter D, Becker T. The mitochondrial Hsp70 controls the assembly of the F 1F O-ATP synthase. Nat Commun 2023; 14:39. [PMID: 36596815 PMCID: PMC9810599 DOI: 10.1038/s41467-022-35720-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 12/20/2022] [Indexed: 01/04/2023] Open
Abstract
The mitochondrial F1FO-ATP synthase produces the bulk of cellular ATP. The soluble F1 domain contains the catalytic head that is linked via the central stalk and the peripheral stalk to the membrane embedded rotor of the FO domain. The assembly of the F1 domain and its linkage to the peripheral stalk is poorly understood. Here we show a dual function of the mitochondrial Hsp70 (mtHsp70) in the formation of the ATP synthase. First, it cooperates with the assembly factors Atp11 and Atp12 to form the F1 domain of the ATP synthase. Second, the chaperone transfers Atp5 into the assembly line to link the catalytic head with the peripheral stalk. Inactivation of mtHsp70 leads to integration of assembly-defective Atp5 variants into the mature complex, reflecting a quality control function of the chaperone. Thus, mtHsp70 acts as an assembly and quality control factor in the biogenesis of the F1FO-ATP synthase.
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Affiliation(s)
- Jiyao Song
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany.,Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Liesa Steidle
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Isabelle Steymans
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Jasjot Singh
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Anne Sanner
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Lena Böttinger
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Dominic Winter
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Thomas Becker
- Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany.
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6
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Sehgal SA, Wu H, Sajid M, Sohail S, Ahsan M, Parveen G, Riaz M, Khan MS, Iqbal MN, Malik A. Pharmacological Progress of Mitophagy Regulation. Curr Neuropharmacol 2023; 21:1026-1041. [PMID: 36918785 PMCID: PMC10286582 DOI: 10.2174/1570159x21666230314140528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 03/16/2023] Open
Abstract
With the advancement in novel drug discovery, biologically active compounds are considered pharmacological tools to understand complex biological mechanisms and the identification of potent therapeutic agents. Mitochondria boast a central role in different integral biological processes and mitochondrial dysfunction is associated with multiple pathologies. It is, therefore, prudent to target mitochondrial quality control mechanisms by using pharmacological approaches. However, there is a scarcity of biologically active molecules, which can interact with mitochondria directly. Currently, the chemical compounds used to induce mitophagy include oligomycin and antimycin A for impaired respiration and acute dissipation of mitochondrial membrane potential by using CCCP/FCCP, the mitochondrial uncouplers. These chemical probes alter the homeostasis of the mitochondria and limit our understanding of the energy regulatory mechanisms. Efforts are underway to find molecules that can bring about selective removal of defective mitochondria without compromising normal mitochondrial respiration. In this report, we have tried to summarize and status of the recently reported modulators of mitophagy.
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Affiliation(s)
- Sheikh Arslan Sehgal
- Department of Bioinformatics, The Islamia University of Bahawalpur, Bahawalpur, Punjab, Pakistan
- Department of Bioinformatics, University of Okara, Okara, Pakistan
| | - Hao Wu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, China
| | - Muhammad Sajid
- Department of Biotechnology, University of Okara, Okara, Pakistan
| | - Summar Sohail
- Department of Forestry, Kohsar University Murree, Pakistan
| | - Muhammad Ahsan
- Institute of Environmental and Agricultural Sciences, University of Okara, Okara, Punjab, Pakistan
| | | | - Mehreen Riaz
- Department of Zoology, Women University, Swabi, Pakistan
| | | | - Muhammad Nasir Iqbal
- Department of Bioinformatics, The Islamia University of Bahawalpur, Bahawalpur, Punjab, Pakistan
| | - Abbeha Malik
- Department of Bioinformatics, The Islamia University of Bahawalpur, Bahawalpur, Punjab, Pakistan
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7
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Wang X, Xu X, Zhao Y, Qi L, Ge H. Inhibition of Lonp1 induces mitochondrial remodeling and autophagy suppression in cervical cancer cells. Acta Histochem 2023; 125:151986. [PMID: 36508908 DOI: 10.1016/j.acthis.2022.151986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 12/13/2022]
Abstract
Lon protease 1(Lonp1) is an ATP-dependent protease located in the mitochondrial matrix and plays a crucial role in preserving normal mitochondrial function. Lonp1 overexpression is associated with tumorigenesis in various cancer types, including cervical cancer. In the present study, we show that the Lonp1 content is elevated in cervical cancer tissues compared to cervical paracancerous tissues. Conversely, Lonp1 knockdown suppresses cervical cancer cell proliferation, migration and invasion but promotes apoptosis. Mechanistically, Lonp1 knockdown decreases area of mitochondrial networks and induces mitochondrial depolarization. Furthermore, Lonp1 inhibition reduces the level of LC3-II/I, PINK1 and Parkin, but promotes the level of p62. Collectively, our study suggests that the anti-cancer effect caused by Lonp1 downregulation likely contributes to mitochondrial remodeling and suppression of autophagy and mitophagy.
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Affiliation(s)
- Xiaona Wang
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Xu Xu
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Yu Zhao
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Lifang Qi
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Hongshan Ge
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Department of Obstetrics and Gynecology, The Fifth Affiliated Hospital of Nantong University, Taizhou, Jiangsu Province, China.
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8
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Pareek G. AAA+ proteases: the first line of defense against mitochondrial damage. PeerJ 2022; 10:e14350. [PMID: 36389399 PMCID: PMC9648348 DOI: 10.7717/peerj.14350] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/16/2022] [Indexed: 11/09/2022] Open
Abstract
Mitochondria play essential cellular roles in Adenosine triphosphate (ATP) synthesis, calcium homeostasis, and metabolism, but these vital processes have potentially deadly side effects. The production of the reactive oxygen species (ROS) and the aggregation of misfolded mitochondrial proteins can lead to severe mitochondrial damage and even cell death. The accumulation of mitochondrial damage is strongly implicated in aging and several incurable diseases, including neurodegenerative disorders and cancer. To oppose this, metazoans utilize a variety of quality control strategies, including the degradation of the damaged mitochondrial proteins by the mitochondrial-resident proteases of the ATPase Associated with the diverse cellular Activities (AAA+) family. This mini-review focuses on the quality control mediated by the mitochondrial-resident proteases of the AAA+ family used to combat the accumulation of damaged mitochondria and on how the failure of this mitochondrial quality control contributes to diseases.
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9
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Szczepanowska K, Trifunovic A. Mitochondrial matrix proteases: quality control and beyond. FEBS J 2022; 289:7128-7146. [PMID: 33971087 DOI: 10.1111/febs.15964] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 03/22/2021] [Accepted: 05/07/2021] [Indexed: 01/13/2023]
Abstract
To ensure correct function, mitochondria have developed several mechanisms of protein quality control (QC). Protein homeostasis highly relies on chaperones and proteases to maintain proper folding and remove damaged proteins that might otherwise form cell-toxic aggregates. Besides quality control, mitochondrial proteases modulate and regulate many essential functions, such as trafficking, processing and activation of mitochondrial proteins, mitochondrial dynamics, mitophagy and apoptosis. Therefore, the impaired function of mitochondrial proteases is associated with various pathological conditions, including cancer, metabolic syndromes and neurodegenerative disorders. This review recapitulates and discusses the emerging roles of two major proteases of the mitochondrial matrix, LON and ClpXP. Although commonly acknowledge for their protein quality control role, recent advances have uncovered several highly regulated processes controlled by the LON and ClpXP connected to mitochondrial gene expression and respiratory chain function maintenance. Furthermore, both proteases have been lately recognized as potent targets for anticancer therapies, and we summarize those findings.
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Affiliation(s)
- Karolina Szczepanowska
- Institute for Mitochondrial Diseases and Aging, Medical Faculty, University of Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and Center for Molecular Medicine (CMMC), University of Cologne, Germany
| | - Aleksandra Trifunovic
- Institute for Mitochondrial Diseases and Aging, Medical Faculty, University of Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and Center for Molecular Medicine (CMMC), University of Cologne, Germany
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10
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Leite AC, Martins TS, Campos A, Costa V, Pereira C. Phosphoregulation of the ATP synthase beta subunit stimulates mitochondrial activity for G2/M progression. Adv Biol Regul 2022; 85:100905. [PMID: 36030696 DOI: 10.1016/j.jbior.2022.100905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/04/2022] [Accepted: 08/09/2022] [Indexed: 10/15/2022]
Abstract
Mitochondrial ATP synthase is a multifunctional enzyme complex involved in ATP production. We previously reported that the ATP synthase catalytic beta subunit (Atp2p in yeast) is regulated by the 2A-like protein phosphatase Sit4p, which targets Atp2p at T124/T317 impacting on ATP synthase levels and mitochondrial respiration. Here we report that Atp2-T124/T317 is also potentially regulated by Cdc5p, a polo-like mitotic kinase. Since both Cdc5p and Sit4p have established roles in cell cycle regulation, we investigated whether Atp2-T124/T317 phosphorylation was cell cycle-related. We present evidence that Atp2p levels and phosphorylation vary during cell cycle progression, with an increase at G2/M phase. Atp2-T124/T317 phosphorylation stimulates mitochondrial membrane potential, respiration and ATP levels at G2/M phase, indicating that dynamic Atp2p phosphorylation contributes to mitochondrial activity at this specific cell cycle phase. Preventing Atp2p phosphorylation delays G2/M to G1 transition, suggesting that enhanced bioenergetics at G2/M may help meet the energetic demands of cell cycle progression. However, mimicking constitutive T124/T317 phosphorylation or overexpressing Atp2p leads to mitochondrial DNA instability, indicating that reversible Atp2p phosphorylation is critical for homeostasis. These results indicate that transient phosphorylation of Atp2p, a protein at the core of the ATP production machinery, impacts on mitochondrial bioenergetics and supports cell cycle progression at G2/M.
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Affiliation(s)
- Ana Cláudia Leite
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal; IBMC - Instituto de Biologia Celular e Molecular, Universidade do Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Portugal
| | - Telma Silva Martins
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal; IBMC - Instituto de Biologia Celular e Molecular, Universidade do Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Portugal
| | - Ana Campos
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal; IBMC - Instituto de Biologia Celular e Molecular, Universidade do Porto, Portugal
| | - Vítor Costa
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal; IBMC - Instituto de Biologia Celular e Molecular, Universidade do Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Portugal
| | - Clara Pereira
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal; IBMC - Instituto de Biologia Celular e Molecular, Universidade do Porto, Portugal.
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11
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Hackett PT, Jia X, Li L, Ward DM. Posttranslational regulation of mitochondrial frataxin and identification of compounds that increase frataxin levels in Friedreich's ataxia. J Biol Chem 2022; 298:101982. [PMID: 35472330 PMCID: PMC9127368 DOI: 10.1016/j.jbc.2022.101982] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 04/18/2022] [Accepted: 04/19/2022] [Indexed: 11/18/2022] Open
Abstract
Friedreich's ataxia (FRDA) is a degenerative disease caused by a decrease in the mitochondrial protein frataxin (Fxn), which is involved in iron-sulfur cluster (ISC) synthesis. Diminutions in Fxn result in decreased ISC synthesis, increased mitochondrial iron accumulation, and impaired mitochondrial function. Here, we show that conditions that result in increased mitochondrial reactive oxygen species in yeast or mammalian cell culture give rise to increased turnover of Fxn but not of other ISC synthesis proteins. We demonstrate that the mitochondrial Lon protease is involved in Fxn degradation and that iron export through the mitochondrial metal transporter Mmt1 protects yeast Fxn from degradation. We also determined that when FRDA fibroblasts were grown in media containing elevated iron, mitochondrial reactive oxygen species increased and Fxn decreased compared to WT fibroblasts. Furthermore, we screened a library of FDA-approved compounds and identified 38 compounds that increased yeast Fxn levels, including the azole bifonazole, antiparasitic fipronil, antitumor compound dibenzoylmethane, antihypertensive 4-hydroxychalcone, and a nonspecific anion channel inhibitor 4,4-diisothiocyanostilbene-2,2-sulfonic acid. We show that top hits 4-hydroxychalcone and dibenzoylmethane increased mRNA levels of transcription factor nuclear factor erythroid 2-related factor 2 in FRDA patient-derived fibroblasts, as well as downstream antioxidant targets thioredoxin, glutathione reductase, and superoxide dismutase 2. Taken together, these findings reveal that FRDA progression may be in part due to oxidant-mediated decreases in Fxn and that some approved compounds may be effective in increasing mitochondrial Fxn in FRDA, delaying disease progression.
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Affiliation(s)
- Peter T Hackett
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Xuan Jia
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Liangtao Li
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Diane M Ward
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, Utah, USA.
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12
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Taouktsi E, Kyriakou E, Smyrniotis S, Borbolis F, Bondi L, Avgeris S, Trigazis E, Rigas S, Voutsinas GE, Syntichaki P. Organismal and Cellular Stress Responses upon Disruption of Mitochondrial Lonp1 Protease. Cells 2022; 11:cells11081363. [PMID: 35456042 PMCID: PMC9025075 DOI: 10.3390/cells11081363] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/09/2022] [Accepted: 04/14/2022] [Indexed: 02/01/2023] Open
Abstract
Cells engage complex surveillance mechanisms to maintain mitochondrial function and protein homeostasis. LonP1 protease is a key component of mitochondrial quality control and has been implicated in human malignancies and other pathological disorders. Here, we employed two experimental systems, the worm Caenorhabditis elegans and human cancer cells, to investigate and compare the effects of LONP-1/LonP1 deficiency at the molecular, cellular, and organismal levels. Deletion of the lonp-1 gene in worms disturbed mitochondrial function, provoked reactive oxygen species accumulation, and impaired normal processes, such as growth, behavior, and lifespan. The viability of lonp-1 mutants was dependent on the activity of the ATFS-1 transcription factor, and loss of LONP-1 evoked retrograde signaling that involved both the mitochondrial and cytoplasmic unfolded protein response (UPRmt and UPRcyt) pathways and ensuing diverse organismal stress responses. Exposure of worms to triterpenoid CDDO-Me, an inhibitor of human LonP1, stimulated only UPRcyt responses. In cancer cells, CDDO-Me induced key components of the integrated stress response (ISR), the UPRmt and UPRcyt pathways, and the redox machinery. However, genetic knockdown of LonP1 revealed a genotype-specific cellular response and induced apoptosis similar to CDDO-Me treatment. Overall, the mitochondrial dysfunction ensued by disruption of LonP1 elicits adaptive cytoprotective mechanisms that can inhibit cancer cell survival but diversely modulate organismal stress response and aging.
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Affiliation(s)
- Eirini Taouktsi
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
- Department of Biotechnology, Agricultural University of Athens, 11855 Athens, Greece;
| | - Eleni Kyriakou
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
| | - Stefanos Smyrniotis
- Laboratory of Molecular Carcinogenesis and Rare Disease Genetics, Institute of Biosciences and Applications, National Center for Scientific Research “Demokritos”, 15341 Athens, Greece; (S.S.); (S.A.)
| | - Fivos Borbolis
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
| | - Labrina Bondi
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
- Laboratory of Molecular Carcinogenesis and Rare Disease Genetics, Institute of Biosciences and Applications, National Center for Scientific Research “Demokritos”, 15341 Athens, Greece; (S.S.); (S.A.)
| | - Socratis Avgeris
- Laboratory of Molecular Carcinogenesis and Rare Disease Genetics, Institute of Biosciences and Applications, National Center for Scientific Research “Demokritos”, 15341 Athens, Greece; (S.S.); (S.A.)
| | - Efstathios Trigazis
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
| | - Stamatis Rigas
- Department of Biotechnology, Agricultural University of Athens, 11855 Athens, Greece;
| | - Gerassimos E. Voutsinas
- Laboratory of Molecular Carcinogenesis and Rare Disease Genetics, Institute of Biosciences and Applications, National Center for Scientific Research “Demokritos”, 15341 Athens, Greece; (S.S.); (S.A.)
- Correspondence: (G.E.V.); (P.S.); Tel.: +30-21-0650-3579 (G.E.V.); +30-21-0659-7474 (P.S.)
| | - Popi Syntichaki
- Laboratory of Molecular Genetics of Aging, Biomedical Research Foundation of the Academy of Athens, Center of Basic Research, 11527 Athens, Greece; (E.T.); (E.K.); (F.B.); (L.B.); (E.T.)
- Correspondence: (G.E.V.); (P.S.); Tel.: +30-21-0650-3579 (G.E.V.); +30-21-0659-7474 (P.S.)
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13
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Baburina Y, Krestinin R, Odinokova I, Fadeeva I, Sotnikova L, Krestinina O. The Identification of Prohibitin in the Rat Heart Mitochondria in Heart Failure. Biomedicines 2021; 9:biomedicines9121793. [PMID: 34944609 PMCID: PMC8699106 DOI: 10.3390/biomedicines9121793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 11/26/2021] [Accepted: 11/26/2021] [Indexed: 11/26/2022] Open
Abstract
Mitochondria are considered the main organelles in the cell. They play an important role in both normal and abnormal heart function. There is a supramolecular organization between the complexes of the respiratory chain (supercomplexes (SCs)), which are involved in mitochondrial respiration. Prohibitins (PHBs) participate in the regulation of oxidative phosphorylation (OXPHOS) activity and interact with some subunits of the OXPHOS complexes. In this study, we identified a protein whose level was decreased in the mitochondria of the heart in rats with heart failure. This protein was PHB. Isoproterenol (ISO) has been used as a compound to induce heart failure in rats. We observed that astaxanthin (AX) increased the content of PHB in rat heart mitochondria isolated from ISO-injected rats. Since it is known that PHB forms complexes with some mitochondrial proteins and proteins that are part of the complexes of the respiratory chain, the change in the levels of these proteins was investigated under our experimental conditions. We hypothesized that PHB may be a target for the protective action of AX.
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14
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Demasi M, Augusto O, Bechara EJH, Bicev RN, Cerqueira FM, da Cunha FM, Denicola A, Gomes F, Miyamoto S, Netto LES, Randall LM, Stevani CV, Thomson L. Oxidative Modification of Proteins: From Damage to Catalysis, Signaling, and Beyond. Antioxid Redox Signal 2021; 35:1016-1080. [PMID: 33726509 DOI: 10.1089/ars.2020.8176] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Significance: The systematic investigation of oxidative modification of proteins by reactive oxygen species started in 1980. Later, it was shown that reactive nitrogen species could also modify proteins. Some protein oxidative modifications promote loss of protein function, cleavage or aggregation, and some result in proteo-toxicity and cellular homeostasis disruption. Recent Advances: Previously, protein oxidation was associated exclusively to damage. However, not all oxidative modifications are necessarily associated with damage, as with Met and Cys protein residue oxidation. In these cases, redox state changes can alter protein structure, catalytic function, and signaling processes in response to metabolic and/or environmental alterations. This review aims to integrate the present knowledge on redox modifications of proteins with their fate and role in redox signaling and human pathological conditions. Critical Issues: It is hypothesized that protein oxidation participates in the development and progression of many pathological conditions. However, no quantitative data have been correlated with specific oxidized proteins or the progression or severity of pathological conditions. Hence, the comprehension of the mechanisms underlying these modifications, their importance in human pathologies, and the fate of the modified proteins is of clinical relevance. Future Directions: We discuss new tools to cope with protein oxidation and suggest new approaches for integrating knowledge about protein oxidation and redox processes with human pathophysiological conditions. Antioxid. Redox Signal. 35, 1016-1080.
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Affiliation(s)
- Marilene Demasi
- Laboratório de Bioquímica e Biofísica, Instituto Butantan, São Paulo, Brazil
| | - Ohara Augusto
- Departamento de Bioquímica and Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Etelvino J H Bechara
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Renata N Bicev
- Departamento de Bioquímica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Fernanda M Cerqueira
- CENTD, Centre of Excellence in New Target Discovery, Instituto Butantan, São Paulo, Brazil
| | - Fernanda M da Cunha
- Departamento de Bioquímica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Ana Denicola
- Laboratorios Fisicoquímica Biológica-Enzimología, Facultad de Ciencias, Instituto de Química Biológica, Universidad de la República, Montevideo, Uruguay
| | - Fernando Gomes
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Sayuri Miyamoto
- Departamento de Bioquímica and Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Luis E S Netto
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Lía M Randall
- Laboratorios Fisicoquímica Biológica-Enzimología, Facultad de Ciencias, Instituto de Química Biológica, Universidad de la República, Montevideo, Uruguay
| | - Cassius V Stevani
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Leonor Thomson
- Laboratorios Fisicoquímica Biológica-Enzimología, Facultad de Ciencias, Instituto de Química Biológica, Universidad de la República, Montevideo, Uruguay
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15
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Proteomic analysis demonstrates the role of the quality control protease LONP1 in mitochondrial protein aggregation. J Biol Chem 2021; 297:101134. [PMID: 34461102 PMCID: PMC8503632 DOI: 10.1016/j.jbc.2021.101134] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 08/23/2021] [Accepted: 08/26/2021] [Indexed: 11/20/2022] Open
Abstract
The mitochondrial matrix protease LONP1 is an essential part of the organellar protein quality control system. LONP1 has been shown to be involved in respiration control and apoptosis. Furthermore, a reduction in LONP1 level correlates with aging. Up to now, the effects of a LONP1 defect were mostly studied by utilizing transient, siRNA-mediated knockdown approaches. We generated a new cellular model system for studying the impact of LONP1 on mitochondrial protein homeostasis by a CRISPR/Cas-mediated genetic knockdown (gKD). These cells showed a stable reduction of LONP1 along with a mild phenotype characterized by absent morphological differences and only small negative effects on mitochondrial functions under normal culture conditions. To assess the consequences of a permanent LONP1 depletion on the mitochondrial proteome, we analyzed the alterations of protein levels by quantitative mass spectrometry, demonstrating small adaptive changes, in particular with respect to mitochondrial protein biogenesis. In an additional proteomic analysis, we determined the temperature-dependent aggregation behavior of mitochondrial proteins and its dependence on a reduction of LONP1 activity, demonstrating the important role of the protease for mitochondrial protein homeostasis in mammalian cells. We identified a significant number of mitochondrial proteins that are affected by a reduced LONP1 activity especially with respect to their stress-induced solubility. Taken together, our results suggest a very good applicability of the LONP1 gKD cell line as a model system for human aging processes.
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16
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Wang C, Wang Y, Shen L. Mitochondrial proteins in heart failure: The role of deacetylation by SIRT3. Pharmacol Res 2021; 172:105802. [PMID: 34363948 DOI: 10.1016/j.phrs.2021.105802] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 12/28/2022]
Abstract
Heart failure (HF) is still the leading cause of death worldwide, occurring with a variety of complex mechanisms. However, most intervention for HF do not directly target the pathological mechanisms underlying cell damage in failing cardiomyocytes. Mitochondria are involved in many physiological processes, which is an important guarantee for normal heart function. Mitochondrial dysfunction is considered to be the critical node of the development of HF. Strict modulation of the mitochondrial function can ameliorate the myocardial injury and protect cardiac function. Acetylation plays an important role in mitochondrial protein homeostasis, and SIRT3, the most important deacetylation protein in mitochondria, is involved in the maintenance of mitochondrial function. SIRT3 can delay the progression of HF by improving mitochondrial function. Herein we summarize the interaction between SIRT3 and proteins related to mitochondrial function including oxidative phosphorylation (OXPHOS), fatty acid oxidation (FAO), mitochondrial biosynthesis, mitochondrial quality control. In addition, we also sum up the effects of this interaction on HF and the research progress of treatments targeting SIRT3, so as to find potential HF therapeutic for clinical use in the future.
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Affiliation(s)
- Chunfang Wang
- Department of Internal Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renming Road, Changsha, Hunan 410011, PR China.
| | - Yating Wang
- Department of Internal Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renming Road, Changsha, Hunan 410011, PR China.
| | - Li Shen
- Department of Internal Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renming Road, Changsha, Hunan 410011, PR China.
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17
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Dang Y, Wei Y, Wang Y, Liu S, Julia C, Zhang SH. Cleavage of PrePL by Lon promotes growth and pathogenesis in Magnaporthe oryzae. Environ Microbiol 2020; 23:4881-4895. [PMID: 33225564 DOI: 10.1111/1462-2920.15335] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/30/2020] [Accepted: 11/19/2020] [Indexed: 11/28/2022]
Abstract
ATP-dependent Lon proteases function in bacterial pathogenesis by regulating the expression of the Type III secretion system; however, little is known about how Lon proteases regulate fungal pathogenesis. We previously investigated Lon-binding proteins involved in fungal pathogenesis that interact with PrePL, the smallest Magnaporthe oryzae Lon-binding protein. Here, we show that Lon cleaves PrePL and produces Pc, an extracellular 11-kDa isoform with catalase and peroxidase activity. The ΔPrePL loss-of-function strain showed stronger sporulation and accelerated disease development, suggesting a temporally specific negative regulatory mechanism controlled by PrePL in disease progression. Neither the truncated Pc, nor the full-length PrePL missing the Lon cleavage site complemented the ΔPrePL phenotype, suggesting that full-length PrePL and Pc both function in fungal development. PrePL targeted to the mitochondria undergoes hydrolysis by Lon to produce Pc, which accumulates in the fungal apoplast. Importantly, recombinant Pc induced plant defence responses and cell death after being infiltrated into selected plant leaves, indicating that it functions as an avirulence factor. This work thus reveals a novel pathogenic factor in the fungal Lon-mediated pathway. Additionally, our results provide new insight into the functions of a full-length protein and its cleaved isoform in fungal pathogenesis.
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Affiliation(s)
- Yuejia Dang
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Yi Wei
- College of Plant Sciences, Jilin University, Changchun, 130062, China.,College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - Yanyan Wang
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Shaoshuai Liu
- College of Plant Sciences, Jilin University, Changchun, 130062, China.,Institute of Phytopathology, Centre for BioSystems, Land Use and Nutrition, Justus Liebig University, Giessen, Heinrich Buff-Ring 26-32, D-35392, Germany
| | - Chekanova Julia
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - Shi-Hong Zhang
- College of Plant Sciences, Jilin University, Changchun, 130062, China.,College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
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18
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Leu JY, Yee J, Tu CS, Sayson S, Jou YS, Geraldino PJ. Microstructure and molecular vibration of mannosylerythritol lipids from Pseudozyma yeast strains. Chem Phys Lipids 2020; 232:104969. [PMID: 32888916 DOI: 10.1016/j.chemphyslip.2020.104969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 08/11/2020] [Accepted: 08/28/2020] [Indexed: 10/23/2022]
Abstract
This work highlights microstructure and molecular vibration of mannosylerythritol lipids (MELs) from Pseudozyma aphidis B1 and Pseudozyma hubeiensis TS18 strains collected from brown algae and mangrove sediments. The scanning electron microscopy (SEM) shows the elongated structures with polar budding in the cells of B1 and TS18 yeast strains. The high-resolution transmission electron microscopy (HRTEM) identifies large lipid bodies that contain MELs confirmed by the anthrone test and thin layer chromatography. The HRTEM also reveals unknown electron dense inclusions. The surface-enhanced Raman scattering (SERS) was used to analysis molecular vibrations of cells, MEL mixtures, and purified MELs (A, B, and C) extracted from the B1 and TS18 cells. The peak analysis of Raman spectra suggests a higher level of saturation per fatty acid chain in MEL-B in both B1 and TS18 cells. This work demonstrates that the out-of-plane bending vibrations of the CH bonds in the range of 840-940 cm-1 can serve an efficient indicator for detecting MEL-A, -B, and -C.
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Affiliation(s)
- Jyh-Yih Leu
- Department of Life Science, Fu Jen Catholic University, New Taipei City, 24205, Taiwan
| | - Jonie Yee
- Department of Biology, University of San Carlos, Cebu City, 6000, Philippines
| | - Chi-Shun Tu
- Department of Physics, Fu Jen Catholic University, New Taipei City, 24205, Taiwan; Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Stephanie Sayson
- Department of Life Science, Fu Jen Catholic University, New Taipei City, 24205, Taiwan
| | - Yi-Shin Jou
- Department of Physics, Fu Jen Catholic University, New Taipei City, 24205, Taiwan
| | - Paul John Geraldino
- Department of Biology, University of San Carlos, Cebu City, 6000, Philippines.
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19
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Hamon MP, Gergondey R, L'honoré A, Friguet B. Mitochondrial Lon protease - depleted HeLa cells exhibit proteome modifications related to protein quality control, stress response and energy metabolism. Free Radic Biol Med 2020; 148:83-95. [PMID: 31904544 DOI: 10.1016/j.freeradbiomed.2019.12.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 12/20/2022]
Abstract
The ATP-dependent Lon protease is located in the mitochondrial matrix and oxidized proteins are among its primary targets for their degradation. Impairment of mitochondrial morphology and function together with apoptosis were observed in lung fibroblasts depleted for Lon expression while accumulation of carbonylated mitochondrial proteins has been reported for yeast and HeLa Lon deficient cells. In addition, age-related mitochondrial dysfunction has been associated with an impairment of Lon expression. Using a HeLa cell line stably transfected with an inducible shRNA directed against Lon, we have previously observed that Lon depletion results in a mild phenotype characterized by an increase of both production of reactive oxygen species and level of oxidized proteins (Bayot et al., 2014, Biochimie, 100: 38-47). In this study using the same cell line, we now show that Lon knockdown leads to modifications of the expression of a number of specific proteins involved in protein quality control, stress response and energy metabolism, as evidenced using a 2D gel-based proteomic approach, and to alteration of the mitochondrial network morphology. We also show that these effects are associated with decreased proliferation and can be modulated by culture conditions in galactose versus glucose containing medium.
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Affiliation(s)
- Marie-Paule Hamon
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Aging, B2A-IBPS, F-75005, Paris, France
| | - Rachel Gergondey
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Aging, B2A-IBPS, F-75005, Paris, France
| | - Aurore L'honoré
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Aging, B2A-IBPS, F-75005, Paris, France
| | - Bertrand Friguet
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Aging, B2A-IBPS, F-75005, Paris, France.
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20
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The Mitochondrial Lon Protease: Novel Functions off the Beaten Track? Biomolecules 2020; 10:biom10020253. [PMID: 32046155 PMCID: PMC7072132 DOI: 10.3390/biom10020253] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 12/11/2022] Open
Abstract
To maintain organellar function, mitochondria contain an elaborate endogenous protein quality control system. As one of the two soluble energy-dependent proteolytic enzymes in the matrix compartment, the protease Lon is a major component of this system, responsible for the degradation of misfolded proteins, in particular under oxidative stress conditions. Lon defects have been shown to negatively affect energy production by oxidative phosphorylation but also mitochondrial gene expression. In this review, recent studies on the role of Lon in mammalian cells, in particular on its protective action under diverse stress conditions and its relationship to important human diseases are summarized and commented.
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21
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Venkatesh S, Suzuki CK. Cell stress management by the mitochondrial LonP1 protease - Insights into mitigating developmental, oncogenic and cardiac stress. Mitochondrion 2019; 51:46-61. [PMID: 31756517 DOI: 10.1016/j.mito.2019.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 09/24/2019] [Accepted: 10/02/2019] [Indexed: 11/15/2022]
Abstract
Mitochondrial LonP1 is an essential stress response protease that mediates mitochondrial proteostasis, metabolism and bioenergetics. Homozygous and compound heterozygous variants in the LONP1 gene encoding the LonP1 protease have recently been shown to cause a diverse spectrum of human pathologies, ranging from classical mitochondrial disease phenotypes, profound neurologic impairment and multi-organ dysfunctions, some of which are uncommon to mitochondrial disorders. In this review, we focus primarily on human LonP1 and discuss findings, which demonstrate its multidimensional roles in maintaining mitochondrial proteostasis and adapting cells to metabolic flux and stress during normal physiology and disease processes. We also discuss emerging roles of LonP1 in responding to developmental, oncogenic and cardiac stress.
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Affiliation(s)
- Sundararajan Venkatesh
- Department of Microbiology, Biochemistry & Molecular Genetics, New Jersey Medical School - Rutgers, The State University of New Jersey, Newark, NJ, USA.
| | - Carolyn K Suzuki
- Department of Microbiology, Biochemistry & Molecular Genetics, New Jersey Medical School - Rutgers, The State University of New Jersey, Newark, NJ, USA.
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22
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Vazquez-Calvo C, Suhm T, Büttner S, Ott M. The basic machineries for mitochondrial protein quality control. Mitochondrion 2019; 50:121-131. [PMID: 31669238 DOI: 10.1016/j.mito.2019.10.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 09/10/2019] [Accepted: 10/02/2019] [Indexed: 11/16/2022]
Abstract
Mitochondria play pivotal roles in cellular energy metabolism, the synthesis of essential biomolecules and the regulation of cell death and aging. The proper folding, unfolding and degradation of the many proteins active within mitochondria is surveyed by the mitochondrial quality control machineries. Here, we describe the principal components of the mitochondrial quality control system and recent developments in the elucidation of the molecular mechanisms maintaining a functional mitochondrial proteome.
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Affiliation(s)
- Carmela Vazquez-Calvo
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrheniusväg 16, Stockholm 106 91, Sweden; Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Svante Arrheniusväg 20C, Stockholm 106 91, Sweden
| | - Tamara Suhm
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrheniusväg 16, Stockholm 106 91, Sweden
| | - Sabrina Büttner
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Svante Arrheniusväg 20C, Stockholm 106 91, Sweden; Institute of Molecular Biosciences, University of Graz, Humboldtstraße 50, Graz 8010, Austria.
| | - Martin Ott
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrheniusväg 16, Stockholm 106 91, Sweden.
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23
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Göke A, Schrott S, Mizrak A, Belyy V, Osman C, Walter P. Mrx6 regulates mitochondrial DNA copy number in Saccharomyces cerevisiae by engaging the evolutionarily conserved Lon protease Pim1. Mol Biol Cell 2019; 31:527-545. [PMID: 31532710 PMCID: PMC7202074 DOI: 10.1091/mbc.e19-08-0470] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Mitochondrial function depends crucially on the maintenance of multiple mitochondrial DNA (mtDNA) copies. Surprisingly, the cellular mechanisms regulating mtDNA copy number remain poorly understood. Through a systematic high-throughput approach in Saccharomyces cerevisiae, we determined mtDNA–to–nuclear DNA ratios in 5148 strains lacking nonessential genes. The screen revealed MRX6, a largely uncharacterized gene, whose deletion resulted in a marked increase in mtDNA levels, while maintaining wild type–like mitochondrial structure and cell size. Quantitative superresolution imaging revealed that deletion of MRX6 alters both the size and the spatial distribution of mtDNA nucleoids. We demonstrate that Mrx6 partially colocalizes with mtDNA within mitochondria and interacts with the conserved Lon protease Pim1 in a complex that also includes Mam33 and the Mrx6-related protein Pet20. Acute depletion of Pim1 phenocopied the high mtDNA levels observed in Δmrx6 cells. No further increase in mtDNA copy number was observed upon depletion of Pim1 in Δmrx6 cells, revealing an epistatic relationship between Pim1 and Mrx6. Human and bacterial Lon proteases regulate DNA replication by degrading replication initiation factors, suggesting a model in which Pim1 acts similarly with the Mrx6 complex, providing a scaffold linking it to mtDNA.
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Affiliation(s)
- Aylin Göke
- Howard Hughes Medical Institute and Department of Biochemistry and Biophysics and
| | - Simon Schrott
- Faculty of Biology, Ludwig-Maximilian-Universität München, 82152 Planegg-Martinsried, Germany
| | - Arda Mizrak
- Department of Physiology, University of California, San Francisco, San Francisco, CA 94143
| | - Vladislav Belyy
- Howard Hughes Medical Institute and Department of Biochemistry and Biophysics and
| | - Christof Osman
- Howard Hughes Medical Institute and Department of Biochemistry and Biophysics and.,Faculty of Biology, Ludwig-Maximilian-Universität München, 82152 Planegg-Martinsried, Germany
| | - Peter Walter
- Howard Hughes Medical Institute and Department of Biochemistry and Biophysics and
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24
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Wright JN, Benavides GA, Johnson MS, Wani W, Ouyang X, Zou L, Collins HE, Zhang J, Darley-Usmar V, Chatham JC. Acute increases in O-GlcNAc indirectly impair mitochondrial bioenergetics through dysregulation of LonP1-mediated mitochondrial protein complex turnover. Am J Physiol Cell Physiol 2019; 316:C862-C875. [PMID: 30865517 PMCID: PMC6620580 DOI: 10.1152/ajpcell.00491.2018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/19/2019] [Accepted: 03/09/2019] [Indexed: 12/26/2022]
Abstract
The attachment of O-linked β-N-acetylglucosamine (O-GlcNAc) to the serine and threonine residues of proteins in distinct cellular compartments is increasingly recognized as an important mechanism regulating cellular function. Importantly, the O-GlcNAc modification of mitochondrial proteins has been identified as a potential mechanism to modulate metabolism under stress with both potentially beneficial and detrimental effects. This suggests that temporal and dose-dependent changes in O-GlcNAcylation may have different effects on mitochondrial function. In the current study, we found that acutely augmenting O-GlcNAc levels by inhibiting O-GlcNAcase with Thiamet-G for up to 6 h resulted in a time-dependent decrease in cellular bioenergetics and decreased mitochondrial complex I, II, and IV activities. Under these conditions, mitochondrial number was unchanged, whereas an increase in the protein levels of the subunits of several electron transport complex proteins was observed. However, the observed bioenergetic changes appeared not to be due to direct increased O-GlcNAc modification of complex subunit proteins. Increases in O-GlcNAc were also associated with an accumulation of mitochondrial ubiquitinated proteins; phosphatase and tensin homolog induced kinase 1 (PINK1) and p62 protein levels were also significantly increased. Interestingly, the increase in O-GlcNAc levels was associated with a decrease in the protein levels of the mitochondrial Lon protease homolog 1 (LonP1), which is known to target complex IV subunits and PINK1, in addition to other mitochondrial proteins. These data suggest that impaired bioenergetics associated with short-term increases in O-GlcNAc levels could be due to impaired, LonP1-dependent, mitochondrial complex protein turnover.
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Affiliation(s)
- JaLessa N Wright
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Gloria A Benavides
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Michelle S Johnson
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Willayat Wani
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Xiaosen Ouyang
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Luyun Zou
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Helen E Collins
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - Jianhua Zhang
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
- Birmingham VA Medical Center, University of Alabama , Birmingham, Alabama
| | - Victor Darley-Usmar
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
| | - John C Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama , Birmingham, Alabama
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25
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Signorile A, Sgaramella G, Bellomo F, De Rasmo D. Prohibitins: A Critical Role in Mitochondrial Functions and Implication in Diseases. Cells 2019; 8:cells8010071. [PMID: 30669391 PMCID: PMC6356732 DOI: 10.3390/cells8010071] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/10/2019] [Accepted: 01/15/2019] [Indexed: 12/11/2022] Open
Abstract
Prohibitin 1 (PHB1) and prohibitin 2 (PHB2) are proteins that are ubiquitously expressed, and are present in the nucleus, cytosol, and mitochondria. Depending on the cellular localization, PHB1 and PHB2 have distinctive functions, but more evidence suggests a critical role within mitochondria. In fact, PHB proteins are highly expressed in cells that heavily depend on mitochondrial function. In mitochondria, these two proteins assemble at the inner membrane to form a supra-macromolecular structure, which works as a scaffold for proteins and lipids regulating mitochondrial metabolism, including bioenergetics, biogenesis, and dynamics in order to determine the cell fate, death, or life. PHB alterations have been found in aging and cancer, as well as neurodegenerative, cardiac, and kidney diseases, in which significant mitochondrial impairments have been observed. The molecular mechanisms by which prohibitins regulate mitochondrial function and their role in pathology are reviewed and discussed herein.
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Affiliation(s)
- Anna Signorile
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari "Aldo Moro", 70124 Bari, Italy.
| | - Giuseppe Sgaramella
- Water Research Institute (IRSA), National Research Council (CNR), Viale F. De Blasio, 5, 70132 Bari, Italy.
| | - Francesco Bellomo
- Laboratory of Nephrology, Department of Rare Diseases, Bambino Gesù Children's Hospital, Viale di S. Paolo, 15, 00149 Rome, Italy.
| | - Domenico De Rasmo
- Institute of Biomembrane, Bioenergetics and Molecular Biotechnology (IBIOM), National Research Council (CNR), 70126 Bari, Italy.
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Lon protease inactivation in Drosophila causes unfolded protein stress and inhibition of mitochondrial translation. Cell Death Discov 2018; 4:51. [PMID: 30374414 PMCID: PMC6197249 DOI: 10.1038/s41420-018-0110-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 09/11/2018] [Indexed: 12/24/2022] Open
Abstract
Mitochondrial dysfunction is a frequent participant in common diseases and a principal suspect in aging. To combat mitochondrial dysfunction, eukaryotes have evolved a large repertoire of quality control mechanisms. One such mechanism involves the selective degradation of damaged or misfolded mitochondrial proteins by mitochondrial resident proteases, including proteases of the ATPase Associated with diverse cellular Activities (AAA+) family. The importance of the AAA+ family of mitochondrial proteases is exemplified by the fact that mutations that impair their functions cause a variety of human diseases, yet our knowledge of the cellular responses to their inactivation is limited. To address this matter, we created and characterized flies with complete or partial inactivation of the Drosophila matrix-localized AAA+ protease Lon. We found that a Lon null allele confers early larval lethality and that severely reducing Lon expression using RNAi results in shortened lifespan, locomotor impairment, and respiratory defects specific to respiratory chain complexes that contain mitochondrially encoded subunits. The respiratory chain defects of Lon knockdown (LonKD) flies appeared to result from severely reduced translation of mitochondrially encoded genes. This translational defect was not a consequence of reduced mitochondrial transcription, as evidenced by the fact that mitochondrial transcripts were elevated in abundance in LonKD flies. Rather, the translational defect of LonKD flies appeared to be derived from sequestration of mitochondrially encoded transcripts in highly dense ribonucleoparticles. The translational defect of LonKD flies was also accompanied by a substantial increase in unfolded mitochondrial proteins. Together, our findings suggest that the accumulation of unfolded mitochondrial proteins triggers a stress response that culminates in the inhibition of mitochondrial translation. Our work provides a foundation to explore the underlying molecular mechanisms.
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Zurita Rendón O, Shoubridge EA. LONP1 Is Required for Maturation of a Subset of Mitochondrial Proteins, and Its Loss Elicits an Integrated Stress Response. Mol Cell Biol 2018; 38:e00412-17. [PMID: 30061372 PMCID: PMC6168981 DOI: 10.1128/mcb.00412-17] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 08/16/2017] [Accepted: 07/12/2018] [Indexed: 01/04/2023] Open
Abstract
LONP1, an AAA+ mitochondrial protease, is implicated in protein quality control, but its precise role in this process remains poorly understood. In this study, we have investigated the role of human LONP1 in mitochondrial proteostasis and gene expression. Depletion of LONP1 resulted in partial loss of mitochondrial DNA (mtDNA) and a complete suppression of mitochondrial translation associated with impaired ribosome biogenesis. The levels of a distinct subset of mitochondrial matrix proteins (SSBP1, MTERFD3, FASTKD2, and CLPX) increased in the presence of a catalytically dead form of LONP1, suggesting that they are bona fide LONP1 substrates. Unexpectedly, the unprocessed forms of the same proteins also accumulated in an insoluble protein fraction. This subset of unprocessed matrix proteins (but not their mature forms) accumulated following depletion of the mitochondrial processing peptidase MPP, though all other MPP substrates investigated were processed normally. Prolonged depletion of LONP1 produced massive matrix protein aggregates, robustly activated the integrated stress response (ISR) pathway, and resulted in stabilization of PINK1, a mitophagy marker. These results demonstrate that LONP1 and MPPαβ are together required for the maturation of a subset of LONP1 client proteins and that LONP1 activity is essential for the maintenance of mitochondrial proteostasis and gene expression.
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Affiliation(s)
- Olga Zurita Rendón
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Eric A Shoubridge
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada
- Department of Human Genetics, McGill University, Montreal, QC, Canada
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Mitochondrial Lon sequesters and stabilizes p53 in the matrix to restrain apoptosis under oxidative stress via its chaperone activity. Cell Death Dis 2018; 9:697. [PMID: 29899330 PMCID: PMC5998145 DOI: 10.1038/s41419-018-0730-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 04/20/2018] [Accepted: 05/22/2018] [Indexed: 11/30/2022]
Abstract
Mitochondrial Lon is a multi-function matrix protease with chaperone activity. However, little literature has been undertaken into detailed investigations on how Lon regulates apoptosis through its chaperone activity. Accumulating evidences indicate that various stresses induce transportation of p53 to mitochondria and activate apoptosis in a transcription-independent manner. Here we found that increased Lon interacts with p53 in mitochondrial matrix and restrains the apoptosis induced by p53 under oxidative stress by rescuing the loss of mitochondrial membrane potential (Δψm) and the release of cytochrome C and SMAC/Diablo. Increased chaperone Lon hampers the transcription-dependent apoptotic function of p53 by reducing the mRNA expression of p53 target genes. The ATPase mutant (K529R) of chaperone Lon decreases the interaction with p53 and fails to inhibit apoptosis. Furthermore, the chaperone activity of Lon is important for mitochondrial p53 accumulation in an mtHsp70-dependent manner, which is also important to prevent the cytosolic distribution of p53 from proteasome-dependent degradation. These results indicate that the chaperone activity of Lon is important to bind with mitochondrial p53 by which increased Lon suppresses the apoptotic function of p53 under oxidative stress. Furthermore, mitochondrial Lon-mtHsp70 increases the stability/level of p53 through trafficking and retaining p53 in mitochondrial matrix and preventing the pool of cytosolic p53 from proteasome-dependent degradation in vitro and in clinic.
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Bruderek M, Jaworek W, Wilkening A, Rüb C, Cenini G, Förtsch A, Sylvester M, Voos W. IMiQ: a novel protein quality control compartment protecting mitochondrial functional integrity. Mol Biol Cell 2017; 29:256-269. [PMID: 29212875 PMCID: PMC5996957 DOI: 10.1091/mbc.e17-01-0027] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 11/27/2017] [Accepted: 12/01/2017] [Indexed: 01/09/2023] Open
Abstract
Aggregation processes can cause severe perturbations of cellular homeostasis and are frequently associated with diseases. We performed a comprehensive analysis of mitochondrial quality and function in the presence of aggregation-prone polypeptides. Despite a significant aggregate formation inside mitochondria, we observed only a minor impairment of mitochondrial function. Detoxification of aggregated reporter polypeptides as well as misfolded endogenous proteins inside mitochondria takes place via their sequestration into a specific organellar deposit site we termed intramitochondrial protein quality control compartment (IMiQ). Only minor amounts of endogenous proteins coaggregated with IMiQ deposits and neither resolubilization nor degradation by the mitochondrial protein quality control system were observed. The single IMiQ aggregate deposit was not transferred to daughter cells during cell division. Detoxification of aggregates via IMiQ formation was highly dependent on a functional mitochondrial fission machinery. We conclude that the formation of an aggregate deposit is an important mechanism to maintain full functionality of mitochondria under proteotoxic stress conditions.
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Affiliation(s)
- Michael Bruderek
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Witold Jaworek
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Anne Wilkening
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Cornelia Rüb
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Giovanna Cenini
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Arion Förtsch
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Marc Sylvester
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
| | - Wolfgang Voos
- Institut für Biochemie und Molekularbiologie, Universität Bonn, 53115 Bonn, Germany
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Oxidised protein metabolism: recent insights. Biol Chem 2017; 398:1165-1175. [DOI: 10.1515/hsz-2017-0124] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 05/17/2017] [Indexed: 12/14/2022]
Abstract
Abstract
The ‘oxygen paradox’ arises from the fact that oxygen, the molecule that aerobic life depends on, threatens its very existence. An oxygen-rich environment provided life on Earth with more efficient bioenergetics and, with it, the challenge of having to deal with a host of oxygen-derived reactive species capable of damaging proteins and other crucial cellular components. In this minireview, we explore recent insights into the metabolism of proteins that have been reversibly or irreversibly damaged by oxygen-derived species. We discuss recent data on the important roles played by the proteasomal and lysosomal systems in the proteolytic degradation of oxidatively damaged proteins and the effects of oxidative damage on the function of the proteolytic pathways themselves. Mitochondria are central to oxygen utilisation in the cell, and their ability to handle oxygen-derived radicals is an important and still emerging area of research. Current knowledge of the proteolytic machinery in the mitochondria, including the ATP-dependent AAA+ proteases and mitochondrial-derived vesicles, is also highlighted in the review. Significant progress is still being made in regard to understanding the mechanisms underlying the detection and degradation of oxidised proteins and how proteolytic pathways interact with each other. Finally, we highlight a few unanswered questions such as the possibility of oxidised amino acids released from oxidised proteins by proteolysis being re-utilised in protein synthesis thus establishing a vicious cycle of oxidation in cells.
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Bulteau AL, Mena NP, Auchère F, Lee I, Prigent A, Lobsiger CS, Camadro JM, Hirsch EC. Dysfunction of mitochondrial Lon protease and identification of oxidized protein in mouse brain following exposure to MPTP: Implications for Parkinson disease. Free Radic Biol Med 2017; 108:236-246. [PMID: 28365360 DOI: 10.1016/j.freeradbiomed.2017.03.036] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 03/19/2017] [Accepted: 03/22/2017] [Indexed: 10/19/2022]
Abstract
Compelling evidence suggests that mitochondrial dysfunction leading to reactive oxygen species (ROS) production and protein oxidation could represent a critical event in the pathogenesis of Parkinson's disease (PD). Pioneering studies have shown that the mitochondrial matrix contains the Lon protease, which degrades oxidized, dysfunctional, and misfolded protein. Using the PD animal model of 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) intoxication in mice, we showed that Lon protease expression increased in the ventral mesencephalon of intoxicated animals, concomitantly with the appearance of oxidized proteins and dopaminergic cell loss. In addition, we report that Lon is inactivated by ROS. Moreover, proteomic experiments provide evidence of carbonylation in α-ketoglutarate dehydrogenase (KGDH), aconitase or subunits of respiratory chain complexes. Lon protease inactivation upon MPTP treatment in mice raises the possibility that Lon protease dysfunction is an early event in the pathogenesis of PD.
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Affiliation(s)
- Anne-Laure Bulteau
- INSERM, U1127, The Brain and Spinal Cord Institute (ICM), Hôpital de la Salpêtrière, 75013 Paris, France; CNRS, UMR 7225, Centre de Recherche en neurosciences, ICM, Thérapeutique expérimentale de la neurodégénérescence, Hôpital de la Salpêtrière, Paris, F-75005 Paris, France; Sorbonne Universités, Université Pierre et Marie Curie, 75005 Paris, France.
| | - Natalia P Mena
- INSERM, U1127, The Brain and Spinal Cord Institute (ICM), Hôpital de la Salpêtrière, 75013 Paris, France; CNRS, UMR 7225, Centre de Recherche en neurosciences, ICM, Thérapeutique expérimentale de la neurodégénérescence, Hôpital de la Salpêtrière, Paris, F-75005 Paris, France; Sorbonne Universités, Université Pierre et Marie Curie, 75005 Paris, France; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile; Millennium Institute of Cell Dynamics and Biotechnology, Santiago, Chile
| | - Françoise Auchère
- Laboratoire Mitochondries, Métaux et Stress Oxydatif, Département de Pathologie Moléculaire et Cellulaire, Institut Jacques Monod, Université Paris-Diderot/CNRS, Paris, France
| | - Irene Lee
- Case Western Reserve University Department of Chemistry, Cleveland, OH 44106, USA
| | - Annick Prigent
- INSERM, U1127, The Brain and Spinal Cord Institute (ICM), Hôpital de la Salpêtrière, 75013 Paris, France; CNRS, UMR 7225, Centre de Recherche en neurosciences, ICM, Thérapeutique expérimentale de la neurodégénérescence, Hôpital de la Salpêtrière, Paris, F-75005 Paris, France; Sorbonne Universités, Université Pierre et Marie Curie, 75005 Paris, France
| | - Christian S Lobsiger
- INSERM, U1127, The Brain and Spinal Cord Institute (ICM), Hôpital de la Salpêtrière, 75013 Paris, France; CNRS, UMR 7225, Centre de Recherche en neurosciences, ICM, Thérapeutique expérimentale de la neurodégénérescence, Hôpital de la Salpêtrière, Paris, F-75005 Paris, France; Sorbonne Universités, Université Pierre et Marie Curie, 75005 Paris, France
| | - Jean-Michel Camadro
- Laboratoire Mitochondries, Métaux et Stress Oxydatif, Département de Pathologie Moléculaire et Cellulaire, Institut Jacques Monod, Université Paris-Diderot/CNRS, Paris, France
| | - Etienne C Hirsch
- INSERM, U1127, The Brain and Spinal Cord Institute (ICM), Hôpital de la Salpêtrière, 75013 Paris, France; CNRS, UMR 7225, Centre de Recherche en neurosciences, ICM, Thérapeutique expérimentale de la neurodégénérescence, Hôpital de la Salpêtrière, Paris, F-75005 Paris, France; Sorbonne Universités, Université Pierre et Marie Curie, 75005 Paris, France.
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32
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Protein quality control at the mitochondrion. Essays Biochem 2017; 60:213-225. [PMID: 27744337 DOI: 10.1042/ebc20160009] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/31/2016] [Indexed: 12/17/2022]
Abstract
Mitochondria are essential constituents of a eukaryotic cell by supplying ATP and contributing to many mayor metabolic processes. As endosymbiotic organelles, they represent a cellular subcompartment exhibiting many autonomous functions, most importantly containing a complete endogenous machinery responsible for protein expression, folding and degradation. This article summarizes the biochemical processes and the enzymatic components that are responsible for maintaining mitochondrial protein homoeostasis. As mitochondria lack a large part of the required genetic information, most proteins are synthesized in the cytosol and imported into the organelle. After reaching their destination, polypeptides must fold and assemble into active proteins. Under pathological conditions, mitochondrial proteins become misfolded or damaged and need to be repaired with the help of molecular chaperones or eventually removed by specific proteases. Failure of these protein quality control mechanisms results in loss of mitochondrial function and structural integrity. Recently, novel mechanisms have been identified that support mitochondrial quality on the organellar level. A mitochondrial unfolded protein response allows the adaptation of chaperone and protease activities. Terminally damaged mitochondria may be removed by a variation of autophagy, termed mitophagy. An understanding of the role of protein quality control in mitochondria is highly relevant for many human pathologies, in particular neurodegenerative diseases.
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33
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Cui X, Wei Y, Xie XL, Chen LN, Zhang SH. Mitochondrial and peroxisomal Lon proteases play opposing roles in reproduction and growth but co-function in the normal development, stress resistance and longevity of Thermomyces lanuginosus. Fungal Genet Biol 2017; 103:42-54. [DOI: 10.1016/j.fgb.2017.04.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/21/2017] [Accepted: 04/09/2017] [Indexed: 01/08/2023]
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The role of Lon-mediated proteolysis in the dynamics of mitochondrial nucleic acid-protein complexes. Sci Rep 2017; 7:631. [PMID: 28377575 PMCID: PMC5428876 DOI: 10.1038/s41598-017-00632-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 03/07/2017] [Indexed: 11/15/2022] Open
Abstract
Mitochondrial nucleoids consist of several different groups of proteins, many of which are involved in essential cellular processes such as the replication, repair and transcription of the mitochondrial genome. The eukaryotic, ATP-dependent protease Lon is found within the central nucleoid region, though little is presently known about its role there. Aside from its association with mitochondrial nucleoids, human Lon also specifically interacts with RNA. Recently, Lon was shown to regulate TFAM, the most abundant mtDNA structural factor in human mitochondria. To determine whether Lon also regulates other mitochondrial nucleoid- or ribosome-associated proteins, we examined the in vitro digestion profiles of the Saccharomyces cerevisiae TFAM functional homologue Abf2, the yeast mtDNA maintenance protein Mgm101, and two human mitochondrial proteins, Twinkle helicase and the large ribosomal subunit protein MrpL32. Degradation of Mgm101 was also verified in vivo in yeast mitochondria. These experiments revealed that all four proteins are actively degraded by Lon, but that three of them are protected from it when bound to a nucleic acid; the Twinkle helicase is not. Such a regulatory mechanism might facilitate dynamic changes to the mitochondrial nucleoid, which are crucial for conducting mitochondrial functions and maintaining mitochondrial homeostasis.
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Li L, Nelson C, Fenske R, Trösch J, Pružinská A, Millar AH, Huang S. Changes in specific protein degradation rates in Arabidopsis thaliana reveal multiple roles of Lon1 in mitochondrial protein homeostasis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 89:458-471. [PMID: 27726214 DOI: 10.1111/tpj.13392] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 09/29/2016] [Accepted: 10/03/2016] [Indexed: 05/20/2023]
Abstract
Mitochondrial Lon1 loss impairs oxidative phosphorylation complexes and TCA enzymes and causes accumulation of specific mitochondrial proteins. Analysis of over 400 mitochondrial protein degradation rates using 15 N labelling showed that 205 were significantly different between wild type (WT) and lon1-1. Those proteins included ribosomal proteins, electron transport chain subunits and TCA enzymes. For respiratory complexes I and V, decreased protein abundance correlated with higher degradation rate of subunits in total mitochondrial extracts. After blue native separation, however, the assembled complexes had slow degradation, while smaller subcomplexes displayed rapid degradation in lon1-1. In insoluble fractions, a number of TCA enzymes were more abundant but the proteins degraded slowly in lon1-1. In soluble protein fractions, TCA enzymes were less abundant but degraded more rapidly. These observations are consistent with the reported roles of Lon1 as a chaperone aiding the proper folding of newly synthesized/imported proteins to stabilise them and as a protease to degrade mitochondrial protein aggregates. HSP70, prohibitin and enzymes of photorespiration accumulated in lon1-1 and degraded slowly in all fractions, indicating an important role of Lon1 in their clearance from the proteome.
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Affiliation(s)
- Lei Li
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - Clark Nelson
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - Ricarda Fenske
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - Josua Trösch
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - Adriana Pružinská
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - A Harvey Millar
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
| | - Shaobai Huang
- ARC Centre of Excellence in Plant Energy Biology, Bayliss Building M316, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Western Australia, Australia
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Smakowska E, Skibior-Blaszczyk R, Czarna M, Kolodziejczak M, Kwasniak-Owczarek M, Parys K, Funk C, Janska H. Lack of FTSH4 Protease Affects Protein Carbonylation, Mitochondrial Morphology, and Phospholipid Content in Mitochondria of Arabidopsis: New Insights into a Complex Interplay. PLANT PHYSIOLOGY 2016; 171:2516-35. [PMID: 27297677 PMCID: PMC4972270 DOI: 10.1104/pp.16.00370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 06/06/2016] [Indexed: 05/04/2023]
Abstract
FTSH4 is one of the inner membrane-embedded ATP-dependent metalloproteases in mitochondria of Arabidopsis (Arabidopsis thaliana). In mutants impaired to express FTSH4, carbonylated proteins accumulated and leaf morphology was altered when grown under a short-day photoperiod, at 22°C, and a long-day photoperiod, at 30°C. To provide better insight into the function of FTSH4, we compared the mitochondrial proteomes and oxyproteomes of two ftsh4 mutants and wild-type plants grown under conditions inducing the phenotypic alterations. Numerous proteins from various submitochondrial compartments were observed to be carbonylated in the ftsh4 mutants, indicating a widespread oxidative stress. One of the reasons for the accumulation of carbonylated proteins in ftsh4 was the limited ATP-dependent proteolytic capacity of ftsh4 mitochondria, arising from insufficient ATP amount, probably as a result of an impaired oxidative phosphorylation (OXPHOS), especially complex V. In ftsh4, we further observed giant, spherical mitochondria coexisting among normal ones. Both effects, the increased number of abnormal mitochondria and the decreased stability/activity of the OXPHOS complexes, were probably caused by the lower amount of the mitochondrial membrane phospholipid cardiolipin. We postulate that the reduced cardiolipin content in ftsh4 mitochondria leads to perturbations within the OXPHOS complexes, generating more reactive oxygen species and less ATP, and to the deregulation of mitochondrial dynamics, causing in consequence the accumulation of oxidative damage.
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Affiliation(s)
- Elwira Smakowska
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Renata Skibior-Blaszczyk
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Malgorzata Czarna
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Marta Kolodziejczak
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Malgorzata Kwasniak-Owczarek
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Katarzyna Parys
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Christiane Funk
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
| | - Hanna Janska
- Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland (E.S., R.S.-B, M.C., M.K., M.K.-O., K.P., H.J.); andDepartment of Chemistry, Umeå University, 901 87 Umea, Sweden (C.F.)
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Pinti M, Gibellini L, Nasi M, De Biasi S, Bortolotti CA, Iannone A, Cossarizza A. Emerging role of Lon protease as a master regulator of mitochondrial functions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:1300-1306. [PMID: 27033304 DOI: 10.1016/j.bbabio.2016.03.025] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 03/23/2016] [Accepted: 03/24/2016] [Indexed: 11/29/2022]
Abstract
Lon protease is a nuclear-encoded, mitochondrial ATP-dependent protease highly conserved throughout the evolution, crucial for the maintenance of mitochondrial homeostasis. Lon acts as a chaperone of misfolded proteins, and is necessary for maintaining mitochondrial DNA. The impairment of these functions has a deep impact on mitochondrial functionality and morphology. An altered expression of Lon leads to a profound reprogramming of cell metabolism, with a switch from respiration to glycolysis, which is often observed in cancer cells. Mutations of Lon, which likely impair its chaperone properties, are at the basis of a genetic inherited disease named of the cerebral, ocular, dental, auricular, skeletal (CODAS) syndrome. This article is part of a Special Issue entitled 'EBEC 2016: 19th European Bioenergetics Conference, Riva del Garda, Italy, July 2-6, 2016', edited by Prof. Paolo Bernardi.
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Affiliation(s)
- Marcello Pinti
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Lara Gibellini
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Milena Nasi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Sara De Biasi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | | | - Anna Iannone
- Department of Diagnostics, Clinical and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Andrea Cossarizza
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy.
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Ciesielski SJ, Schilke B, Marszalek J, Craig EA. Protection of scaffold protein Isu from degradation by the Lon protease Pim1 as a component of Fe-S cluster biogenesis regulation. Mol Biol Cell 2016; 27:1060-8. [PMID: 26842892 PMCID: PMC4814215 DOI: 10.1091/mbc.e15-12-0815] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 01/25/2016] [Indexed: 01/04/2023] Open
Abstract
Fe–S clusters are built on and transferred from the scaffold Isu. Isu is a substrate of Lon protease. Binding Nfs1, the sulfur donor for cluster assembly, or Jac1, the protein initiating cluster transfer, protects Isu from degradation. Such protection increases Isu levels, likely serving to rapidly up-regulate cellular Fe–S cluster biogenesis capacity. Iron–sulfur (Fe–S) clusters, essential protein cofactors, are assembled on the mitochondrial scaffold protein Isu and then transferred to recipient proteins via a multistep process in which Isu interacts sequentially with multiple protein factors. This pathway is in part regulated posttranslationally by modulation of the degradation of Isu, whose abundance increases >10-fold upon perturbation of the biogenesis process. We tested a model in which direct interaction with protein partners protects Isu from degradation by the mitochondrial Lon-type protease. Using purified components, we demonstrated that Isu is indeed a substrate of the Lon-type protease and that it is protected from degradation by Nfs1, the sulfur donor for Fe–S cluster assembly, as well as by Jac1, the J-protein Hsp70 cochaperone that functions in cluster transfer from Isu. Nfs1 and Jac1 variants known to be defective in interaction with Isu were also defective in protecting Isu from degradation. Furthermore, overproduction of Jac1 protected Isu from degradation in vivo, as did Nfs1. Taken together, our results lead to a model of dynamic interplay between a protease and protein factors throughout the Fe–S cluster assembly and transfer process, leading to up-regulation of Isu levels under conditions when Fe–S cluster biogenesis does not meet cellular demands.
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Affiliation(s)
- Szymon J Ciesielski
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706
| | - Brenda Schilke
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706
| | - Jaroslaw Marszalek
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706 Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk 80307, Poland
| | - Elizabeth A Craig
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706
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Pinti M, Gibellini L, Liu Y, Xu S, Lu B, Cossarizza A. Mitochondrial Lon protease at the crossroads of oxidative stress, ageing and cancer. Cell Mol Life Sci 2015; 72:4807-24. [PMID: 26363553 PMCID: PMC11113732 DOI: 10.1007/s00018-015-2039-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 09/01/2015] [Accepted: 09/07/2015] [Indexed: 11/26/2022]
Abstract
Lon protease is a nuclear DNA-encoded mitochondrial enzyme highly conserved throughout evolution, involved in the degradation of damaged and oxidized proteins of the mitochondrial matrix, in the correct folding of proteins imported in mitochondria, and in the maintenance of mitochondrial DNA. Lon expression is induced by various stimuli, including hypoxia and reactive oxygen species, and provides protection against cell stress. Lon down-regulation is associated with ageing and with cell senescence, while up-regulation is observed in tumour cells, and is correlated with a more aggressive phenotype of cancer. Lon up-regulation contributes to metabolic reprogramming observed in cancer, favours the switch from a respiratory to a glycolytic metabolism, helping cancer cell survival in the tumour microenvironment, and contributes to epithelial to mesenchymal transition. Silencing of Lon, or pharmacological inhibition of its activity, causes cell death in various cancer cells. Thus, Lon can be included in the growing class of proteins that are not responsible for oncogenic transformation, but that are essential for survival and proliferation of cancer cells, and that can be considered as a new target for development of anticancer drugs.
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Affiliation(s)
- Marcello Pinti
- Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi, 287, 41125, Modena, Italy.
| | - Lara Gibellini
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Yongzhang Liu
- School of Life Sciences, Institute of Biophysics, Attardi Institute of Mitochondrial Biomedicine and Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Shan Xu
- School of Life Sciences, Institute of Biophysics, Attardi Institute of Mitochondrial Biomedicine and Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Bin Lu
- School of Life Sciences, Institute of Biophysics, Attardi Institute of Mitochondrial Biomedicine and Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Andrea Cossarizza
- Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy
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Cui X, Wei Y, Wang YH, Li J, Wong FL, Zheng YJ, Yan H, Liu SS, Liu JL, Jia BL, Zhang SH. Proteins interacting with mitochondrial ATP-dependent Lon protease (MAP1) in Magnaporthe oryzae are involved in rice blast disease. MOLECULAR PLANT PATHOLOGY 2015; 16:847-859. [PMID: 25605006 PMCID: PMC6638408 DOI: 10.1111/mpp.12242] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ATP-dependent Lon protease is involved in many physiological processes. In bacteria, Lon regulates pathogenesis and, in yeast, Lon protects mitochondia from oxidative damage. However, little is known about Lon in fungal phytopathogens. MAP1, a homologue of Lon in Magnaporthe oryzae, was recently identified to be important for stress resistance and pathogenesis. Here, we focus on a novel pathogenic pathway mediated by MAP1. Based on an interaction system between rice and a tandem affinity purification (TAP)-tagged MAP1 complementation strain, we identified 23 novel fungal proteins from infected leaves using a TAP approach with mass spectrometry, and confirmed that 14 of these proteins physically interact with MAP1 in vivo. Among these 14 proteins, 11 candidates, presumably localized to the mitochondria, were biochemically determined to be substrates of MAP1 hydrolysis. Deletion mutants were created and functionally analysed to further confirm the involvement of these proteins in pathogenesis. The results indicated that all mutants showed reduced conidiation and sensitivity to hydrogen peroxide. Appressorial formations were not affected, although conidia from certain mutants were morphologically altered. In addition, virulence was reduced in four mutants, enhanced (with lesions forming earlier) in two mutants and remained unchanged in one mutant. Together with the known virulence-related proteins alternative oxidase and enoyl-CoA hydratase, we propose that most of the Lon-interacting proteins are involved in the pathogenic regulation pathway mediated by MAP1 in M. oryzae. Perturbation of this pathway may represent an effective approach for the inhibition of rice blast disease.
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Affiliation(s)
- Xiao Cui
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Yi Wei
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Yu-Han Wang
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Jian Li
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Fuk-Ling Wong
- Department of Biology, The Chinese University of Hong Kong, 999077, Hong Kong SAR
| | - Ya-Jie Zheng
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Hai Yan
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Shao-Shuai Liu
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Jin-Liang Liu
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Bao-Lei Jia
- College of Plant Sciences, Jilin University, Changchun, 130062, China
| | - Shi-Hong Zhang
- College of Plant Sciences, Jilin University, Changchun, 130062, China
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Mitochondrial proteases and protein quality control in ageing and longevity. Ageing Res Rev 2015; 23:56-66. [PMID: 25578288 DOI: 10.1016/j.arr.2014.12.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/23/2014] [Accepted: 12/27/2014] [Indexed: 11/23/2022]
Abstract
Mitochondria have been implicated in the ageing process and the lifespan modulation of model organisms. Mitochondria are the main providers of energy in eukaryotic cells but also represent both a major source of reactive oxygen species and targets for protein oxidative damage. Since protein damage can impair mitochondrial function, mitochondrial proteases are critically important for protein maintenance and elimination of oxidized protein. In the mitochondrial matrix, protein quality control is mainly achieved by the Lon and Clp proteases which are also key players in damaged mitochondrial proteins degradation. Accumulation of damaged macromolecules resulting from oxidative stress and failure of protein maintenance constitutes a hallmark of cellular and organismal ageing and is believed to participate to the age-related decline of cellular function. Hence, age-related impairment of mitochondrial protein quality control may therefore contribute to the age-associated build-up of oxidized protein and alterations of mitochondrial redox and protein homeostasis.
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Goto-Yamada S, Mano S, Yamada K, Oikawa K, Hosokawa Y, Hara-Nishimura I, Nishimura M. Dynamics of the Light-Dependent Transition of Plant Peroxisomes. PLANT & CELL PHYSIOLOGY 2015; 56:1264-71. [PMID: 26063394 DOI: 10.1093/pcp/pcv081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 05/29/2015] [Indexed: 05/21/2023]
Abstract
Peroxisomes are present in almost all plant cells. These organelles are involved in various metabolic processes, such as lipid catabolism and photorespiration. A notable feature of plant peroxisomes is their flexible adaptive responses to environmental conditions such as light. When plants shift from heterotrophic to autotrophic growth during the post-germinative stage, peroxisomes undergo a dynamic response, i.e. enzymes involved in lipid catabolism are replaced with photorespiratory enzymes. Although the detailed molecular mechanisms underlying the functional transition of peroxisomes have previously been unclear, recent analyses at the cellular level have enabled this detailed machinery to be characterized. During the functional transition, obsolete enzymes are degraded inside peroxisomes by Lon protease, while newly synthesized enzymes are transported into peroxisomes. In parallel, mature and oxidized peroxisomes are eliminated via autophagy; this functional transition occurs in an efficient manner. Moreover, it has become clear that quality control mechanisms are important for the peroxisomal response to environmental stimuli. In this review, we highlight recent advances in elucidating the molecular mechanisms required for the regulation of peroxisomal roles in response to changes in environmental conditions.
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Affiliation(s)
| | - Shoji Mano
- Laboratory of Biological Diversity, Department of Evolutionary Biology and Biodiversity, National Institute for Basic Biology, Okazaki, 444-8585 Japan Department of Basic Biology, School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, 444-8585 Japan
| | - Kenji Yamada
- Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan
| | - Kazusato Oikawa
- Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata, 950-2181 Japan
| | - Yoichiroh Hosokawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, 630-0192 Japan
| | | | - Mikio Nishimura
- Department of Cell Biology, National Institute for Basic Biology, Okazaki, 444-8585 Japan Present address: Research Enhancement Strategy Office, National Institute for Basic Biology, Okazaki, 444-8585 Japan.
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Hyzewicz J, Tanihata J, Kuraoka M, Ito N, Miyagoe-Suzuki Y, Takeda S. Low intensity training of mdx mice reduces carbonylation and increases expression levels of proteins involved in energy metabolism and muscle contraction. Free Radic Biol Med 2015; 82:122-36. [PMID: 25660994 DOI: 10.1016/j.freeradbiomed.2015.01.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 01/01/2023]
Abstract
High intensity training induces muscle damage in dystrophin-deficient mdx mice, an animal model for Duchenne muscular dystrophy. However, low intensity training (LIT) rescues the mdx phenotype and even reduces the level of protein carbonylation, a marker of oxidative damage. Until now, beneficial effects of LIT were mainly assessed at the physiological level. We investigated the effects of LIT at the molecular level on 8-week-old wild-type and mdx muscle using 2D Western blot and protein-protein interaction analysis. We found that the fast isoforms of troponin T and myosin binding protein C as well as glycogen phosphorylase were overcarbonylated and downregulated in mdx muscle. Some of the mitochondrial enzymes of the citric acid cycle were overcarbonylated, whereas some proteins of the respiratory chain were downregulated. Of functional importance, ATP synthase was only partially assembled, as revealed by Blue Native PAGE analysis. LIT decreased the carbonylation level and increased the expression of fast isoforms of troponin T and of myosin binding protein C, and glycogen phosphorylase. In addition, it increased the expression of aconitate hydratase and NADH dehydrogenase, and fully restored the ATP synthase complex. Our study demonstrates that the benefits of LIT are associated with lowered oxidative damage as revealed by carbonylation and higher expression of proteins involved in energy metabolism and muscle contraction. Potentially, these results will help to design therapies for DMD based on exercise mimicking drugs.
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Affiliation(s)
- Janek Hyzewicz
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan
| | - Jun Tanihata
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan
| | - Mutsuki Kuraoka
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan
| | - Naoki Ito
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan
| | - Yuko Miyagoe-Suzuki
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan
| | - Shin'ichi Takeda
- Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi, Kodaira, Tokyo 187-8502, Japan.
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Bohovych I, Chan SS, Khalimonchuk O. Mitochondrial protein quality control: the mechanisms guarding mitochondrial health. Antioxid Redox Signal 2015; 22:977-94. [PMID: 25546710 PMCID: PMC4390190 DOI: 10.1089/ars.2014.6199] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 12/20/2014] [Indexed: 12/20/2022]
Abstract
SIGNIFICANCE Mitochondria are complex dynamic organelles pivotal for cellular physiology and human health. Failure to maintain mitochondrial health leads to numerous maladies that include late-onset neurodegenerative diseases and cardiovascular disorders. Furthermore, a decline in mitochondrial health is prevalent with aging. A set of evolutionary conserved mechanisms known as mitochondrial quality control (MQC) is involved in recognition and correction of the mitochondrial proteome. RECENT ADVANCES Here, we review current knowledge and latest developments in MQC. We particularly focus on the proteolytic aspect of MQC and its impact on health and aging. CRITICAL ISSUES While our knowledge about MQC is steadily growing, critical gaps remain in the mechanistic understanding of how MQC modules sense damage and preserve mitochondrial welfare, particularly in higher organisms. FUTURE DIRECTIONS Delineating how coordinated action of the MQC modules orchestrates physiological responses on both organellar and cellular levels will further elucidate the current picture of MQC's role and function in health, cellular stress, and degenerative diseases.
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Affiliation(s)
- Iryna Bohovych
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska
- Nebraska Redox Biology Center, University of Nebraska-Lincoln, Lincoln, Nebraska
| | - Sherine S.L. Chan
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina
| | - Oleh Khalimonchuk
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska
- Nebraska Redox Biology Center, University of Nebraska-Lincoln, Lincoln, Nebraska
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Lau E, Huang D, Cao Q, Dincer TU, Black CM, Lin AJ, Lee JM, Wang D, Liem DA, Lam MP, Ping P. Spatial and temporal dynamics of the cardiac mitochondrial proteome. Expert Rev Proteomics 2015; 12:133-46. [PMID: 25752359 PMCID: PMC4721584 DOI: 10.1586/14789450.2015.1024227] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mitochondrial proteins alter in their composition and quantity drastically through time and space in correspondence to changing energy demands and cellular signaling events. The integrity and permutations of this dynamism are increasingly recognized to impact the functions of the cardiac proteome in health and disease. This article provides an overview on recent advances in defining the spatial and temporal dynamics of mitochondrial proteins in the heart. Proteomics techniques to characterize dynamics on a proteome scale are reviewed and the physiological consequences of altered mitochondrial protein dynamics are discussed. Lastly, we offer our perspectives on the unmet challenges in translating mitochondrial dynamics markers into the clinic.
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Affiliation(s)
- Edward Lau
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Derrick Huang
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Quan Cao
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - T. Umut Dincer
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Caitie M. Black
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Amanda J. Lin
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Jessica M. Lee
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Ding Wang
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - David A. Liem
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Maggie P.Y. Lam
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - Peipei Ping
- Departments of Physiology, The NHLBI Proteomics Center at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
- Departments of Medicine, and Bioinformatics, NIH Center of Excellence in Big Data Computing at UCLA, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
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Mitochondrial Lon regulates apoptosis through the association with Hsp60-mtHsp70 complex. Cell Death Dis 2015; 6:e1642. [PMID: 25675302 PMCID: PMC4669791 DOI: 10.1038/cddis.2015.9] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 12/31/2014] [Accepted: 01/06/2015] [Indexed: 01/20/2023]
Abstract
Human Lon protease is a mitochondrial matrix protein with several functions, including protein degradation, mitochondrial DNA (mtDNA) binding, and chaperone activity. Lon is currently emerging as an important regulator of mitochondria-contributed tumorigenesis due to its overexpression in cancer cells. To understand the mechanism of increased Lon in tumor cells, we studied the interactome to identify the chaperone Lon-associated proteins by proteomics approaches using the cells overexpressing Lon. In the present study, we designed a method connecting co-immunoprecipitation (Co-IP) to in-solution digestion for the shotgun mass spectrometry. We identified 76 proteins that were putative Lon-associated proteins that participated in mitochondrial chaperone system, cellular metabolism and energy, cell death and survival, and mtDNA stability. The association between Lon and NDUFS8 or Hsp60-mtHsp70 complex was confirmed by Co-IP and immunofluorescence co-localization assay. We then found that the protein stability/level of Hsp60-mtHsp70 complex depends on the level of Lon under oxidative stress. Most importantly, the ability of increased Lon-inhibited apoptosis is dependent on Hsp60 that binds p53 to inhibit apoptosis. These results suggest that the mechanism underlying cell survival regulated by Lon is mediated by the maintenance of the protein stability of Hsp60-mtHsp70 complex. This new knowledge of chaperone Lon interactome will allow us to better understand the cellular mechanism of Lon in mitochondrial function and of its overexpression in enhancing cell survival and tumorigenesis.
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Tu IF, Liao JH, Yang FL, Lin NT, Chan HL, Wu SH. Lon protease affects the RdxA nitroreductase activity and metronidazole susceptibility in Helicobacter pylori. Helicobacter 2014; 19:356-66. [PMID: 24834789 DOI: 10.1111/hel.12140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND The lon gene of Helicobacter pylori strains is constitutively expressed during growth. However, virtually nothing is understood concerning the role of Lon in H. pylori. This study examined the function and physiological role of Lon in H. pylori (HpLon) using a trapping approach to identify putative Lon binding partners in the bacterium. MATERIALS AND METHODS Protease-deficient Lon was expressed and served as the bait in trapping approach to capture the interacting partners in H. pylori. The antibiotic susceptibility of wild-type and lon derivative mutants was determined by the E test trips and the disc diffusion assay. The effect of HpLon on RdxA activity was detected the change in NADPH oxidation and metronidazole reduction by spectrophotometer. RESULTS Lon in Helicobacter pylori (HpLon) interacting partners are mostly associated with metronidazole activation. lon mutant presents more susceptible to metronidazole than that of the wild type, and this phenotype is recovered by complementation of the wild-type Lon. We found that the ATPases associated with a variety of cellular activities (AAA(+) ) module of HpLon causes a decrease in both NADPH oxidase and Mtz reductase activity in RdxA, a major Mtz-activating enzyme in H. pylori. CONCLUSION Metronidazole resistance of H. pylori causes the serious medical problem worldwide. In this study, HpLon is involved in metronidazole susceptibility among H. pylori strains. We provide the evidence that HpLon alters RdxA activity in vitro. The decrease in metronidazole activation caused by HpLon is possibly prior to accumulate mutation in rdxA gene before the metronidazole-resistant strains to be occurred.
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Affiliation(s)
- I-Fan Tu
- Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 300, Taiwan
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Gibellini L, Pinti M, Boraldi F, Giorgio V, Bernardi P, Bartolomeo R, Nasi M, De Biasi S, Missiroli S, Carnevale G, Losi L, Tesei A, Pinton P, Quaglino D, Cossarizza A. Silencing of mitochondrial Lon protease deeply impairs mitochondrial proteome and function in colon cancer cells. FASEB J 2014; 28:5122-35. [DOI: 10.1096/fj.14-255869] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lara Gibellini
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Marcello Pinti
- Department of Life SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Federica Boraldi
- Department of Life SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | | | - Paolo Bernardi
- Department of Biomedical SciencesUniversity of PadovaPaduaItaly
| | - Regina Bartolomeo
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Milena Nasi
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Sara De Biasi
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Sonia Missiroli
- Department of Morphology, Surgery, and Experimental MedicineUniversity of FerraraFerraraItaly
| | - Gianluca Carnevale
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Lorena Losi
- Department of Life SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Anna Tesei
- Biosciences LaboratoryIRCCS Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST)MeldolaItaly
| | - Paolo Pinton
- Department of Morphology, Surgery, and Experimental MedicineUniversity of FerraraFerraraItaly
| | - Daniela Quaglino
- Department of Life SciencesUniversity of Modena and Reggio EmiliaModenaItaly
| | - Andrea Cossarizza
- Department of Surgery, Medicine, Dentistry, and Morphological SciencesUniversity of Modena and Reggio EmiliaModenaItaly
- Dipartimento Sperimentale Interaziendale, Campus San LazzaroUniversity of Modena and Reggio EmiliaReggio EmiliaItaly
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HtrA2/Omi influences the stability of LON protease 1 and prohibitin, proteins involved in mitochondrial homeostasis. Exp Cell Res 2014; 328:456-65. [PMID: 25094062 DOI: 10.1016/j.yexcr.2014.07.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 06/30/2014] [Accepted: 07/25/2014] [Indexed: 10/24/2022]
Abstract
High temperature requirement A2 (HtrA2)/Omi is a serine protease localized in mitochondria. In response to apoptotic stimuli, HtrA2 is released to the cytoplasm and cleaves many proteins, including XIAP, Apollon/BRUCE, WT1, and Ped/Pea-15, to promote apoptosis. However, the function of HtrA2 in mitochondria under normal conditions remains unclear. Here, we show that the mitochondrial proteins, LON protease 1 (LONP1) and prohibitin (PHB), are overexpressed in HtrA2(-/-) mouse embryonic fibroblast (MEF) cells and HtrA2 knock-down HEK293T cells. We also confirm the effect of the HtrA2 protease on the stability of the above mitochondrial quality control proteins in motor neuron degeneration 2 (mnd2) mice, which have a greatly reduced protease activity as a result of a Ser276Cys missense mutation of the HtrA2 gene. In addition, PHB interacts with and is directly cleaved by HtrA2. Luminescence assays demonstrate that the intracellular ATP level is decreased in HtrA2(-/-) cells compared to HtrA2(+/+) cells. HtrA2 deficiency causes a decrease in the mitochondrial membrane potential, and reactive oxygen species (ROS) generation is greater in HtrA2(-/-) cells than in HtrA2(+/+) cells. Our results implicate that HtrA2 might be an upstream regulator of mitochondrial homeostasis.
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Smakowska E, Czarna M, Janska H. Mitochondrial ATP-dependent proteases in protection against accumulation of carbonylated proteins. Mitochondrion 2014; 19 Pt B:245-51. [PMID: 24662487 DOI: 10.1016/j.mito.2014.03.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/11/2014] [Accepted: 03/14/2014] [Indexed: 10/25/2022]
Abstract
Carbonylation is an irreversible oxidative modification of proteins induced by reactive oxygen species (ROS) and reactive nitrogen species (RNS) or by-products of oxidative stress. Carbonylation leads to the loss of protein function and is used as a marker of oxidative stress. Recent data indicate that carbonylation is not only an unfavorable chance process but may also play a significant role in the control of diverse physiological processes. In plants, carbonylated proteins have been found in all cellular compartments; however, mitochondria, one of the major sources of reactive species, show the highest levels of oxidatively modified proteins under normal or stress conditions. Carbonylated proteins tend to misfold and have to be removed to prevent the formation of harmful insoluble aggregates. Mitochondria have developed several pathways that continuously monitor and remove oxidatively damaged polypeptides, and the mitochondrial protein quality control (mtPQC) system, comprising chaperones and ATP-dependent proteases, is the first line of defense. The Lon protease has been recognized as a key protease involved in the removal of oxidized proteins in yeast and mammalian mitochondria, but not in plants. Recently, it has been reported that the inner-membrane human i-AAA and m-AAA and Arabidopsis i-AAA proteases are crucial components of the defense against accumulation of carbonylated proteins, but the molecular basis of their action is not yet clear. Altogether, the mitochondrial AAA proteases secure the mitochondrial proteome against accumulation of carbonylated proteins.
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Affiliation(s)
- Elwira Smakowska
- Faculty of Biotechnology, University of Wroclaw, F. Joliot-Curie 14A, 50-383 Wroclaw, Poland
| | - Malgorzata Czarna
- Faculty of Biotechnology, University of Wroclaw, F. Joliot-Curie 14A, 50-383 Wroclaw, Poland
| | - Hanna Janska
- Faculty of Biotechnology, University of Wroclaw, F. Joliot-Curie 14A, 50-383 Wroclaw, Poland.
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