1
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Taskin AA, Poveda-Huertes D, Vögtle FN. Author's View: a nuclear transcription factor relocalizing to mitochondria rescues cells from proteotoxic aggregates. Mol Cell Oncol 2020; 7:1698256. [PMID: 31993502 PMCID: PMC6961659 DOI: 10.1080/23723556.2019.1698256] [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: 11/20/2019] [Revised: 11/22/2019] [Accepted: 11/25/2019] [Indexed: 12/01/2022]
Abstract
Mitochondrial proteostasis is essential for survival, and imbalances can result in severe human diseases. We identified a novel stress response triggered upon accumulation of proteotoxic aggregates in the mitochondrial matrix. Mitochondria-to-nucleus signaling results in a transcriptional response and translocation of a nuclear transcription factor into mitochondria to maintain mitochondrial gene expression.
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Affiliation(s)
- Asli Aras Taskin
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Daniel Poveda-Huertes
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - F-Nora Vögtle
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany
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2
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Poveda-Huertes D, Matic S, Marada A, Habernig L, Licheva M, Myketin L, Gilsbach R, Tosal-Castano S, Papinski D, Mulica P, Kretz O, Kücükköse C, Taskin AA, Hein L, Kraft C, Büttner S, Meisinger C, Vögtle FN. An Early mtUPR: Redistribution of the Nuclear Transcription Factor Rox1 to Mitochondria Protects against Intramitochondrial Proteotoxic Aggregates. Mol Cell 2020; 77:180-188.e9. [PMID: 31630969 PMCID: PMC6941230 DOI: 10.1016/j.molcel.2019.09.026] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 08/20/2019] [Accepted: 09/23/2019] [Indexed: 11/29/2022]
Abstract
The mitochondrial proteome is built mainly by import of nuclear-encoded precursors, which are targeted mostly by cleavable presequences. Presequence processing upon import is essential for proteostasis and survival, but the consequences of dysfunctional protein maturation are unknown. We find that impaired presequence processing causes accumulation of precursors inside mitochondria that form aggregates, which escape degradation and unexpectedly do not cause cell death. Instead, cells survive via activation of a mitochondrial unfolded protein response (mtUPR)-like pathway that is triggered very early after precursor accumulation. In contrast to classical stress pathways, this immediate response maintains mitochondrial protein import, membrane potential, and translation through translocation of the nuclear HMG-box transcription factor Rox1 to mitochondria. Rox1 binds mtDNA and performs a TFAM-like function pivotal for transcription and translation. Induction of early mtUPR provides a reversible stress model to mechanistically dissect the initial steps in mtUPR pathways with the stressTFAM Rox1 as the first line of defense.
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Affiliation(s)
- Daniel Poveda-Huertes
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Stanka Matic
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Adinarayana Marada
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Lukas Habernig
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 10691 Stockholm, Sweden
| | - Mariya Licheva
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Lisa Myketin
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Ralf Gilsbach
- Institute of Experimental and Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Sergi Tosal-Castano
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 10691 Stockholm, Sweden
| | - Daniel Papinski
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, 1030 Vienna, Austria
| | - Patrycja Mulica
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Oliver Kretz
- III. Department of Medicine, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany; Department of Medicine IV, Medical Center and Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Cansu Kücükköse
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Asli Aras Taskin
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Lutz Hein
- Institute of Experimental and Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - Claudine Kraft
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - Sabrina Büttner
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 10691 Stockholm, Sweden; Institute for Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - Chris Meisinger
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany; CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
| | - F-Nora Vögtle
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
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3
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Zheng JF, He S, Zeng Z, Gu X, Cai L, Qi G. PMPCB Silencing Sensitizes HCC Tumor Cells to Sorafenib Therapy. Mol Ther 2019; 27:1784-1795. [PMID: 31337603 PMCID: PMC6822227 DOI: 10.1016/j.ymthe.2019.06.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 06/10/2019] [Accepted: 06/19/2019] [Indexed: 12/24/2022] Open
Abstract
Hepatocellular carcinoma (HCC) tumors invariably develop resistance to cytotoxic and targeted agents, resulting in failed treatment and tumor recurrence. Previous in vivo short hairpin RNA (shRNA) screening evidence revealed mitochondrial-processing peptidase (PMPC) as a leading gene contributing to tumor cell resistance against sorafenib, a multikinase inhibitor used to treat advanced HCC. Here, we investigated the contributory role of the β subunit of PMPC (PMPCB) in sorafenib resistance. Silencing PMPCB increased HCC tumor cell susceptibility to sorafenib therapy, decreased liver tumor burden, and improved survival of tumor-bearing mice receiving sorafenib. Moreover, sorafenib + PMPCB shRNA combination therapy led to attenuated liver tumor burden and improved survival outcome for tumor-bearing mice, and it reduced colony formation in murine and human HCC cell lines in vitro. Additionally, PMPCB silencing enhanced PINK1-Parkin signaling and downregulated the anti-apoptotic protein MCL-1 in sorafenib-treated HCC cells, which is indicative of a healthier pro-apoptotic phenotype. Higher pre-treatment MCL-1 expression was associated with inferior survival outcomes in sorafenib-treated HCC patients. Elevated MCL-1 expression was present in sorafenib-resistant murine HCC cells, while MCL-1 knockdown sensitized these cells to sorafenib. In conclusion, our findings advocate combination regimens employing sorafenib with PMPCB knockdown or MCL-1 knockdown to circumvent sorafenib resistance in HCC patients.
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Affiliation(s)
- Jian-Feng Zheng
- Department of Laboratory Medicine, Baoan Central Hospital of Shenzhen, The Fifth Affiliated Hospital of Shenzhen University, Shenzhen 518102, Guangdong, P.R. China.
| | - Shaozhong He
- Department of Oncology, Baoan Central Hospital of Shenzhen, The Fifth Affiliated Hospital of Shenzhen University, Shenzhen 518102, Guangdong, P.R. China
| | - Zongyue Zeng
- Molecular Oncology Laboratory, Department of Orthopedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Xinqi Gu
- Department of Gastroenterology, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, Shanghai 201399, P.R. China
| | - Lei Cai
- Department of Hepatobiliary Surgery, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, Shanghai 201399, P.R. China
| | - Guangying Qi
- Department of Pathology and Physiopathology, Guilin Medical University, Guilin 541004, Guangxi, P.R. China.
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4
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Niemi NM, Wilson GM, Overmyer KA, Vögtle FN, Myketin L, Lohman DC, Schueler KL, Attie AD, Meisinger C, Coon JJ, Pagliarini DJ. Pptc7 is an essential phosphatase for promoting mammalian mitochondrial metabolism and biogenesis. Nat Commun 2019; 10:3197. [PMID: 31324765 PMCID: PMC6642090 DOI: 10.1038/s41467-019-11047-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 06/14/2019] [Indexed: 11/24/2022] Open
Abstract
Mitochondrial proteins are replete with phosphorylation, yet its functional relevance remains largely unclear. The presence of multiple resident mitochondrial phosphatases, however, suggests that protein dephosphorylation may be broadly important for calibrating mitochondrial activities. To explore this, we deleted the poorly characterized matrix phosphatase Pptc7 from mice using CRISPR-Cas9 technology. Strikingly, Pptc7-/- mice exhibit hypoketotic hypoglycemia, elevated acylcarnitines and serum lactate, and die soon after birth. Pptc7-/- tissues have markedly diminished mitochondrial size and protein content despite normal transcript levels, and aberrantly elevated phosphorylation on select mitochondrial proteins. Among these, we identify the protein translocase complex subunit Timm50 as a putative Pptc7 substrate whose phosphorylation reduces import activity. We further find that phosphorylation within or near the mitochondrial targeting sequences of multiple proteins could disrupt their import rates and matrix processing. Overall, our data define Pptc7 as a protein phosphatase essential for proper mitochondrial function and biogenesis during the extrauterine transition.
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Affiliation(s)
- Natalie M Niemi
- Morgridge Institute for Research, Madison, WI, 53715, USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Gary M Wilson
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Katherine A Overmyer
- Morgridge Institute for Research, Madison, WI, 53715, USA
- Genome Center of Wisconsin, Madison, WI, 53706, USA
| | - F-Nora Vögtle
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, 79104, Germany
| | - Lisa Myketin
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, 79104, Germany
| | | | - Kathryn L Schueler
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Alan D Attie
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Chris Meisinger
- Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg im Breisgau, 79104, Germany
| | - Joshua J Coon
- Morgridge Institute for Research, Madison, WI, 53715, USA
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
- Genome Center of Wisconsin, Madison, WI, 53706, USA
- Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - David J Pagliarini
- Morgridge Institute for Research, Madison, WI, 53715, USA.
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, 53706, USA.
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5
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Jensen LT, Phyu T, Jain A, Kaewwanna C, Jensen AN. Decreased accumulation of superoxide dismutase 2 within mitochondria in the yeast model of Shwachman-Diamond syndrome. J Cell Biochem 2019; 120:13867-13880. [PMID: 30938873 DOI: 10.1002/jcb.28660] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 12/20/2018] [Accepted: 01/07/2019] [Indexed: 12/16/2022]
Abstract
Mutations in the human SBDS gene is the most common cause of Shwachman-Diamond syndrome (SDS). The SBDS protein participates in ribosome biogenesis; however, effects beyond reduced translation efficiency are thought to be involved in SDS progression. Impaired mitochondrial function has been reported for cells lacking either SBDS or Sdo1p, the Saccharomyces cerevisiae SBDS ortholog. To better understand how the loss of SBDS/Sdo1p leads to mitochondria damage, we utilized the S. cerevisiae model of SDS. Yeast deleted for SDO1 show increased oxidative damage to mitochondrial proteins and a marked decrease in protein levels and activity of mitochondrial superoxide dismutase 2 (Sod2p), a key enzyme involved in defense against oxidants. Immature forms of Sod2p are observed in sdo1∆ cells suggesting a defect in proteolysis of the presequence. Yeast deleted for CYM1, encoding a presequence protease, display a similar reduction in Sod2p activity as sdo1∆ cells, as well as elevated oxidative damage, to mitochondrial proteins. Sod2p protein levels and activity are largely restored in a por1∆ sdo1∆ strain, lacking the major mitochondrial voltage-dependent anion channel. Together these results indicate that mitochondrial insufficiency in sdo1∆ cells may be linked to the accumulation of immature presequence containing proteins and this effect is a consequence, at least in part, from loss of counter-regulation of Por1p by Sdo1p.
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Affiliation(s)
- Laran T Jensen
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - The Phyu
- Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Ayushi Jain
- Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Chonlada Kaewwanna
- Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand
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6
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Mitochondrial diseases caused by dysfunctional mitochondrial protein import. Biochem Soc Trans 2018; 46:1225-1238. [PMID: 30287509 DOI: 10.1042/bst20180239] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/20/2018] [Accepted: 08/31/2018] [Indexed: 12/18/2022]
Abstract
Mitochondria are essential organelles which perform complex and varied functions within eukaryotic cells. Maintenance of mitochondrial health and functionality is thus a key cellular priority and relies on the organelle's extensive proteome. The mitochondrial proteome is largely encoded by nuclear genes, and mitochondrial proteins must be sorted to the correct mitochondrial sub-compartment post-translationally. This essential process is carried out by multimeric and dynamic translocation and sorting machineries, which can be found in all four mitochondrial compartments. Interestingly, advances in the diagnosis of genetic disease have revealed that mutations in various components of the human import machinery can cause mitochondrial disease, a heterogenous and often severe collection of disorders associated with energy generation defects and a multisystem presentation often affecting the cardiovascular and nervous systems. Here, we review our current understanding of mitochondrial protein import systems in human cells and the molecular basis of mitochondrial diseases caused by defects in these pathways.
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7
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Taskin AA, Kücükköse C, Burger N, Mossmann D, Meisinger C, Vögtle FN. The novel mitochondrial matrix protease Ste23 is required for efficient presequence degradation and processing. Mol Biol Cell 2017; 28:997-1002. [PMID: 28228553 PMCID: PMC5391191 DOI: 10.1091/mbc.e16-10-0732] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 02/08/2017] [Accepted: 02/13/2017] [Indexed: 11/15/2022] Open
Abstract
Approximately 70% of mitochondrial precursor proteins are imported from the cytosol via N-terminal presequences, which are cleaved upon exposure to the mitochondrial processing protease MPP in the matrix. Cleaved presequence peptides then need to be efficiently degraded, and impairment of this clearance step, for example, by amyloid β peptides, causes feedback inhibition of MPP, leading ultimately to accumulation of immature precursor proteins within mitochondria. Degradation of mitochondrial peptides is performed by Cym1 in yeast and its homologue, PreP, in humans. Here we identify the novel mitochondrial matrix protease Ste23 in yeast, a homologue of human insulin-degrading enzyme, which is required for efficient peptide degradation. Ste23 and Cym1 tightly cooperate to ensure the correct functioning of the essential presequence processing machinery.
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Affiliation(s)
- Asli Aras Taskin
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Cansu Kücükköse
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Nils Burger
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Dirk Mossmann
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Chris Meisinger
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - F-Nora Vögtle
- Institute of Biochemistry and Molecular Biology, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
- Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
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8
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Dasari S, Kölling R. Role of mitochondrial processing peptidase and AAA proteases in processing of the yeast acetohydroxyacid synthase precursor. FEBS Open Bio 2016; 6:765-73. [PMID: 27398316 PMCID: PMC4932456 DOI: 10.1002/2211-5463.12088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 05/17/2016] [Accepted: 05/18/2016] [Indexed: 11/16/2022] Open
Abstract
We studied presequence processing of the mitochondrial‐matrix targeted acetohydroxyacid synthase (Ilv2). C‐terminal 3HA‐tagging altered the cleavage pattern from a single step to sequential two‐step cleavage, giving rise to two Ilv2‐3HA forms (A and B). Both cleavage events were dependent on the mitochondrial processing peptidase (MPP). We present evidence for the involvement of three AAA ATPases, m‐ and i‐AAA proteases, and Mcx1, in Ilv2‐3HA processing. Both, precursor to A‐form and A‐form to B‐form cleavage were strongly affected in a ∆yme1 mutant. These defects could be suppressed by overexpression of MPP, suggesting that MPP activity is limiting in the ∆yme1 mutant. Our data suggest that for some substrates AAA ATPases could play an active role in the translocation of matrix‐targeted proteins.
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Affiliation(s)
- Suvarna Dasari
- Institut für Lebensmittelwissenschaft und Biotechnologie Fg. Hefegenetik und Gärungstechnologie (150f) Universität Hohenheim Stuttgart Germany
| | - Ralf Kölling
- Institut für Lebensmittelwissenschaft und Biotechnologie Fg. Hefegenetik und Gärungstechnologie (150f) Universität Hohenheim Stuttgart Germany
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9
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Joshi M, Anselm I, Shi J, Bale TA, Towne M, Schmitz-Abe K, Crowley L, Giani FC, Kazerounian S, Markianos K, Lidov HG, Folkerth R, Sankaran VG, Agrawal PB. Mutations in the substrate binding glycine-rich loop of the mitochondrial processing peptidase-α protein (PMPCA) cause a severe mitochondrial disease. Cold Spring Harb Mol Case Stud 2016; 2:a000786. [PMID: 27148589 PMCID: PMC4853520 DOI: 10.1101/mcs.a000786] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
We describe a large Lebanese family with two affected members, a young female proband and her male cousin, who had multisystem involvement including profound global developmental delay, severe hypotonia and weakness, respiratory insufficiency, blindness, and lactic acidemia—findings consistent with an underlying mitochondrial disorder. Whole-exome sequencing was performed on DNA from the proband and both parents. The proband and her cousin carried compound heterozygous mutations in the PMPCA gene that encodes for α-mitochondrial processing peptidase (α-MPP), a protein likely involved in the processing of mitochondrial proteins. The variants were located close to and postulated to affect the substrate binding glycine-rich loop of the α-MPP protein. Functional assays including immunofluorescence and western blot analysis on patient's fibroblasts revealed that these variants reduced α-MPP levels and impaired frataxin production and processing. We further determined that those defects could be rescued through the expression of exogenous wild-type PMPCA cDNA. Our findings link defective α-MPP protein to a severe mitochondrial disease.
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Affiliation(s)
- Mugdha Joshi
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Division of Newborn Medicine, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Gene Discovery Core, Manton Center for Orphan Disease Research, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Irina Anselm
- Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Jiahai Shi
- Whitehead Institute for Biomedical Research, MIT, Cambridge, Massachusetts 02142, USA;; Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Tejus A Bale
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Meghan Towne
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Gene Discovery Core, Manton Center for Orphan Disease Research, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Klaus Schmitz-Abe
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Laura Crowley
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Gene Discovery Core, Manton Center for Orphan Disease Research, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Felix C Giani
- Division of Hematology/Oncology, Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, Massachusetts 02115, USA;; Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Shideh Kazerounian
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Kyriacos Markianos
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Hart G Lidov
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Rebecca Folkerth
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Vijay G Sankaran
- Division of Hematology/Oncology, Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, Massachusetts 02115, USA;; Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Pankaj B Agrawal
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Division of Newborn Medicine, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA;; Gene Discovery Core, Manton Center for Orphan Disease Research, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
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10
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Burkhart JM, Taskin AA, Zahedi RP, Vögtle FN. Quantitative Profiling for Substrates of the Mitochondrial Presequence Processing Protease Reveals a Set of Nonsubstrate Proteins Increased upon Proteotoxic Stress. J Proteome Res 2015; 14:4550-63. [PMID: 26446170 DOI: 10.1021/acs.jproteome.5b00327] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The majority of mitochondrial preproteins are targeted via N-terminal presequences that are cleaved upon import into the organelle. The essential mitochondrial processing protease (MPP) is assumed to cleave the majority of incoming precursors; however, only a small fraction of mitochondrial precursors have been experimentally analyzed limiting the information on MPP recognition and substrate specificity. Here we present the first systematic approach for identification of authentic MPP substrate proteins using a temperature-sensitive mutant of the MPP subunit Mas1. Inactivation of MPP at nonpermissive temperature leads to accumulation of immature precursors in mitochondria, which were measured by quantitative N-terminal ChaFRADIC. This led to the identification of 66 novel MPP substrates. Deduction of the cleaved presequences determines arginine in position -2 of the cleavage site as a main factor for MPP recognition. Interestingly, a set of nonprocessed proteins was also increased in mas1 mutant mitochondria. Additionally, mas1 mitochondria respond to temperature elevation with an increase in membrane potential and oxygen consumption. These changes might indicate that mas1 cells exert a response to balance the proteotoxic stress induced by MPP dysfunction.
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Affiliation(s)
- Julia M Burkhart
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. , Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Asli A Taskin
- Institut für Biochemie und Molekularbiologie, ZBMZ, Universität Freiburg , Stefan-Meier-Str. 17, 79104 Freiburg, Germany
- Faculty of Biology, Universität Freiburg , Schänzlestrasse 1, 79104 Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, University of Freiburg , Albertstrasse 19A, 79104 Freiburg, Germany
| | - René P Zahedi
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. , Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - F-Nora Vögtle
- Institut für Biochemie und Molekularbiologie, ZBMZ, Universität Freiburg , Stefan-Meier-Str. 17, 79104 Freiburg, Germany
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11
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Mossmann D, Vögtle FN, Taskin AA, Teixeira PF, Ring J, Burkhart JM, Burger N, Pinho CM, Tadic J, Loreth D, Graff C, Metzger F, Sickmann A, Kretz O, Wiedemann N, Zahedi RP, Madeo F, Glaser E, Meisinger C. Amyloid-β peptide induces mitochondrial dysfunction by inhibition of preprotein maturation. Cell Metab 2014; 20:662-9. [PMID: 25176146 DOI: 10.1016/j.cmet.2014.07.024] [Citation(s) in RCA: 149] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 06/14/2014] [Accepted: 07/24/2014] [Indexed: 01/10/2023]
Abstract
Most mitochondrial proteins possess N-terminal presequences that are required for targeting and import into the organelle. Upon import, presequences are cleaved off by matrix processing peptidases and subsequently degraded by the peptidasome Cym1/PreP, which also degrades Amyloid-beta peptides (Aβ). Here we find that impaired turnover of presequence peptides results in feedback inhibition of presequence processing enzymes. Moreover, Aβ inhibits degradation of presequence peptides by PreP, resulting in accumulation of mitochondrial preproteins and processing intermediates. Dysfunctional preprotein maturation leads to rapid protein degradation and an imbalanced organellar proteome. Our findings reveal a general mechanism by which Aβ peptide can induce the multiple diverse mitochondrial dysfunctions accompanying Alzheimer's disease.
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Affiliation(s)
- Dirk Mossmann
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany; Trinationales Graduiertenkolleg 1478, University of Freiburg, 79104 Freiburg, Germany; Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - F-Nora Vögtle
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
| | - Asli Aras Taskin
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany; Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Pedro Filipe Teixeira
- Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden
| | - Julia Ring
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - Julia M Burkhart
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany
| | - Nils Burger
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany
| | - Catarina Moreira Pinho
- Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden
| | - Jelena Tadic
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - Desiree Loreth
- Department of Neuroanatomy, University of Freiburg, 79104 Freiburg, Germany; Neurocenter, Department of Neurology, University of Freiburg, 79104 Freiburg, Germany
| | - Caroline Graff
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet-Alzheimer's Disease Research Center, Karolinska Institutet, 14186 Stockholm, Sweden
| | - Friedrich Metzger
- F. Hoffmann-La Roche Ltd., pRED Pharma Research & Early Development, DTA Neuroscience, 4070 Basel, Switzerland
| | - Albert Sickmann
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany; Medinzinisches Proteom Center, 44801 Bochum, Germany
| | - Oliver Kretz
- Department of Neuroanatomy, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - Nils Wiedemann
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - René P Zahedi
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany
| | - Frank Madeo
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - Elzbieta Glaser
- Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden
| | - Chris Meisinger
- Institut für Biochemie und Molekularbiologie, ZBMZ, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
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12
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Mukhopadhyay A, Wei B, Weiner H. Mitochondrial NAD dependent aldehyde dehydrogenase either from yeast or human replaces yeast cytoplasmic NADP dependent aldehyde dehydrogenase for the aerobic growth of yeast on ethanol. Biochim Biophys Acta Gen Subj 2013; 1830:3391-8. [PMID: 23454351 DOI: 10.1016/j.bbagen.2013.02.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 02/08/2013] [Accepted: 02/12/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND In a previous study, we deleted three aldehyde dehydrogenase (ALDH) genes, involved in ethanol metabolism, from yeast Saccharomyces cerevisiae and found that the triple deleted yeast strain did not grow on ethanol as sole carbon source. The ALDHs were NADP dependent cytosolic ALDH1, NAD dependent mitochondrial ALDH2 and NAD/NADP dependent mitochondrial ALDH5. Double deleted strain ΔALDH2+ΔALDH5 or ΔALDH1+ΔALDH5 could grow on ethanol. However, the double deleted strain ΔALDH1+ΔALDH2 did not grow in ethanol. METHODS Triple deleted yeast strain was used. Mitochondrial NAD dependent ALDH from yeast or human was placed in yeast cytosol. RESULTS In the present study we found that a mutant form of cytoplasmic ALDH1 with very low activity barely supported the growth of the triple deleted strain (ΔALDH1+ΔALDH2+ΔALDH5) on ethanol. Finding the importance of NADP dependent ALDH1 on the growth of the strain on ethanol we examined if NAD dependent mitochondrial ALDH2 either from yeast or human would be able to support the growth of the triple deleted strain on ethanol if the mitochondrial form was placed in cytosol. We found that the NAD dependent mitochondrial ALDH2 from yeast or human was active in cytosol and supported the growth of the triple deleted strain on ethanol. CONCLUSION This study showed that coenzyme preference of ALDH is not critical in cytosol of yeast for the growth on ethanol. GENERAL SIGNIFICANCE The present study provides a basis to understand the coenzyme preference of ALDH in ethanol metabolism in yeast.
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Huang X, Huang HQ. Alteration of the kidney membrane proteome of Mizuhopecten yessoensis induced by low-level methyl parathion exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 114-115:189-199. [PMID: 22446831 DOI: 10.1016/j.aquatox.2012.01.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Revised: 01/25/2012] [Accepted: 01/31/2012] [Indexed: 05/31/2023]
Abstract
Methyl parathion (MP) is a widely used organophosphorus pesticide that causes severe health and environmental effects. We investigated the alteration of the proteomic profile in the membrane enriched fraction of the kidneys of the scallop Mizuhopecten yessoensis exposed to low-level MP. Gas chromatography analysis showed that MP residues were significantly accumulated in the kidneys and the digestive glands of the scallops. According to two-dimensional electrophoresis, 17 proteins were differentially modulated under MP exposure. The mRNA expressions of 12 differential proteins were analyzed using quantitative PCR, and 10 showed consistent alteration of mRNA level with that of protein expression level. Altered expressions of two proteins (mitochondrial processing peptidase and α-tubulin) were also examined using Western blotting, showing that the mitochondrial processing peptidase was down-regulated but α-tubulin remained unchanged in response to MP exposure. Subcellular locations of all the identified proteins that were predicted using bioinformatics tools indicate that few of them are permanently located in the membrane. The differentially expressed proteins are involved in several critical biological processes, and their relevance to human health has been illuminated. These data taken together have provided some novel insights into the chronic toxicity mechanism of MP and have suggested mitochondrial processing peptidase as a potential biomarker for human health and environmental monitoring.
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Affiliation(s)
- Xiang Huang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361005, China
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Amata O, Marino T, Russo N, Toscano M. A Proposal for Mitochondrial Processing Peptidase Catalytic Mechanism. J Am Chem Soc 2011; 133:17824-31. [DOI: 10.1021/ja207065v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Orazio Amata
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro d'Eccellenza MURST, Universita' della Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Tiziana Marino
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro d'Eccellenza MURST, Universita' della Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Nino Russo
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro d'Eccellenza MURST, Universita' della Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Marirosa Toscano
- Dipartimento di Chimica and Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite-Centro d'Eccellenza MURST, Universita' della Calabria, I-87030 Arcavacata di Rende (CS), Italy
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15
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Midzak A, Rone M, Aghazadeh Y, Culty M, Papadopoulos V. Mitochondrial protein import and the genesis of steroidogenic mitochondria. Mol Cell Endocrinol 2011; 336:70-9. [PMID: 21147195 PMCID: PMC3057322 DOI: 10.1016/j.mce.2010.12.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2010] [Revised: 12/03/2010] [Accepted: 12/05/2010] [Indexed: 11/23/2022]
Abstract
The principal site of regulation of steroid hormone biosynthesis is the transfer of cholesterol from the outer to inner mitochondrial membrane. Hormonal stimulation of steroidogenic cells promotes this mitochondrial lipid import through a multi-protein complex, termed the transduceosome, spanning the two membranes. The transduceosome complex is assembled from multiple proteins, such as the steroidogenic acute regulatory (STAR) protein and translocator protein (TSPO), and requires their targeting to the mitochondria for transduceosome function. The vast majority of mitochondrial proteins, including those participating in cholesterol import, are encoded in the nucleus. Their subsequent mitochondrial incorporation is performed through a series of protein import machineries located in the outer and inner mitochondrial membranes. Here we review our current knowledge of the mitochondrial cholesterol import machinery of the transduceosome. This is complemented with descriptions of mitochondrial protein import machineries and mechanisms by which these machineries assemble the transduceosome in steroidogenic mitochondria.
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Affiliation(s)
- Andrew Midzak
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Medicine, McGill University, Montreal, Quebec, H3G 1A4, Canada
| | - Malena Rone
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Medicine, McGill University, Montreal, Quebec, H3G 1A4, Canada
| | - Yassaman Aghazadeh
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Medicine, McGill University, Montreal, Quebec, H3G 1A4, Canada
| | - Martine Culty
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Medicine, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, H3G 1A4, Canada
| | - Vassilios Papadopoulos
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Medicine, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Department of Biochemistry, McGill University, Montreal, Quebec, H3G 1A4, Canada
- Correspondence at The Research Institute of the McGill University Health Center, Montreal General Hospital, 1650 Cedar Avenue, C10-148, Montreal, Quebec H3G 1A4, Canada. Tel: 514-934-1934 ext. 44580; Fax: 514-934-8261;
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16
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A human pathology-related mutation prevents import of an aminoacyl-tRNA synthetase into mitochondria. Biochem J 2011; 433:441-6. [DOI: 10.1042/bj20101902] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mutations in the nuclear gene coding for the mitochondrial aspartyl-tRNA synthetase, a key enzyme for mitochondrial translation, are correlated with leukoencephalopathy. A Ser45 to Gly45 mutation is located in the predicted targeting signal of the protein. We demonstrate in the present study, by in vivo and in vitro approaches, that this pathology-related mutation impairs the import process across mitochondrial membranes.
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17
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Šmíd O, Matušková A, Harris SR, Kučera T, Novotný M, Horváthová L, Hrdý I, Kutějová E, Hirt RP, Embley TM, Janata J, Tachezy J. Reductive evolution of the mitochondrial processing peptidases of the unicellular parasites trichomonas vaginalis and giardia intestinalis. PLoS Pathog 2008; 4:e1000243. [PMID: 19096520 PMCID: PMC2597178 DOI: 10.1371/journal.ppat.1000243] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2008] [Accepted: 11/18/2008] [Indexed: 11/18/2022] Open
Abstract
Mitochondrial processing peptidases are heterodimeric enzymes (alpha/betaMPP) that play an essential role in mitochondrial biogenesis by recognizing and cleaving the targeting presequences of nuclear-encoded mitochondrial proteins. The two subunits are paralogues that probably evolved by duplication of a gene for a monomeric metallopeptidase from the endosymbiotic ancestor of mitochondria. Here, we characterize the MPP-like proteins from two important human parasites that contain highly reduced versions of mitochondria, the mitosomes of Giardia intestinalis and the hydrogenosomes of Trichomonas vaginalis. Our biochemical characterization of recombinant proteins showed that, contrary to a recent report, the Trichomonas processing peptidase functions efficiently as an alpha/beta heterodimer. By contrast, and so far uniquely among eukaryotes, the Giardia processing peptidase functions as a monomer comprising a single betaMPP-like catalytic subunit. The structure and surface charge distribution of the Giardia processing peptidase predicted from a 3-D protein model appear to have co-evolved with the properties of Giardia mitosomal targeting sequences, which, unlike classic mitochondrial targeting signals, are typically short and impoverished in positively charged residues. The majority of hydrogenosomal presequences resemble those of mitosomes, but longer, positively charged mitochondrial-type presequences were also identified, consistent with the retention of the Trichomonas alphaMPP-like subunit. Our computational and experimental/functional analyses reveal that the divergent processing peptidases of Giardia mitosomes and Trichomonas hydrogenosomes evolved from the same ancestral heterodimeric alpha/betaMPP metallopeptidase as did the classic mitochondrial enzyme. The unique monomeric structure of the Giardia enzyme, and the co-evolving properties of the Giardia enzyme and substrate, provide a compelling example of the power of reductive evolution to shape parasite biology.
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Affiliation(s)
- Ondřej Šmíd
- Department of Parasitology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Anna Matušková
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Simon R. Harris
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Tomáš Kučera
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Marián Novotný
- Department of Parasitology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Lenka Horváthová
- Department of Parasitology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Ivan Hrdý
- Department of Parasitology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Eva Kutějová
- Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Robert P. Hirt
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - T. Martin Embley
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Jiří Janata
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Jan Tachezy
- Department of Parasitology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
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Millar AH, Small ID, Day DA, Whelan J. Mitochondrial biogenesis and function in Arabidopsis. THE ARABIDOPSIS BOOK 2008; 6:e0111. [PMID: 22303236 PMCID: PMC3243404 DOI: 10.1199/tab.0111] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Mitochondria represent the powerhouse of cells through their synthesis of ATP. However, understanding the role of mitochondria in the growth and development of plants will rely on a much deeper appreciation of the complexity of this organelle. Arabidopsis research has provided clear identification of mitochondrial components, allowed wide-scale analysis of gene expression, and has aided reverse genetic manipulation to test the impact of mitochondrial component loss on plant function. Forward genetics in Arabidopsis has identified mitochondrial involvement in mutations with notable impacts on plant metabolism, growth and development. Here we consider the evidence for components involved in mitochondria biogenesis, metabolism and signalling to the nucleus.
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Affiliation(s)
- A. Harvey Millar
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009
| | - Ian D. Small
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009
| | - David A. Day
- School of Biological Sciences, The University of Sydney 2006, NSW, Australia
| | - James Whelan
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009
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