1
|
Kohler A, Carlström A, Nolte H, Kohler V, Jung SJ, Sridhara S, Tatsuta T, Berndtsson J, Langer T, Ott M. Early fate decision for mitochondrially encoded proteins by a molecular triage. Mol Cell 2023; 83:3470-3484.e8. [PMID: 37751741 DOI: 10.1016/j.molcel.2023.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 07/12/2023] [Accepted: 09/05/2023] [Indexed: 09/28/2023]
Abstract
Folding of newly synthesized proteins poses challenges for a functional proteome. Dedicated protein quality control (PQC) systems either promote the folding of nascent polypeptides at ribosomes or, if this fails, ensure their degradation. Although well studied for cytosolic protein biogenesis, it is not understood how these processes work for mitochondrially encoded proteins, key subunits of the oxidative phosphorylation (OXPHOS) system. Here, we identify dedicated hubs in proximity to mitoribosomal tunnel exits coordinating mitochondrial protein biogenesis and quality control. Conserved prohibitin (PHB)/m-AAA protease supercomplexes and the availability of assembly chaperones determine the fate of newly synthesized proteins by molecular triaging. The localization of these competing activities in the vicinity of the mitoribosomal tunnel exit allows for a prompt decision on whether newly synthesized proteins are fed into OXPHOS assembly or are degraded.
Collapse
Affiliation(s)
- Andreas Kohler
- Department of Biochemistry and Biophysics, Stockholm University, 106 91 Stockholm, Sweden; Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - Andreas Carlström
- Department of Biochemistry and Biophysics, Stockholm University, 106 91 Stockholm, Sweden
| | - Hendrik Nolte
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Verena Kohler
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 106 91 Stockholm, Sweden
| | - Sung-Jun Jung
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, 405 30 Gothenburg, Sweden
| | - Sagar Sridhara
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, 405 30 Gothenburg, Sweden
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Jens Berndtsson
- Department of Biochemistry and Biophysics, Stockholm University, 106 91 Stockholm, Sweden
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany.
| | - Martin Ott
- Department of Biochemistry and Biophysics, Stockholm University, 106 91 Stockholm, Sweden; Department of Medical Biochemistry and Cell Biology, University of Gothenburg, 405 30 Gothenburg, Sweden.
| |
Collapse
|
2
|
Miliara X, Tatsuta T, Eiyama A, Langer T, Rouse SL, Matthews S. An intermolecular hydrogen bonded network in the PRELID-TRIAP protein family plays a role in lipid sensing. Biochim Biophys Acta Proteins Proteom 2023; 1871:140867. [PMID: 36309326 DOI: 10.1016/j.bbapap.2022.140867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 11/06/2022]
Abstract
The PRELID-TRIAP1 family of proteins is responsible for lipid transfer in mitochondria. Multiple structures have been resolved of apo and lipid substrate bound forms, allowing us to begin to piece together the molecular level details of the full lipid transfer cycle. Here, we used molecular dynamics simulations to demonstrate that the lipid binding is mediated by an extended, water-mediated hydrogen bonding network. A key mutation, R53E, was found to disrupt this network, causing lipid to be released from the complex. The X-ray crystal structure of R53E was captured in a fully closed and apo state. Lipid transfer assays and molecular simulations allow us to interpret the observed conformation in the context of the biological role. Together, our work provides further understanding of the mechanistic control of lipid transport by PRELID-TRIAP1 in mitochondria.
Collapse
Affiliation(s)
- Xeni Miliara
- Department of Life Sciences, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany
| | - Akinori Eiyama
- Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), D-50931 Cologne, Germany
| | - Sarah L Rouse
- Department of Life Sciences, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Steve Matthews
- Department of Life Sciences, Imperial College London, South Kensington, London SW7 2AZ, UK.
| |
Collapse
|
3
|
Deshwal S, Onishi M, Tatsuta T, Bartsch T, Cors E, Ried K, Lemke K, Nolte H, Giavalisco P, Langer T. Mitochondria regulate intracellular coenzyme Q transport and ferroptotic resistance via STARD7. Nat Cell Biol 2023; 25:246-257. [PMID: 36658222 PMCID: PMC9928583 DOI: 10.1038/s41556-022-01071-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 12/06/2022] [Indexed: 01/21/2023]
Abstract
Coenzyme Q (or ubiquinone) is a redox-active lipid that serves as universal electron carrier in the mitochondrial respiratory chain and antioxidant in the plasma membrane limiting lipid peroxidation and ferroptosis. Mechanisms allowing cellular coenzyme Q distribution after synthesis within mitochondria are not understood. Here we identify the cytosolic lipid transfer protein STARD7 as a critical factor of intracellular coenzyme Q transport and suppressor of ferroptosis. Dual localization of STARD7 to the intermembrane space of mitochondria and the cytosol upon cleavage by the rhomboid protease PARL ensures the synthesis of coenzyme Q in mitochondria and its transport to the plasma membrane. While mitochondrial STARD7 preserves coenzyme Q synthesis, oxidative phosphorylation function and cristae morphogenesis, cytosolic STARD7 is required for the transport of coenzyme Q to the plasma membrane and protects against ferroptosis. A coenzyme Q variant competes with phosphatidylcholine for binding to purified STARD7 in vitro. Overexpression of cytosolic STARD7 increases ferroptotic resistance of the cells, but limits coenzyme Q abundance in mitochondria and respiratory cell growth. Our findings thus demonstrate the need to coordinate coenzyme Q synthesis and cellular distribution by PARL-mediated STARD7 processing and identify PARL and STARD7 as promising targets to interfere with ferroptosis.
Collapse
Affiliation(s)
- Soni Deshwal
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Mashun Onishi
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Takashi Tatsuta
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Tim Bartsch
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Eileen Cors
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Katharina Ried
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Kathrin Lemke
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Hendrik Nolte
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Patrick Giavalisco
- grid.419502.b0000 0004 0373 6590Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, Cologne, Germany. .,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
| |
Collapse
|
4
|
König T, Nolte H, Aaltonen MJ, Tatsuta T, Krols M, Stroh T, Langer T, McBride HM. MIROs and DRP1 drive mitochondrial-derived vesicle biogenesis and promote quality control. Nat Cell Biol 2021; 23:1271-1286. [PMID: 34873283 DOI: 10.1038/s41556-021-00798-4] [Citation(s) in RCA: 89] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 10/19/2021] [Indexed: 12/11/2022]
Abstract
Mitochondrial-derived vesicles (MDVs) are implicated in diverse physiological processes-for example, mitochondrial quality control-and are linked to various neurodegenerative diseases. However, their specific cargo composition and complex molecular biogenesis are still unknown. Here we report the proteome and lipidome of steady-state TOMM20+ MDVs. We identified 107 high-confidence MDV cargoes, which include all β-barrel proteins and the TOM import complex. MDV cargoes are delivered as fully assembled complexes to lysosomes, thus representing a selective mitochondrial quality control mechanism for multi-subunit complexes, including the TOM machinery. Moreover, we define key biogenesis steps of phosphatidic acid-enriched MDVs starting with the MIRO1/2-dependent formation of thin membrane protrusions pulled along microtubule filaments, followed by MID49/MID51/MFF-dependent recruitment of the dynamin family GTPase DRP1 and finally DRP1-dependent scission. In summary, we define the function of MDVs in mitochondrial quality control and present a mechanistic model for global GTPase-driven MDV biogenesis.
Collapse
Affiliation(s)
- Tim König
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Hendrik Nolte
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Mari J Aaltonen
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Michiel Krols
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Thomas Stroh
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Heidi M McBride
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.
| |
Collapse
|
5
|
Cretin E, Lopes P, Vimont E, Tatsuta T, Langer T, Gazi A, Sachse M, Yu‐Wai‐Man P, Reynier P, Wai T. High-throughput screening identifies suppressors of mitochondrial fragmentation in OPA1 fibroblasts. EMBO Mol Med 2021; 13:e13579. [PMID: 34014035 PMCID: PMC8185549 DOI: 10.15252/emmm.202013579] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 03/29/2021] [Accepted: 04/01/2021] [Indexed: 12/22/2022] Open
Abstract
Mutations in OPA1 cause autosomal dominant optic atrophy (DOA) as well as DOA+, a phenotype characterized by more severe neurological deficits. OPA1 deficiency causes mitochondrial fragmentation and also disrupts cristae, respiration, mitochondrial DNA (mtDNA) maintenance, and cell viability. It has not yet been established whether phenotypic severity can be modulated by genetic modifiers of OPA1. We screened the entire known mitochondrial proteome (1,531 genes) to identify genes that control mitochondrial morphology using a first-in-kind imaging pipeline. We identified 145 known and novel candidate genes whose depletion promoted elongation or fragmentation of the mitochondrial network in control fibroblasts and 91 in DOA+ patient fibroblasts that prevented mitochondrial fragmentation, including phosphatidyl glycerophosphate synthase (PGS1). PGS1 depletion reduces CL content in mitochondria and rebalances mitochondrial dynamics in OPA1-deficient fibroblasts by inhibiting mitochondrial fission, which improves defective respiration, but does not rescue mtDNA depletion, cristae dysmorphology, or apoptotic sensitivity. Our data reveal that the multifaceted roles of OPA1 in mitochondria can be functionally uncoupled by modulating mitochondrial lipid metabolism, providing novel insights into the cellular relevance of mitochondrial fragmentation.
Collapse
Affiliation(s)
- Emma Cretin
- Mitochondrial Biology GroupInstitut PasteurCNRS UMR 3691ParisFrance
- Université de ParisParisFrance
| | - Priscilla Lopes
- Mitochondrial Biology GroupInstitut PasteurCNRS UMR 3691ParisFrance
| | - Elodie Vimont
- Mitochondrial Biology GroupInstitut PasteurCNRS UMR 3691ParisFrance
| | | | - Thomas Langer
- Max‐Planck‐Institute for Biology of AgeingCologneGermany
- Cologne Excellence Cluster on Cellular Stress Responses in Aging‐Associated Diseases (CECAD)University of CologneCologneGermany
| | - Anastasia Gazi
- UTechS Ultrastructural Bio ImagingInstitut PasteurParisFrance
| | - Martin Sachse
- UTechS Ultrastructural Bio ImagingInstitut PasteurParisFrance
| | - Patrick Yu‐Wai‐Man
- Cambridge Centre for Brain Repair and MRC Mitochondrial Biology UnitDepartment of Clinical NeurosciencesUniversity of CambridgeCambridgeUK
- Cambridge Eye UnitAddenbrooke's HospitalCambridge University HospitalsCambridgeUK
- Moorfields Eye HospitalLondonUK
- UCL Institute of OphthalmologyUniversity College LondonLondonUK
| | - Pascal Reynier
- Laboratoire de Biochimie et biologie moléculaireCentre Hospitalier UniversitaireAngersFrance
- Unité Mixte de Recherche MITOVASCCNRS 6015INSERM U1083Université d'AngersAngersFrance
| | - Timothy Wai
- Mitochondrial Biology GroupInstitut PasteurCNRS UMR 3691ParisFrance
- Université de ParisParisFrance
| |
Collapse
|
6
|
Laborenz J, Bykov YS, Knöringer K, Räschle M, Filker S, Prescianotto-Baschong C, Spang A, Tatsuta T, Langer T, Storchová Z, Schuldiner M, Herrmann JM. The ER protein Ema19 facilitates the degradation of nonimported mitochondrial precursor proteins. Mol Biol Cell 2021; 32:664-674. [PMID: 33596095 PMCID: PMC8108515 DOI: 10.1091/mbc.e20-11-0748] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
For the biogenesis of mitochondria, hundreds of proteins need to be targeted from the cytosol into the various compartments of this organelle. The intramitochondrial targeting routes these proteins take to reach their respective location in the organelle are well understood. However, the early targeting processes, from cytosolic ribosomes to the membrane of the organelle, are still largely unknown. In this study, we present evidence that an integral membrane protein of the endoplasmic reticulum (ER), Ema19, plays a role in this process. Mutants lacking Ema19 show an increased stability of mitochondrial precursor proteins, indicating that Ema19 promotes the proteolytic degradation of nonproductive precursors. The deletion of Ema19 improves the growth of respiration-deficient cells, suggesting that Ema19-mediated degradation can compete with productive protein import into mitochondria. Ema19 is the yeast representative of a conserved protein family. The human Ema19 homologue is known as sigma 2 receptor or TMEM97. Though its molecular function is not known, previous studies suggested a role of the sigma 2 receptor as a quality control factor in the ER, compatible with our observations about Ema19. More globally, our data provide an additional demonstration of the important role of the ER in mitochondrial protein targeting.
Collapse
Affiliation(s)
- Janina Laborenz
- Cell Biology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Yury S Bykov
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | | | - Markus Räschle
- Molecular Genetics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Sabine Filker
- Molecular Ecology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | | | - Anne Spang
- Biozentrum, University of Basel, CH-4056 Basel, Switzerland
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Zuzana Storchová
- Molecular Genetics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Maya Schuldiner
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | | |
Collapse
|
7
|
Eiyama A, Aaltonen MJ, Nolte H, Tatsuta T, Langer T. Disturbed intramitochondrial phosphatidic acid transport impairs cellular stress signaling. J Biol Chem 2021; 296:100335. [PMID: 33497623 PMCID: PMC7949116 DOI: 10.1016/j.jbc.2021.100335] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/11/2021] [Accepted: 01/22/2021] [Indexed: 01/18/2023] Open
Abstract
Lipid transfer proteins of the Ups1/PRELID1 family facilitate the transport of phospholipids across the intermembrane space of mitochondria in a lipid-specific manner. Heterodimeric complexes of yeast Ups1/Mdm35 or human PRELID1/TRIAP1 shuttle phosphatidic acid (PA) mainly synthesized in the endoplasmic reticulum (ER) to the inner membrane, where it is converted to cardiolipin (CL), the signature phospholipid of mitochondria. Loss of Ups1/PRELID1 proteins impairs the accumulation of CL and broadly affects mitochondrial structure and function. Unexpectedly and unlike yeast cells lacking the CL synthase Crd1, Ups1-deficient yeast cells exhibit glycolytic growth defects, pointing to functions of Ups1-mediated PA transfer beyond CL synthesis. Here, we show that the disturbed intramitochondrial transport of PA in ups1Δ cells leads to altered unfolded protein response (UPR) and mTORC1 signaling, independent of disturbances in CL synthesis. The impaired flux of PA into mitochondria is associated with the increased synthesis of phosphatidylcholine and a reduced phosphatidylethanolamine/phosphatidylcholine ratio in the ER of ups1Δ cells which suppresses the UPR. Moreover, we observed inhibition of target of rapamycin complex 1 (TORC1) signaling in these cells. Activation of either UPR by ER protein stress or of TORC1 signaling by disruption of its negative regulator, the Seh1-associated complex inhibiting TORC1 complex, increased cytosolic protein synthesis, and restored glycolytic growth of ups1Δ cells. These results demonstrate that PA influx into mitochondria is required to preserve ER membrane homeostasis and that its disturbance is associated with impaired glycolytic growth and cellular stress signaling.
Collapse
Affiliation(s)
- Akinori Eiyama
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Mari J Aaltonen
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Hendrik Nolte
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Takashi Tatsuta
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Thomas Langer
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.
| |
Collapse
|
8
|
MacVicar T, Ohba Y, Nolte H, Mayer FC, Tatsuta T, Sprenger HG, Lindner B, Zhao Y, Li J, Bruns C, Krüger M, Habich M, Riemer J, Schwarzer R, Pasparakis M, Henschke S, Brüning JC, Zamboni N, Langer T. Lipid signalling drives proteolytic rewiring of mitochondria by YME1L. Nature 2019; 575:361-365. [PMID: 31695197 DOI: 10.1038/s41586-019-1738-6] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 09/19/2019] [Indexed: 01/18/2023]
Abstract
Reprogramming of mitochondria provides cells with the metabolic flexibility required to adapt to various developmental transitions such as stem cell activation or immune cell reprogramming, and to respond to environmental challenges such as those encountered under hypoxic conditions or during tumorigenesis1-3. Here we show that the i-AAA protease YME1L rewires the proteome of pre-existing mitochondria in response to hypoxia or nutrient starvation. Inhibition of mTORC1 induces a lipid signalling cascade via the phosphatidic acid phosphatase LIPIN1, which decreases phosphatidylethanolamine levels in mitochondrial membranes and promotes proteolysis. YME1L degrades mitochondrial protein translocases, lipid transfer proteins and metabolic enzymes to acutely limit mitochondrial biogenesis and support cell growth. YME1L-mediated mitochondrial reshaping supports the growth of pancreatic ductal adenocarcinoma (PDAC) cells as spheroids or xenografts. Similar changes to the mitochondrial proteome occur in the tumour tissues of patients with PDAC, suggesting that YME1L is relevant to the pathophysiology of these tumours. Our results identify the mTORC1-LIPIN1-YME1L axis as a post-translational regulator of mitochondrial proteostasis at the interface between metabolism and mitochondrial dynamics.
Collapse
Affiliation(s)
- Thomas MacVicar
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Yohsuke Ohba
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Hendrik Nolte
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany.,Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | | | - Takashi Tatsuta
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Hans-Georg Sprenger
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany.,Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Barbara Lindner
- Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Yue Zhao
- Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, Cologne, Germany
| | - Jiahui Li
- Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, Cologne, Germany
| | - Christiane Bruns
- Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, Cologne, Germany
| | - Marcus Krüger
- Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Center for Molecular Medicine, University of Cologne, Cologne, Germany
| | - Markus Habich
- Institute for Biochemistry, University of Cologne, Cologne, Germany
| | - Jan Riemer
- Institute for Biochemistry, University of Cologne, Cologne, Germany
| | - Robin Schwarzer
- Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Manolis Pasparakis
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany.,Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Center for Molecular Medicine, University of Cologne, Cologne, Germany
| | - Sinika Henschke
- Max-Planck-Institute for Metabolism Research, Cologne, Germany
| | - Jens C Brüning
- Center for Molecular Medicine, University of Cologne, Cologne, Germany.,Max-Planck-Institute for Metabolism Research, Cologne, Germany.,Center for Endocrinology, Diabetes and Preventive Medicine (CEPD), University Hospital of Cologne, Cologne, Germany
| | - Nicola Zamboni
- Molecular Systems Biology, ETH Zürich, Zürich, Switzerland
| | - Thomas Langer
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany. .,Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany. .,Center for Molecular Medicine, University of Cologne, Cologne, Germany.
| |
Collapse
|
9
|
Hahn O, Drews LF, Nguyen A, Tatsuta T, Gkioni L, Hendrich O, Zhang Q, Langer T, Pletcher S, Wakelam MJO, Beyer A, Grönke S, Partridge L. A nutritional memory effect counteracts benefits of dietary restriction in old mice. Nat Metab 2019; 1:1059-1073. [PMID: 31742247 PMCID: PMC6861129 DOI: 10.1038/s42255-019-0121-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Dietary restriction (DR) during adulthood can greatly extend lifespan and improve metabolic health in diverse species. However, whether DR in mammals is still effective when applied for the first time at old age remains elusive. Here, we report results of a late-life DR switch experiment employing 800 mice, in which 24 months old female mice were switched from ad libitum (AL) to DR or vice versa. Strikingly, the switch from DR-to-AL acutely increases mortality, whereas the switch from AL-to-DR causes only a weak and gradual increase in survival, suggesting a memory of earlier nutrition. RNA-seq profiling in liver, brown (BAT) and white adipose tissue (WAT) demonstrate a largely refractory transcriptional and metabolic response to DR after AL feeding in fat tissue, particularly in WAT, and a proinflammatory signature in aged preadipocytes, which is prevented by chronic DR feeding. Our results provide evidence for a nutritional memory as a limiting factor for DR-induced longevity and metabolic remodeling of WAT in mammals.
Collapse
Affiliation(s)
- Oliver Hahn
- Max Planck Institute for Biology of Ageing, Cologne, Germany
- Cellular Networks and Systems Biology, CECAD, University of Cologne, Cologne, Germany
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Lisa F Drews
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - An Nguyen
- Inositide lab, The Babraham Institute, Cambridge, UK
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Lisonia Gkioni
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Oliver Hendrich
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Qifeng Zhang
- Inositide lab, The Babraham Institute, Cambridge, UK
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, Cologne, Germany
| | - Scott Pletcher
- Department of Molecular & Integrative Physiology and the Geriatrics Center, University of Michigan, Ann Arbor, USA
| | | | - Andreas Beyer
- Cellular Networks and Systems Biology, CECAD, University of Cologne, Cologne, Germany.
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany.
| | | | - Linda Partridge
- Max Planck Institute for Biology of Ageing, Cologne, Germany.
- Department of Genetics, Evolution and Environment, Institute of Healthy Ageing, University College London, London, UK.
| |
Collapse
|
10
|
Odendall F, Backes S, Tatsuta T, Weill U, Schuldiner M, Langer T, Herrmann JM, Rapaport D, Dimmer KS. The mitochondrial intermembrane space-facing proteins Mcp2 and Tgl2 are involved in yeast lipid metabolism. Mol Biol Cell 2019; 30:2681-2694. [PMID: 31483742 PMCID: PMC6761770 DOI: 10.1091/mbc.e19-03-0166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Mitochondria are unique organelles harboring two distinct membranes, the mitochondrial inner and outer membrane (MIM and MOM, respectively). Mitochondria comprise only a subset of metabolic pathways for the synthesis of membrane lipids; therefore most lipid species and their precursors have to be imported from other cellular compartments. One such import process is mediated by the ER mitochondria encounter structure (ERMES) complex. Both mitochondrial membranes surround the hydrophilic intermembrane space (IMS). Therefore, additional systems are required that shuttle lipids between the MIM and MOM. Recently, we identified the IMS protein Mcp2 as a high-copy suppressor for cells that lack a functional ERMES complex. To understand better how mitochondria facilitate transport and biogenesis of lipids, we searched for genetic interactions of this suppressor. We found that MCP2 has a negative genetic interaction with the gene TGL2 encoding a neutral lipid hydrolase. We show that this lipase is located in the intermembrane space of the mitochondrion and is imported via the Mia40 disulfide relay system. Furthermore, we show a positive genetic interaction of double deletion of MCP2 and PSD1, the gene encoding the enzyme that synthesizes the major amount of cellular phosphatidylethanolamine. Finally, we demonstrate that the nucleotide-binding motifs of the predicted atypical kinase Mcp2 are required for its proper function. Taken together, our data suggest that Mcp2 is involved in mitochondrial lipid metabolism and an increase of this involvement by overexpression suppresses loss of ERMES.
Collapse
Affiliation(s)
- Fenja Odendall
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany
| | - Sandra Backes
- Cell Biology, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Takashi Tatsuta
- Max Planck Institute for Biology of Ageing, 50931 Köln, Germany
| | - Uri Weill
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Maya Schuldiner
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Thomas Langer
- Max Planck Institute for Biology of Ageing, 50931 Köln, Germany
| | | | - Doron Rapaport
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany
| | - Kai Stefan Dimmer
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076 Tübingen, Germany
| |
Collapse
|
11
|
Miliara X, Tatsuta T, Berry JL, Rouse SL, Solak K, Chorev DS, Wu D, Robinson CV, Matthews S, Langer T. Structural determinants of lipid specificity within Ups/PRELI lipid transfer proteins. Nat Commun 2019; 10:1130. [PMID: 30850607 PMCID: PMC6408443 DOI: 10.1038/s41467-019-09089-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 02/18/2019] [Indexed: 02/07/2023] Open
Abstract
Conserved lipid transfer proteins of the Ups/PRELI family regulate lipid accumulation in mitochondria by shuttling phospholipids in a lipid-specific manner across the intermembrane space. Here, we combine structural analysis, unbiased genetic approaches in yeast and molecular dynamics simulations to unravel determinants of lipid specificity within the conserved Ups/PRELI family. We present structures of human PRELID1-TRIAP1 and PRELID3b-TRIAP1 complexes, which exert lipid transfer activity for phosphatidic acid and phosphatidylserine, respectively. Reverse yeast genetic screens identify critical amino acid exchanges that broaden and swap their lipid specificities. We find that amino acids involved in head group recognition and the hydrophobicity of flexible loops regulate lipid entry into the binding cavity. Molecular dynamics simulations reveal different membrane orientations of PRELID1 and PRELID3b during the stepwise release of lipids. Our experiments thus define the structural determinants of lipid specificity and the dynamics of lipid interactions by Ups/PRELI proteins.
Collapse
Affiliation(s)
- Xeni Miliara
- Department of Life Sciences, Imperial College London, Sir Ernst Chain Building, South Kensington, London, SW7 2AZ, UK
| | - Takashi Tatsuta
- Max-Planck-Institute for Biology of Ageing, Joseph-Stelzmann-Str. 9b, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
| | - Jamie-Lee Berry
- Department of Life Sciences, Imperial College London, Sir Ernst Chain Building, South Kensington, London, SW7 2AZ, UK
| | - Sarah L Rouse
- Department of Life Sciences, Imperial College London, Sir Ernst Chain Building, South Kensington, London, SW7 2AZ, UK
| | - Kübra Solak
- Max-Planck-Institute for Biology of Ageing, Joseph-Stelzmann-Str. 9b, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany
| | - Dror S Chorev
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3TA, UK
| | - Di Wu
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3TA, UK
| | - Carol V Robinson
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3TA, UK
| | - Stephen Matthews
- Department of Life Sciences, Imperial College London, Sir Ernst Chain Building, South Kensington, London, SW7 2AZ, UK.
| | - Thomas Langer
- Max-Planck-Institute for Biology of Ageing, Joseph-Stelzmann-Str. 9b, 50931, Cologne, Germany.
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, Joseph-Stelzmann-Str. 26, 50931, Cologne, Germany.
| |
Collapse
|
12
|
Rashid T, Nemazanyy I, Paolini C, Tatsuta T, Crespin P, de Villeneuve D, Brodesser S, Benit P, Rustin P, Baraibar MA, Agbulut O, Olivier A, Protasi F, Langer T, Chrast R, de Lonlay P, de Foucauld H, Blaauw B, Pende M. Lipin1 deficiency causes sarcoplasmic reticulum stress and chaperone-responsive myopathy. EMBO J 2019; 38:e99576. [PMID: 30420558 PMCID: PMC6315296 DOI: 10.15252/embj.201899576] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 09/21/2018] [Accepted: 10/02/2018] [Indexed: 12/20/2022] Open
Abstract
As a consequence of impaired glucose or fatty acid metabolism, bioenergetic stress in skeletal muscles may trigger myopathy and rhabdomyolysis. Genetic mutations causing loss of function of the LPIN1 gene frequently lead to severe rhabdomyolysis bouts in children, though the metabolic alterations and possible therapeutic interventions remain elusive. Here, we show that lipin1 deficiency in mouse skeletal muscles is sufficient to trigger myopathy. Strikingly, muscle fibers display strong accumulation of both neutral and phospholipids. The metabolic lipid imbalance can be traced to an altered fatty acid synthesis and fatty acid oxidation, accompanied by a defect in acyl chain elongation and desaturation. As an underlying cause, we reveal a severe sarcoplasmic reticulum (SR) stress, leading to the activation of the lipogenic SREBP1c/SREBP2 factors, the accumulation of the Fgf21 cytokine, and alterations of SR-mitochondria morphology. Importantly, pharmacological treatments with the chaperone TUDCA and the fatty acid oxidation activator bezafibrate improve muscle histology and strength of lipin1 mutants. Our data reveal that SR stress and alterations in SR-mitochondria contacts are contributing factors and potential intervention targets of the myopathy associated with lipin1 deficiency.
Collapse
Affiliation(s)
- Talha Rashid
- Institut Necker-Enfants Malades, Paris, France
- Inserm, U1151, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
- Sanofi R&D, Translational Sciences Unit, In Silico Biology, Chilly-Mazarin, France
| | - Ivan Nemazanyy
- Platform for Metabolic Analyses, Institut Necker-Enfants Malades, Paris, France
| | - Cecilia Paolini
- Center for Research on Ageing and Translational Medicine (CeSI-MeT), Department of Neuroscience, Imaging, and Clinical Sciences (DNICS), University G. d' Annunzio of Chieti, Chieti, Italy
| | - Takashi Tatsuta
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Paul Crespin
- Institut Necker-Enfants Malades, Paris, France
- Inserm, U1151, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Delphine de Villeneuve
- Institut Necker-Enfants Malades, Paris, France
- Inserm, U1151, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Susanne Brodesser
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Paule Benit
- INSERM, UMR 1141, Hôpital Robert Debré, Paris, France
| | - Pierre Rustin
- INSERM, UMR 1141, Hôpital Robert Debré, Paris, France
| | | | - Onnik Agbulut
- CNRS, Institut de Biologie Paris-Seine (IBPS), Biological Adaptation and Ageing, Sorbonne Université, Paris, France
| | - Anne Olivier
- Sanofi R&D, Translational Sciences Unit, In Silico Biology, Chilly-Mazarin, France
| | - Feliciano Protasi
- Center for Research on Ageing and Translational Medicine (CeSI-MeT), Department of Neuroscience, Imaging, and Clinical Sciences (DNICS), University G. d' Annunzio of Chieti, Chieti, Italy
| | - Thomas Langer
- Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| | - Roman Chrast
- Department of Neuroscience and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Pascale de Lonlay
- Institut Necker-Enfants Malades, Paris, France
- Inserm, U1151, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Helene de Foucauld
- Sanofi R&D, Translational Sciences Unit, In Silico Biology, Chilly-Mazarin, France
| | - Bert Blaauw
- Department of Biomedical Sciences, Venetian Institute of Molecular Medicine, University of Padova, Padova, Italy
| | - Mario Pende
- Institut Necker-Enfants Malades, Paris, France
- Inserm, U1151, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| |
Collapse
|
13
|
Saita S, Tatsuta T, Lampe PA, König T, Ohba Y, Langer T. PARL partitions the lipid transfer protein STARD7 between the cytosol and mitochondria. EMBO J 2018; 37:embj.201797909. [PMID: 29301859 DOI: 10.15252/embj.201797909] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 12/12/2017] [Accepted: 12/13/2017] [Indexed: 11/09/2022] Open
Abstract
Intramembrane-cleaving peptidases of the rhomboid family regulate diverse cellular processes that are critical for development and cell survival. The function of the rhomboid protease PARL in the mitochondrial inner membrane has been linked to mitophagy and apoptosis, but other regulatory functions are likely to exist. Here, we identify the START domain-containing protein STARD7 as an intramitochondrial lipid transfer protein for phosphatidylcholine. We demonstrate that PARL-mediated cleavage during mitochondrial import partitions STARD7 to the cytosol and the mitochondrial intermembrane space. Negatively charged amino acids in STARD7 serve as a sorting signal allowing mitochondrial release of mature STARD7 upon cleavage by PARL On the other hand, membrane insertion of STARD7 mediated by the TIM23 complex promotes mitochondrial localization of mature STARD7. Mitochondrial STARD7 is necessary and sufficient for the accumulation of phosphatidylcholine in the inner membrane and for the maintenance of respiration and cristae morphogenesis. Thus, PARL preserves mitochondrial membrane homeostasis via STARD7 processing and is emerging as a critical regulator of protein localization between mitochondria and the cytosol.
Collapse
Affiliation(s)
- Shotaro Saita
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Takashi Tatsuta
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Philipp A Lampe
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Tim König
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Yohsuke Ohba
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Thomas Langer
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany .,Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany.,Max-Planck-Institute for Biology of Ageing, Cologne, Germany
| |
Collapse
|
14
|
Vukotic M, Nolte H, König T, Saita S, Ananjew M, Krüger M, Tatsuta T, Langer T. Acylglycerol Kinase Mutated in Sengers Syndrome Is a Subunit of the TIM22 Protein Translocase in Mitochondria. Mol Cell 2017; 67:471-483.e7. [DOI: 10.1016/j.molcel.2017.06.013] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 05/13/2017] [Accepted: 06/13/2017] [Indexed: 11/15/2022]
|
15
|
Aaltonen MJ, Friedman JR, Osman C, Salin B, di Rago JP, Nunnari J, Langer T, Tatsuta T. MICOS and phospholipid transfer by Ups2-Mdm35 organize membrane lipid synthesis in mitochondria. J Cell Biol 2016; 213:525-34. [PMID: 27241913 PMCID: PMC4896057 DOI: 10.1083/jcb.201602007] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 05/10/2016] [Indexed: 11/22/2022] Open
Abstract
Mitochondria exert critical functions in cellular lipid metabolism and promote the synthesis of major constituents of cellular membranes, such as phosphatidylethanolamine (PE) and phosphatidylcholine. Here, we demonstrate that the phosphatidylserine decarboxylase Psd1, located in the inner mitochondrial membrane, promotes mitochondrial PE synthesis via two pathways. First, Ups2-Mdm35 complexes (SLMO2-TRIAP1 in humans) serve as phosphatidylserine (PS)-specific lipid transfer proteins in the mitochondrial intermembrane space, allowing formation of PE by Psd1 in the inner membrane. Second, Psd1 decarboxylates PS in the outer membrane in trans, independently of PS transfer by Ups2-Mdm35. This latter pathway requires close apposition between both mitochondrial membranes and the mitochondrial contact site and cristae organizing system (MICOS). In MICOS-deficient cells, limiting PS transfer by Ups2-Mdm35 and reducing mitochondrial PE accumulation preserves mitochondrial respiration and cristae formation. These results link mitochondrial PE metabolism to MICOS, combining functions in protein and lipid homeostasis to preserve mitochondrial structure and function.
Collapse
Affiliation(s)
- Mari J Aaltonen
- Institute of Genetics, University of Cologne, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany
| | - Jonathan R Friedman
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA 95616
| | - Christof Osman
- Institute of Genetics, University of Cologne, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany
| | - Bénédicte Salin
- Institut de Biochimie et Génétique Cellulaires, Centre National de la Recherche Scientifique UMR5095, Université Bordeaux Segalen, Bordeaux 33077, France
| | - Jean-Paul di Rago
- Institut de Biochimie et Génétique Cellulaires, Centre National de la Recherche Scientifique UMR5095, Université Bordeaux Segalen, Bordeaux 33077, France
| | - Jodi Nunnari
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA 95616
| | - Thomas Langer
- Institute of Genetics, University of Cologne, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany Center for Molecular Medicine, University of Cologne, 50931 Cologne, Germany
| | - Takashi Tatsuta
- Institute of Genetics, University of Cologne, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany
| |
Collapse
|
16
|
Velázquez AP, Tatsuta T, Ghillebert R, Drescher I, Graef M. Lipid droplet–mediated ER homeostasis regulates autophagy and cell survival during starvation. J Exp Med 2016. [DOI: 10.1084/jem.2134oia27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
17
|
Velázquez AP, Tatsuta T, Ghillebert R, Drescher I, Graef M. Lipid droplet-mediated ER homeostasis regulates autophagy and cell survival during starvation. J Cell Biol 2016; 212:621-31. [PMID: 26953354 PMCID: PMC4792078 DOI: 10.1083/jcb.201508102] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 02/10/2016] [Indexed: 12/14/2022] Open
Abstract
Biochemical, cytological, and lipidomic approaches show that lipid droplets are dispensable as membrane sources for autophagy, but are required for ER homeostasis by buffering fatty acid synthesis and ER stress and maintaining phospholipid composition to allow autophagy regulation and autophagosome biogenesis. Lipid droplets (LDs) are conserved organelles for intracellular neutral lipid storage. Recent studies suggest that LDs function as direct lipid sources for autophagy, a central catabolic process in homeostasis and stress response. Here, we demonstrate that LDs are dispensable as a membrane source for autophagy, but fulfill critical functions for endoplasmic reticulum (ER) homeostasis linked to autophagy regulation. In the absence of LDs, yeast cells display alterations in their phospholipid composition and fail to buffer de novo fatty acid (FA) synthesis causing chronic stress and morphologic changes in the ER. These defects compromise regulation of autophagy, including formation of multiple aberrant Atg8 puncta and drastically impaired autophagosome biogenesis, leading to severe defects in nutrient stress survival. Importantly, metabolically corrected phospholipid composition and improved FA resistance of LD-deficient cells cure autophagy and cell survival. Together, our findings provide novel insight into the complex interrelation between LD-mediated lipid homeostasis and the regulation of autophagy potentially relevant for neurodegenerative and metabolic diseases.
Collapse
Affiliation(s)
| | - Takashi Tatsuta
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany
| | - Ruben Ghillebert
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Ingmar Drescher
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Martin Graef
- Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, 50931 Cologne, Germany
| |
Collapse
|
18
|
Miliara X, Garnett JA, Tatsuta T, Abid Ali F, Baldie H, Pérez-Dorado I, Simpson P, Yague E, Langer T, Matthews S. Structural insight into the TRIAP1/PRELI-like domain family of mitochondrial phospholipid transfer complexes. EMBO Rep 2015; 16:824-35. [PMID: 26071602 PMCID: PMC4515122 DOI: 10.15252/embr.201540229] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 05/20/2015] [Indexed: 11/09/2022] Open
Abstract
The composition of the mitochondrial membrane is important for its architecture and proper function. Mitochondria depend on a tightly regulated supply of phospholipid via intra-mitochondrial synthesis and by direct import from the endoplasmic reticulum. The Ups1/PRELI-like family together with its mitochondrial chaperones (TRIAP1/Mdm35) represent a unique heterodimeric lipid transfer system that is evolutionary conserved from yeast to man. Work presented here provides new atomic resolution insight into the function of a human member of this system. Crystal structures of free TRIAP1 and the TRIAP1-SLMO1 complex reveal how the PRELI domain is chaperoned during import into the intermembrane mitochondrial space. The structural resemblance of PRELI-like domain of SLMO1 with that of mammalian phoshatidylinositol transfer proteins (PITPs) suggest that they share similar lipid transfer mechanisms, in which access to a buried phospholipid-binding cavity is regulated by conformationally adaptable loops.
Collapse
Affiliation(s)
- Xeni Miliara
- Department of Life Sciences, Imperial College London, London, UK
| | - James A Garnett
- Department of Life Sciences, Imperial College London, London, UK School of Biological and Chemical Sciences, Joseph Priestley Building Queen Mary University of London, London, UK
| | - Takashi Tatsuta
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Ferdos Abid Ali
- Department of Life Sciences, Imperial College London, London, UK
| | - Heather Baldie
- Department of Life Sciences, Imperial College London, London, UK
| | | | - Peter Simpson
- Department of Life Sciences, Imperial College London, London, UK
| | - Ernesto Yague
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Thomas Langer
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Stephen Matthews
- Department of Life Sciences, Imperial College London, London, UK
| |
Collapse
|
19
|
Mancini C, Orsi L, Guo Y, Li J, Chen Y, Wang F, Tian L, Liu X, Zhang J, Jiang H, Nmezi BS, Tatsuta T, Giorgio E, Di Gregorio E, Cavalieri S, Pozzi E, Mortara P, Caglio MM, Balducci A, Pinessi L, Langer T, Padiath QS, Hakonarson H, Zhang X, Brusco A. An atypical form of AOA2 with myoclonus associated with mutations in SETX and AFG3L2. BMC Med Genet 2015; 16:16. [PMID: 25927548 PMCID: PMC4422141 DOI: 10.1186/s12881-015-0159-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 02/26/2015] [Indexed: 11/10/2022]
Abstract
BACKGROUND Hereditary ataxias are a heterogeneous group of neurodegenerative disorders, where exome sequencing may become an important diagnostic tool to solve clinically or genetically complex cases. METHODS We describe an Italian family in which three sisters were affected by ataxia with postural/intentional myoclonus and involuntary movements at onset, which persisted during the disease. Oculomotor apraxia was absent. Clinical and genetic data did not allow us to exclude autosomal dominant or recessive inheritance and suggest a disease gene. RESULTS Exome sequencing identified a homozygous c.6292C > T (p.Arg2098*) mutation in SETX and a heterozygous c.346G > A (p.Gly116Arg) mutation in AFG3L2 shared by all three affected individuals. A fourth sister (II.7) had subclinical myoclonic jerks at proximal upper limbs and perioral district, confirmed by electrophysiology, and carried the p.Gly116Arg change. Three siblings were healthy. Pathogenicity prediction and a yeast-functional assay suggested p.Gly116Arg impaired m-AAA (ATPases associated with various cellular activities) complex function. CONCLUSIONS Exome sequencing is a powerful tool in identifying disease genes. We identified an atypical form of Ataxia with Oculoapraxia type 2 (AOA2) with myoclonus at onset associated with the c.6292C > T (p.Arg2098*) homozygous mutation. Because the same genotype was described in six cases from a Tunisian family with a typical AOA2 without myoclonus, we speculate this latter feature is associated with a second mutated gene, namely AFG3L2 (p.Gly116Arg variant). We suggest that variant phenotypes may be due to the combined effect of different mutated genes associated to ataxia or related disorders, that will become more apparent as the costs of exome sequencing progressively will reduce, amplifying its diagnostics use, and meanwhile proposing significant challenges in the interpretation of the data.
Collapse
Affiliation(s)
- Cecilia Mancini
- Department of Medical Sciences, University of Torino, via Santena 19, 10126, Torino, Italy.
| | - Laura Orsi
- Struttura Complessa Neurologia I, Department of Neuroscience and Mental Health, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| | - Yiran Guo
- Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
| | | | | | - Fengxiang Wang
- Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
| | - Lifeng Tian
- Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
| | | | | | - Hui Jiang
- BGI-Shenzhen, Shenzhen, 510803, China. .,Shenzhen Key Laboratory of Genomics, Shenzhen, 518083, China. .,The Guangdong Enterprise Key Laboratory of Human Disease Genomics, BGI-Shenzhen, Shenzhen, 510803, China.
| | - Bruce Shike Nmezi
- Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, 15261, USA.
| | - Takashi Tatsuta
- Institute for Genetics, Center for Molecular Medicine (CMMC), Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, 50931, Germany.
| | - Elisa Giorgio
- Department of Medical Sciences, University of Torino, via Santena 19, 10126, Torino, Italy.
| | - Eleonora Di Gregorio
- Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| | - Simona Cavalieri
- Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| | - Elisa Pozzi
- Department of Medical Sciences, University of Torino, via Santena 19, 10126, Torino, Italy.
| | - Paolo Mortara
- Struttura Complessa Neurologia I, Department of Neuroscience and Mental Health, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy. .,Department of Neuroscience, University of Torino, Torino, 10126, Italy.
| | - Maria Marcella Caglio
- Department of Neuroscience, University of Torino, Torino, 10126, Italy. .,Division of Neurology III, Department of Neuroscience and Mental Health, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| | - Alessandro Balducci
- Department of Neuroscience, University of Torino, Torino, 10126, Italy. .,Division of Neurology III, Department of Neuroscience and Mental Health, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| | - Lorenzo Pinessi
- Struttura Complessa Neurologia I, Department of Neuroscience and Mental Health, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy. .,Department of Neuroscience, University of Torino, Torino, 10126, Italy.
| | - Thomas Langer
- Institute for Genetics, Center for Molecular Medicine (CMMC), Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, 50931, Germany. .,Max-Planck-Institute for Biology of Aging, Cologne, 50931, Germany.
| | - Quasar S Padiath
- Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, 15261, USA.
| | - Hakon Hakonarson
- Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA. .,Department of Pediatrics, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.
| | - Xiuqing Zhang
- BGI-Shenzhen, Shenzhen, 510803, China. .,Shenzhen Key Laboratory of Genomics, Shenzhen, 518083, China. .,The Guangdong Enterprise Key Laboratory of Human Disease Genomics, BGI-Shenzhen, Shenzhen, 510803, China.
| | - Alfredo Brusco
- Department of Medical Sciences, University of Torino, via Santena 19, 10126, Torino, Italy. .,Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Torino, 10126, Italy.
| |
Collapse
|
20
|
Richter-Dennerlein R, Korwitz A, Haag M, Tatsuta T, Dargazanli S, Baker M, Decker T, Lamkemeyer T, Rugarli EI, Langer T. DNAJC19, a mitochondrial cochaperone associated with cardiomyopathy, forms a complex with prohibitins to regulate cardiolipin remodeling. Cell Metab 2014; 20:158-71. [PMID: 24856930 DOI: 10.1016/j.cmet.2014.04.016] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 02/14/2014] [Accepted: 04/10/2014] [Indexed: 12/25/2022]
Abstract
Prohibitins form large protein and lipid scaffolds in the inner membrane of mitochondria that are required for mitochondrial morphogenesis, neuronal survival, and normal lifespan. Here, we have defined the interactome of PHB2 in mitochondria and identified DNAJC19, mutated in dilated cardiomyopathy with ataxia, as binding partner of PHB complexes. We observed impaired cell growth, defective cristae morphogenesis, and similar transcriptional responses in the absence of either DNAJC19 or PHB2. The loss of PHB/DNAJC19 complexes affects cardiolipin acylation and leads to the accumulation of cardiolipin species with altered acyl chains. Similar defects occur in cells lacking the transacylase tafazzin, which is mutated in Barth syndrome. Our experiments suggest that PHB/DNAJC19 membrane domains regulate cardiolipin remodeling by tafazzin and explain similar clinical symptoms in two inherited cardiomyopathies by an impaired cardiolipin metabolism in mitochondrial membranes.
Collapse
Affiliation(s)
- Ricarda Richter-Dennerlein
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Anne Korwitz
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Mathias Haag
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Takashi Tatsuta
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Sascha Dargazanli
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Michael Baker
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Thorsten Decker
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Tobias Lamkemeyer
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Elena I Rugarli
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany; Center for Molecular Medicine (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Thomas Langer
- Institute for Genetics, University of Cologne, 50931 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany; Center for Molecular Medicine (CMMC), University of Cologne, 50931 Cologne, Germany; Max-Planck-Institute for Biology of Aging, 50931 Cologne, Germany.
| |
Collapse
|
21
|
Almontashiri NAM, Chen HH, Mailloux RJ, Tatsuta T, Teng ACT, Mahmoud AB, Ho T, Stewart NAS, Rippstein P, Harper ME, Roberts R, Willenborg C, Erdmann J, Pastore A, McBride HM, Langer T, Stewart AFR. SPG7 variant escapes phosphorylation-regulated processing by AFG3L2, elevates mitochondrial ROS, and is associated with multiple clinical phenotypes. Cell Rep 2014; 7:834-47. [PMID: 24767997 DOI: 10.1016/j.celrep.2014.03.051] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 02/06/2014] [Accepted: 03/20/2014] [Indexed: 02/01/2023] Open
Abstract
Mitochondrial production of reactive oxygen species (ROS) affects many processes in health and disease. SPG7 assembles with AFG3L2 into the mAAA protease at the inner membrane of mitochondria, degrades damaged proteins, and regulates the synthesis of mitochondrial ribosomes. SPG7 is cleaved and activated by AFG3L2 upon assembly. A variant in SPG7 that replaces arginine 688 with glutamine (Q688) is associated with several phenotypes, including toxicity of chemotherapeutic agents, type 2 diabetes mellitus, and (as reported here) coronary artery disease. We demonstrate that SPG7 processing is regulated by tyrosine phosphorylation of AFG3L2. Carriers of Q688 bypass this regulation and constitutively process and activate SPG7 mAAA protease. Cells expressing Q688 produce higher ATP levels and ROS, promoting cell proliferation. Our results thus reveal an unexpected link between the phosphorylation-dependent regulation of the mitochondria mAAA protease affecting ROS production and several clinical phenotypes.
Collapse
Affiliation(s)
- Naif A M Almontashiri
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada; Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada; Center for Genetics and Inherited Diseases, Department of Applied Medical Sciences, Taibah University, Almedinah, P.O. Box 41477, Saudi Arabia
| | - Hsiao-Huei Chen
- Ottawa Hospital Research Institute, Ottawa, ON K1Y 4E9, Canada
| | - Ryan J Mailloux
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Takashi Tatsuta
- Institute for Genetics, University of Cologne, Cologne 50674, Germany
| | - Allen C T Teng
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada; Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Ahmad B Mahmoud
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Tiffany Ho
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada
| | - Nicolas A S Stewart
- Center for Clinical Pharmacology, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Peter Rippstein
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada
| | - Mary Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Robert Roberts
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada
| | | | | | | | - Annalisa Pastore
- National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | | | - Thomas Langer
- Institute for Genetics, University of Cologne, Cologne 50674, Germany
| | - Alexandre F R Stewart
- Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON K1Y, Canada; Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1H 8M5, Canada.
| |
Collapse
|
22
|
Baker MJ, Lampe PA, Stojanovski D, Korwitz A, Anand R, Tatsuta T, Langer T. Stress-induced OMA1 activation and autocatalytic turnover regulate OPA1-dependent mitochondrial dynamics. EMBO J 2014; 33:578-93. [PMID: 24550258 DOI: 10.1002/embj.201386474] [Citation(s) in RCA: 214] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The dynamic network of mitochondria fragments under stress allowing the segregation of damaged mitochondria and, in case of persistent damage, their selective removal by mitophagy. Mitochondrial fragmentation upon depolarisation of mitochondria is brought about by the degradation of central components of the mitochondrial fusion machinery. The OMA1 peptidase mediates the degradation of long isoforms of the dynamin-like GTPase OPA1 in the inner membrane. Here, we demonstrate that OMA1-mediated degradation of OPA1 is a general cellular stress response. OMA1 is constitutively active but displays strongly enhanced activity in response to various stress insults. We identify an amino terminal stress-sensor domain of OMA1, which is only present in homologues of higher eukaryotes and which modulates OMA1 proteolysis and activation. OMA1 activation is associated with its autocatalyic degradation, which initiates from both termini of OMA1 and results in complete OMA1 turnover. Autocatalytic proteolysis of OMA1 ensures the reversibility of the response and allows OPA1-mediated mitochondrial fusion to resume upon alleviation of stress. This differentiated stress response maintains the functional integrity of mitochondria and contributes to cell survival.
Collapse
Affiliation(s)
- Michael J Baker
- Institute for Genetics Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) Center for Molecular Medicine (CMMC) University of Cologne, Cologne, Germany
| | | | | | | | | | | | | |
Collapse
|
23
|
Tatsuta T, Scharwey M, Langer T. Mitochondrial lipid trafficking. Trends Cell Biol 2014; 24:44-52. [DOI: 10.1016/j.tcb.2013.07.011] [Citation(s) in RCA: 182] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 07/29/2013] [Accepted: 07/30/2013] [Indexed: 11/29/2022]
|
24
|
Potting C, Tatsuta T, König T, Haag M, Wai T, Aaltonen MJ, Langer T. TRIAP1/PRELI complexes prevent apoptosis by mediating intramitochondrial transport of phosphatidic acid. Cell Metab 2013; 18:287-95. [PMID: 23931759 DOI: 10.1016/j.cmet.2013.07.008] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Revised: 06/25/2013] [Accepted: 07/13/2013] [Indexed: 02/06/2023]
Abstract
Cardiolipin (CL), a mitochondria-specific glycerophospholipid, is required for diverse mitochondrial processes and orchestrates the function of various death-inducing proteins during apoptosis. Here, we identify a complex of the p53-regulated protein TRIAP1 (p53CSV) and PRELI in the mitochondrial intermembrane space (IMS), which ensures the accumulation of CL in mitochondria. TRIAP1/PRELI complexes exert lipid transfer activity in vitro and supply phosphatidic acid (PA) for CL synthesis in the inner membrane. Loss of TRIAP1 or PRELI impairs the accumulation of CL, facilitates the release of cytochrome c, and renders cells vulnerable to apoptosis upon intrinsic and extrinsic stimulation. Survival of TRIAP1- and PRELI-deficient cells is conferred by an excess of exogenously provided phosphatidylglycerol. Our results reveal a p53-dependent cell-survival pathway and highlight the importance of the CL content of mitochondrial membranes in apoptosis.
Collapse
Affiliation(s)
- Christoph Potting
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, Center for Molecular Medicine, University of Cologne, Germany
| | | | | | | | | | | | | |
Collapse
|
25
|
Botelho SC, Tatsuta T, von Heijne G, Kim H. Dislocation by the m-AAA protease increases the threshold hydrophobicity for retention of transmembrane helices in the inner membrane of yeast mitochondria. J Biol Chem 2013; 288:4792-8. [PMID: 23283966 DOI: 10.1074/jbc.m112.430892] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Sorting of mitochondrial inner membrane proteins is a complex process in which translocons and proteases function in a concerted way. Many inner membrane proteins insert into the membrane via the TIM23 translocon, and some are then further acted upon by the mitochondrial m-AAA protease, a molecular motor capable of dislocating proteins from the inner membrane. This raises the possibility that the threshold hydrophobicity for the retention of transmembrane segments in the inner membrane is different depending on whether they belong to membrane proteins that are m-AAA protease substrates or not. Here, using model transmembrane segments engineered into m-AAA protease-dependent proteins, we show that the threshold hydrophobicity for membrane retention measured in yeast cells in the absence of a functional m-AAA protease is markedly lower than that measured in its presence. Whether a given hydrophobic segment in a mitochondrial inner membrane protein will ultimately form a transmembrane helix may therefore depend on whether or not it will be exposed to the pulling force exerted by the m-AAA protease during biogenesis.
Collapse
Affiliation(s)
- Salomé Calado Botelho
- Center for Biomembrane Research, Department of Biochemistry and Biophysics, Stockholm University, SE-106 91 Stockholm, Sweden
| | | | | | | |
Collapse
|
26
|
Abstract
Lipids are the building blocks of cellular membranes and are synthesized at distinct parts of the cell. A precise control of lipid synthesis and distribution is crucial for cell function and survival. The endoplasmic reticulum (ER) is the major lipid-synthesizing organelle. However, a subset of lipids is synthesized within mitochondria, and this aspect has become a focus of recent lipid research. Mitochondria form a dynamic membrane network that is reshaped by fusion and fission events. Their functionality therefore depends on a continuous lipid supply from the ER and the distribution of lipids between both mitochondrial membranes. The mechanisms of mitochondrial lipid trafficking are only now emerging and appear to involve membrane contact sites and lipid transfer proteins. In this Cell Science at a Glance article, we will discuss recent discoveries in the field of mitochondrial lipid trafficking that build on long-standing observations and shed new light on the shuttling of membrane lipids between mitochondria and other organelles.
Collapse
|
27
|
Connerth M, Tatsuta T, Haag M, Klecker T, Westermann B, Langer T. Intramitochondrial Transport of Phosphatidic Acid in Yeast by a Lipid Transfer Protein. Science 2012; 338:815-8. [DOI: 10.1126/science.1225625] [Citation(s) in RCA: 186] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
28
|
Hornig-Do HT, Tatsuta T, Buckermann A, Bust M, Kollberg G, Rötig A, Hellmich M, Nijtmans L, Wiesner RJ. Nonsense mutations in the COX1 subunit impair the stability of respiratory chain complexes rather than their assembly. EMBO J 2012; 31:1293-307. [PMID: 22252130 PMCID: PMC3297988 DOI: 10.1038/emboj.2011.477] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Accepted: 12/01/2011] [Indexed: 01/22/2023] Open
Abstract
Respiratory chain (RC) complexes are organized into supercomplexes forming 'respirasomes'. The mechanism underlying the interdependence of individual complexes is still unclear. Here, we show in human patient cells that the presence of a truncated COX1 subunit leads to destabilization of complex IV (CIV) and other RC complexes. Surprisingly, the truncated COX1 protein is integrated into subcomplexes, the holocomplex and even into supercomplexes, which however are all unstable. Depletion of the m-AAA protease AFG3L2 increases stability of the truncated COX1 and other mitochondrially encoded proteins, whereas overexpression of wild-type AFG3L2 decreases their stability. Both full-length and truncated COX1 proteins physically interact with AFG3L2. Expression of a dominant negative AFG3L2 variant also promotes stabilization of CIV proteins as well as the assembled complex and rescues the severe phenotype in heteroplasmic cells. Our data indicate that the mechanism underlying pathogenesis in these patients is the rapid clearance of unstable respiratory complexes by quality control pathways, rather than their impaired assembly.
Collapse
Affiliation(s)
- Hue-Tran Hornig-Do
- Institute for Vegetative Physiology, University of Cologne, Cologne, Germany
| | - Takashi Tatsuta
- Institute for Genetics, University of Cologne, Cologne, Germany
| | - Angela Buckermann
- Institute for Vegetative Physiology, University of Cologne, Cologne, Germany
| | - Maria Bust
- Institute for Vegetative Physiology, University of Cologne, Cologne, Germany
| | - Gittan Kollberg
- Department of Clinical Chemistry, Sahlgrenska University Hospital, Göteborg, Sweden
| | - Agnes Rötig
- INSERM U781, Hôpital Necker-Enfants Malades, Université René Descartes, Paris, France
| | - Martin Hellmich
- Institute of Medical Statistics, Informatics and Epidemiology, Cologne, Germany
| | - Leo Nijtmans
- Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | - Rudolf J Wiesner
- Institute for Vegetative Physiology, University of Cologne, Cologne, Germany
- Center for Molecular Medicine Cologne, CMMC, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany
| |
Collapse
|
29
|
Gerdes F, Tatsuta T, Langer T. Mitochondrial AAA proteases--towards a molecular understanding of membrane-bound proteolytic machines. Biochim Biophys Acta 2011; 1823:49-55. [PMID: 22001671 DOI: 10.1016/j.bbamcr.2011.09.015] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 09/13/2011] [Accepted: 09/15/2011] [Indexed: 10/16/2022]
Abstract
Mitochondrial AAA proteases play an important role in the maintenance of mitochondrial proteostasis. They regulate and promote biogenesis of mitochondrial proteins by acting as processing enzymes and ensuring the selective turnover of misfolded proteins. Impairment of AAA proteases causes pleiotropic defects in various organisms including neurodegeneration in humans. AAA proteases comprise ring-like hexameric complexes in the mitochondrial inner membrane and are functionally conserved from yeast to man, but variations are evident in the subunit composition of orthologous enzymes. Recent structural and biochemical studies revealed how AAA proteases degrade their substrates in an ATP dependent manner. Intersubunit coordination of the ATP hydrolysis leads to an ordered ATP hydrolysis within the AAA ring, which ensures efficient substrate dislocation from the membrane and translocation to the proteolytic chamber. In this review, we summarize recent findings on the molecular mechanisms underlying the versatile functions of mitochondrial AAA proteases and their relevance to those of the other AAA+ machines.
Collapse
Affiliation(s)
- Florian Gerdes
- Institute for Genetics, Centre for Molecular Medicine (CMMC), Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Zülpicher Str. 47a, 50674 Cologne, Germany.
| | | | | |
Collapse
|
30
|
Abstract
A decline in mitochondrial activity has been associated with aging and is a hallmark of many neurological diseases. Surveillance mechanisms acting at the molecular, organellar, and cellular level monitor mitochondrial integrity and ensure the maintenance of mitochondrial proteostasis. Here we will review the central role of mitochondrial chaperones and proteases, the cytosolic ubiquitin-proteasome system, and the mitochondrial unfolded response in this interconnected quality control network, highlighting the dual function of some proteases in protein quality control within the organelle and for the regulation of mitochondrial fusion and mitophagy.
Collapse
Affiliation(s)
- Michael J Baker
- Institute for Genetics, Center for Molecular Medicine (CMMC), Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50674 Cologne, Germany
| | | | | |
Collapse
|
31
|
Murawala P, Sawai N, Tatsuta T, Tsuji O, Fujita S, Fujita S. On the Interface Properties and Deep Level Defects in Ta2O5 Grown on Si by Plasma Enhanced Liquid Source-Cvd. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-309-15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractWe report, for the first time, on interface properties of the Ta2O5-Si system and on the deep level defects in Ta2O5 grown by plasma enhanced liquid source chemical vapor deposition (PE-LS-CVD) using Ta(OC2Hs)5. The capacitance voltage (C–V) measurement performed on Au/Ta2O5/n, p-Si MOS diodes resulted in very well defined C-V charactristics which compares well with the ideal C-V curve. The flat band voltage is as low as 0.15 V and the minimum density of the interface state is about 2.7 × 1011 cm−2 ev−1. In order to examine deep level defects in Ta2O5, we investigated variations of flat band voltage under application of high stress electric field (10MV/cm), by which hot carriers are injected in to deep levels. This charge transfer process results in increase of charges in Ta2O5 oxide which is attributed to the equivalent deep level defect densities, which is found to be of the order of 2 × 1011 cm−2 in the Ta2O5-Si system. These results strongly suggest low interface states and deep levels in the PE-LS-CVD grown Ta2O5-Si system, which may be brought about by low decomposed-carbon impurities in the film, confirmed by AES in our previous reports. These films can play a vital role as thin capacitors in I.C. technology.
Collapse
|
32
|
Lee S, Augustin S, Tatsuta T, Gerdes F, Langer T, Tsai FT. Three-Dimensional Structure of a Membrane-Anchored AAA Machine. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.2270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
|
33
|
Lee S, Augustin S, Tatsuta T, Gerdes F, Langer T, Tsai FTF. Electron cryomicroscopy structure of a membrane-anchored mitochondrial AAA protease. J Biol Chem 2010; 286:4404-11. [PMID: 21147776 DOI: 10.1074/jbc.m110.158741] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FtsH-related AAA proteases are conserved membrane-anchored, ATP-dependent molecular machines, which mediate the processing and turnover of soluble and membrane-embedded proteins in eubacteria, mitochondria, and chloroplasts. Homo- and hetero-oligomeric proteolytic complexes exist, which are composed of homologous subunits harboring an ATPase domain of the AAA family and an H41 metallopeptidase domain. Mutations in subunits of mitochondrial m-AAA proteases have been associated with different neurodegenerative disorders in human, raising questions on the functional differences between homo- and hetero-oligomeric AAA proteases. Here, we have analyzed the hetero-oligomeric yeast m-AAA protease composed of homologous Yta10 and Yta12 subunits. We combined genetic and structural approaches to define the molecular determinants for oligomer assembly and to assess functional similarities between Yta10 and Yta12. We demonstrate that replacement of only two amino acid residues within the metallopeptidase domain of Yta12 allows its assembly into homo-oligomeric complexes. To provide a molecular explanation, we determined the 12 Å resolution structure of the intact yeast m-AAA protease with its transmembrane domains by electron cryomicroscopy (cryo-EM) and atomic structure fitting. The full-length m-AAA protease has a bipartite structure and is a hexamer in solution. We found that residues in Yta12, which facilitate homo-oligomerization when mutated, are located at the interface between neighboring protomers in the hexamer ring. Notably, the transmembrane and intermembrane space domains are separated from the main body, creating a passage on the matrix side, which is wide enough to accommodate unfolded but not folded polypeptides. These results suggest a mechanism regarding how proteins are recognized and degraded by m-AAA proteases.
Collapse
Affiliation(s)
- Sukyeong Lee
- Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA
| | | | | | | | | | | |
Collapse
|
34
|
Augustin S, Gerdes F, Lee S, Tsai FTF, Langer T, Tatsuta T. An intersubunit signaling network coordinates ATP hydrolysis by m-AAA proteases. Mol Cell 2009; 35:574-85. [PMID: 19748354 DOI: 10.1016/j.molcel.2009.07.018] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 05/08/2009] [Accepted: 07/10/2009] [Indexed: 11/17/2022]
Abstract
Ring-shaped AAA+ ATPases control a variety of cellular processes by substrate unfolding and remodeling of macromolecular structures. However, how ATP hydrolysis within AAA+ rings is regulated and coupled to mechanical work is poorly understood. Here we demonstrate coordinated ATP hydrolysis within m-AAA protease ring complexes, conserved AAA+ machines in the inner membrane of mitochondria. ATP binding to one AAA subunit inhibits ATP hydrolysis by the neighboring subunit, leading to coordinated rather than stochastic ATP hydrolysis within the AAA ring. Unbiased genetic screens define an intersubunit signaling pathway involving conserved AAA motifs and reveal an intimate coupling of ATPase activities to central AAA pore loops. Coordinated ATP hydrolysis between adjacent subunits is required for membrane dislocation of substrates, but not for substrate processing. These findings provide insight into how AAA+ proteins convert energy derived from ATP hydrolysis into mechanical work.
Collapse
Affiliation(s)
- Steffen Augustin
- Institute for Genetics, Center for Molecular Medicine Cologne, University of Cologne, Germany
| | | | | | | | | | | |
Collapse
|
35
|
Abstract
Mitochondria are crucial for both life and death of eukaryotic cells. Compromised mitochondrial integrity has severe cellular consequences and is linked to senescence and neurodegenerative disorders in humans. To maintain the functionality of proteins in mitochondria, quality-control mechanisms including signal transduction pathways counteracting mitochondrial stress have evolved. A network of molecular chaperones and proteases monitors protein integrity and prevents accumulation of damaged proteins. In this review, the current knowledge of elaborate defence strategies within mitochondria is summarized.
Collapse
Affiliation(s)
- Takashi Tatsuta
- Institute for Genetics, University of Cologne, Cologne, Germany.
| |
Collapse
|
36
|
Merkwirth C, Dargazanli S, Tatsuta T, Geimer S, Löwer B, Wunderlich FT, von Kleist-Retzow JC, Waisman A, Westermann B, Langer T. Prohibitins control cell proliferation and apoptosis by regulating OPA1-dependent cristae morphogenesis in mitochondria. Genes Dev 2008; 22:476-88. [PMID: 18281461 DOI: 10.1101/gad.460708] [Citation(s) in RCA: 410] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Prohibitins comprise an evolutionarily conserved and ubiquitously expressed family of membrane proteins with poorly described functions. Large assemblies of PHB1 and PHB2 subunits are localized in the inner membrane of mitochondria, but various roles in other cellular compartments have also been proposed for both proteins. Here, we used conditional gene targeting of murine Phb2 to define cellular activities of prohibitins. Our experiments restrict the function of prohibitins to mitochondria and identify the processing of the dynamin-like GTPase OPA1, an essential component of the mitochondrial fusion machinery, as the central cellular process controlled by prohibitins. Deletion of Phb2 leads to the selective loss of long isoforms of OPA1. This results in an aberrant cristae morphogenesis and an impaired cellular proliferation and resistance toward apoptosis. Expression of a long OPA1 isoform in PHB2-deficient cells suppresses these defects, identifying impaired OPA1 processing as the primary cellular defect in the absence of prohibitins. Our results therefore assign an essential function for the formation of mitochondrial cristae to prohibitins and suggest a coupling of cell proliferation to mitochondrial morphogenesis.
Collapse
Affiliation(s)
- Carsten Merkwirth
- Institute for Genetics, Centre for Molecular Medicine, University of Cologne, 50674 Cologne, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Tatsuta T, Langer T. Quality control of mitochondria: protection against neurodegeneration and ageing. EMBO J 2008; 27:306-14. [PMID: 18216873 DOI: 10.1038/sj.emboj.7601972] [Citation(s) in RCA: 405] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Accepted: 12/04/2007] [Indexed: 01/30/2023] Open
Abstract
Dysfunction of mitochondria has severe cellular consequences and is linked to ageing and neurodegeneration in human. Several surveillance strategies have evolved that limit mitochondrial damage and ensure cellular integrity. Intraorganellar proteases conduct protein quality control and exert regulatory functions, membrane fusion and fission allow mitochondrial content mixing within a cell, and the autophagic degradation of severely damaged mitochondria protects against apoptosis. Here, we will summarize the current knowledge on these surveillance strategies and their role in human disease.
Collapse
Affiliation(s)
- Takashi Tatsuta
- Institute for Genetics and Centre for Molecular Medicine, University of Cologne, Cologne, Germany
| | | |
Collapse
|
38
|
Kitanaka J, Kitanaka N, Tatsuta T, Morita Y, Takemura M. Blockade of brain histamine metabolism alters methamphetamine-induced expression pattern of stereotypy in mice via histamine H1 receptors. Neuroscience 2007; 147:765-77. [PMID: 17570600 DOI: 10.1016/j.neuroscience.2007.05.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 04/16/2007] [Accepted: 05/07/2007] [Indexed: 11/23/2022]
Abstract
The administration of methamphetamine (METH, 10 mg/kg, i.p.) to male ICR mice induced stereotyped behavior consisting of nail and/or wood chip biting (86.0%), continuous sniffing (12.0%), head bobbing (1.1%), and circling (1.0%) during the observation period of 1 h. Pretreatment of the mice with metoprine (2, 10, and 20 mg/kg, i.p.), a selective inhibitor of histamine N-methyltransferase (HMT), which metabolizes histamine in the brain, significantly increased and decreased METH-induced continuous sniffing (20.5, 51.3, and 80.3%) and nail and/or wood chip biting (77.4, 45.3, and 14.2%), respectively, in a dose-dependent manner. The hypothalamic contents of histamine and its metabolite N(tau)-methylhistamine were significantly increased and decreased by metoprine (10 mg/kg, i.p.), respectively. The metoprine action on METH-induced behavior was completely abolished by pyrilamine (10 and 20 mg/kg) and ketotifen (10 mg/kg), selective, centrally acting histamine H(1) receptor antagonists, but not by fexofenadine (20 mg/kg), zolantidine (10 mg/kg) and thioperamide (10 mg/kg), a peripherally acting histamine H(1) receptor antagonist and a selective, brain-penetrating antagonist for histamine H(2) and H(3) receptors, respectively. The metoprine action was mimicked by SKF 91488 (100 microg/animal, i.c.v.), another HMT inhibitor, and the action of SKF 91488 was also blocked by pyrilamine. The frequency of the expression of METH-induced total stereotypic patterns was unchanged after metoprine pretreatment. Mice pretreated with metoprine displayed no anxiety-like behavior in the elevated plus maze test. These results suggest that brain histamine, increased by agents such as metoprine and SKF 91488, binds to histamine H(1) receptors in the brain, resulting in the modulation of dopaminergic transmission associated with stereotyped behavioral patterns induced by METH.
Collapse
Affiliation(s)
- J Kitanaka
- Department of Pharmacology, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.
| | | | | | | | | |
Collapse
|
39
|
Saeki N, Kim DH, Usui T, Aoyagi K, Tatsuta T, Aoki K, Yanagihara K, Tamura M, Mizushima H, Sakamoto H, Ogawa K, Ohki M, Shiroishi T, Yoshida T, Sasaki H. GASDERMIN, suppressed frequently in gastric cancer, is a target of LMO1 in TGF-β-dependent apoptotic signalling. Oncogene 2007; 26:6488-98. [PMID: 17471240 DOI: 10.1038/sj.onc.1210475] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Defining apoptosis-regulatory cascades of the epithelium is important for understanding carcinogenesis, since cancer cells are considered to arise as a result of the collapse of the cascades. We previously reported that a novel gene GASDERMIN (GSDM) is expressed in the stomach but suppressed in gastric cancer cell lines. Furthermore, in this study, we demonstrated that GSDM is expressed in the mucus-secreting pit cells of the gastric epithelium and frequently silenced in primary gastric cancers. We found that GSDM has a highly apoptotic activity and its expression is regulated by a transcription factor LIM domain only 1 (LMO1) through a sequence to which Runt-related transcription factor 3 (RUNX3) binds, in a GSDM promoter region. We observed coexpression of GSDM with LMO1, RUNX3 and type II transforming growth factor-beta receptor (TGF-betaRII) in the pit cells, and found that TGF-beta upregulates the LMO1- and GSDM-expression in the gastric epithelial cell line and induces apoptosis, which was confirmed by the finding that the apoptosis induction is inhibited by suppression of each LMO1-, RUNX3- and GSDM expression, respectively. The present data suggest that TGF-beta, LMO1, possibly RUNX3, and GSDM form a regulatory pathway for directing the pit cells to apoptosis.
Collapse
Affiliation(s)
- N Saeki
- Center for Medical Genomics, Genetics Division, National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Tatsuta T, Augustin S, Nolden M, Friedrichs B, Langer T. m-AAA protease-driven membrane dislocation allows intramembrane cleavage by rhomboid in mitochondria. EMBO J 2007; 26:325-35. [PMID: 17245427 PMCID: PMC1783466 DOI: 10.1038/sj.emboj.7601514] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Accepted: 11/23/2006] [Indexed: 11/09/2022] Open
Abstract
Maturation of cytochrome c peroxidase (Ccp1) in mitochondria occurs by the subsequent action of two conserved proteases in the inner membrane: the m-AAA protease, an ATP-dependent protease degrading misfolded proteins and mediating protein processing, and the rhomboid protease Pcp1, an intramembrane cleaving peptidase. Neither the determinants preventing complete proteolysis of certain substrates by the m-AAA protease, nor the obligatory requirement of the m-AAA protease for rhomboid cleavage is currently understood. Here, we describe an intimate and unexpected functional interplay of both proteases. The m-AAA protease mediates the ATP-dependent membrane dislocation of Ccp1 independent of its proteolytic activity. It thereby ensures the correct positioning of Ccp1 within the membrane bilayer allowing intramembrane cleavage by rhomboid. Decreasing the hydrophobicity of the Ccp1 transmembrane segment facilitates its dislocation from the membrane and renders rhomboid cleavage m-AAA protease-independent. These findings reveal for the first time a non-proteolytic function of the m-AAA protease during mitochondrial biogenesis and rationalise the requirement of a preceding step for intramembrane cleavage by rhomboid.
Collapse
Affiliation(s)
- Takashi Tatsuta
- Institute for Genetics and Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Steffen Augustin
- Institute for Genetics and Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Mark Nolden
- Institute for Genetics and Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Björn Friedrichs
- Institute for Genetics and Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Thomas Langer
- Institute for Genetics and Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
- Institut für Genetik, Universität zu Köln, Zülpicher Strasse 47, 50674 Köln, Germany. Tel.: +49 221 470 4876; Fax: +49 221 470 6749; E-mail:
| |
Collapse
|
41
|
Abstract
Mitochondria are dynamic organelles with activities that adjust to altering physiological conditions and variable metabolic demands. A conserved proteolytic system present within the organelle exerts essential functions during the biogenesis of mitochondria and ensures the maintenance of organellar activities under varying conditions. Proteases dependent on adenosine triphosphate, in concert with oligopeptidases, degrade nonassembled or damaged proteins in various subcompartments of mitochondria, preventing their accumulation and possibly deleterious effects on mitochondrial functions. Although an increasing number of mitochondrial peptidases are characterized and functionally linked to diverse cellular processes, only limited information is available on the stability of the mitochondrial proteome and the turnover rates of individual proteins. We describe experimental approaches in the yeast Saccharomyces cerevisiae and in mice, allowing analysis of the proteolytic breakdown of mitochondrial proteins individually or on a proteomewide scale.
Collapse
|
42
|
Osman C, Wilmes C, Tatsuta T, Langer T. Prohibitins interact genetically with Atp23, a novel processing peptidase and chaperone for the F1Fo-ATP synthase. Mol Biol Cell 2006; 18:627-35. [PMID: 17135288 PMCID: PMC1783772 DOI: 10.1091/mbc.e06-09-0839] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The generation of cellular energy depends on the coordinated assembly of nuclear and mitochondrial-encoded proteins into multisubunit respiratory chain complexes in the inner membrane of mitochondria. Here, we describe the identification of a conserved metallopeptidase present in the intermembrane space, termed Atp23, which exerts dual activities during the biogenesis of the F(1)F(O)-ATP synthase. On one hand, Atp23 serves as a processing peptidase and mediates the maturation of the mitochondrial-encoded F(O)-subunit Atp6 after its insertion into the inner membrane. On the other hand and independent of its proteolytic activity, Atp23 promotes the association of mature Atp6 with Atp9 oligomers. This assembly step is thus under the control of two substrate-specific chaperones, Atp10 and Atp23, which act on opposite sides of the inner membrane. Strikingly, both ATP10 and ATP23 were found to genetically interact with prohibitins, which build up large, ring-like assemblies with a proposed scaffolding function in the inner membrane. Our results therefore characterize not only a novel processing peptidase with chaperone activity in the mitochondrial intermembrane space but also link the function of prohibitins to the F(1)F(O)-ATP synthase complex.
Collapse
Affiliation(s)
- Christof Osman
- Institute for Genetics and Center for Molecular Medicine, University of Cologne, D-50674 Cologne, Germany
| | - Claudia Wilmes
- Institute for Genetics and Center for Molecular Medicine, University of Cologne, D-50674 Cologne, Germany
| | - Takashi Tatsuta
- Institute for Genetics and Center for Molecular Medicine, University of Cologne, D-50674 Cologne, Germany
| | - Thomas Langer
- Institute for Genetics and Center for Molecular Medicine, University of Cologne, D-50674 Cologne, Germany
| |
Collapse
|
43
|
Kambacheld M, Augustin S, Tatsuta T, Müller S, Langer T. Role of the novel metallopeptidase Mop112 and saccharolysin for the complete degradation of proteins residing in different subcompartments of mitochondria. J Biol Chem 2005; 280:20132-9. [PMID: 15772085 DOI: 10.1074/jbc.m500398200] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mitochondria harbor a conserved proteolytic system that mediates the complete degradation of organellar proteins. ATP-dependent proteases, like a Lon protease in the matrix space and m- and i-AAA proteases in the inner membrane, degrade malfolded proteins within mitochondria and thereby protect the cell against mitochondrial damage. Proteolytic breakdown products include peptides and free amino acids, which are constantly released from mitochondria. It remained unclear, however, whether the turnover of malfolded proteins involves only ATP-dependent proteases or also oligopeptidases within mitochondria. Here we describe the identification of Mop112, a novel metallopeptidase of the pitrilysin family M16 localized in the intermembrane space of yeast mitochondria. This peptidase exerts important functions for the maintenance of the respiratory competence of the cells that overlap with the i-AAA protease. Deletion of MOP112 did not affect the stability of misfolded proteins in mitochondria, but resulted in an increased release from the organelle of peptides, generated upon proteolysis of mitochondrial proteins. We find that the previously described metallopeptidase saccharolysin (or Prd1) exerts a similar function in the intermembrane space. The identification of peptides released from peptidase-deficient mitochondria by mass spectrometry indicates a dual function of Mop112 and saccharolysin: they degrade peptides generated upon proteolysis of proteins both in the intermembrane and matrix space and presequence peptides cleaved off by specific processing peptidases in both compartments. These results suggest that the turnover of mitochondrial proteins is mediated by the sequential action of ATP-dependent proteases and oligopeptidases, some of them localized in the intermembrane space.
Collapse
Affiliation(s)
- Melanie Kambacheld
- Institut für Genetik and Zentrum für Molekulare Medizin (ZMMK), Universität zu Köln, Germany
| | | | | | | | | |
Collapse
|
44
|
Abstract
Prohibitins comprise a remarkably conserved protein family in eukaryotic cells with proposed functions in cell cycle progression, senescence, apoptosis, and the regulation of mitochondrial activities. Two prohibitin homologues, Phb1 and Phb2, assemble into a high molecular weight complex of approximately 1.2 MDa in the mitochondrial inner membrane, but a nuclear localization of Phb1 and Phb2 also has been reported. Here, we have analyzed the biogenesis and structure of the prohibitin complex in Saccharomyces cerevisiae. Both Phb1 and Phb2 subunits are targeted to mitochondria by unconventional noncleavable targeting sequences at their amino terminal end. Membrane insertion involves binding of newly imported Phb1 to Tim8/13 complexes in the intermembrane space and is mediated by the TIM23-translocase. Assembly occurs via intermediate-sized complexes of approximately 120 kDa containing both Phb1 and Phb2. Conserved carboxy-terminal coiled-coil regions in both subunits mediate the formation of large assemblies in the inner membrane. Single particle electron microscopy of purified prohibitin complexes identifies diverse ring-shaped structures with outer dimensions of approximately 270 x 200 angstroms. Implications of these findings for proposed cellular activities of prohibitins are discussed.
Collapse
Affiliation(s)
- Takashi Tatsuta
- Institut für Genetik and Zentrum für Molekulare Medizin, Universität zu Köln, 50674 Köln, Germany
| | | | | |
Collapse
|
45
|
Hirahara K, Tatsuta T, Takatori T, Ohtsuki M, Kirinaka H, Kawaguchi J, Serizawa N, Taniguchi Y, Saito S, Sakaguchi M, Inouye S, Shiraishi A. Preclinical evaluation of an immunotherapeutic peptide comprising 7 T-cell determinants of Cry j 1 and Cry j 2, the major Japanese cedar pollen allergens. J Allergy Clin Immunol 2001; 108:94-100. [PMID: 11447388 DOI: 10.1067/mai.2001.115481] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Peptide immunotherapy is a new approach to treating allergic diseases, but a therapeutic peptide for Japanese cedar pollinosis has not yet been developed. OBJECTIVE The aim of this study is to prepare and preclinically evaluate a hybrid peptide comprising 7 T-cell determinants of Cry j 1 and Cry j 2, the major Japanese cedar pollen allergens. METHODS The recombinant hybrid peptide was prepared after immunodominance of 7 T-cell determinants was confirmed by means of PBMC proliferation assay in 113 volunteers with pollinosis. The hybrid peptide was compared with a mixture of the 7 T-cell determinants in a dose-dependent PBMC proliferation assay in 6 volunteers with pollinosis. PBMC proliferation and binding activity of serum IgE antibody against the hybrid peptide, Cry j 1, and Cry j 2 were investigated in 48 volunteers with pollinosis. RESULTS The hybrid peptide induced T-cell proliferation with an average 100-fold lower concentration than a mixture of the 7 peptides. PBMCs from 44 (92%) of 48 volunteers proliferated against the hybrid peptide, with significant correlation (r = 0.87) in T-cell proliferation against Cry j 1 and Cry j 2. No serum IgE antibodies specific to Cry j 1 or Cry j 2 bound to the hybrid peptide. CONCLUSION A hybrid peptide comprising 7 T-cell determinants has the potential for inducing T-cell proliferative responses that is superior to the potential of a mixture of the T-cell determinants and comparable with that of Cry j 1 and Cry j 2. The hybrid peptide will be of use in specific immunotherapy against Japanese cedar pollinosis.
Collapse
Affiliation(s)
- K Hirahara
- Sankyo Co, Ltd, Tokyo; Hayashibara Biochemical Laboratories, Inc, Okayama, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Abstract
ATP-binding cassette (ABC) adenosine triphosphatases actively transport a wide variety of compounds across biological membranes. Here, the ABC protein Mdl1 was identified as an intracellular peptide transporter localized in the inner membrane of yeast mitochondria. Mdl1 was required for mitochondrial export of peptides with molecular masses of approximately 2100 to 600 daltons generated by proteolysis of inner-membrane proteins by the m-AAA protease in the mitochondrial matrix. Proteolysis by the i-AAA protease in the intermembrane space led to the release of similar-sized peptides independent of Mdl1. Thus, two pathways of peptide efflux from mitochondria exist that may allow communication between mitochondria and their cellular environment.
Collapse
Affiliation(s)
- L Young
- Division of Immunology, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
| | | | | | | | | |
Collapse
|
47
|
Abstract
Under non-stressed conditions in Escherichia coli, the heat shock transcription factor sigma(32) is rapidly degraded by the AAA protease FtsH. The DnaK chaperone system is also required for the rapid turnover of sigma(32) in the cell. It has been hypothesized that the DnaK chaperone system facilitates the degradation of sigma(32) by sequestering it from RNA polymerase core. This hypothesis predicts that mutant sigma(32) proteins, which are deficient in binding to RNA polymerase core, will be degraded independently of the DnaK chaperone system. We examined the in vivo stability of such mutant sigma(32) proteins. Results indicated that the mutant sigma(32) proteins as similar as authentic sigma(32) were stabilized in DeltadnaK and DeltadnaJ/DeltacbpA cells. The interaction between sigma(32) and DnaK/DnaJ/GrpE was not affected by these mutations. These results strongly suggest that the degradation of sigma(32) requires an unidentified active role of the DnaK chaperone system.
Collapse
Affiliation(s)
- T Tatsuta
- Division of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Japan
| | | | | | | | | |
Collapse
|
48
|
Abstract
Caspase-1 (interleukin-1beta converting enzyme) is produced in the form of a latent precursor, which is cleaved to yield a prodomain in addition to the p20 and p10 subunits. It has been established that the (p20/p10)(2) heterotetramer processes the latent precursor of interleukin-1beta into an active form during apoptosis, but the function of the residual prodomain of caspase-1 (Pro-C1) has not been established. To evaluate the involvement of Pro-C1 in apoptosis, a Pro-C1 expression vector was transfected into the HeLa cell line, which is susceptible to Fas-mediated apoptosis. Expression of recombinant Pro-C1 in HeLa cells enhanced apoptosis mediated by Fas, but not etoposide-induced apoptosis. This enhancement of Fas-mediated apoptosis was abolished by inhibitors of caspase-8 (Ile-Glu-Thr-Asp-fluoromethyl ketone) and caspase-3 (Asp-Glu-Val-Asp-aldehyde) but was only slightly diminished by an inhibitor of caspase-1 (acetyl-Tyr-Val-Ala-Asp-chloromethyl ketone). During apoptosis induced by an agonistic anti-Fas antibody, the activation of caspase-8 and caspase-3 was more pronounced and occurred more rapidly in HeLa/Pro-C1 cells than in the empty vector transfectant (HeLa/vec) cells; in contrast, caspase-1 was not activated in either HeLa/Pro-C1 or HeLa/vec cells. These results demonstrate an additional and novel function for caspase-1 in which Pro-C1 acts to enhance Fas-mediated apoptosis, most probably through facilitation of the activation of caspase-8.
Collapse
Affiliation(s)
- T Tatsuta
- Neuroscience and Immunology Research Laboratories, Sankyo Co., Ltd., 1-2-58, Hiromachi, Shinagawa, Tokyo 140-8710, Japan.
| | | | | |
Collapse
|
49
|
Shiomi H, Hase T, Matsuno S, Izumi M, Tatsuta T, Ito F, Kishida A, Tani T, Kodama M. Handlebar hernia with intra-abdominal extraluminal air presenting as a novel form of traumatic abdominal wall hernia: report of a case. Surg Today 2000; 29:1280-4. [PMID: 10639713 DOI: 10.1007/bf02482224] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
An 18-year-old male was admitted to our Emergency Department with a traumatic abdominal wall hernia (TAWH) of the left lower quadrant (LLQ) after suffering hypogastric blunt injury and urogenital lacerations in a motorcycle accident. Upright chest X-ray showed a small amount of right infradiaphragmatic free air, and a computed tomographic (CT) scan demonstrated an abdominal wall hernia. At surgery, no impairment was found in the digestive tract, and an abdominal herniorrhaphy was performed. It is suggested that the free air had passed through a connection between the scrotal laceration and the contralateral abdominal defect via the subcutaneous space and was palpated as emphysema. This is a new type of TAWH, which suggests that blunt abdominal trauma may result in negative pressure in the subcutaneous and peritoneal cavity, and this could reflect the pathophysiology of TAWH.
Collapse
Affiliation(s)
- H Shiomi
- First Department of Surgery, Shiga University of Medical Science, Otsu, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Makino SI, Makino T, Abe K, Hashimoto J, Tatsuta T, Kitagawa M, Mori H, Ogura T, Fujii T, Fushinobu S, Wakagi T, Matsuzawa H. Erratum to: Second transmembrane segment of FtsH plays a role in its proteolytic activity and homo-oligomerization (FEBS 22846). FEBS Lett 2000. [DOI: 10.1016/s0014-5793(00)01158-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|