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Kummer E, Ban N. Structural insights into mammalian mitochondrial translation elongation catalyzed by mtEFG1. EMBO J 2020; 39:e104820. [PMID: 32602580 PMCID: PMC7396830 DOI: 10.15252/embj.2020104820] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [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: 02/25/2020] [Revised: 05/08/2020] [Accepted: 05/11/2020] [Indexed: 01/08/2023] Open
Abstract
Mitochondria are eukaryotic organelles of bacterial origin where respiration takes place to produce cellular chemical energy. These reactions are catalyzed by the respiratory chain complexes located in the inner mitochondrial membrane. Notably, key components of the respiratory chain complexes are encoded on the mitochondrial chromosome and their expression relies on a dedicated mitochondrial translation machinery. Defects in the mitochondrial gene expression machinery lead to a variety of diseases in humans mostly affecting tissues with high energy demand such as the nervous system, the heart, or the muscles. The mitochondrial translation system has substantially diverged from its bacterial ancestor, including alterations in the mitoribosomal architecture, multiple changes to the set of translation factors and striking reductions in otherwise conserved tRNA elements. Although a number of structures of mitochondrial ribosomes from different species have been determined, our mechanistic understanding of the mitochondrial translation cycle remains largely unexplored. Here, we present two cryo-EM reconstructions of human mitochondrial elongation factor G1 bound to the mammalian mitochondrial ribosome at two different steps of the tRNA translocation reaction during translation elongation. Our structures explain the mechanism of tRNA and mRNA translocation on the mitoribosome, the regulation of mtEFG1 activity by the ribosomal GTPase-associated center, and the basis of decreased susceptibility of mtEFG1 to the commonly used antibiotic fusidic acid.
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Affiliation(s)
- Eva Kummer
- Department of BiologyInstitute of Molecular Biology and BiophysicsSwiss Federal Institute of Technology ZurichZurichSwitzerland
| | - Nenad Ban
- Department of BiologyInstitute of Molecular Biology and BiophysicsSwiss Federal Institute of Technology ZurichZurichSwitzerland
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Brito S, Thompson K, Campistol J, Colomer J, Hardy SA, He L, Fernández-Marmiesse A, Palacios L, Jou C, Jiménez-Mallebrera C, Armstrong J, Montero R, Artuch R, Tischner C, Wenz T, McFarland R, Taylor RW. Corrigendum: Long-term survival in a child with severe encephalopathy, multiple respiratory chain deficiency and GFM1 mutations. Front Genet 2015; 6:254. [PMID: 26284110 PMCID: PMC4516972 DOI: 10.3389/fgene.2015.00254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 07/13/2015] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article on p. 102 in vol. 6, PMID: 25852744.].
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Affiliation(s)
- Sara Brito
- Serviço de Pediatria, Centro Hospitalar de Leiria, Hospital de Santo AndréLeiria, Portugal
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
| | - Kyle Thompson
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Jaume Campistol
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
| | - Jaime Colomer
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
| | - Steven A. Hardy
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Langping He
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Ana Fernández-Marmiesse
- Diagnosis and Treatment Unit for Inborn Errors of Metabolism, Hospital Clínico Universitario de Santiago de CompostelaLa Coruña, Spain
| | | | - Cristina Jou
- Pathology Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Cecilia Jiménez-Mallebrera
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
| | - Judith Armstrong
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical, Genetics and Rett Unit, Laboratory Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Raquel Montero
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Rafael Artuch
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Christin Tischner
- Cluster of Excellence, Cellular Stress Responses in Aging-Associated Diseases, Institute for Genetics, University of CologneCologne, Germany
| | - Tina Wenz
- Cluster of Excellence, Cellular Stress Responses in Aging-Associated Diseases, Institute for Genetics, University of CologneCologne, Germany
- German Network for Mitochondrial DisordersMunich, Germany
| | - Robert McFarland
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Robert W. Taylor
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
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Brito S, Thompson K, Campistol J, Colomer J, Hardy SA, He L, Fernández-Marmiesse A, Palacios L, Jou C, Jiménez-Mallebrera C, Armstrong J, Montero R, Artuch R, Tischner C, Wenz T, McFarland R, Taylor RW. Long-term survival in a child with severe encephalopathy, multiple respiratory chain deficiency and GFM1 mutations. Front Genet 2015; 6:102. [PMID: 25852744 PMCID: PMC4369643 DOI: 10.3389/fgene.2015.00102] [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] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 02/26/2015] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Mitochondrial diseases due to deficiencies in the mitochondrial oxidative phosphorylation system (OXPHOS) can be associated with nuclear genes involved in mitochondrial translation, causing heterogeneous early onset and often fatal phenotypes. CASE REPORT The authors describe the clinical features and diagnostic workup of an infant who presented with an early onset severe encephalopathy, spastic-dystonic tetraparesis, failure to thrive, seizures and persistent lactic acidemia. Brain imaging revealed thinning of the corpus callosum and diffuse alteration of white matter signal. Genetic investigation confirmed two novel mutations in the GFM1 gene, encoding the mitochondrial translation elongation factor G1 (mtEFG1), resulting in combined deficiencies of OXPHOS. DISCUSSION The patient shares multiple clinical, laboratory and radiological similarities with the 11 reported patients with mutations involving this gene, but presents with a stable clinical course without metabolic decompensations, rather than a rapidly progressive fatal course. Defects in GFM1 gene confer high susceptibility to neurologic or hepatic dysfunction and this is, to the best of our knowledge, the first described patient who has survived beyond early childhood. Reporting of such cases is essential so as to delineate the key clinical and neuroradiological features of this disease and provide a more comprehensive view of its prognosis.
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Affiliation(s)
- Sara Brito
- Serviço de Pediatria, Centro Hospitalar de Leiria, Hospital de Santo AndréLeiria, Portugal
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
| | - Kyle Thompson
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Jaume Campistol
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
| | - Jaime Colomer
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
| | - Steven A. Hardy
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Langping He
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Ana Fernández-Marmiesse
- Diagnosis and Treatment Unit for Inborn Errors of Metabolism, Hospital Clínico Universitario de Santiago de CompostelaLa Coruña, Spain
| | | | - Cristina Jou
- Pathology Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Cecilia Jiménez-Mallebrera
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de DéuBarcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
| | - Judith Armstrong
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical, Genetics and Rett Unit, Laboratory Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Raquel Montero
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Rafael Artuch
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos IIIBarcelona, Spain
- Biochemical Department, Hospital Sant Joan de DéuEsplugues Barcelona, Spain
| | - Christin Tischner
- Cluster of Excellence: Cellular Stress Responses in Aging-Associated Diseases (CECAD), Institute for Genetics, University of CologneCologne, Germany
| | - Tina Wenz
- Cluster of Excellence: Cellular Stress Responses in Aging-Associated Diseases (CECAD), Institute for Genetics, University of CologneCologne, Germany
- German Network for Mitochondrial Disorders (mitoNET)Munich, Germany
| | - Robert McFarland
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
| | - Robert W. Taylor
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle UniversityNewcastle upon Tyne, UK
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