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Dinh N, Bonnefoy N. Schizosaccharomyces pombe as a fundamental model for research on mitochondrial gene expression: Progress, achievements and outlooks. IUBMB Life 2024; 76:397-419. [PMID: 38117001 DOI: 10.1002/iub.2801] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 11/17/2023] [Indexed: 12/21/2023]
Abstract
Schizosaccharomyces pombe (fission yeast) is an attractive model for mitochondrial research. The organism resembles human cells in terms of mitochondrial inheritance, mitochondrial transport, sugar metabolism, mitogenome structure and dependence of viability on the mitogenome (the petite-negative phenotype). Transcriptions of these genomes produce only a few polycistronic transcripts, which then undergo processing as per the tRNA punctuation model. In general, the machinery for mitochondrial gene expression is structurally and functionally conserved between fission yeast and humans. Furthermore, molecular research on S. pombe is supported by a considerable number of experimental techniques and database resources. Owing to these advantages, fission yeast has significantly contributed to biomedical and fundamental research. Here, we review the current state of knowledge regarding S. pombe mitochondrial gene expression, and emphasise the pertinence of fission yeast as both a model and tool, especially for studies on mitochondrial translation.
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Affiliation(s)
- Nhu Dinh
- Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette cedex, France
| | - Nathalie Bonnefoy
- Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette cedex, France
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2
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Wang Y, Feng G, Huang Y. The Schizosaccharomyces pombe DEAD-box protein Mss116 is required for mitoribosome assembly and mitochondrial translation. Mitochondrion 2024; 76:101881. [PMID: 38604460 DOI: 10.1016/j.mito.2024.101881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/02/2024] [Accepted: 04/07/2024] [Indexed: 04/13/2024]
Abstract
DEAD-box helicases are important players in mitochondrial gene expression, which is necessary for mitochondrial respiration. In this study, we characterized Schizosaccharomyces pombe Mss116 (spMss116), a member of the family of DEAD-box RNA helicases. Deletion of spmss116 in a mitochondrial intron-containing background significantly reduced the levels of mitochondrial DNA (mtDNA)-encoded cox1 and cob1 mRNAs and impaired mitochondrial translation, leading to a severe respiratory defect and a loss of cell viability during stationary phase. Deletion of mitochondrial introns restored the levels of cox1 and cob1 mRNAs to wide-type (WT) levels but could not restore mitochondrial translation and respiration in Δspmss116 cells. Furthermore, deletion of spmss116 in both mitochondrial intron-containing and intronless backgrounds impaired mitoribosome assembly and destabilization of mitoribosomal proteins. Our findings suggest that defective mitochondrial translation caused by deletion of spmss116 is most likely due to impaired mitoribosome assembly.
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Affiliation(s)
- Yirong Wang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Gang Feng
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China.
| | - Ying Huang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China.
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3
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Wang Y, Jin T, Huang Y. Sls1 and Mtf2 mediate the assembly of the Mrh5C complex required for activation of cox1 mRNA translation. J Biol Chem 2024; 300:107176. [PMID: 38499152 PMCID: PMC11015131 DOI: 10.1016/j.jbc.2024.107176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/06/2024] [Accepted: 03/09/2024] [Indexed: 03/20/2024] Open
Abstract
Mitochondrial translation depends on mRNA-specific activators. In Schizosaccharomyces pombe, DEAD-box protein Mrh5, pentatricopeptide repeat (PPR) protein Ppr4, Mtf2, and Sls1 form a stable complex (designated Mrh5C) required for translation of mitochondrial DNA (mtDNA)-encoded cox1 mRNA, the largest subunit of the cytochrome c oxidase complex. However, how Mrh5C is formed and what role Mrh5C plays in cox1 mRNA translation have not been reported. To address these questions, we investigated the role of individual Mrh5C subunits in the assembly and function of Mrh5C. Our results revealed that Mtf2 and Sls1 form a subcomplex that serves as a scaffold to bring Mrh5 and Ppr4 together. Mrh5C binds to the small subunit of the mitoribosome (mtSSU), but each subunit could not bind to the mtSSU independently. Importantly, Mrh5C is required for the association of cox1 mRNA with the mtSSU. Finally, we investigated the importance of the signature DEAD-box in Mrh5. We found that the DEAD-box of Mrh5 is required for the association of Mrh5C and cox1 mRNA with the mtSSU. Unexpectedly, this motif is also required for the interaction of Mrh5 with other Mrh5C subunits. Altogether, our results suggest that Mrh5 and Ppr4 cooperate in activating the translation of cox1 mRNA. Our results also suggest that Mrh5C activates the translation of cox1 mRNA by promoting the recruitment of cox1 mRNA to the mtSSU.
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Affiliation(s)
- Yirong Wang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Nanjing Normal University, Nanjing, China
| | - Ting Jin
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Nanjing Normal University, Nanjing, China
| | - Ying Huang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Nanjing Normal University, Nanjing, China.
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4
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Ronayne CT, Jackson TD, Bennett CF, Perry EA, Kantorovic N, Puigserver P. Tetracyclines activate mitoribosome quality control and reduce ER stress to promote cell survival. EMBO Rep 2023; 24:e57228. [PMID: 37818824 DOI: 10.15252/embr.202357228] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/13/2023] Open
Abstract
Mitochondrial diseases are a group of disorders defined by defects in oxidative phosphorylation caused by nuclear- or mitochondrial-encoded gene mutations. A main cellular phenotype of mitochondrial disease mutations is redox imbalances and inflammatory signaling underlying pathogenic signatures of these patients. One method to rescue this cell death vulnerability is the inhibition of mitochondrial translation using tetracyclines. However, the mechanisms whereby tetracyclines promote cell survival are unknown. Here, we show that tetracyclines inhibit the mitochondrial ribosome and promote survival through suppression of endoplasmic reticulum (ER) stress. Tetracyclines increase mitochondrial levels of the mitoribosome quality control factor MALSU1 (Mitochondrial Assembly of Ribosomal Large Subunit 1) and promote its recruitment to the mitoribosome large subunit, where MALSU1 is necessary for tetracycline-induced survival and suppression of ER stress. Glucose starvation induces ER stress to activate the unfolded protein response and IRE1α-mediated cell death that is inhibited by tetracyclines. These studies establish a new interorganelle communication whereby inhibition of the mitoribosome signals to the ER to promote survival, implicating basic mechanisms of cell survival and treatment of mitochondrial diseases.
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Affiliation(s)
- Conor T Ronayne
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Thomas D Jackson
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Christopher F Bennett
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Elizabeth A Perry
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Noa Kantorovic
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Pere Puigserver
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
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5
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Baleva MV, Piunova UE, Chicherin IV, Levitskii SA, Kamenski PA. Diversity and Evolution of Mitochondrial Translation Apparatus. BIOCHEMISTRY. BIOKHIMIIA 2023; 88:1832-1843. [PMID: 38105202 DOI: 10.1134/s0006297923110135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 12/19/2023]
Abstract
The evolution of mitochondria has proceeded independently in different eukaryotic lines, which is reflected in the diversity of mitochondrial genomes and mechanisms of their expression in eukaryotic species. Mitochondria have lost most of bacterial ancestor genes by transferring them to the nucleus or eliminating them. However, mitochondria of almost all eukaryotic cells still retain relatively small genomes, as well as their replication, transcription, and translation apparatuses. The dependence on the nuclear genome, specific features of mitochondrial transcripts, and synthesis of highly hydrophobic membrane proteins in the mitochondria have led to significant changes in the translation apparatus inherited from the bacterial ancestor, which retained the basic structure necessary for protein synthesis but became more specialized and labile. In this review, we discuss specific properties of translation initiation in the mitochondria and how the evolution of mitochondria affected the functions of main factors initiating protein biosynthesis in these organelles.
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Affiliation(s)
- Mariya V Baleva
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Ulyana E Piunova
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Ivan V Chicherin
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Sergey A Levitskii
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Piotr A Kamenski
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia.
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Wang Y, Luo Y, Huang Y. Schizosaccharomyces pombe
Sls1 is primarily required for
cox1
mRNA translation. Yeast 2022; 39:521-534. [DOI: 10.1002/yea.3813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 07/26/2022] [Accepted: 09/08/2022] [Indexed: 11/10/2022] Open
Affiliation(s)
- Yirong Wang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life SciencesNanjing Normal University1 Wenyuan RoadNanjing210023China
| | - Ying Luo
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life SciencesNanjing Normal University1 Wenyuan RoadNanjing210023China
| | - Ying Huang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, School of Life SciencesNanjing Normal University1 Wenyuan RoadNanjing210023China
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7
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Luo Y, Wang Y, Huang Y. Schizosaccharomyces pombe Ppr10 and Mpa1 together mediate mitochondrial translational initiation. J Biol Chem 2021; 297:100869. [PMID: 34119521 PMCID: PMC8258696 DOI: 10.1016/j.jbc.2021.100869] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/04/2021] [Accepted: 06/09/2021] [Indexed: 12/26/2022] Open
Abstract
Pentatricopeptide repeat (PPR) proteins are a large family of proteins that act primarily at different posttranscriptional steps of organellar gene expression. We have previously found that the Schizosaccharomyces pombe PPR protein mpal10 interacts with mitochondrial translational activator Mpa1, and both are essential for mitochondrial protein synthesis. However, it is unclear how these two proteins function in mitochondrial protein synthesis in S. pombe. In this study, we further investigated the role of Ppr10 and Mpa1 in mitochondrial protein synthesis. Mitochondrial translational initiation requires two initiation factors, Mti2 and Mti3, which bind to the small subunit of the mitochondrial ribosome (mt-SSU) during the formation of the mitochondrial translational initiation complex. Using sucrose gradient sedimentation analysis, we found that disruption of ppr10, mpa1, or the PPR motifs in Ppr10 impairs the association of Mti2 and Mti3 with the mt-SSU, suggesting that both Ppr10 and Mpa1 may be required for the interaction of Mti2 and Mti3 with the mt-SSU during the assembly of mitochondrial translational initiation complex. Loss of Ppr10 perturbs the association of mitochondrially encoded cytochrome b (cob1) and cytochrome c oxidase subunit 1 (cox1) mRNAs with assembled mitochondrial ribosomes. Proteomic analysis revealed that a fraction of Ppr10 and Mpa1 copurified with a subset of mitoribosomal proteins. The PPR motifs of Ppr10 are necessary for its interaction with Mpa1 and that disruption of these PPR motifs impairs mitochondrial protein synthesis. Our results suggest that Ppr10 and Mpa1 function together to mediate mitochondrial translational initiation.
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Affiliation(s)
- Ying Luo
- Jiangsu Key Laboratory for Microbes and Genomics, School of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yirong Wang
- Jiangsu Key Laboratory for Microbes and Genomics, School of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Ying Huang
- Jiangsu Key Laboratory for Microbes and Genomics, School of Life Sciences, Nanjing Normal University, Nanjing, China.
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8
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Rasul F, Zheng F, Dong F, He J, Liu L, Liu W, Cheema JY, Wei W, Fu C. Emr1 regulates the number of foci of the endoplasmic reticulum-mitochondria encounter structure complex. Nat Commun 2021; 12:521. [PMID: 33483504 PMCID: PMC7822926 DOI: 10.1038/s41467-020-20866-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 12/16/2020] [Indexed: 11/21/2022] Open
Abstract
The endoplasmic reticulum-mitochondria encounter structure (ERMES) complex creates contact sites between the endoplasmic reticulum and mitochondria, playing crucial roles in interorganelle communication, mitochondrial fission, mtDNA inheritance, lipid transfer, and autophagy. The mechanism regulating the number of ERMES foci within the cell remains unclear. Here, we demonstrate that the mitochondrial membrane protein Emr1 contributes to regulating the number of ERMES foci. We show that the absence of Emr1 significantly decreases the number of ERMES foci. Moreover, we find that Emr1 interacts with the ERMES core component Mdm12 and colocalizes with Mdm12 on mitochondria. Similar to ERMES mutant cells, cells lacking Emr1 display defective mitochondrial morphology and impaired mitochondrial segregation, which can be rescued by an artificial tether capable of linking the endoplasmic reticulum and mitochondria. We further demonstrate that the cytoplasmic region of Emr1 is required for regulating the number of ERMES foci. This work thus reveals a crucial regulatory protein necessary for ERMES functions and provides mechanistic insights into understanding the dynamic regulation of endoplasmic reticulum-mitochondria communication. Interorganelle membrane contact sites between the endoplasmic reticulum and mitochondria can be mediated with the ER-mitochondria encounter structure (ERMES) complex, though precise regulation is unclear. Here, the authors report that the number of ERMES foci is regulated by the previously uncharacterized mitochondrial membrane protein Emr1.
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Affiliation(s)
- Faiz Rasul
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Fan Zheng
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Fenfen Dong
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Jiajia He
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Ling Liu
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Wenyue Liu
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Javairia Yousuf Cheema
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China
| | - Wenfan Wei
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China.
| | - Chuanhai Fu
- Ministry of Education Key Laboratory for Membrane-less Organelles & Cellular Dynamics, CAS Center for Excellence in Molecular Cell Sciences, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, People's Republic of China.
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