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Shi Z, Yang F, Hu Y, Pang Q, Shi L, Du T, Cao Y, Song B, Yu X, Cao Z, Ye Z, Liu C, Yu R, Chen X, Zhu Y, Pang Q. An oxidized dextran-composite self-healing coated magnesium scaffold reduces apoptosis to induce bone regeneration. Carbohydr Polym 2024; 327:121666. [PMID: 38171658 DOI: 10.1016/j.carbpol.2023.121666] [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: 09/29/2023] [Revised: 11/15/2023] [Accepted: 12/03/2023] [Indexed: 01/05/2024]
Abstract
Self-healing coatings have shown promise in controlling the degradation of scaffolds and addressing coating detachment issues. However, developing a self-healing coating for magnesium (Mg) possessing multiple biological functions in infectious environments remains a significant challenge. In this study, a self-healing coating was developed for magnesium scaffolds using oxidized dextran (OD), 3-aminopropyltriethoxysilane (APTES), and nano-hydroxyapatite (nHA) doped micro-arc oxidation (MHA), named OD-MHA/Mg. The results demonstrated that the OD-MHA coating effectively addresses coating detachment issues and controls the degradation of Mg in an infectious environment through self-healing mechanisms. Furthermore, the OD-MHA/Mg scaffold exhibits antibacterial, antioxidant, and anti-apoptotic properties, it also promotes bone repair by upregulating the expression of osteogenesis genes and proteins. The findings of this study indicate that the OD-MHA coated Mg scaffold possessing multiple biological functions presents a promising approach for addressing infectious bone defects. Additionally, the study showcases the potential of polysaccharides with multiple biological functions in facilitating tissue healing even in challenging environments.
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Affiliation(s)
- Zewen Shi
- Department of Orthopedics, Ningbo No. 2 Hospital, Ningbo 315000, China; Health Science Center, Ningbo University, Ningbo 315211, China; Department of Orthopaedics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Fang Yang
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Yiwei Hu
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Qian Pang
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Lin Shi
- Department of Orthopedics, Ningbo No. 2 Hospital, Ningbo 315000, China
| | - Tianyu Du
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Yuhao Cao
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Baiyang Song
- Health Science Center, Ningbo University, Ningbo 315211, China
| | - Xueqiang Yu
- Department of Radiology, Ningbo No. 2 Hospital, Ningbo 315000, China
| | - Zhaoxun Cao
- Department of Orthopaedics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Zhewei Ye
- Department of Orthopaedics, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chen Liu
- Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315100, China
| | - Rongyao Yu
- Department of Orthopedics, Ningbo No. 2 Hospital, Ningbo 315000, China; Health Science Center, Ningbo University, Ningbo 315211, China
| | - Xianjun Chen
- Department of Orthopedics, Ningbo No. 2 Hospital, Ningbo 315000, China; Health Science Center, Ningbo University, Ningbo 315211, China.
| | - Yabin Zhu
- Health Science Center, Ningbo University, Ningbo 315211, China.
| | - Qingjiang Pang
- Department of Orthopedics, Ningbo No. 2 Hospital, Ningbo 315000, China; Health Science Center, Ningbo University, Ningbo 315211, China.
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2
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Zhong H, Janer A, Khalimonchuk O, Antonicka H, Shoubridge E, Barrientos A. BOLA3 and NFU1 link mitoribosome iron-sulfur cluster assembly to multiple mitochondrial dysfunctions syndrome. Nucleic Acids Res 2023; 51:11797-11812. [PMID: 37823603 PMCID: PMC10681725 DOI: 10.1093/nar/gkad842] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Revised: 09/08/2023] [Accepted: 09/20/2023] [Indexed: 10/13/2023] Open
Abstract
The human mitochondrial ribosome contains three [2Fe-2S] clusters whose assembly pathway, role, and implications for mitochondrial and metabolic diseases are unknown. Here, structure-function correlation studies show that the clusters play a structural role during mitoribosome assembly. To uncover the assembly pathway, we have examined the effect of silencing the expression of Fe-S cluster biosynthetic and delivery factors on mitoribosome stability. We find that the mitoribosome receives its [2Fe-2S] clusters from the GLRX5-BOLA3 node. Additionally, the assembly of the small subunit depends on the mitoribosome biogenesis factor METTL17, recently reported containing a [4Fe-4S] cluster, which we propose is inserted via the ISCA1-NFU1 node. Consistently, fibroblasts from subjects suffering from 'multiple mitochondrial dysfunction' syndrome due to mutations in BOLA3 or NFU1 display previously unrecognized attenuation of mitochondrial protein synthesis that contributes to their cellular and pathophysiological phenotypes. Finally, we report that, in addition to their structural role, one of the mitoribosomal [2Fe-2S] clusters and the [4Fe-4S] cluster in mitoribosome assembly factor METTL17 sense changes in the redox environment, thus providing a way to regulate organellar protein synthesis accordingly.
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Affiliation(s)
- Hui Zhong
- Department of Biochemistry and Molecular Biology. University of Miami Miller School of Medicine, 1600 NW 10Ave. Miami, FL 33136, USA
| | - Alexandre Janer
- The Neuro and Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Oleh Khalimonchuk
- Department of Biochemistry. University of Nebraska-Lincoln; 1901 Vine St. Beadle Center, Lincoln, NE 68588, USA
- Nebraska Redox Biology Center. University of Nebraska-Lincoln; 1901 Vine St. Beadle Center, Lincoln, NE 68588, USA
| | - Hana Antonicka
- The Neuro and Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Eric A Shoubridge
- The Neuro and Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Antoni Barrientos
- Department of Biochemistry and Molecular Biology. University of Miami Miller School of Medicine, 1600 NW 10Ave. Miami, FL 33136, USA
- Department of Neurology. University of Miami Miller School of Medicine; 1600 NW 10 Ave., Miami, FL 33136, USA
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Coordination of metal center biogenesis in human cytochrome c oxidase. Nat Commun 2022; 13:3615. [PMID: 35750769 PMCID: PMC9232578 DOI: 10.1038/s41467-022-31413-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 06/16/2022] [Indexed: 01/12/2023] Open
Abstract
Mitochondrial cytochrome c oxidase (CcO) or respiratory chain complex IV is a heme aa3-copper oxygen reductase containing metal centers essential for holo-complex biogenesis and enzymatic function that are assembled by subunit-specific metallochaperones. The enzyme has two copper sites located in the catalytic core subunits. The COX1 subunit harbors the CuB site that tightly associates with heme a3 while the COX2 subunit contains the binuclear CuA site. Here, we report that in human cells the CcO copper chaperones form macromolecular assemblies and cooperate with several twin CX9C proteins to control heme a biosynthesis and coordinate copper transfer sequentially to the CuA and CuB sites. These data on CcO illustrate a mechanism that regulates the biogenesis of macromolecular enzymatic assemblies with several catalytic metal redox centers and prevents the accumulation of cytotoxic reactive assembly intermediates.
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4
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Anderson JM, Box JM, Stuart RA. The mitospecific domain of Mrp7 (bL27) supports mitochondrial translation during fermentation and is required for effective adaptation to respiration. Mol Biol Cell 2021; 33:ar7. [PMID: 34731012 PMCID: PMC8886811 DOI: 10.1091/mbc.e21-07-0370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We demonstrate here that mitoribosomal protein synthesis, responsible for the synthesis of oxidative phosphorylation (OXPHOS) subunits encoded by mitochondrial genome, occurs at high levels during glycolysis fermentation and in a manner uncoupled from OXPHOS complex assembly regulation. Furthermore, we provide evidence that the mitospecific domain of Mrp7 (bL27), a mitoribosomal component, is required to maintain mitochondrial protein synthesis during fermentation, but is not required under respiration growth conditions. Maintaining mitotranslation under high glucose fermentation conditions also involves Mam33 (p32/gC1qR homolog), a binding partner of Mrp7's mitospecific domain, and together they confer a competitive advantage for a cell's ability to adapt to respiration-based metabolism when glucose becomes limiting. Furthermore, our findings support that the mitoribosome, and specifically the central protuberance (CP) region, may be differentially regulated and/or assembled, under the different metabolic conditions of fermentation and respiration. Based on our findings, we propose the purpose of mitotranslation is not limited to the assembly of OXPHOS complexes, but also plays a role in mitochondrial signaling critical for switching cellular metabolism from a glycolysis- to a respiratory-based state.
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Affiliation(s)
| | - Jodie M Box
- Dept. of Biological Sciences, Marquette University, Milwaukee, WI, USA
| | - Rosemary A Stuart
- Dept. of Biological Sciences, Marquette University, Milwaukee, WI, USA
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5
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Mitochondrial contact site and cristae organizing system (MICOS) machinery supports heme biosynthesis by enabling optimal performance of ferrochelatase. Redox Biol 2021; 46:102125. [PMID: 34517185 PMCID: PMC8441213 DOI: 10.1016/j.redox.2021.102125] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 08/31/2021] [Accepted: 09/03/2021] [Indexed: 02/04/2023] Open
Abstract
Heme is an essential cofactor required for a plethora of cellular processes in eukaryotes. In metazoans the heme biosynthetic pathway is typically partitioned between the cytosol and mitochondria, with the first and final steps taking place in the mitochondrion. The pathway has been extensively studied and its biosynthetic enzymes structurally characterized to varying extents. Nevertheless, understanding of the regulation of heme synthesis and factors that influence this process in metazoans remains incomplete. Therefore, we investigated the molecular organization as well as the physical and genetic interactions of the terminal pathway enzyme, ferrochelatase (Hem15), in the yeast Saccharomyces cerevisiae. Biochemical and genetic analyses revealed dynamic association of Hem15 with Mic60, a core component of the mitochondrial contact site and cristae organizing system (MICOS). Loss of MICOS negatively impacts Hem15 activity, affects the size of the Hem15 high-mass complex, and results in accumulation of reactive and potentially toxic tetrapyrrole precursors that may cause oxidative damage. Restoring intermembrane connectivity in MICOS-deficient cells mitigates these cytotoxic effects. These data provide new insights into how heme biosynthetic machinery is organized and regulated, linking mitochondrial architecture-organizing factors to heme homeostasis.
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Bertgen L, Mühlhaus T, Herrmann JM. Clingy genes: Why were genes for ribosomal proteins retained in many mitochondrial genomes? BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2020; 1861:148275. [PMID: 32712152 DOI: 10.1016/j.bbabio.2020.148275] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/14/2020] [Accepted: 07/19/2020] [Indexed: 11/18/2022]
Abstract
Why mitochondria still retain their own genome is a puzzle given the enormous effort to maintain a mitochondrial translation machinery. Most mitochondrially encoded proteins are membrane-embedded subunits of the respiratory chain. Their hydrophobicity presumably impedes their import into mitochondria. However, many mitochondrial genomes also encode protein subunits of the mitochondrial ribosome. These proteins lack transmembrane domains and hydrophobicity cannot explain why their genes remained in mitochondria. In this review, we provide an overview about mitochondrially encoded subunits of mitochondrial ribosomes of fungi, plants and protists. Moreover, we discuss and evaluate different hypotheses which were put forward to explain why (ribosomal) proteins remained mitochondrially encoded. It seems likely that the synthesis of ribosomal proteins in the mitochondrial matrix is used to regulate the assembly of the mitochondrial ribosome within mitochondria and to avoid problems that mitochondrial proteins might pose for cytosolic proteostasis and for the assembly of cytosolic ribosomes.
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Affiliation(s)
- Lea Bertgen
- Cell Biology, University of Kaiserslautern, Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany
| | - Timo Mühlhaus
- Computational Systems Biology, University of Kaiserslautern, Erwin-Schrödinger-Straße 23, 67663 Kaiserslautern, Germany
| | - Johannes M Herrmann
- Cell Biology, University of Kaiserslautern, Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany.
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7
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Zhai XT, Wei SS, Liang WQ, Bai JT, Jia N, Li B. Arabidopsis mtHSC70-1 physically interacts with the Cox2 subunit of cytochrome c oxidase. PLANT SIGNALING & BEHAVIOR 2020; 15:1714189. [PMID: 31933409 PMCID: PMC7053962 DOI: 10.1080/15592324.2020.1714189] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/04/2020] [Accepted: 01/07/2020] [Indexed: 06/03/2023]
Abstract
The 70-kD heat shock proteins (HSP70s or HSC70s) function as molecular chaperones and are involved in diverse cellular processes. We recently demonstrated the roles of mitochondrial HSC70-1 (mtHSC70-1) in the establishment of cytochrome c oxidase (COX)-dependent respiration and redox homeostasis in Arabidopsis thaliana. Defects in COX assembly were observed in the mtHSC70-1 knockout lines. The levels of Cox2 (COX subunit 2) proteins in COX complex were markedly lower in the mutants than in wild-type plants; however, the levels of total Cox2 proteins in the mutants were not obviously different from those in wild-type plants, suggesting that the stability of COX or the availability of Cox2 was impaired in the mtHSC70-1 mutants. Here, we further detected the interaction between mtHSC70-1 and Cox2 proteins through co-immunoprecipitation, pull-down and firefly luciferase complementation imaging assays. The results showed that mtHSC70-1 could directly combine Cox2 in vivo and in vitro, providing supporting evidence for the role of mtHSC70-1 in COX assembly.
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Affiliation(s)
- Xiao-Ting Zhai
- College of Life Science, Hebei Normal University, Shijiazhuang, China
| | - Shan-Shan Wei
- College of Life Science, Hebei Normal University, Shijiazhuang, China
| | - Wei-Qian Liang
- College of Life Science, Hebei Normal University, Shijiazhuang, China
| | - Jiao-Teng Bai
- College of Life Science, Hebei Normal University, Shijiazhuang, China
| | - Ning Jia
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Bing Li
- College of Life Science, Hebei Normal University, Shijiazhuang, China
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8
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Mays JN, Camacho-Villasana Y, Garcia-Villegas R, Perez-Martinez X, Barrientos A, Fontanesi F. The mitoribosome-specific protein mS38 is preferentially required for synthesis of cytochrome c oxidase subunits. Nucleic Acids Res 2019; 47:5746-5760. [PMID: 30968120 PMCID: PMC6582356 DOI: 10.1093/nar/gkz266] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 03/26/2019] [Accepted: 04/02/2019] [Indexed: 12/20/2022] Open
Abstract
Message-specific translational regulation mechanisms shape the biogenesis of multimeric oxidative phosphorylation (OXPHOS) enzyme in mitochondria from the yeast Saccharomyces cerevisiae. These mechanisms, driven mainly by the action of mRNA-specific translational activators, help to coordinate synthesis of OXPHOS catalytic subunits by the mitoribosomes with both the import of their nucleus-encoded partners and their assembly to form the holocomplexes. However, little is known regarding the role that the mitoribosome itself may play in mRNA-specific translational regulation. Here, we show that the mitoribosome small subunit protein Cox24/mS38, known to be necessary for mitoribosome-specific intersubunit bridge formation and 15S rRNA H44 stabilization, is required for efficient mitoribogenesis. Consequently, mS38 is necessary to sustain the overall mitochondrial protein synthesis rate, despite an adaptive ∼2-fold increase in mitoribosome abundance in mS38-deleted cells. Additionally, the absence of mS38 preferentially disturbs translation initiation of COX1, COX2, and COX3 mRNAs, without affecting the levels of mRNA-specific translational activators. We propose that mS38 confers the mitochondrial ribosome an intrinsic capacity of translational regulation, probably acquired during evolution from bacterial ribosomes to facilitate the translation of mitochondrial mRNAs, which lack typical anti-Shine-Dalgarno sequences.
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Affiliation(s)
- Jeffri-Noelle Mays
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Yolanda Camacho-Villasana
- Departamento de Genetica Molecular, Instituto de Fisiologiía Celular, Universidad Nacional Autonoma de Mexico, Mexico City 04510, Mexico
| | - Rodolfo Garcia-Villegas
- Departamento de Genetica Molecular, Instituto de Fisiologiía Celular, Universidad Nacional Autonoma de Mexico, Mexico City 04510, Mexico
| | - Xochitl Perez-Martinez
- Departamento de Genetica Molecular, Instituto de Fisiologiía Celular, Universidad Nacional Autonoma de Mexico, Mexico City 04510, Mexico
| | - Antoni Barrientos
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.,Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Flavia Fontanesi
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
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9
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Ko KY, Lee JH, Jang JK, Jin Y, Kang H, Kim IY. S-Glutathionylation of mouse selenoprotein W prevents oxidative stress-induced cell death by blocking the formation of an intramolecular disulfide bond. Free Radic Biol Med 2019; 141:362-371. [PMID: 31299423 DOI: 10.1016/j.freeradbiomed.2019.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/20/2019] [Accepted: 07/08/2019] [Indexed: 12/15/2022]
Abstract
Mouse selenoprotein W (SELENOW) is a small protein containing a selenocysteine (Sec, U) and four cysteine (Cys, C) residues. The Sec residue in SELENOW is located within the conserved CXXU motif corresponding to the CXXC redox motif of thioredoxin (Trx). It is known that glutathione (GSH) binds to SELENOW and that this binding is involved in protecting cells from oxidative stress. However, the regulatory mechanisms controlling the glutathionylation of SELENOW in oxidative stress are unclear. In this study, using purified recombinant SELENOW in which Sec13 was changed to Cys, we found that SELENOW was glutathionylated at Cys33 and that this S-glutathionylation was enhanced by oxidative stress. We also found that the S-glutathionylation of SELENOW at Cys33 in HEK293 cells was due to glutathione S-transferase Pi (GSTpi) and that this modification was reversed by glutaredoxin1 (Grx1). In addition to the disulfide bond between the Cys10 and Cys13 of SELENOW, a second disulfide bond was formed between Cys33 and Cys87 under oxidative stress conditions. The second disulfide bond was reduced by Trx1, but the disulfide bond between Cys10 and Cys13 was not. The second disulfide bond was also reduced by glutathione, but the disulfide bond in the CXXC motif was not. The second disulfide bond of the mutant SELENOW, in which Cys37 was replaced with Ser, was formed at a much lower concentration of hydrogen peroxide than the wild type. We also observed that Cys37 was required for S-glutathionylation, and that S-glutathionylated SELENOW containing Cys37 protected the cells from oxidative stress. Furthermore, the SELENOW (C33, 87S) mutant, which could not form the second disulfide bond, also showed antioxidant activity. Taken together, these results indicate that GSTpi-mediated S-glutathionylation of mouse SELENOW at Cys33 is required for the protection of cells in conditions of oxidative stress, through inhibition of the formation of the second disulfide bond.
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Affiliation(s)
- Kwan Young Ko
- Laboratory of Cellular and Molecular Biochemistry, Department of Life Sciences, Korea University, Seoul, 02841, South Korea
| | - Jea Hwang Lee
- Center for Human Genetic Research, Massachusetts General Hospital, 185 Cambridge ST, Boston, MA, 02114-2790, USA
| | - Jun Ki Jang
- Laboratory of Cellular and Molecular Biochemistry, Department of Life Sciences, Korea University, Seoul, 02841, South Korea
| | - Yunjung Jin
- Laboratory of Cellular and Molecular Biochemistry, Department of Life Sciences, Korea University, Seoul, 02841, South Korea
| | - Hyunwoo Kang
- Laboratory of Cellular and Molecular Biochemistry, Department of Life Sciences, Korea University, Seoul, 02841, South Korea
| | - Ick Young Kim
- Laboratory of Cellular and Molecular Biochemistry, Department of Life Sciences, Korea University, Seoul, 02841, South Korea.
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Meyer EH, Welchen E, Carrie C. Assembly of the Complexes of the Oxidative Phosphorylation System in Land Plant Mitochondria. ANNUAL REVIEW OF PLANT BIOLOGY 2019; 70:23-50. [PMID: 30822116 DOI: 10.1146/annurev-arplant-050718-100412] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Plant mitochondria play a major role during respiration by producing the ATP required for metabolism and growth. ATP is produced during oxidative phosphorylation (OXPHOS), a metabolic pathway coupling electron transfer with ADP phosphorylation via the formation and release of a proton gradient across the inner mitochondrial membrane. The OXPHOS system is composed of large, multiprotein complexes coordinating metal-containing cofactors for the transfer of electrons. In this review, we summarize the current state of knowledge about assembly of the OXPHOS complexes in land plants. We present the different steps involved in the formation of functional complexes and the regulatory mechanisms controlling the assembly pathways. Because several assembly steps have been found to be ancestral in plants-compared with those described in fungal and animal models-we discuss the evolutionary dynamics that lead to the conservation of ancestral pathways in land plant mitochondria.
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Affiliation(s)
- Etienne H Meyer
- Organelle Biology and Biotechnology Research Group, Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany
- Current affiliation: Institute of Plant Physiology, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany;
| | - Elina Welchen
- Cátedra de Biología Celular y Molecular, Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina
| | - Chris Carrie
- Plant Sciences Research Group, Department Biologie I, Ludwig-Maximilians-Universität, 82152 Planegg-Martinsried, Germany
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Mansilla N, Racca S, Gras DE, Gonzalez DH, Welchen E. The Complexity of Mitochondrial Complex IV: An Update of Cytochrome c Oxidase Biogenesis in Plants. Int J Mol Sci 2018; 19:ijms19030662. [PMID: 29495437 PMCID: PMC5877523 DOI: 10.3390/ijms19030662] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 01/26/2018] [Accepted: 01/29/2018] [Indexed: 12/20/2022] Open
Abstract
Mitochondrial respiration is an energy producing process that involves the coordinated action of several protein complexes embedded in the inner membrane to finally produce ATP. Complex IV or Cytochrome c Oxidase (COX) is the last electron acceptor of the respiratory chain, involved in the reduction of O2 to H2O. COX is a multimeric complex formed by multiple structural subunits encoded in two different genomes, prosthetic groups (heme a and heme a3), and metallic centers (CuA and CuB). Tens of accessory proteins are required for mitochondrial RNA processing, synthesis and delivery of prosthetic groups and metallic centers, and for the final assembly of subunits to build a functional complex. In this review, we perform a comparative analysis of COX composition and biogenesis factors in yeast, mammals and plants. We also describe possible external and internal factors controlling the expression of structural proteins and assembly factors at the transcriptional and post-translational levels, and the effect of deficiencies in different steps of COX biogenesis to infer the role of COX in different aspects of plant development. We conclude that COX assembly in plants has conserved and specific features, probably due to the incorporation of a different set of subunits during evolution.
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Affiliation(s)
- Natanael Mansilla
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina.
| | - Sofia Racca
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina.
| | - Diana E Gras
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina.
| | - Daniel H Gonzalez
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina.
| | - Elina Welchen
- Instituto de Agrobiotecnología del Litoral (CONICET-UNL), Cátedra de Biología Celular y Molecular, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe, Argentina.
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12
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Derbikova KS, Levitsky SA, Chicherin IV, Vinogradova EN, Kamenski PA. Activation of Yeast Mitochondrial Translation: Who Is in Charge? BIOCHEMISTRY (MOSCOW) 2018; 83:87-97. [DOI: 10.1134/s0006297918020013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Box JM, Kaur J, Stuart RA. MrpL35, a mitospecific component of mitoribosomes, plays a key role in cytochrome c oxidase assembly. Mol Biol Cell 2017; 28:3489-3499. [PMID: 28931599 PMCID: PMC5683760 DOI: 10.1091/mbc.e17-04-0239] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 08/28/2017] [Accepted: 09/11/2017] [Indexed: 01/03/2023] Open
Abstract
Mitoribosomes perform the synthesis of the core components of the oxidative phosphorylation (OXPHOS) system encoded by the mitochondrial genome. We provide evidence that MrpL35 (mL38), a mitospecific component of the yeast mitoribosomal central protuberance, assembles into a subcomplex with MrpL7 (uL5), Mrp7 (bL27), and MrpL36 (bL31) and mitospecific proteins MrpL17 (mL46) and MrpL28 (mL40). We isolated respiratory defective mrpL35 mutant yeast strains, which do not display an overall inhibition in mitochondrial protein synthesis but rather have a problem in cytochrome c oxidase complex (COX) assembly. Our findings indicate that MrpL35, with its partner Mrp7, play a key role in coordinating the synthesis of the Cox1 subunit with its assembly into the COX enzyme and in a manner that involves the Cox14 and Coa3 proteins. We propose that MrpL35 and Mrp7 are regulatory subunits of the mitoribosome acting to coordinate protein synthesis and OXPHOS assembly events and thus the bioenergetic capacity of the mitochondria.
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Affiliation(s)
- Jodie M Box
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53233
| | - Jasvinder Kaur
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53233
| | - Rosemary A Stuart
- Department of Biological Sciences, Marquette University, Milwaukee, WI 53233
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Tissue- and Condition-Specific Isoforms of Mammalian Cytochrome c Oxidase Subunits: From Function to Human Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:1534056. [PMID: 28593021 PMCID: PMC5448071 DOI: 10.1155/2017/1534056] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 03/29/2017] [Indexed: 01/05/2023]
Abstract
Cytochrome c oxidase (COX) is the terminal enzyme of the electron transport chain and catalyzes the transfer of electrons from cytochrome c to oxygen. COX consists of 14 subunits, three and eleven encoded, respectively, by the mitochondrial and nuclear DNA. Tissue- and condition-specific isoforms have only been reported for COX but not for the other oxidative phosphorylation complexes, suggesting a fundamental requirement to fine-tune and regulate the essentially irreversible reaction catalyzed by COX. This article briefly discusses the assembly of COX in mammals and then reviews the functions of the six nuclear-encoded COX subunits that are expressed as isoforms in specialized tissues including those of the liver, heart and skeletal muscle, lung, and testes: COX IV-1, COX IV-2, NDUFA4, NDUFA4L2, COX VIaL, COX VIaH, COX VIb-1, COX VIb-2, COX VIIaH, COX VIIaL, COX VIIaR, COX VIIIH/L, and COX VIII-3. We propose a model in which the isoforms mediate the interconnected regulation of COX by (1) adjusting basal enzyme activity to mitochondrial capacity of a given tissue; (2) allosteric regulation to adjust energy production to need; (3) altering proton pumping efficiency under certain conditions, contributing to thermogenesis; (4) providing a platform for tissue-specific signaling; (5) stabilizing the COX dimer; and (6) modulating supercomplex formation.
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Mayorga JP, Camacho-Villasana Y, Shingú-Vázquez M, García-Villegas R, Zamudio-Ochoa A, García-Guerrero AE, Hernández G, Pérez-Martínez X. A Novel Function of Pet54 in Regulation of Cox1 Synthesis in Saccharomyces cerevisiae Mitochondria. J Biol Chem 2016; 291:9343-55. [PMID: 26929411 DOI: 10.1074/jbc.m116.721985] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 12/21/2022] Open
Abstract
Cytochrome c oxidase assembly requires the synthesis of the mitochondria-encoded core subunits, Cox1, Cox2, and Cox3. In yeast, Pet54 protein is required to activate translation of the COX3 mRNA and to process the aI5β intron on the COX1 transcript. Here we report a third, novel function of Pet54 on Cox1 synthesis. We observed that Pet54 is necessary to achieve an efficient Cox1 synthesis. Translation of the COX1 mRNA is coupled to the assembly of cytochrome c oxidase by a mechanism that involves Mss51. This protein activates translation of the COX1 mRNA by acting on the COX1 5'-UTR, and, in addition, it interacts with the newly synthesized Cox1 protein in high molecular weight complexes that include the factors Coa3 and Cox14. Deletion of Pet54 decreased Cox1 synthesis, and, in contrast to what is commonly observed for other assembly mutants, double deletion of cox14 or coa3 did not recover Cox1 synthesis. Our results show that Pet54 is a positive regulator of Cox1 synthesis that renders Mss51 competent as a translational activator of the COX1 mRNA and that this role is independent of the assembly feedback regulatory loop of Cox1 synthesis. Pet54 may play a role in Mss51 hemylation/conformational change necessary for translational activity. Moreover, Pet54 physically interacts with the COX1 mRNA, and this binding was independent of the presence of Mss51.
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Affiliation(s)
- Juan Pablo Mayorga
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Yolanda Camacho-Villasana
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Miguel Shingú-Vázquez
- the Department of Biochemistry and Molecular Biology, School of Biomedical Sciences Monash University, Clayton, Victoria 3800, Australia, and
| | - Rodolfo García-Villegas
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Angélica Zamudio-Ochoa
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Aldo E García-Guerrero
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Greco Hernández
- the Division of Basic Research, National Institute of Cancer (INCan), Mexico City 14080, Mexico
| | - Xochitl Pérez-Martínez
- From the Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico,
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