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Conserved and Opposite Transcriptome Patterns during Germination in Hordeum vulgare and Arabidopsis thaliana. Int J Mol Sci 2020; 21:ijms21197404. [PMID: 33036486 PMCID: PMC7584043 DOI: 10.3390/ijms21197404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/27/2020] [Accepted: 09/28/2020] [Indexed: 11/16/2022] Open
Abstract
Seed germination is a critical process for completion of the plant life cycle and for global food production. Comparing the germination transcriptomes of barley (Hordeum vulgare) to Arabidopsis thaliana revealed the overall pattern was conserved in terms of functional gene ontology; however, many oppositely responsive orthologous genes were identified. Conserved processes included a set of approximately 6000 genes that peaked early in germination and were enriched in processes associated with RNA metabolism, e.g., pentatricopeptide repeat (PPR)-containing proteins. Comparison of orthologous genes revealed more than 3000 orthogroups containing almost 4000 genes that displayed similar expression patterns including functions associated with mitochondrial tricarboxylic acid (TCA) cycle, carbohydrate and RNA/DNA metabolism, autophagy, protein modifications, and organellar function. Biochemical and proteomic analyses indicated mitochondrial biogenesis occurred early in germination, but detailed analyses revealed the timing involved in mitochondrial biogenesis may vary between species. More than 1800 orthogroups representing 2000 genes displayed opposite patterns in transcript abundance, representing functions of energy (carbohydrate) metabolism, photosynthesis, protein synthesis and degradation, and gene regulation. Differences in expression of basic-leucine zippers (bZIPs) and Apetala 2 (AP2)/ethylene-responsive element binding proteins (EREBPs) point to differences in regulatory processes at a high level, which provide opportunities to modify processes in order to enhance grain quality, germination, and storage as needed for different uses.
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Yin G, Whelan J, Wu S, Zhou J, Chen B, Chen X, Zhang J, He J, Xin X, Lu X. Comprehensive Mitochondrial Metabolic Shift during the Critical Node of Seed Ageing in Rice. PLoS One 2016; 11:e0148013. [PMID: 27124767 PMCID: PMC4849721 DOI: 10.1371/journal.pone.0148013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 01/12/2016] [Indexed: 11/19/2022] Open
Abstract
The critical node (CN) in seed aging in rice (Oryza sativa) is the transformation from Phase I (P-I) to Phase II (P-II) of the reverse S-shaped curve (RS-SC). Although mitochondrial dysfunction plays a key role in seed ageing, the metabolic shift in the CN remains poorly understood. Here, we investigated the mitochondrial regulatory mechanisms during the CN of rice seed ageing. We showed that during the CN of seed ageing, the mitochondrial ultrastructure was impaired, causing oxygen consumption to decrease, along with cytochrome c (cyt c) oxidase and malate dehydrogenase (MDH) activity. In addition, the transcript levels for the alternative pathway of the electron transport chain (ETC) were significantly induced, whereas the transcripts of the cytochrome oxidase (COX) pathway were inhibited. These changes were concomitant with the down-regulation of mitochondrial protein levels related to carbon and nitrogen metabolism, ATP synthase (ATPase) complex, tricarboxylic acid cycle (TCA) cycle, mitochondrial oxidative enzymes, and a variety of other proteins. Therefore, while these responses inhibit the production of ATP and its intermediates, signals from mitochondria (such as the decrease of cyt c and accumulation of reactive oxygen species (ROS)) may also induce oxidative damage. These events provide considerable information about the mitochondrial metabolic shifts involved in the progression of seed ageing in the CN.
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Affiliation(s)
- Guangkun Yin
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - James Whelan
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Science, La Trobe University, Bundoora, Victoria 3083, Australia
| | - Shuhua Wu
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jing Zhou
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Baoyin Chen
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Fujian Agriculture & Forestry University, Fuzhou, Fujian, 350002, China
| | - Xiaoling Chen
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jinmei Zhang
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Juanjuan He
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xia Xin
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- * E-mail: (XL); (XX)
| | - Xinxiong Lu
- National Genebank, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- * E-mail: (XL); (XX)
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Zancani M, Casolo V, Petrussa E, Peresson C, Patui S, Bertolini A, De Col V, Braidot E, Boscutti F, Vianello A. The Permeability Transition in Plant Mitochondria: The Missing Link. FRONTIERS IN PLANT SCIENCE 2015; 6:1120. [PMID: 26697057 PMCID: PMC4678196 DOI: 10.3389/fpls.2015.01120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 11/26/2015] [Indexed: 05/17/2023]
Abstract
The synthesis of ATP in mitochondria is dependent on a low permeability of the inner membrane. Nevertheless, mitochondria can undergo an increased permeability to solutes, named permeability transition (PT) that is mediated by a permeability transition pore (PTP). PTP opening requires matrix Ca(2+) and leads to mitochondrial swelling and release of intramembrane space proteins (e.g., cytochrome c). This feature has been initially observed in mammalian mitochondria and tentatively attributed to some components present either in the outer or inner membrane. Recent works on mammalian mitochondria point to mitochondrial ATP synthase dimers as physical basis for PT, a finding that has been substantiated in yeast and Drosophila mitochondria. In plant mitochondria, swelling and release of proteins have been linked to programmed cell death, but in isolated mitochondria PT has been observed in only a few cases and in plant cell cultures only indirect evidence is available. The possibility that mitochondrial ATP synthase dimers could function as PTP also in plants is discussed here on the basis of the current evidence. Finally, a hypothetical explanation for the origin of PTP is provided in the framework of molecular exaptation.
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Nelson CJ, Alexova R, Jacoby RP, Millar AH. Proteins with high turnover rate in barley leaves estimated by proteome analysis combined with in planta isotope labeling. PLANT PHYSIOLOGY 2014; 166:91-108. [PMID: 25082890 PMCID: PMC4149734 DOI: 10.1104/pp.114.243014] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Protein turnover is a key component in cellular homeostasis; however, there is little quantitative information on degradation kinetics for individual plant proteins. We have used (15)N labeling of barley (Hordeum vulgare) plants and gas chromatography-mass spectrometry analysis of free amino acids and liquid chromatography-mass spectrometry analysis of proteins to track the enrichment of (15)N into the amino acid pools in barley leaves and then into tryptic peptides derived from newly synthesized proteins. Using information on the rate of growth of barley leaves combined with the rate of degradation of (14)N-labeled proteins, we calculate the turnover rates of 508 different proteins in barley and show that they vary by more than 100-fold. There was approximately a 9-h lag from label application until (15)N incorporation could be reliably quantified in extracted peptides. Using this information and assuming constant translation rates for proteins during the time course, we were able to quantify degradation rates for several proteins that exhibit half-lives on the order of hours. Our workflow, involving a stringent series of mass spectrometry filtering steps, demonstrates that (15)N labeling can be used for large-scale liquid chromatography-mass spectrometry studies of protein turnover in plants. We identify a series of abundant proteins in photosynthesis, photorespiration, and specific subunits of chlorophyll biosynthesis that turn over significantly more rapidly than the average protein involved in these processes. We also highlight a series of proteins that turn over as rapidly as the well-known D1 subunit of photosystem II. While these proteins need further verification for rapid degradation in vivo, they cluster in chlorophyll and thiamine biosynthesis.
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Affiliation(s)
- Clark J Nelson
- Australian Research Council Centre of Excellence in Plant Energy Biology and Centre for Comparative Analysis of Biomolecular Networks, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Ralitza Alexova
- Australian Research Council Centre of Excellence in Plant Energy Biology and Centre for Comparative Analysis of Biomolecular Networks, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Richard P Jacoby
- Australian Research Council Centre of Excellence in Plant Energy Biology and Centre for Comparative Analysis of Biomolecular Networks, University of Western Australia, Perth, Western Australia 6009, Australia
| | - A Harvey Millar
- Australian Research Council Centre of Excellence in Plant Energy Biology and Centre for Comparative Analysis of Biomolecular Networks, University of Western Australia, Perth, Western Australia 6009, Australia
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Li J, Pandeya D, Jo YD, Liu WY, Kang BC. Reduced activity of ATP synthase in mitochondria causes cytoplasmic male sterility in chili pepper. PLANTA 2013; 237:1097-109. [PMID: 23274393 DOI: 10.1007/s00425-012-1824-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 11/22/2012] [Indexed: 05/05/2023]
Abstract
Cytoplasmic male sterility (CMS) is a maternally inherited trait characterized by the inability to produce functional pollen. The CMS-associated protein Orf507 (reported as Orf456 in previous researches) was previously identified as a candidate gene for mediating male sterility in pepper. Here, we performed yeast two-hybrid analysis to screen for interacting proteins, and found that the ATP synthase 6 kDa subunit containing a mitochondrial signal peptide (MtATP6) specifically interacted with Orf507. In addition, the two proteins were found to be interacted in vivo using bimolecular fluorescence complementation (BiFC) and co-immunoprecipitation (Co-IP) assays. Further functional characterization of Orf507 revealed that the encoded protein is toxic to bacterial cells. Analysis of tissue-specific expression of ATP synthase 6 kDa showed that the transcription level was much lower in anthers of the CMS line than in their wild type counterparts. In CMS plants, ATP synthase activity and content were reduced by more than half compared to that of the normal plants. Taken together, it can be concluded that reduced ATP synthase activity and ATP content might have affected pollen development in CMS plants. Here, we hypothesize that Orf507 might cause MtATP6 to be nonfunctional by changing the latter's conformation or producing an inhibitor that prevents the normal functioning of MtATP6. Thus, further functional analysis of mitochondrial Orf507 will provide insights into the mechanisms underlying CMS in plants.
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Affiliation(s)
- Jinjie Li
- Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute of Agriculture and Life Sciences, College of Agricultural Sciences, Seoul National University, Seoul, Republic of Korea
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Behrens C, Hartmann K, Sunderhaus S, Braun HP, Eubel H. Approximate calculation and experimental derivation of native isoelectric points of membrane protein complexes of Arabidopsis chloroplasts and mitochondria. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013. [DOI: 10.1016/j.bbamem.2012.11.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Li L, Carrie C, Nelson C, Whelan J, Millar AH. Accumulation of newly synthesized F1 in vivo in arabidopsis mitochondria provides evidence for modular assembly of the plant F1Fo ATP synthase. J Biol Chem 2012; 287:25749-57. [PMID: 22674576 DOI: 10.1074/jbc.m112.373506] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
F(1) subcomplex in mitochondrial samples is often considered to be a breakage product of the F(1)F(O) ATP synthase during sample handling and electrophoresis. We have used a progressive (15)N incorporation strategy to investigate the plant F(1)F(O) ATP synthase assembly model and the apparently free F(1) in plant mitochondria which is found in both the inner membrane and matrix. We show that subunits within F(1) in the inner membrane and matrix had a relatively higher (15)N incorporation rate than corresponding subunits in intact membrane F(1)F(O). This demonstrates that free F(1) was a newer pool with a faster turnover rate consistent with it being an assembly intermediate in vivo. Import of [(35)S]Met-labeled F(1) subunit precursors into Arabidopsis mitochondria showed the rapid accumulation of F(1) assembly intermediates. The different (15)N incorporation rate in matrix F(1), inner membrane F(1) and intact F(1)F(O) demonstrates these three represent different protein populations and are likely step by step intermediates during the assembly process of plant mitochondrial ATP synthase. The potential biological implications of in vivo accumulation of enzymatically active F(1) in mitochondria are discussed.
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Affiliation(s)
- Lei Li
- ARC Centre of Excellence in Plant Energy Biology, The University of Western Australia, Crawley WA 6009, Western Australia, Australia
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Lawlor DW, Tezara W. Causes of decreased photosynthetic rate and metabolic capacity in water-deficient leaf cells: a critical evaluation of mechanisms and integration of processes. ANNALS OF BOTANY 2009; 103:561-79. [PMID: 19155221 PMCID: PMC2707350 DOI: 10.1093/aob/mcn244] [Citation(s) in RCA: 290] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 08/27/2008] [Accepted: 11/10/2008] [Indexed: 05/18/2023]
Abstract
BACKGROUND Water deficit (WD) decreases photosynthetic rate (A) via decreased stomatal conductance to CO(2) (g(s)) and photosynthetic metabolic potential (A(pot)). The relative importance of g(s) and A(pot), and how they are affected by WD, are reviewed with respect to light intensity and to experimental approaches. SCOPE AND CONCLUSIONS With progressive WD, A decreases as g(s) falls. Under low light during growth and WD, A is stimulated by elevated CO(2), showing that metabolism (A(pot)) is not impaired, but at high light A is not stimulated, showing inhibition. At a given intercellular CO(2) concentration (C(i)) A decreases, showing impaired metabolism (A(pot)). The C(i) and probably chloroplast CO(2) concentration (C(c)), decreases and then increases, together with the equilibrium CO(2) concentration, with greater WD. Estimation of C(c) and internal (mesophyll) conductance (g(i)) is considered uncertain. Photosystem activity is unaffected until very severe WD, maintaining electron (e(-)) transport (ET) and reductant content. Low A, together with photorespiration (PR), which is maintained or decreased, provides a smaller sink for e(-)(,) causing over-energization of energy transduction. Despite increased non-photochemical quenching (NPQ), excess energy and e(-) result in generation of reactive oxygen species (ROS). Evidence is considered that ROS damages ATP synthase so that ATP content decreases progressively with WD. Decreased ATP limits RuBP production by the Calvin cycle and thus A(pot). Rubisco activity is unlikely to determine A(pot). Sucrose synthesis is limited by lack of substrate and impaired enzyme regulation. With WD, PR decreases relative to light respiration (R(L)), and mitochondria consume reductant and synthesise ATP. With progressing WD at low A, R(L) increases C(i) and C(c). This review emphasises the effects of light intensity, considers techniques, and develops a qualitative model of photosynthetic metabolism under WD that explains many observations: testable hypotheses are suggested.
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Affiliation(s)
- David W Lawlor
- Plant Sciences, Centre for Crop Improvement, Rothamsted Research, Harpenden, Herts, UK.
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Millar AH, Liddell A, Leaver CJ. Isolation and Subfractionation of Mitochondria from Plants. Methods Cell Biol 2007; 80:65-90. [PMID: 17445689 DOI: 10.1016/s0091-679x(06)80003-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- A H Millar
- ARC Centre of Excellence in Plant Energy Biology The University of Western Australia, Crawley 6009, Western Australia, Australia
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Zhang X, Takano T, Liu S. Identification of a mitochondrial ATP synthase small subunit gene (RMtATP6) expressed in response to salts and osmotic stresses in rice (Oryza sativa L.). JOURNAL OF EXPERIMENTAL BOTANY 2005; 57:193-200. [PMID: 16317034 DOI: 10.1093/jxb/erj025] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Large areas of northern China have alkaline soil due to the accumulation of sodium carbonates (NaHCO3, Na2CO3). To understand better how plants can tolerate alkaline soil, a cDNA library was prepared from rice (Oryza sativa L.) roots grown in the presence of NaHCO3 stress. A cDNA clone isolated from this library was identified by a homology search as a mitochondrial ATP synthase 6 kDa subunit gene (RMtATP6; GenBank accession nos AB055076, BAB21526). In transformed yeast and tobacco protoplasts, the RMtATP6 protein was localized in mitochondria using the green fluorescent protein (GFP) marker. Analysis of RMtATP6 mRNA levels suggested that the expression of this gene was induced by stress from sodium carbonates and other sodium salts. Transgenic tobacco overexpressing the RMtATP6 gene had greater tolerance to salt stress at the seedling stage than untransformed tobacco. Among the other genes for F1F0-ATPase of rice, some were found to be up-regulated by some environmental stresses and some were not. These data suggest that the RMtATP6 protein acts as a subunit of ATP synthase, and is expressed in response to stress from several salts, with the other genes coding for the subunits of the same ATP-synthase.
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Affiliation(s)
- Xinxin Zhang
- Alkali Soil Natural Environmental Science Center (ASNESC), Stress Molecular Biology Laboratory, Northeast Forestry University, Harbin 150040, PR China
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Liu S, Zhang X. Expression and purification of a novel rice (Oryza sativa L.) mitochondrial ATP synthase small subunit in Escherichia coli. Protein Expr Purif 2004; 37:306-10. [PMID: 15358351 DOI: 10.1016/j.pep.2004.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2004] [Revised: 06/04/2004] [Indexed: 11/19/2022]
Abstract
To clarify the function of the rice mitochondrial ATP synthase 6 kDa subunit (RMtATP6), a method of producing large quantities of this protein is needed. Here, we describe an Escherichia coli expression system for the rapid and economic expression of RMtATP6. The RMtATP6 gene (GenBank Accession No. ) was cloned into the pGEX-6p-3 vector to allow expression of RMtATP6 as a glutathione S-transferase (GST) fusion protein. The RMtATP6-GST fusion protein was purified by affinity chromatography using a glutathione-Sepharose 4B column. A Western blot analysis using anti-GST antibody showed that the fusion protein was not degraded. After enzymatic cleavage of the GST tail, the RMtATP6 protein showed a molecular weight of around 6 kDa. The predicted pI of this protein is 10.01. After improving the conditions of expression and the purification procedures, the final yield of the entire expression and purification process was about 4.6 mg of pure RMtATP6 protein per liter of bacterial culture.
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Affiliation(s)
- Shenkui Liu
- Stress Molecular Biology Laboratory, Alkali Soil Natural Environmental Science Center (ASNESC), The Northeast Forestry University, Harbin, 150040, People's Republic of China.
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Millar AH, Eubel H, Jänsch L, Kruft V, Heazlewood JL, Braun HP. Mitochondrial cytochrome c oxidase and succinate dehydrogenase complexes contain plant specific subunits. PLANT MOLECULAR BIOLOGY 2004; 56:77-90. [PMID: 15604729 DOI: 10.1007/s11103-004-2316-2] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Respiratory oxidative phosphorylation represents a central functionality in plant metabolism, but the subunit composition of the respiratory complexes in plants is still being defined. Most notably, complex II (succinate dehydrogenase) and complex IV (cytochrome c oxidase) are the least defined in plant mitochondria. Using Arabidopsis mitochondrial samples and 2D Blue-native/SDS-PAGE, we have separated complex II and IV from each other and displayed their individual subunits for analysis by tandem mass spectrometry and Edman sequencing. Complex II can be discretely separated from other complexes on Blue-native gels and consists of eight protein bands. It contains the four classical SDH subunits as well as four subunits unknown in mitochondria from other eukaryotes. Five of these proteins have previously been identified, while three are newly identified in this study. Complex IV consists of 9-10 protein bands, however, it is more diffuse in Blue-native gels and co-migrates in part with the translocase of the outer membrane (TOM) complex. Differential analysis of TOM and complex IV reveals that complex IV probably contains eight subunits with similarity to known complex IV subunits from other eukaryotes and a further six putative subunits which all represent proteins of unknown function in Arabidopsis . Comparison of the Arabidopsis data with Blue-native/SDS-PAGE separation of potato and bean mitochondria confirmed the protein band complexity of these two respiratory complexes in plants. Two-dimensional Blue-native/Blue-native PAGE, using digitonin followed by dodecylmaltoside in successive dimensions, separated a diffusely staining complex containing both TOM and complex IV. This suggests that the very similar mass of these complexes will likely prevent high purity separations based on size. The documented roles of several of the putative complex IV subunits in hypoxia response and ozone stress, and similarity between new complex II subunits and recently identified plant specific subunits of complex I, suggest novel biological insights can be gained from respiratory complex composition analysis.
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Affiliation(s)
- A Harvey Millar
- Plant Molecular Biology Group, School of Biomedical and Chemical Sciences, University of Western Australia, Crawley, Western Australia 6009, Australia
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Burger G, Lang BF, Braun HP, Marx S. The enigmatic mitochondrial ORF ymf39 codes for ATP synthase chain b. Nucleic Acids Res 2003; 31:2353-60. [PMID: 12711680 PMCID: PMC154212 DOI: 10.1093/nar/gkg326] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2003] [Revised: 02/13/2003] [Accepted: 02/25/2003] [Indexed: 11/12/2022] Open
Abstract
ymf39 is a conserved hypothetical protein-coding gene found in mitochondrial genomes of land plants and certain protists. We speculated earlier, based on a weak sequence similarity between Ymf39 from a green alga and the atpF gene product from Bradyrhizobium, that ymf39 might code for subunit b of mitochondrial F(0)F(1)-ATP synthase. To test this hypothesis, we have sequenced ymf39 from five protists with minimally derived mitochondrial genomes, the jakobids. In addition, we isolated the mitochondrial ATP synthase complex of the jakobid Seculamonas ecuadoriensis and determined the partial protein sequence of the 19-kDa subunit, the size expected for Ymf39. The obtained peptide sequence matches perfectly with a 3'-proximal region of the ymf39 gene of this organism, confirming that Ymf39 is indeed an ATP synthase subunit. Finally, we employed statistical tests to assess the significance of sequence similarity of Ymf39 proteins with each other, their nucleus-encoded functional counterparts, ATP4/ATP5F, from fungi and animals and alpha-proteobacterial ATP synthase b-subunits. This analysis provides clear evidence that ymf39 is an atpF homolog, while ATP4/ATP5F appears to be a highly diverged form of ymf39 that has migrated to the nucleus. We propose to designate ymf39 from now on atp4.
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Affiliation(s)
- Gertraud Burger
- Canadian Institute for Advanced Research, Département de Biochimie, Université de Montréal, 2900 Boulevard Edouard Montpetit, Montréal, Québec H3T 1J4, Canada
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Heazlewood JL, Whelan J, Millar AH. The products of the mitochondrial orf25 and orfB genes are FO components in the plant F1FO ATP synthase. FEBS Lett 2003; 540:201-5. [PMID: 12681508 DOI: 10.1016/s0014-5793(03)00264-3] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The F(O) portion of the mitochondrial ATP synthase contains a range of different subunits in bacteria, yeast and mammals. A search of the Arabidopsis genome identified sequence orthologs for only some of these subunits. Blue native polyacrylamide gel electrophoresis separation of Arabidopsis mitochondrial respiratory chain complexes revealed intact F(1)F(O), and separated F(1) and F(O) components. The subunits of each complex were analysed by mass spectrometry and matched to Arabidopsis genes. In the F(1)F(O) complex a series of nine known subunits were identified along with two additional proteins matching the predicted products of the mitochondrial encoded orfB and orf25 genes. The F(1) complex contained the five well-characterised F(1) subunits, while four subunits in the F(O) complex were identified: subunit 9, d subunit, and the orfB and orf25 products. Previously, orfB has been suggested as the plant equivalent of subunit 8 based on structural and sequence similarity. We propose that orf25 is the plant b subunit based on structural similarity and its presence in the F(O) complex. Chimerics of orf25, orfB, subunit 9 and subunit 6 have been associated with cytoplasmic male sterility in a variety of plant species, our additional findings now place all these proteins in the same protein complex.
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Affiliation(s)
- J L Heazlewood
- Plant Molecular Biology Group, School of Biomedical and Chemical Sciences, The University of Western Australia, Crawley 6009, WA, Australia
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15
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Epstein CB, Hale W, Butow RA. Numerical methods for handling uncertainty in microarray data: an example analyzing perturbed mitochondrial function in yeast. Methods Cell Biol 2002; 65:439-52. [PMID: 11381609 DOI: 10.1016/s0091-679x(01)65026-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- C B Epstein
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
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Affiliation(s)
- A H Millar
- Department of Plant Sciences, University of Oxford, Oxford, OX1 3RB, United Kingdom
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Murcha MW, Huang T, Whelan J. Import of precursor proteins into mitochondria from soybean tissues during development. FEBS Lett 1999; 464:53-9. [PMID: 10611482 DOI: 10.1016/s0014-5793(99)01674-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Characterisation of the amount of protein import of the alternative oxidase (AOX) and the F(A)d precursor proteins (previously shown to use different import pathways) into mitochondria from developing soybean tissues indicated that they displayed different patterns. Import of the AOX declined in both cotyledon and root mitochondria with increasing age, whereas the import of the F(A)d into cotyledon mitochondria remained high throughout the same period. Using primary leaf mitochondria, it was evident that import of AOX remained high while it declined in cotyledon and root mitochondria. The amount of import of the AOX into mitochondria from different tissues closely matched the amount of the Tom 20 receptor.
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Affiliation(s)
- M W Murcha
- Department of Biochemistry, University of Western Australia, Nedlands 6907, Perth, W.A., Australia
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Struglics A, Fredlund KM, Møller IM, Allen JF. Two subunits of the F0F1-ATPase are phosphorylated in the inner mitochondrial membrane. Biochem Biophys Res Commun 1998; 243:664-8. [PMID: 9500982 DOI: 10.1006/bbrc.1998.8151] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Inside-out submitochondrial particles from potato tuber mitochondria were incubated with [gamma-32P]ATP. More than 16 phosphorylated polypeptides were detected by autoradiography on an SDS-gel. Two phosphoproteins, migrating at 22 and 28 kDa, were excised from the SDS-gel, electroeluted, and purified further by anion chromatography. The phosphoproteins were N-terminally sequenced. Over the regions sequenced, the 22 and 28 kDa phosphoproteins had 100% sequence identity with potato proteins identified as the delta'-subunit of the F1-ATPase and the b-subunit of the F0-ATPase, respectively. We suggest that phosphorylation of these proteins may control the interaction between F1 and F0 and regulate energy coupling in oxidative phosphorylation.
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Abstract
The structure of the core catalytic unit of ATP synthase, alpha 3 beta 3 gamma, has been determined by X-ray crystallography, revealing a roughly symmetrical arrangement of alternating alpha and beta subunits around a central cavity in which helical portions of gamma are found. A low-resolution structural model of F0, based on electron spectroscopic imaging, locates subunit a and the two copies of subunit b outside of a subunit c oligomer. The structures of individual subunits epsilon and c (largely) have been solved by NMR spectroscopy, but the oligomeric structure of c is still unknown. The structures of subunits a and delta remain undefined, that of b has not yet been defined but biochemical evidence indicates a credible model. Subunits gamma, epsilon, b, and delta are at the interface between F1 and F0; gamma epsilon complex forms one element of the stalk, interacting with c at the base and alpha and beta at the top. The locations of b and delta are less clear. Elucidation of the structure F0, of the stalk, and of the entire F1F0 remains a challenging goal.
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Affiliation(s)
- J Weber
- Department of Biochemistry, University of Rochester Medical Center, NY 14642, USA
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20
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Itoh A, Sekiya J. Tissue specificity of mitochondrial F0F1-ATPase activity of Lilium longiflorum plant. FEBS Lett 1994; 356:229-32. [PMID: 7805844 DOI: 10.1016/0014-5793(94)01269-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A large difference was found in the activities of oligomycin-sensitive mitochondrial F0F1-ATPase isolated from different tissues of Lilium longiflorum plants. The enzyme activity of F0F1-ATPase in pollen was the highest, while that in bulbs was the lowest. When ATPases were cross-reconstituted from F1-ATPases and F1-depleted submitochondrial particles (SMP), ATPases reconstituted from F1-depleted pollen SMP showed the higher activity regardless of the source of F1-ATPase. Fatty acid compositions of phospholipids in SMP were also different between bulbs and pollen. These suggest that the F0 portion and/or its environment are important for regulation of F0F1-ATPase activity in L. longiflorum plant.
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Affiliation(s)
- A Itoh
- Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, Japan
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21
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Deisinger B, Nawroth T, Zwicker K, Matuschka S, John G, Zimmer G, Freisleben HJ. Purification of ATP synthase from beef heart mitochondria (F0F1) and co-reconstitution with monomeric bacteriorhodopsin into liposomes capable of light-driven ATP synthesis. EUROPEAN JOURNAL OF BIOCHEMISTRY 1993; 218:377-83. [PMID: 8269926 DOI: 10.1111/j.1432-1033.1993.tb18387.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
ATP synthase was isolated from beef heart mitochondria by extraction with N,N-bis-(3-D-gluconamidopropyl)deoxycholamide or by traditional cholate extraction. The enzyme was purified subsequently by ion-exchange and gel-permeation chromatographies in the presence of glycerol and the protease inhibitor diisopropylfluorophosphate. The ATP synthase consisted of 12-14 subunits and contained three tightly bound nucleotides. The co-reconstitution of crude or purified ATP synthase with monomeric bacteriorhodopsin by the method of detergent incubation of liposomes yielded proteoliposomes capable of light-driven ATP synthesis, as detected with a luciferase system for at least 30 min. The reaction was suppressed by the inhibitors oligomycin (> 90%) and dicyclohexylcarbodiimide (85%) and by the uncoupler carbonylcyanide-p-trifluormethoxyphenylhydrazone (> 95%). The purified ATP synthase was apparently free of cytochrome impurities and of adenylate kinase activity, i.e. the enzyme exhibited light-driven ATP synthesis without the dark reaction. For the first time, this is demonstrated with purified ATP synthase from beef heart mitochondria.
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Affiliation(s)
- B Deisinger
- Gustav-Embden-Zentrum der Biologischen Chemie, Klinikum der J. W. Goethe-Universität, Frankfurt/M., Germany
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22
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Braun HP, Schmitz UK. Purification and sequencing of cytochrome b from potato reveals methionine cleavage of a mitochondrially encoded protein. FEBS Lett 1993; 316:128-32. [PMID: 8420797 DOI: 10.1016/0014-5793(93)81200-j] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Several mitochondrial genes from a large number of different fungi, mammals and plants have been sequenced but little is known about the corresponding translation products. We have affinity purified cytochrome c reductase from potato mitochondria and isolated the mitochondrially encoded cytochrome b protein. Amino-terminal sequencing reveals that the polypeptide does not start with a methionine. Comparison of the amino acid sequence with the recently published sequence of the gene encoding the cytochrome b apoprotein suggests that the N-formylmethionine is removed. This result provides the first evidence for the presence of a deformylase and a methionine aminopeptidase in mitochondria.
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Affiliation(s)
- H P Braun
- Institut für Genbiologische Forschung Berlin GmbH, Berlin, Germany
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