1
|
Zannini F, Herrmann JM, Couturier J, Rouhier N. Oxidation of Arabidopsis thaliana COX19 Using the Combined Action of ERV1 and Glutathione. Antioxidants (Basel) 2023; 12:1949. [PMID: 38001802 PMCID: PMC10669224 DOI: 10.3390/antiox12111949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 10/26/2023] [Accepted: 10/30/2023] [Indexed: 11/26/2023] Open
Abstract
Protein import and oxidative folding within the intermembrane space (IMS) of mitochondria relies on the MIA40-ERV1 couple. The MIA40 oxidoreductase usually performs substrate recognition and oxidation and is then regenerated by the FAD-dependent oxidase ERV1. In most eukaryotes, both proteins are essential; however, MIA40 is dispensable in Arabidopsis thaliana. Previous complementation experiments have studied yeast mia40 mutants expressing a redox inactive, but import-competent versions of yeast Mia40 using A. thaliana ERV1 (AtERV1) suggest that AtERV1 catalyzes the oxidation of MIA40 substrates. We assessed the ability of both yeast and Arabidopsis MIA40 and ERV1 recombinant proteins to oxidize the apo-cytochrome reductase CCMH and the cytochrome c oxidase assembly protein COX19, a typical MIA40 substrate, in the presence or absence of glutathione, using in vitro cysteine alkylation and cytochrome c reduction assays. The presence of glutathione used at a physiological concentration and redox potential was sufficient to support the oxidation of COX19 by AtERV1, providing a likely explanation for why MIA40 is not essential for the import and oxidative folding of IMS-located proteins in Arabidopsis. The results point to fundamental biochemical differences between Arabidopsis and yeast ERV1 in catalyzing protein oxidation.
Collapse
Affiliation(s)
- Flavien Zannini
- Université de Lorraine, INRAE, IAM, F-54000 Nancy, France; (F.Z.); (J.C.)
| | - Johannes M. Herrmann
- Cell Biology, University of Kaiserslautern, RPTU, 67663 Kaiserslautern, Germany;
| | - Jérémy Couturier
- Université de Lorraine, INRAE, IAM, F-54000 Nancy, France; (F.Z.); (J.C.)
| | - Nicolas Rouhier
- Université de Lorraine, INRAE, IAM, F-54000 Nancy, France; (F.Z.); (J.C.)
| |
Collapse
|
2
|
Sajib SA, Grübler B, Oukacine C, Delannoy E, Courtois F, Mauve C, Lurin C, Gakière B, Pfannschmidt T, Merendino L. Limiting etioplast gene expression induces apical hook twisting during skotomorphogenesis of Arabidopsis seedlings. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 114:293-309. [PMID: 36748183 DOI: 10.1111/tpj.16134] [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: 04/20/2022] [Revised: 01/20/2023] [Accepted: 02/01/2023] [Indexed: 05/10/2023]
Abstract
When covered by a layer of soil, seedling development follows a dark-specific program (skotomorphogenesis). In the dark, seedlings consist of small, non-green cotyledons, a long hypocotyl, and an apical hook to protect meristematic cells. We recently highlighted the role played by mitochondria in the high energy-consuming reprogramming of Arabidopsis skotomorphogenesis. Here, the role played by plastids, another energy-supplying organelle, in skotomorphogenesis is investigated. This study was conducted in dark conditions to exclude light signals so as to better focus on those produced by plastids. It was found that limitation of plastid gene expression (PGE) induced an exaggerated apical hook bending. Inhibition of PGE was obtained at the levels of transcription and translation using the antibiotics rifampicin (RIF) and spectinomycin, respectively, as well as plastid RPOTp RNA polymerase mutants. RIF-treated seedlings also showed expression induction of marker nuclear genes for mitochondrial stress, perturbation of mitochondrial metabolism, increased ROS levels, and an augmented capacity of oxygen consumption by mitochondrial alternative oxidases (AOXs). AOXs act to prevent overreduction of the mitochondrial electron transport chain. Previously, we reported that AOX1A, the main AOX isoform, is a key component in the developmental response to mitochondrial respiration deficiency. In this work, we suggest the involvement of AOX1A in the response to PGE dysfunction and propose the importance of signaling between plastids and mitochondria. Finally, it was found that seedling architecture reprogramming in response to RIF was independent of canonical organelle retrograde pathways and the ethylene signaling pathway.
Collapse
Affiliation(s)
- Salek Ahmed Sajib
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Björn Grübler
- University of Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000, Grenoble, France
| | - Cylia Oukacine
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Etienne Delannoy
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Florence Courtois
- University of Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000, Grenoble, France
| | - Caroline Mauve
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Claire Lurin
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Bertrand Gakière
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| | - Thomas Pfannschmidt
- Institut for Botany, Plant Physiology, Leibniz University Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Livia Merendino
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université Evry, 91190, Gif sur Yvette, France
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Cité, CNRS, INRAE, 91190, Gif sur Yvette, France
| |
Collapse
|
3
|
Kataya A, Mitchell S, Etman R, Samuel M, Moorhead GB. Peroxisomal protein phosphatase PP2A-B' theta interacts with and piggybacks SINA-like 10 E3 ligase into peroxisomes. Biochem Biophys Res Commun 2023; 644:34-39. [PMID: 36623396 DOI: 10.1016/j.bbrc.2022.12.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 12/30/2022] [Indexed: 01/02/2023]
Abstract
Protein phosphatase 2A (PP2A) is targeted to the plant peroxisome via a C-terminal SSL sequence on its regulatory B' theta (θ) subunit. To date the substrates of peroxisomal PP2A are unknown but are thought to be recruited by the regulatory B'θ subunit. Employing yeast two hybrid screening, we have identified Arabidopsis E3 ligase SINA-like 10 as a B'θ binding partner. The E3 ligase SINA-like 10 was found to harbor the PP2A B'-binding Short Linear interaction Motif or SLiM, LxxIxE. This interaction was further verified both in vitro and in vivo using direct pulldown assays and bimolecular fluorescence complementation. Utilizing peroxisomal targeted and a cytosolic version of B'θ (lacking its C-terminal peroxisomal targeting sequence SSL>) bimolecular fluorescence complementation suggests an interaction to occur in the cytosol followed by piggybacking E3 ligase SINA-like 10 into peroxisomes. These results identify a first peroxisomal PP2A interactor, which also obtains a PP2A B'-binding SLiM.
Collapse
Affiliation(s)
- Amr Kataya
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada; Department of Chemistry, Bioscience, and Environmental Engineering, University of Stavanger, Stavanger, Norway.
| | - Sierra Mitchell
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Rasha Etman
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Marcus Samuel
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Greg B Moorhead
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada.
| |
Collapse
|
4
|
Toxoplasma Shelph, a Phosphatase Located in the Parasite Endoplasmic Reticulum, Is Required for Parasite Virulence. mSphere 2022; 7:e0035022. [PMID: 36326242 PMCID: PMC9769683 DOI: 10.1128/msphere.00350-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Toxoplasma gondii is a single-celled parasitic eukaryote that evolved to successfully propagate in any nucleated cell. As with any other eukaryote, its life cycle is regulated by signaling pathways controlled by kinases and phosphatases. T. gondii encodes an atypical bacterial-like phosphatase absent from mammalian genomes, named Shelph, after its first identification in the psychrophilic bacterium Schewanella sp. Here, we demonstrate that Toxoplasma Shelph is an active phosphatase localized in the parasite endoplasmic reticulum. The phenotyping of a shelph knockout (KO) line showed a minor impairment in invasion on human fibroblasts, while the other steps of the parasite lytic cycle were not affected. In contrast with Plasmodium ortholog Shelph1, this invasion deficiency was not correlated with any default in the biogenesis of secretory organelles. However, Shelph-KO parasites displayed a much-pronounced defect in virulence in vivo. These phenotypes could be rescued by genetic complementation, thus supporting an important function for Shelph in the context of a natural infection. IMPORTANCE Toxoplasma gondii belongs to the Apicomplexa phylum, which comprises more than 5,000 species, among which is Plasmodium falciparum, the notorious agent of human malaria. Intriguingly, the Apicomplexa genomes encode at least one phosphatase closely related to the bacterial Schewanella phosphatase, or Shelph. To better understand the importance of these atypical bacterial enzymes in eukaryotic parasites, we undertook the functional characterization of T. gondii Shelph. Our results uncovered its subcellular localization and its enzymatic activity, revealed its subtle involvement during the tachyzoite invasion step of the lytic cycle, and more importantly, highlighted a critical requirement of this phosphatase for parasite propagation in mice. Overall, this study revealed an unexpected role for T. gondii Shelph in the maintenance of parasite virulence in vivo.
Collapse
|
5
|
Kataya A, Gautam N, Jamshed M, Muench DG, Samuel MA, Thelen JJ, Moorhead GB. Identification of Arabidopsis Protein Kinases That Harbor Functional Type 1 Peroxisomal Targeting Signals. Front Cell Dev Biol 2022; 10:745883. [PMID: 35242755 PMCID: PMC8886021 DOI: 10.3389/fcell.2022.745883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 01/25/2022] [Indexed: 12/25/2022] Open
Abstract
Peroxisomes are eukaryotic specific organelles that perform diverse metabolic functions including fatty acid β-oxidation, reactive species metabolism, photorespiration, and responses to stress. However, the potential regulation of these functions by post-translational modifications, including protein phosphorylation, has had limited study. Recently, we identified and catalogued a large number of peroxisomal phosphorylated proteins, implicating the presence of protein kinases in this organelle. Here, we employed available prediction models coupled with sequence conservation analysis to identify 31 protein kinases from the Arabidopsis kinome (all protein kinases) that contain a putative, non-canonical peroxisomal targeting signal type 1 (PTS1). From this, twelve C-terminal domain-PTS1s were demonstrated to be functional in vivo, targeting enhanced yellow fluorescent protein to peroxisomes, increasing the list of presumptive peroxisomal protein kinases to nineteen. Of the twelve protein kinases with functional PTS1s, we obtained full length clones for eight and demonstrated that seven target to peroxisomes in vivo. Screening homozygous mutants of the presumptive nineteen protein kinases revealed one candidate (GPK1) that harbors a sugar-dependence phenotype, suggesting it is involved in regulating peroxisomal fatty acid β-oxidation. These results present new opportunities for investigating the regulation of peroxisome functions.
Collapse
Affiliation(s)
- Amr Kataya
- Department of Chemistry, Bioscience, and Environmental Engineering, University of Stavanger, Stavanger, Norway.,Department of Biological Sciences, University of Calgary, Calgary, AB, Canada.,Christopher S. Bond Life Sciences Center, Department of Biochemistry, University of Missouri, Columbia, MO, United States
| | - Nitija Gautam
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Muhammad Jamshed
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Douglas G Muench
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Marcus A Samuel
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Jay J Thelen
- Christopher S. Bond Life Sciences Center, Department of Biochemistry, University of Missouri, Columbia, MO, United States
| | - Greg B Moorhead
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| |
Collapse
|
6
|
Welchen E, Canal MV, Gras DE, Gonzalez DH. Cross-talk between mitochondrial function, growth, and stress signalling pathways in plants. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:4102-4118. [PMID: 33369668 DOI: 10.1093/jxb/eraa608] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/22/2020] [Indexed: 05/16/2023]
Abstract
Plant mitochondria harbour complex metabolic routes that are interconnected with those of other cell compartments, and changes in mitochondrial function remotely influence processes in different parts of the cell. This implies the existence of signals that convey information about mitochondrial function to the rest of the cell. Increasing evidence indicates that metabolic and redox signals are important for this process, but changes in ion fluxes, protein relocalization, and physical contacts with other organelles are probably also involved. Besides possible direct effects of these signalling molecules on cellular functions, changes in mitochondrial physiology also affect the activity of different signalling pathways that modulate plant growth and stress responses. As a consequence, mitochondria influence the responses to internal and external factors that modify the activity of these pathways and associated biological processes. Acting through the activity of hormonal signalling pathways, mitochondria may also exert remote control over distant organs or plant tissues. In addition, an intimate cross-talk of mitochondria with energy signalling pathways, such as those represented by TARGET OF RAPAMYCIN and SUCROSE NON-FERMENTING1-RELATED PROTEIN KINASE 1, can be envisaged. This review discusses available evidence on the role of mitochondria in shaping plant growth and stress responses through various signalling pathways.
Collapse
Affiliation(s)
- 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
| | - María Victoria Canal
- 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
| |
Collapse
|
7
|
Yu F, Li M, He D, Yang P. Advances on Post-translational Modifications Involved in Seed Germination. FRONTIERS IN PLANT SCIENCE 2021; 12:642979. [PMID: 33828574 PMCID: PMC8020409 DOI: 10.3389/fpls.2021.642979] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 02/16/2021] [Indexed: 05/05/2023]
Abstract
Seed germination and subsequent seedling establishment are important developmental processes that undergo extremely complex changes of physiological status and are precisely regulated at transcriptional and translational levels. Phytohormones including abscisic acid (ABA) and gibberellin (GA) are the critical signaling molecules that modulate the alteration from relative quiescent to a highly active state in seeds. Transcription factors such as ABA insensitive5 (ABI5) and DELLA domain-containing proteins play the central roles in response to ABA and GA, respectively, which antagonize each other during seed germination. Recent investigations have demonstrated that the regulations at translational and post-translational levels, especially post-translational modifications (PTMs), play a decisive role in seed germination. Specifically, phosphorylation and ubiquitination were shown to be involved in regulating the function of ABI5. In this review, we summarized the latest advancement on the function of PTMs involved in the regulation of seed germination, in which the PTMs for ABI5- and DELLA-containing proteins play the key roles. Meanwhile, the studies on PTM-based proteomics during seed germination and the crosstalk of different PTMs are also discussed. Hopefully, it will facilitate in obtaining a comprehensive understanding of the physiological functions of different PTMs in seed germination.
Collapse
|
8
|
Bheri M, Mahiwal S, Sanyal SK, Pandey GK. Plant protein phosphatases: What do we know about their mechanism of action? FEBS J 2020; 288:756-785. [PMID: 32542989 DOI: 10.1111/febs.15454] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 05/27/2020] [Accepted: 06/09/2020] [Indexed: 12/30/2022]
Abstract
Protein phosphorylation is a major reversible post-translational modification. Protein phosphatases function as 'critical regulators' in signaling networks through dephosphorylation of proteins, which have been phosphorylated by protein kinases. A large understanding of their working has been sourced from animal systems rather than the plant or the prokaryotic systems. The eukaryotic protein phosphatases include phosphoprotein phosphatases (PPP), metallo-dependent protein phosphatases (PPM), protein tyrosine (Tyr) phosphatases (PTP), and aspartate (Asp)-dependent phosphatases. The PPP and PPM families are serine(Ser)/threonine(Thr)-specific phosphatases (STPs), while PTP family is Tyr specific. Dual-specificity phosphatases (DsPTPs/DSPs) dephosphorylate Ser, Thr, and Tyr residues. PTPs lack sequence homology with STPs, indicating a difference in catalytic mechanisms, while the PPP and PPM families share a similar structural fold indicating a common catalytic mechanism. The catalytic cysteine (Cys) residue in the conserved HCX5 R active site motif of the PTPs acts as a nucleophile during hydrolysis. The PPP members require metal ions, which coordinate the phosphate group of the substrate, followed by a nucleophilic attack by a water molecule and hydrolysis. The variable holoenzyme assembly of protein phosphatase(s) and the overlap with other post-translational modifications like acetylation and ubiquitination add to their complexity. Though their functional characterization is extensively reported in plants, the mechanistic nature of their action is still being explored by researchers. In this review, we exclusively overview the plant protein phosphatases with an emphasis on their mechanistic action as well as structural characteristics.
Collapse
Affiliation(s)
- Malathi Bheri
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, India
| | - Swati Mahiwal
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, India
| | - Sibaji K Sanyal
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, India
| | - Girdhar K Pandey
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, India
| |
Collapse
|
9
|
Templeton GW, Johnson JJ, Sieben NA, Moorhead GB. GL2 EXPRESSION MODULATOR, a plant specific protein phosphatase one interactor that binds phosphoinositides. Biochem Biophys Res Commun 2020; 528:607-611. [DOI: 10.1016/j.bbrc.2020.05.137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 01/08/2023]
|
10
|
Merendino L, Courtois F, Grübler B, Bastien O, Straetmanns V, Chevalier F, Lerbs-Mache S, Lurin C, Pfannschmidt T. Retrograde signals from mitochondria reprogramme skoto-morphogenesis in Arabidopsis thaliana via alternative oxidase 1a. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190567. [PMID: 32362252 DOI: 10.1098/rstb.2019.0567] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The early steps in germination and development of angiosperm seedlings often occur in the dark, inducing a special developmental programme called skoto-morphogenesis. Under these conditions photosynthesis cannot work and all energetic requirements must be fulfilled by mitochondrial metabolization of storage energies. Here, we report the physiological impact of mitochondrial dysfunctions on the skoto-morphogenic programme by using the Arabidopsis rpoTmp mutant. This mutant is defective in the T7-phage-type organellar RNA polymerase shared by plastids and mitochondria. Lack of this enzyme causes a mitochondrial dysfunction resulting in a strongly reduced mitochondrial respiratory chain and a compensatory upregulation of the alternative-oxidase (AOX)-dependent respiration. Surprisingly, the mutant exhibits a triple-response-like phenotype with a twisted apical hook and a shortened hypocotyl. Highly similar phenotypes were detected in other respiration mutants (rug3 and atphb3) and in WT seedlings treated with the respiration inhibitor KCN. Further genetic and molecular data suggest that the observed skoto-morphogenic alterations are specifically dependent on the activity of the AOX1a enzyme. Microarray analyses indicated that a retrograde signal from mitochondria activates the ANAC017-dependent pathway which controls the activation of AOX1A transcription. In sum, our analysis identifies AOX as a functional link that couples the formation of a triple-response-like phenotype to mitochondrial dysfunction. This article is part of the theme issue 'Retrograde signalling from endosymbiotic organelles'.
Collapse
Affiliation(s)
- Livia Merendino
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France.,Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université, d'Evry, 91405 Orsay, France.,Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, CNRS, INRAE, 91405 Orsay, France
| | - Florence Courtois
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Björn Grübler
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Olivier Bastien
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Vera Straetmanns
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Fabien Chevalier
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Silva Lerbs-Mache
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| | - Claire Lurin
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Université, d'Evry, 91405 Orsay, France.,Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, CNRS, INRAE, 91405 Orsay, France
| | - Thomas Pfannschmidt
- Université Grenoble Alpes, CNRS, INRAE, CEA, IRIG-LPCV, 38000 Grenoble, France
| |
Collapse
|
11
|
Fuchs P, Rugen N, Carrie C, Elsässer M, Finkemeier I, Giese J, Hildebrandt TM, Kühn K, Maurino VG, Ruberti C, Schallenberg-Rüdinger M, Steinbeck J, Braun HP, Eubel H, Meyer EH, Müller-Schüssele SJ, Schwarzländer M. Single organelle function and organization as estimated from Arabidopsis mitochondrial proteomics. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 101:420-441. [PMID: 31520498 DOI: 10.1111/tpj.14534] [Citation(s) in RCA: 107] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/23/2019] [Accepted: 08/28/2019] [Indexed: 05/14/2023]
Abstract
Mitochondria host vital cellular functions, including oxidative phosphorylation and co-factor biosynthesis, which are reflected in their proteome. At the cellular level plant mitochondria are organized into hundreds of discrete functional entities, which undergo dynamic fission and fusion. It is the individual organelle that operates in the living cell, yet biochemical and physiological assessments have exclusively focused on the characteristics of large populations of mitochondria. Here, we explore the protein composition of an individual average plant mitochondrion to deduce principles of functional and structural organisation. We perform proteomics on purified mitochondria from cultured heterotrophic Arabidopsis cells with intensity-based absolute quantification and scale the dataset to the single organelle based on criteria that are justified by experimental evidence and theoretical considerations. We estimate that a total of 1.4 million protein molecules make up a single Arabidopsis mitochondrion on average. Copy numbers of the individual proteins span five orders of magnitude, ranging from >40 000 for Voltage-Dependent Anion Channel 1 to sub-stoichiometric copy numbers, i.e. less than a single copy per single mitochondrion, for several pentatricopeptide repeat proteins that modify mitochondrial transcripts. For our analysis, we consider the physical and chemical constraints of the single organelle and discuss prominent features of mitochondrial architecture, protein biogenesis, oxidative phosphorylation, metabolism, antioxidant defence, genome maintenance, gene expression, and dynamics. While assessing the limitations of our considerations, we exemplify how our understanding of biochemical function and structural organization of plant mitochondria can be connected in order to obtain global and specific insights into how organelles work.
Collapse
Affiliation(s)
- Philippe Fuchs
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
- Institut für Nutzpflanzenforschung und Ressourcenschutz (INRES), Rheinische Friedrich-Wilhelms-Universität Bonn, Friedrich-Ebert-Allee 144, 53113, Bonn, Germany
| | - Nils Rugen
- Institut für Pflanzengenetik, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Chris Carrie
- Department Biologie I - Botanik, Ludwig-Maximilians-Universität München, Grosshadernerstr. 2-4, 82152, Planegg-Martinsried, Germany
| | - Marlene Elsässer
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
- Institut für Nutzpflanzenforschung und Ressourcenschutz (INRES), Rheinische Friedrich-Wilhelms-Universität Bonn, Friedrich-Ebert-Allee 144, 53113, Bonn, Germany
- Institut für Zelluläre und Molekulare Botanik (IZMB), Rheinische Friedrich-Wilhelms-Universität Bonn, Kirschallee 1, 53115, Bonn, Germany
| | - Iris Finkemeier
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
| | - Jonas Giese
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
| | - Tatjana M Hildebrandt
- Institut für Pflanzengenetik, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Kristina Kühn
- Institut für Biologie, Martin-Luther-Universität Halle-Wittenberg, Weinbergweg 10, 06120, Halle/Saale, Germany
| | - Veronica G Maurino
- Institute of Developmental and Molecular Biology of Plants, and Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich Heine University Düsseldorf, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - Cristina Ruberti
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
| | - Mareike Schallenberg-Rüdinger
- Institut für Zelluläre und Molekulare Botanik (IZMB), Rheinische Friedrich-Wilhelms-Universität Bonn, Kirschallee 1, 53115, Bonn, Germany
| | - Janina Steinbeck
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
| | - Hans-Peter Braun
- Institut für Pflanzengenetik, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Holger Eubel
- Institut für Pflanzengenetik, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Etienne H Meyer
- Institut für Biologie, Martin-Luther-Universität Halle-Wittenberg, Weinbergweg 10, 06120, Halle/Saale, Germany
| | - Stefanie J Müller-Schüssele
- Institut für Nutzpflanzenforschung und Ressourcenschutz (INRES), Rheinische Friedrich-Wilhelms-Universität Bonn, Friedrich-Ebert-Allee 144, 53113, Bonn, Germany
| | - Markus Schwarzländer
- Institut für Biologie und Biotechnologie der Pflanzen (IBBP), Westfälische Wilhelms-Universität, Schlossplatz 7-8, 48143, Münster, Germany
| |
Collapse
|
12
|
Grossman A, Sanz-Luque E, Yi H, Yang W. Building the GreenCut2 suite of proteins to unmask photosynthetic function and regulation. Microbiology (Reading) 2019; 165:697-718. [DOI: 10.1099/mic.0.000788] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Arthur Grossman
- Department of Plant Biology, Carnegie Institution for Science, Stanford, CA, USA
| | - Emanuel Sanz-Luque
- Department of Plant Biology, Carnegie Institution for Science, Stanford, CA, USA
| | - Heng Yi
- Key Laboratory of Photobiology, Institute of Botany (CAS), Beijing, PR China
- University of Chinese Academy of Sciences, Beijing, PR China
| | - Wenqiang Yang
- Key Laboratory of Photobiology, Institute of Botany (CAS), Beijing, PR China
- University of Chinese Academy of Sciences, Beijing, PR China
| |
Collapse
|
13
|
Kataya ARA, Muench DG, Moorhead GB. A Framework to Investigate Peroxisomal Protein Phosphorylation in Arabidopsis. TRENDS IN PLANT SCIENCE 2019; 24:366-381. [PMID: 30683463 DOI: 10.1016/j.tplants.2018.12.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/11/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
Peroxisomes perform essential roles in a range of cellular processes, highlighted by lipid metabolism, reactive species detoxification, and response to a variety of stimuli. The ability of peroxisomes to grow, divide, respond to changing cellular needs, interact with other organelles, and adjust their proteome as required, suggest that, like other organelles, their specialized roles are highly regulated. Similar to most other cellular processes, there is an emerging role for protein phosphorylation to regulate these events. In this review, we establish a knowledge framework of key players that control protein phosphorylation events in the plant peroxisome (i.e., the protein kinases and phosphatases), and highlight a vastly expanded set of (phospho)substrates.
Collapse
Affiliation(s)
- Amr R A Kataya
- Department of Chemistry, Bioscience, and Environmental Engineering, University of Stavanger, Stavanger, 4036, Norway; Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada; www.katayaproject.com.
| | - Douglas G Muench
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Greg B Moorhead
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| |
Collapse
|
14
|
Meyer AJ, Riemer J, Rouhier N. Oxidative protein folding: state-of-the-art and current avenues of research in plants. THE NEW PHYTOLOGIST 2019; 221:1230-1246. [PMID: 30230547 DOI: 10.1111/nph.15436] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 08/01/2018] [Indexed: 06/08/2023]
Abstract
Contents Summary 1230 I. Introduction 1230 II. Formation and isomerization of disulfides in the ER and the Golgi apparatus 1231 III. The disulfide relay in the mitochondrial intermembrane space: why are plants different? 1236 IV. Disulfide bond formation on luminal proteins in thylakoids 1240 V. Conclusion 1242 Acknowledgements 1242 References 1242 SUMMARY: Disulfide bonds are post-translational modifications crucial for the structure and function of thousands of proteins. Their formation and isomerization, referred to as oxidative folding, require specific protein machineries found in oxidizing subcellular compartments, namely the endoplasmic reticulum and the associated endomembrane system, the intermembrane space of mitochondria and the thylakoid lumen of chloroplasts. At least one protein component is required for transferring electrons from substrate proteins to an acceptor that is usually molecular oxygen. For oxidation reactions, incoming reduced substrates are oxidized by thiol-oxidoreductase proteins (or domains in case of chimeric proteins), which are usually themselves oxidized by a single thiol oxidase, the enzyme generating disulfide bonds de novo. By contrast, the description of the molecular actors and pathways involved in proofreading and isomerization of misfolded proteins, which require a tightly controlled redox balance, lags behind. Herein we provide a general overview of the knowledge acquired on the systems responsible for oxidative protein folding in photosynthetic organisms, highlighting their particularities compared to other eukaryotes. Current research challenges are discussed including the importance and specificity of these oxidation systems in the context of the existence of reducing systems in the same compartments.
Collapse
Affiliation(s)
- Andreas J Meyer
- INRES-Chemical Signalling, University of Bonn, 53113, Bonn, Germany
| | - Jan Riemer
- Institute of Biochemistry, University of Cologne, 50674, Cologne, Germany
| | | |
Collapse
|
15
|
Plant mitochondrial protein import: the ins and outs. Biochem J 2018; 475:2191-2208. [PMID: 30018142 DOI: 10.1042/bcj20170521] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/19/2018] [Accepted: 06/21/2018] [Indexed: 01/29/2023]
Abstract
The majority of the mitochondrial proteome, required to fulfil its diverse range of functions, is cytosolically synthesised and translocated via specialised machinery. The dedicated translocases, receptors, and associated proteins have been characterised in great detail in yeast over the last several decades, yet many of the mechanisms that regulate these processes in higher eukaryotes are still unknown. In this review, we highlight the current knowledge of mitochondrial protein import in plants. Despite the fact that the mechanisms of mitochondrial protein import have remained conserved across species, many unique features have arisen in plants to encompass the developmental, tissue-specific, and stress-responsive regulation in planta. An understanding of unique features and mechanisms in plants provides us with a unique insight into the regulation of mitochondrial biogenesis in higher eukaryotes.
Collapse
|
16
|
Racca S, Welchen E, Gras DE, Tarkowská D, Turečková V, Maurino VG, Gonzalez DH. Interplay between cytochrome c and gibberellins during Arabidopsis vegetative development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 94:105-121. [PMID: 29385297 DOI: 10.1111/tpj.13845] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 01/04/2018] [Accepted: 01/15/2018] [Indexed: 05/18/2023]
Abstract
We studied the effect of reducing the levels of the mitochondrial electron carrier cytochrome c (CYTc) in Arabidopsis thaliana. Plants with CYTc deficiency have delayed growth and development, and reach flowering several days later than the wild-type but with the same number of leaves. CYTc-deficient plants accumulate starch and glucose during the day, and contain lower levels of active gibberellins (GA) and higher levels of DELLA proteins, involved in GA signaling. GA treatment abolishes the developmental delay and reduces glucose accumulation in CYTc-deficient plants, which also show a lower raise in ATP levels in response to glucose. Treatment of wild-type plants with inhibitors of mitochondrial energy production limits plant growth and increases the levels of DELLA proteins, thus mimicking the effects of CYTc deficiency. In addition, an increase in the amount of CYTc decreases DELLA protein levels and expedites growth, and this depends on active GA synthesis. We conclude that CYTc levels impinge on the activity of the GA pathway, most likely through changes in mitochondrial energy production. In this way, hormone-dependent growth would be coupled to the activity of components of the mitochondrial respiratory chain.
Collapse
Affiliation(s)
- Sofía 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
| | - 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
| | - 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
| | - Danuše Tarkowská
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany AS CR, Faculty of Science, Palacký University, Šlechtitelů 27, CZ-78371, Olomouc, Czech Republic
| | - Veronika Turečková
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany AS CR, Faculty of Science, Palacký University, Šlechtitelů 27, CZ-78371, Olomouc, Czech Republic
| | - Veronica G Maurino
- Institute of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Universitätsstraße 1, 40225, Düsseldorf, Germany
- Cluster of Excellence on Plant Sciences (CEPLAS), 40225, Düsseldorf, Germany
| | - 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
| |
Collapse
|
17
|
Majeran W, Le Caer JP, Ponnala L, Meinnel T, Giglione C. Targeted Profiling of Arabidopsis thaliana Subproteomes Illuminates Co- and Posttranslationally N-Terminal Myristoylated Proteins. THE PLANT CELL 2018; 30:543-562. [PMID: 29453228 PMCID: PMC5894833 DOI: 10.1105/tpc.17.00523] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 01/02/2018] [Accepted: 02/15/2018] [Indexed: 05/05/2023]
Abstract
N-terminal myristoylation, a major eukaryotic protein lipid modification, is difficult to detect in vivo and challenging to predict in silico. We developed a proteomics strategy involving subfractionation of cellular membranes, combined with separation of hydrophobic peptides by mass spectrometry-coupled liquid chromatography to identify the Arabidopsis thaliana myristoylated proteome. This approach identified a starting pool of 8837 proteins in all analyzed cellular fractions, comprising 32% of the Arabidopsis proteome. Of these, 906 proteins contain an N-terminal Gly at position 2, a prerequisite for myristoylation, and 214 belong to the predicted myristoylome (comprising 51% of the predicted myristoylome of 421 proteins). We further show direct evidence of myristoylation in 72 proteins; 18 of these myristoylated proteins were not previously predicted. We found one myristoylation site downstream of a predicted initiation codon, indicating that posttranslational myristoylation occurs in plants. Over half of the identified proteins could be quantified and assigned to a subcellular compartment. Hierarchical clustering of protein accumulation combined with myristoylation and S-acylation data revealed that N-terminal double acylation influences redirection to the plasma membrane. In a few cases, MYR function extended beyond simple membrane association. This study identified hundreds of N-acylated proteins for which lipid modifications could control protein localization and expand protein function.
Collapse
Affiliation(s)
- Wojciech Majeran
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France
| | - Jean-Pierre Le Caer
- Institut de Chimie des Substances Naturelles, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France
| | - Lalit Ponnala
- Computational Biology Service Unit, Cornell University, Ithaca, New York 14850
| | - Thierry Meinnel
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France
| | - Carmela Giglione
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France
| |
Collapse
|
18
|
White-Gloria C, Johnson JJ, Marritt K, Kataya A, Vahab A, Moorhead GB. Protein Kinases and Phosphatases of the Plastid and Their Potential Role in Starch Metabolism. FRONTIERS IN PLANT SCIENCE 2018; 9:1032. [PMID: 30065742 PMCID: PMC6056723 DOI: 10.3389/fpls.2018.01032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 06/25/2018] [Indexed: 05/03/2023]
Abstract
Phospho-proteomic studies have confirmed that phosphorylation is a common mechanism to regulate protein function in the chloroplast, including the enzymes of starch metabolism. In addition to the photosynthetic machinery protein kinases (STN7 and STN8) and their cognate protein phosphatases PPH1 (TAP38) and PBCP, multiple other protein kinases and phosphatases have now been localized to the chloroplast. Here, we build a framework for understanding protein kinases and phosphatases, their regulation, and potential roles in starch metabolism. We also catalog mapped phosphorylation sites on proteins of chloroplast starch metabolism to illustrate the potential and mostly unknown roles of protein phosphorylation in the regulation of starch biology.
Collapse
Affiliation(s)
- Chris White-Gloria
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Jayde J. Johnson
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Kayla Marritt
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Amr Kataya
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
- Department of Chemistry and Biosciences, University of Stavanger, Stavanger, Norway
| | - Ahmad Vahab
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
| | - Greg B. Moorhead
- Department of Biological Sciences, University of Calgary, Calgary, AB, Canada
- *Correspondence: Greg B. Moorhead,
| |
Collapse
|
19
|
Peleh V, Zannini F, Backes S, Rouhier N, Herrmann JM. Erv1 of Arabidopsis thaliana can directly oxidize mitochondrial intermembrane space proteins in the absence of redox-active Mia40. BMC Biol 2017; 15:106. [PMID: 29117860 PMCID: PMC5679390 DOI: 10.1186/s12915-017-0445-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 10/19/2017] [Indexed: 11/20/2022] Open
Abstract
Background Many proteins of the mitochondrial intermembrane space (IMS) contain structural disulfide bonds formed by the mitochondrial disulfide relay. In fungi and animals, the sulfhydryl oxidase Erv1 ‘generates’ disulfide bonds that are passed on to the oxidoreductase Mia40, which oxidizes substrate proteins. A different structural organization of plant Erv1 proteins compared to that of animal and fungal orthologs was proposed to explain its inability to complement the corresponding yeast mutant. Results Herein, we have revisited the biochemical and functional properties of Arabidopsis thaliana Erv1 by both in vitro reconstituted activity assays and complementation of erv1 and mia40 yeast mutants. These mutants were viable, however, they showed severe defects in the biogenesis of IMS proteins. The plant Erv1 was unable to oxidize yeast Mia40 and rather even blocked its activity. Nevertheless, it was able to mediate the import and folding of mitochondrial proteins. Conclusions We observed that plant Erv1, unlike its homologs in fungi and animals, can promote protein import and oxidative protein folding in the IMS independently of the oxidoreductase Mia40. In accordance to the absence of Mia40 in many protists, our study suggests that the mitochondrial disulfide relay evolved in a stepwise reaction from an Erv1-only system to which Mia40 was added in order to improve substrate specificity. The mitochondrial disulfide relay evolved in a step-wise manner from an Erv1-only system. ![]()
Electronic supplementary material The online version of this article (doi:10.1186/s12915-017-0445-8) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Valentina Peleh
- Cell Biology, University of Kaiserslautern, Erwin-Schrödinger-Strasse 13, 67663, Kaiserslautern, Germany
| | - Flavien Zannini
- Unité Mixte de Recherches 1136 Interactions Arbres-Microorganismes, Université de Lorraine/INRA, Faculté des sciences et technologies, 54500 Vandoeuvre-lès-Nancy, Nancy, France
| | - Sandra Backes
- Cell Biology, University of Kaiserslautern, Erwin-Schrödinger-Strasse 13, 67663, Kaiserslautern, Germany
| | - Nicolas Rouhier
- Unité Mixte de Recherches 1136 Interactions Arbres-Microorganismes, Université de Lorraine/INRA, Faculté des sciences et technologies, 54500 Vandoeuvre-lès-Nancy, Nancy, France.
| | - Johannes M Herrmann
- Cell Biology, University of Kaiserslautern, Erwin-Schrödinger-Strasse 13, 67663, Kaiserslautern, Germany.
| |
Collapse
|
20
|
Uhrig RG, Moorhead G. AtSLP2 is an intronless protein phosphatase that co-expresses with intronless mitochondrial pentatricopeptide repeat (PPR) and tetratricopeptide (TPR) protein encoding genes. PLANT SIGNALING & BEHAVIOR 2017; 12:e1307493. [PMID: 28350216 PMCID: PMC5437834 DOI: 10.1080/15592324.2017.1307493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 03/11/2017] [Accepted: 03/13/2017] [Indexed: 06/06/2023]
Abstract
Shewanella-like PPP family phosphatases (SLPs) are a unique lineage of eukaryote PPP-family phosphatases of bacterial origin which are not found in metazoans. 1,2 Their absence in metazoans is marked by their ancient bacterial origins and presence in plants. 1 Recently, we found that the SLP2 phosphatase ortholog of Arabidopsis thaliana localized to the mitochondrial intermembrane space (IMS) where it was determined to be activated by mitochondrial intermembrane space protein 40 (MIA40) to regulate seed germination. 3 Through examination of atslp2 knockout (accelerated germination) and 35S::AtSLP2 over-expressing (delayed germination) plants it was found that AtSLP2 influences Arabidopsis thaliana germination rates via gibberellic acid (GA) biosynthesis. 3 However, the exact mechanism by which this occurs remains unresolved. To identify potential partners of AtSLP2 in regulating germination through GA, we undertook a gene co-expression network analysis using RNA-sequencing data available through Genevestigator ( https://genevestigator.com/gv/ ).
Collapse
Affiliation(s)
- R. Glen Uhrig
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada
- Group of Plant Biotechnology, Department of Biology, Swiss Federal Institute of Technology, Zurich, Switzerland
| | - Greg Moorhead
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada
| |
Collapse
|