1
|
Hirt H, Al-Babili S, Almeida-Trapp M, Martin A, Aranda M, Bartels D, Bennett M, Blilou I, Boer D, Boulouis A, Bowler C, Brunel-Muguet S, Chardon F, Colcombet J, Colot V, Daszkowska-Golec A, Dinneny JR, Field B, Froehlich K, Gardener CH, Gojon A, Gomès E, Gomez-Alvarez EM, Gutierrez C, Havaux M, Hayes S, Heard E, Hodges M, Alghamdi AK, Laplaze L, Lauersen KJ, Leonhardt N, Johnson X, Jones J, Kollist H, Kopriva S, Krapp A, Masson MLP, McCabe MF, Merendino L, Molina A, Moreno Ramirez JL, Mueller-Roeber B, Nicolas M, Nir I, Orduna IO, Pardo JM, Reichheld JP, Rodriguez PL, Rouached H, Saad MM, Schlögelhofer P, Singh KA, De Smet I, Stanschewski C, Stra A, Tester M, Walsh C, Weber APM, Weigel D, Wigge P, Wrzaczek M, Wulff BBH, Young IM. PlantACT! - how to tackle the climate crisis. Trends Plant Sci 2023; 28:537-543. [PMID: 36740490 DOI: 10.1016/j.tplants.2023.01.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/15/2023] [Accepted: 01/18/2023] [Indexed: 05/22/2023]
Abstract
Greenhouse gas (GHG) emissions have created a global climate crisis which requires immediate interventions to mitigate the negative effects on all aspects of life on this planet. As current agriculture and land use contributes up to 25% of total GHG emissions, plant scientists take center stage in finding possible solutions for a transition to sustainable agriculture and land use. In this article, the PlantACT! (Plants for climate ACTion!) initiative of plant scientists lays out a road map of how and in which areas plant scientists can contribute to finding immediate, mid-term, and long-term solutions, and what changes are necessary to implement these solutions at the personal, institutional, and funding levels.
Collapse
Affiliation(s)
- Heribert Hirt
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
| | - Salim Al-Babili
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Marilia Almeida-Trapp
- Core labs, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Antoine Martin
- IPSiM, Université Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France
| | - Manuel Aranda
- Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Dorothea Bartels
- University of Bonn, Molecular Physiology, Kirschallee 1, D-53115 Bonn, Germany
| | - Malcolm Bennett
- Future Food Beacon and School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK
| | - Ikram Blilou
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Damian Boer
- Laboratory of Plant Physiology, Wageningen University, 6700 AA Wageningen, The Netherlands
| | - Alix Boulouis
- UMR7141, CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, 75005 Paris, France
| | - Chris Bowler
- Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, 75005 Paris, France
| | - Sophie Brunel-Muguet
- INRAE, Normandie Univ, UNICAEN, UMR 950 Ecophysiologie Végétale, Agronomie et nutritions N, C, S, SFR Normandie Végétal (FED 4277), Esplanade de la Paix, 14032 Caen, France
| | - Fabien Chardon
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Jean Colcombet
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Université Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Vincent Colot
- Institute of Biology of the Ecole Normale Supérieure, Paris, France
| | - Agata Daszkowska-Golec
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Jose R Dinneny
- Stanford University, Department of Biology, Stanford, CA 94305, USA
| | - Ben Field
- Aix-Marseille Univ, CEA, CNRS, BIAM, UMR7265, 13009 Marseille, France
| | - Katja Froehlich
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Catherine H Gardener
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Alain Gojon
- IPSiM, Université Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France
| | - Eric Gomès
- EGFV, Université Bordeaux, Bordeaux Sciences Agro, INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | | | - Crisanto Gutierrez
- Centro de Biologia Molecular Severo Ochoa, CSIC-UAM, Nicolas Cabrera 1, Cantoblanco, 28049 Madrid, Spain
| | - Michel Havaux
- Aix-Marseille University, CEA, CNRS UMR7265, BIAM, CEA/Cadarache, F-13108 Saint-Paul-lez-Durance, France
| | - Scott Hayes
- Laboratory of Plant Physiology, Wageningen University, 6700 AA Wageningen, The Netherlands
| | - Edith Heard
- EMBL Heidelberg, Meyerhofstr. 1, D-69117 Heidelberg, Germany
| | - Michael Hodges
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Université Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Amal Khalaf Alghamdi
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Laurent Laplaze
- DIADE, Université de Montpellier, IRD, CIRAD, 34394 Montpellier cedex 5, France
| | - Kyle J Lauersen
- Bioengineering Program, Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Nathalie Leonhardt
- Aix Marseille Univ, CEA, CNRS, BIAM, Saint Paul-Lez-Durance, F-13108, France
| | - Xenie Johnson
- Photosynthesis and Environment Team (P&E), Institut de Biosciences et Biotechnologies d'Aix-Marseille (BIAM), UMR 7265 CNRS-CEA-Université Aix-Marseille II, CEA Cadarache Bat 156, 13108 St Paul lez Durance, France
| | | | - Hannes Kollist
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia
| | - Stanislav Kopriva
- Institute for Plant Sciences, Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, 50674 Cologne, Germany
| | - Anne Krapp
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Mauricio Lopez-Portillo Masson
- Laboratory for Genome Engineering and Synthetic Biology, Division of Biological Sciences, 4700 King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Matthew F McCabe
- Climate and Livability Initiative, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Livia Merendino
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Université Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Antonio Molina
- Centro de Biotecnología y Genómica de Plantas (CBGP, UPM-INIA/CSIC), Universidad Politécnica de Madrid (UPM) - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA/CSIC), Campus de Montegancedo-UPM, 28223-Pozuelo de Alarcón (Madrid), Spain
| | - Jose L Moreno Ramirez
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Bernd Mueller-Roeber
- University Potsdam, Institute for Biochemistry and Biology, Molecular Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
| | - Michael Nicolas
- Laboratory of Plant Physiology, Wageningen University, 6700 AA Wageningen, The Netherlands; Department of Plants Physiology, Wageningen University and Research, Wageningen, The Netherlands
| | - Ido Nir
- Institute of Plant Sciences, ARO, Volcani Institute, HaMaccabbim Road, 68, Rishon LeZion, Israel; Stanford University, Department of Biology, Stanford, CA 94305, USA
| | - Izamar Olivas Orduna
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Jose M Pardo
- Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC-Universidad de Sevilla, Sevilla-41092, Spain
| | - Jean-Philippe Reichheld
- Laboratoire Genome et Developpement des Plantes, Universite ́ Perpignan Via Domitia, 66860 Perpignan, France
| | - Pedro L Rodriguez
- Instituto de Biologia Molecular y Celular de Plantas Consejo Superior de Investigaciones Científicas-Univ, Politécnica Avd de los Naranjos, Edificio CPI, 8 ES-46022, Valencia, Spain
| | - Hatem Rouached
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI 48823, USA; Plant Resilience Institute, Michigan State University, East Lansing, MI 48824, USA
| | - Maged M Saad
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | | | - Kirti A Singh
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Ive De Smet
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium; VIB Center for Plant Systems Biology, B-9052 Ghent, Belgium
| | - Clara Stanschewski
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Alice Stra
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Mark Tester
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Catherine Walsh
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YW, UK
| | - Andreas P M Weber
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-University, 40225 Düsseldorf, Germany
| | - Detlef Weigel
- Max Planck Institute for Biology Tübingen, Max-Planck-Ring 5, 72076 Tübingen, Germany
| | - Philip Wigge
- University Potsdam, Institute for Biochemistry and Biology, Molecular Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - Michael Wrzaczek
- Institute of Plant Molecular Biology, Biology Centre CAS, Branišovská 1160/31, 370 05 České Budějovice, Czech Republic; Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Centre, Faculty of Biological and Environmental Sciences, Viikki Biocenter 3, PO Box 65, FIN-00014, Helsinki University, Finland
| | - Brande B H Wulff
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Iain M Young
- Center for Desert Agriculture (CDA), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| |
Collapse
|
2
|
Zhang X, Hamilton XD, Taylor Z, Guan J, Hodges M, Qu S, Huang Y. Longitudinal changes in Chinese minority college students' health-related fitness: A multilevel latent growth curve modeling approach. J Am Coll Health 2022:1-9. [PMID: 35622974 DOI: 10.1080/07448481.2022.2066955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 01/02/2022] [Accepted: 04/05/2022] [Indexed: 06/15/2023]
Abstract
PURPOSE The study aimed to test the overall changes of health-related fitness (HRF) in minority Chinese college students and to examine HRF differences in gender, race, and year in college. Method: Participants (n = 1320) were minority college students with more than two-thirds females (ie 76.1%), and Hui, Tibetan, and Mongolia consisted of 13.8%, 13.8%, and 11.2%, respectively. Student HRF was tracked for four years. Data were analyzed using multilevel latent growth curve modeling. Results: Muscular strength and endurance were the weakest component in minority college students' HRF, while body mass index was within the category of "excellent". Males outperformed female on all components of HRF. Conclusions: It is suggested that interventions concerning minority females' HRF and muscular strength and endurance for both genders be constructed and tested.
Collapse
Affiliation(s)
- Xin Zhang
- Department of Physical Education, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Xiaofen D Hamilton
- Department of Curriculum and Instruction, University of Texas at Austin, Austin, Texas, USA
| | - Zach Taylor
- Department of Educational Research, College of Educational and Human Services, University of Southern Mississippi, Hattiesburg, Mississippi, USA
| | - Jianmin Guan
- Department of Kinesiology, The University of Texas at San Antonio, San Antonio, Texas, USA
| | - Michael Hodges
- Department of Health, Physical Education and Recreation, Bronx Community College, Bronx, New York, USA
| | - Shuhua Qu
- College of Athletics, Beijing Sport University, Beijing, China
| | - Yong Huang
- Department of Physical Education, Jiangxi Agricultural University, Nanchang, China
| |
Collapse
|
3
|
Pokotylo I, Hodges M, Kravets V, Ruelland E. A ménage à trois: salicylic acid, growth inhibition, and immunity. Trends Plant Sci 2022; 27:460-471. [PMID: 34872837 DOI: 10.1016/j.tplants.2021.11.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 11/09/2021] [Accepted: 11/09/2021] [Indexed: 06/13/2023]
Abstract
Salicylic acid (SA) is a plant hormone almost exclusively associated with the promotion of immunity. It is also known that SA has a negative impact on plant growth, yet only limited efforts have been dedicated to explain this facet of SA action. In this review, we focus on SA-related reduced growth and discuss whether it is a regulated process and if the role of SA in immunity imperatively comes with growth suppression. We highlight molecular targets of SA that interfere with growth and describe scenarios where SA can improve plant immunity without a growth penalty.
Collapse
Affiliation(s)
- Igor Pokotylo
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, NASU, 02094 Kyiv, Ukraine.
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), UMR CNRS 9213, Université Paris-Saclay, INRAE, Université d'Evry, Université de Paris, 91190 Gif-sur-Yvette, France
| | - Volodymyr Kravets
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, NASU, 02094 Kyiv, Ukraine
| | - Eric Ruelland
- Université de Technologie de Compiègne, CNRS Enzyme and Cell Engineering Laboratory, Rue du Docteur Schweitzer, 60203 Compiègne, France.
| |
Collapse
|
4
|
Launay A, Jolivet S, Clément G, Zarattini M, Dellero Y, Le Hir R, Jossier M, Hodges M, Expert D, Fagard M. DspA/E-Triggered Non-Host Resistance against E. amylovora Depends on the Arabidopsis GLYCOLATE OXIDASE 2 Gene. Int J Mol Sci 2022; 23:ijms23084224. [PMID: 35457046 PMCID: PMC9029980 DOI: 10.3390/ijms23084224] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/31/2022] [Accepted: 04/03/2022] [Indexed: 12/04/2022] Open
Abstract
DspA/E is a type three effector injected by the pathogenic bacterium Erwinia amylovora inside plant cells. In non-host Arabidopsis thaliana, DspA/E inhibits seed germination, root growth, de novo protein synthesis and triggers localized cell death. To better understand the mechanisms involved, we performed EMS mutagenesis on a transgenic line, 13-1-2, containing an inducible dspA/E gene. We identified three suppressor mutants, two of which belonged to the same complementation group. Both were resistant to the toxic effects of DspA/E. Metabolome analysis showed that the 13-1-2 line was depleted in metabolites of the TCA cycle and accumulated metabolites associated with cell death and defense. TCA cycle and cell-death associated metabolite levels were respectively increased and reduced in both suppressor mutants compared to the 13-1-2 line. Whole genome sequencing indicated that both suppressor mutants displayed missense mutations in conserved residues of Glycolate oxidase 2 (GOX2), a photorespiratory enzyme that we confirmed to be localized in the peroxisome. Leaf GOX activity increased in leaves infected with E. amylovora in a DspA/E-dependent manner. Moreover, the gox2-2 KO mutant was more sensitive to E. amylovora infection and displayed reduced JA-signaling. Our results point to a role for glycolate oxidase in type II non-host resistance and to the importance of central metabolic functions in controlling growth/defense balance.
Collapse
Affiliation(s)
- Alban Launay
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Sylvie Jolivet
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Gilles Clément
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Marco Zarattini
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Younes Dellero
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France; (Y.D.); (M.J.); (M.H.)
- Université Paris Cité, CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Rozenn Le Hir
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Mathieu Jossier
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France; (Y.D.); (M.J.); (M.H.)
- Université Paris Cité, CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Michael Hodges
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France; (Y.D.); (M.J.); (M.H.)
- Université Paris Cité, CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), 91190 Gif sur Yvette, France
| | - Dominique Expert
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
| | - Mathilde Fagard
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France; (A.L.); (S.J.); (G.C.); (M.Z.); (R.L.H.); (D.E.)
- Correspondence:
| |
Collapse
|
5
|
Hodges M, Sanders G. M237 DEVELOPMENT OF ADULT COW’S MILK ALLERGY AFTER AVOIDANCE. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
6
|
Duminil P, Davanture M, Oury C, Boex-Fontvieille E, Tcherkez G, Zivy M, Hodges M, Glab N. Arabidopsis thaliana 2,3-bisphosphoglycerate-independent phosphoglycerate mutase 2 activity requires serine 82 phosphorylation. Plant J 2021; 107:1478-1489. [PMID: 34174129 DOI: 10.1111/tpj.15395] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 05/18/2021] [Accepted: 05/22/2021] [Indexed: 06/13/2023]
Abstract
Phosphoglycerate mutases (PGAMs) catalyse the reversible isomerisation of 3-phosphoglycerate and 2-phosphoglycerate, a step of glycolysis. PGAMs can be sub-divided into 2,3-bisphosphoglycerate-dependent (dPGAM) and -independent (iPGAM) enzymes. In plants, phosphoglycerate isomerisation is carried out by cytosolic iPGAM. Despite its crucial role in catabolism, little is known about post-translational modifications of plant iPGAM. In Arabidopsis thaliana, phosphoproteomics analyses have previously identified an iPGAM phosphopeptide where serine 82 is phosphorylated. Here, we show that this phosphopeptide is less abundant in dark-adapted compared to illuminated Arabidopsis leaves. In silico comparison of iPGAM protein sequences and 3D structural modelling of AtiPGAM2 based on non-plant iPGAM enzymes suggest a role for phosphorylated serine in the catalytic reaction mechanism. This is confirmed by the activity (or the lack thereof) of mutated recombinant Arabidopsis iPGAM2 forms, affected in different steps of the reaction mechanism. We thus propose that the occurrence of the S82-phosphopeptide reflects iPGAM2 steady-state catalysis. Based on this assumption, the metabolic consequences of a higher iPGAM activity in illuminated versus darkened leaves are discussed.
Collapse
Affiliation(s)
- Pauline Duminil
- Institute of Plant Sciences Paris-Saclay (IPS2), INRAe, CNRS, Université Evry, Université Paris-Saclay, Bat 630, Gif sur Yvette, 91190, France
| | - Marlène Davanture
- INRAE, CNRS, AgroParisTech, Université Paris-Saclay, PAPPSO, GQE-Le Moulon, Gif-sur-Yvette, 91190, France
| | - Céline Oury
- Institute of Plant Sciences Paris-Saclay (IPS2), INRAe, CNRS, Université Evry, Université Paris-Saclay, Bat 630, Gif sur Yvette, 91190, France
| | - Edouard Boex-Fontvieille
- Institute of Plant Sciences Paris-Saclay (IPS2), INRAe, CNRS, Université Evry, Université Paris-Saclay, Bat 630, Gif sur Yvette, 91190, France
| | - Guillaume Tcherkez
- Research School of Biology, ANU Joint College of Sciences, Australian National University, Canberra, ACT, 2601, Australia
- Institut de Recherche en Horticulture et Semences, Université d'Angers, INRAe, 42 rue Georges Morel, Beaucouzé, 49070, France
| | - Michel Zivy
- INRAE, CNRS, AgroParisTech, Université Paris-Saclay, PAPPSO, GQE-Le Moulon, Gif-sur-Yvette, 91190, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), INRAe, CNRS, Université Evry, Université Paris-Saclay, Bat 630, Gif sur Yvette, 91190, France
| | - Nathalie Glab
- Institute of Plant Sciences Paris-Saclay (IPS2), INRAe, CNRS, Université Evry, Université Paris-Saclay, Bat 630, Gif sur Yvette, 91190, France
| |
Collapse
|
7
|
Dellero Y, Mauve C, Jossier M, Hodges M. The Impact of Photorespiratory Glycolate Oxidase Activity on Arabidopsis thaliana Leaf Soluble Amino Acid Pool Sizes during Acclimation to Low Atmospheric CO 2 Concentrations. Metabolites 2021; 11:metabo11080501. [PMID: 34436442 PMCID: PMC8399254 DOI: 10.3390/metabo11080501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 07/22/2021] [Accepted: 07/26/2021] [Indexed: 01/17/2023] Open
Abstract
Photorespiration is a metabolic process that removes toxic 2-phosphoglycolate produced by the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase. It is essential for plant growth under ambient air, and it can play an important role under stress conditions that reduce CO2 entry into the leaf thus enhancing photorespiration. The aim of the study was to determine the impact of photorespiration on Arabidopsis thaliana leaf amino acid metabolism under low atmospheric CO2 concentrations. To achieve this, wild-type plants and photorespiratory glycolate oxidase (gox) mutants were given either short-term (4 h) or long-term (1 to 8 d) low atmospheric CO2 concentration treatments and leaf amino acid levels were measured and analyzed. Low CO2 treatments rapidly decreased net CO2 assimilation rate and triggered a broad reconfiguration of soluble amino acids. The most significant changes involved photorespiratory Gly and Ser, aromatic and branched-chain amino acids as well as Ala, Asp, Asn, Arg, GABA and homoSer. While the Gly/Ser ratio increased in all Arabidopsis lines between air and low CO2 conditions, low CO2 conditions led to a higher increase in both Gly and Ser contents in gox1 and gox2.2 mutants when compared to wild-type and gox2.1 plants. Results are discussed with respect to potential limiting enzymatic steps with a special emphasis on photorespiratory aminotransferase activities and the complexity of photorespiration.
Collapse
Affiliation(s)
- Younès Dellero
- Institute for Genetics, Environment and Plant Protection (IGEPP), National Institute for Research for Agriculture, Food and Environment (INRAE), Institut Agro, Univ Rennes, 35653 Le Rheu, France
- Correspondence: (Y.D.); (M.H.)
| | - Caroline Mauve
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, National Committee of Scientific Research (CNRS), National Institute for Research for Agriculture, Food and Environment (INRAE), Université d’Evry, Université de Paris, 91190 Gif-sur-Yvette, France; (C.M.); (M.J.)
| | - Mathieu Jossier
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, National Committee of Scientific Research (CNRS), National Institute for Research for Agriculture, Food and Environment (INRAE), Université d’Evry, Université de Paris, 91190 Gif-sur-Yvette, France; (C.M.); (M.J.)
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, National Committee of Scientific Research (CNRS), National Institute for Research for Agriculture, Food and Environment (INRAE), Université d’Evry, Université de Paris, 91190 Gif-sur-Yvette, France; (C.M.); (M.J.)
- Correspondence: (Y.D.); (M.H.)
| |
Collapse
|
8
|
Dellero Y, Jossier M, Bouchereau A, Hodges M, Leport L. Leaf Phenological Stages of Winter Oilseed Rape ( Brassica napus L.) Have Conserved Photosynthetic Efficiencies but Contrasted Intrinsic Water Use Efficiencies at High Light Intensities. Front Plant Sci 2021; 12:659439. [PMID: 33936148 PMCID: PMC8083057 DOI: 10.3389/fpls.2021.659439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Leaf senescence in source leaves leads to the active degradation of chloroplast components [photosystems, chlorophylls, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)] and plays a key role in the efficient remobilization of nutrients toward sink tissues. However, the progression of leaf senescence can differentially modify the photosynthetic properties of source leaves depending on plant species. In this study, the photosynthetic and respiratory properties of four leaf ranks of oilseed rape describing leaf phenological stages having different sink-source activities were analyzed. To achieve this, photosynthetic pigments, total soluble proteins, Rubisco amounts, and the light response of chlorophyll fluorescence parameters coupled to leaf gas exchanges and leaf water content were measured. Photosynthetic CO2 assimilation and electron transfer rates, Rubisco and chlorophyll levels per leaf area were gradually decreased between young, mature and senescent leaves but they remained highly correlated at saturating light intensities. However, senescent leaves of oilseed rape had a lower intrinsic water use efficiency compared to young and mature leaves at saturating light intensities that was mainly due to higher stomatal conductance and transpiration rate with respect to stomatal density and net CO2 assimilation. The results are in favor of a concerted degradation of chloroplast components but a contrasted regulation of water status between leaves of different phenological stages of winter oilseed rape.
Collapse
Affiliation(s)
- Younès Dellero
- Institute for Genetics, Environment and Plant Protection (IGEPP), National Research Institute for Agriculture, Food and Environment (INRAE), Institut Agro, Université Rennes, Le Rheu, France
| | - Mathieu Jossier
- Université Paris-Saclay, NAtional Committee of Scientific Research (CNRS), National Research Institute for Agriculture, Food and Environment (INRAE), Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
| | - Alain Bouchereau
- Institute for Genetics, Environment and Plant Protection (IGEPP), National Research Institute for Agriculture, Food and Environment (INRAE), Institut Agro, Université Rennes, Le Rheu, France
| | - Michael Hodges
- Université Paris-Saclay, NAtional Committee of Scientific Research (CNRS), National Research Institute for Agriculture, Food and Environment (INRAE), Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
| | - Laurent Leport
- Institute for Genetics, Environment and Plant Protection (IGEPP), National Research Institute for Agriculture, Food and Environment (INRAE), Institut Agro, Université Rennes, Le Rheu, France
| |
Collapse
|
9
|
Bulpa P, Rahav G, Oren I, Aoun M, Thompson GR, Pappas P, Kullberg BJ, Vazquez JA, Barbat S, Wedel P, Schlamm HT, Hodges M. 1157. Clinical Safety, Efficacy, and Pharmacokinetics of Fosmanogepix, a Novel First-in-class Antifungal, in Patients with Renal Insufficiency: Subset Analysis from a Phase 2 Candidemia Trial. Open Forum Infect Dis 2020. [PMCID: PMC7776851 DOI: 10.1093/ofid/ofaa439.1343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Fosmanogepix (FMGX) is a first-in-class antifungal agent, with a unique MOA targeting the fungal enzyme Gwt1, and broad-spectrum activity against yeasts and molds, including fungi resistant to other antifungal agents. Patients with candidemia often have underlying renal insufficiency or are receiving medications that affect renal function. This analysis evaluated outcomes in patients with varying degrees of renal insufficiency.
Methods
This global, multicenter, open-label, non-comparative study evaluated the safety and efficacy of FMGX for first-line treatment of candidemia. Patients with a recent diagnosis of candidemia defined as positive blood culture for Candida spp within 96 hrs prior to study entry with ≤ 2 days of prior antifungal treatment were eligible, including those with renal insufficiency. Patients with neutropenia, C. krusei infection, deep-seated Candida infections or receiving hemodialysis were excluded. Subjects were treated with FMGX for up to 14 days: 1000 mg IV BID for 1 day, then 600 mg IV QD for at least 2 days, followed by either 600 mg IV QD or 700 mg PO QD. Patients requiring antifungal treatment beyond 14 days received fluconazole. The primary efficacy endpoint was outcome at end of study treatment (EOST) as determined by an independent data review committee. Successful outcome was defined as survival with clearance of Candida from blood cultures with no additional antifungal treatment.
Results
14/21 (66%) subjects had some degree of renal insufficiency: 7 had mild renal insufficiency (GFR:60-89), 5 had moderate renal insufficiency (GFR:30-59), and 2 had severe renal insufficiency (GFR:15-29). 12/14 (86%) completed study treatment, and treatment was successful at EOST in 12/14 (86%) subjects. Decline in renal function was not observed at EOST. 4 had worsening of renal function during the follow-up period; none required dialysis. Renal impairment did not increase exposure of FMGX. There were no treatment-related adverse events.
Conclusion
FMGX demonstrated high level treatment success with no evidence of drug-related nephrotoxicity, with no dose adjustments required. These preliminary data support the continued evaluation of FMGX in patients with candidemia and renal dysfunction as an alternative to potentially nephrotoxic antifungal agents.
Disclosures
Pierre Bulpa, MD, Amplyx Pharmaceuticals (Scientific Research Study Investigator) Galia Rahav, MD, AstraZeneca (Scientific Research Study Investigator) Mickaël Aoun, MD, Amplyx Pharmaceuticals (Scientific Research Study Investigator) Peter Pappas, MD, SCYNEXIS, Inc. (Consultant, Advisor or Review Panel member, Research Grant or Support) Bart Jan Kullberg, MD, FRCP, FIDSA, Amplyx (Advisor or Review Panel member) Sara Barbat, BSN, RN, Amplyx Pharmaceuticals (Employee) Pamela Wedel, BSc, Amplyx Pharmaceuticals (Employee) Haran T. Schlamm, MD, Amplyx (Consultant) Michael Hodges, BSc. MD, Amplyx Pharmaceuticals Inc. (Employee)
Collapse
Affiliation(s)
- Pierre Bulpa
- Mont-Godinne University Hospital, CHU UCL Namur, Yvoir, Namur, Belgium
| | - Galia Rahav
- Sheba Medical Center and Tel Aviv University, Ramat Gan, HaMerkaz, Israel
| | | | - Mickaël Aoun
- Institut Jules Bordet, Brussels, Brussels Hoofdstedelijk Gewest, Belgium
| | | | - Peter Pappas
- University of Alabama at Birmingham, Birmingham, Alabama
| | | | - Jose A Vazquez
- Medical College of Georgia at Augusta University, Augusta, Georgia
| | - Sara Barbat
- Amplyx Pharmaceutical, San Diego, California
| | | | | | | |
Collapse
|
10
|
Pappas P, Kullberg BJ, Vazquez JA, Oren I, Rahav G, Aoun M, Bulpa P, Ben-Ami R, Ferrer R, McCarty TP, Thompson III GR, Barbat S, Wedel P, Oborska I, Schlamm HT, Hodges M. 147. Clinical Safety and Efficacy of Novel Antifungal, Fosmanogepix, in the Treatment of Candidemia: Results from a Phase 2 Proof of Concept Trial. Open Forum Infect Dis 2020. [PMCID: PMC7777973 DOI: 10.1093/ofid/ofaa439.457] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background Fosmanogepix (FMGX) is a first-in-class antifungal agent, with a unique MOA targeting the fungal enzyme Gwt1, that has broad-spectrum activity against both yeasts, molds, and dimorphic fungi, including fungi resistant to other antifungal agents. FMGX has a favorable safety profile, reduced potential for clinically significant drug-drug interactions, and is formulated for IV and oral administration. Methods This global, multicenter, open-label, non-comparative study evaluated the safety and efficacy of FMGX for first-line treatment of candidemia. Patients with a recent diagnosis of candidemia defined as positive blood culture for Candida spp. within 96 hrs prior to study entry, with ≤2 days of prior antifungal treatment were eligible. Patients with neutropenia, C. krusei infection, or deep-seated Candida infections were excluded. Patients were treated with FMGX for up to 14 days: 1000 mg IV BID for 1 day, then 600 mg IV QD for at least 2 days, followed by either 600 mg IV QD or 700 mg PO QD. Short-term fluconazole (or appropriate alternative) could follow if treatment was required beyond 14 days. Patients with a diagnosis of candidemia within 96 hrs of start of study drug who received at least 1 dose of FMGX were included in the mITT population. The primary efficacy endpoint was outcome at end of study treatment (EOST) as determined by an independent data review committee (DRC). Successful outcome was defined as clearance of Candida from blood cultures with no additional antifungal treatment and survival at EOST. All Candida isolates were tested for antifungal susceptibility. Results A total of 21 subjects were enrolled in the study: 20 were included in the mITT. Median duration of FMGX was 11 days (range 5–14). All subjects received IV FMGX, 48% (10/21) received PO FMGX. The DRC-assessed success rate at EOST was 80% (16/20). Survival at day 30 was 85% (17/20); 3 deaths were not related FMGX. FMGX was well-tolerated with no treatment-related serious adverse events or discontinuations. FMGX had potent in vitro activity against all study Candida spp. (EUCAST MIC range 0.001–0.03 µg/ml) including those resistant to other antifungal agents. Conclusion FMGX was safe, well-tolerated, and demonstrated proof of concept with a high level of treatment success in patients with candidemia. Disclosures Peter Pappas, MD, SCYNEXIS, Inc. (Consultant, Advisor or Review Panel member, Research Grant or Support) Bart Jan Kullberg, MD, FRCP, FIDSA, Amplyx (Advisor or Review Panel member) Galia Rahav, MD, AstraZeneca (Scientific Research Study Investigator) Mickaël Aoun, MD, Amplyx Pharmaceuticals (Scientific Research Study Investigator) Pierre Bulpa, MD, Amplyx Pharmaceuticals (Scientific Research Study Investigator) Ricard Ferrer, MD, PhD, Shionogi B.V. (Advisor or Review Panel member) Todd P. McCarty, MD, Amplyx (Scientific Research Study Investigator)Cidara (Scientific Research Study Investigator) Sara Barbat, BSN, RN, Amplyx Pharmaceuticals (Employee) Pamela Wedel, BSc, Amplyx Pharmaceuticals (Employee) Iwonka Oborska, PhD, Amplyx Pharmaceuticals (Consultant, Independent Contractor) Haran T. Schlamm, MD, Amplyx (Consultant) Michael Hodges, BSc. MD, Amplyx Pharmaceuticals Inc. (Employee)
Collapse
Affiliation(s)
- Peter Pappas
- University of Alabama at Birmingham, Birmingham, Alabama
| | | | - Jose A Vazquez
- Medical College of Georgia at Augusta University, Augusta, Georgia
| | | | - Galia Rahav
- Sheba Medical Center and Tel Aviv University, Ramat Gan, HaMerkaz, Israel
| | - Mickaël Aoun
- Institut Jules Bordet, Brussels, Brussels Hoofdstedelijk Gewest, Belgium
| | - Pierre Bulpa
- Mont-Godinne University Hospital, CHU UCL Namur, Yvoir, Namur, Belgium
| | - Ronen Ben-Ami
- Tel Aviv Sourasky Medical Center, Tel Aviv, Tel Aviv, Israel
| | - Ricard Ferrer
- Vall d’Hebron University Hospital, Barcelona, Catalonia, Spain
| | - Todd P McCarty
- University of Alabama at Birmingham; Birmingham VA Medical Center, Birmingham, Alabama
| | | | - Sara Barbat
- Amplyx Pharmaceutical, San Diego, California
| | | | | | | | | |
Collapse
|
11
|
Hodges M, Sanders G. M562 IT’S NOT SEVERE ATOPIC DERMATITIS! DIAGNOSIS OF PITYRIASIS LICHENOIDES ET VARIOLIFORMIS ACUTA. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
12
|
Baslam M, Mitsui T, Hodges M, Priesack E, Herritt MT, Aranjuelo I, Sanz-Sáez Á. Photosynthesis in a Changing Global Climate: Scaling Up and Scaling Down in Crops. Front Plant Sci 2020; 11:882. [PMID: 32733499 PMCID: PMC7357547 DOI: 10.3389/fpls.2020.00882] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 05/29/2020] [Indexed: 05/06/2023]
Abstract
Photosynthesis is the major process leading to primary production in the Biosphere. There is a total of 7000bn tons of CO2 in the atmosphere and photosynthesis fixes more than 100bn tons annually. The CO2 assimilated by the photosynthetic apparatus is the basis of crop production and, therefore, of animal and human food. This has led to a renewed interest in photosynthesis as a target to increase plant production and there is now increasing evidence showing that the strategy of improving photosynthetic traits can increase plant yield. However, photosynthesis and the photosynthetic apparatus are both conditioned by environmental variables such as water availability, temperature, [CO2], salinity, and ozone. The "omics" revolution has allowed a better understanding of the genetic mechanisms regulating stress responses including the identification of genes and proteins involved in the regulation, acclimation, and adaptation of processes that impact photosynthesis. The development of novel non-destructive high-throughput phenotyping techniques has been important to monitor crop photosynthetic responses to changing environmental conditions. This wealth of data is being incorporated into new modeling algorithms to predict plant growth and development under specific environmental constraints. This review gives a multi-perspective description of the impact of changing environmental conditions on photosynthetic performance and consequently plant growth by briefly highlighting how major technological advances including omics, high-throughput photosynthetic measurements, metabolic engineering, and whole plant photosynthetic modeling have helped to improve our understanding of how the photosynthetic machinery can be modified by different abiotic stresses and thus impact crop production.
Collapse
Affiliation(s)
- Marouane Baslam
- Laboratory of Biochemistry, Faculty of Agriculture, Niigata University, Niigata, Japan
| | - Toshiaki Mitsui
- Laboratory of Biochemistry, Faculty of Agriculture, Niigata University, Niigata, Japan
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRAE, Université Paris-Saclay, Université Evry, Université Paris Diderot, Paris, France
| | - Eckart Priesack
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Matthew T. Herritt
- USDA-ARS Plant Physiology and Genetics Research, US Arid-Land Agricultural Research Center, Maricopa, AZ, United States
| | - Iker Aranjuelo
- Agrobiotechnology Institute (IdAB-CSIC), Consejo Superior de Investigaciones Científicas-Gobierno de Navarra, Mutilva, Spain
| | - Álvaro Sanz-Sáez
- Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, United States
| |
Collapse
|
13
|
Liu Y, Guérard F, Hodges M, Jossier M. Phosphomimetic T335D Mutation of Hydroxypyruvate Reductase 1 Modifies Cofactor Specificity and Impacts Arabidopsis Growth in Air. Plant Physiol 2020; 183:194-205. [PMID: 32156771 PMCID: PMC7210656 DOI: 10.1104/pp.19.01225] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 02/26/2020] [Indexed: 05/13/2023]
Abstract
Photorespiration is an essential process in oxygenic photosynthetic organisms triggered by the oxygenase activity of Rubisco. In peroxisomes, photorespiratory HYDROXYPYRUVATE REDUCTASE1 (HPR1) catalyzes the conversion of hydroxypyruvate to glycerate together with the oxidation of a pyridine nucleotide cofactor. HPR1 regulation remains poorly understood; however, HPR1 phosphorylation at T335 has been reported. By comparing the kinetic properties of phosphomimetic (T335D), nonphosphorylatable (T335A), and wild-type recombinant Arabidopsis (Arabidopsis thaliana) HPR1, it was found that HPR1-T335D exhibits reduced NADH-dependent hydroxypyruvate reductase activity while showing improved NADPH-dependent activity. Complementation of the Arabidopsis hpr1-1 mutant by either wild-type HPR1 or HPR1-T335A fully complemented the photorespiratory growth phenotype of hpr1-1 in ambient air, whereas HPR1-T335D-containing hpr1-1 plants remained smaller and had lower photosynthetic CO2 assimilation rates. Metabolite analyses indicated that these phenotypes were associated with subtle perturbations in the photorespiratory cycle of HPR1-T335D-complemented hpr1-1 rosettes compared to all other HPR1-containing lines. Therefore, T335 phosphorylation may play a role in the regulation of HPR1 activity in planta, although it was not required for growth under ambient air controlled conditions. Furthermore, improved NADP-dependent HPR1 activities in peroxisomes could not compensate for the reduced NADH-dependent HPR1 activity.
Collapse
Affiliation(s)
- Yanpei Liu
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, Institut National de la Recherche Agronomique, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Florence Guérard
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, Institut National de la Recherche Agronomique, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, Institut National de la Recherche Agronomique, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Mathieu Jossier
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, Institut National de la Recherche Agronomique, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| |
Collapse
|
14
|
Jossier M, Liu Y, Massot S, Hodges M. Enzymatic Properties of Recombinant Phospho-Mimetic Photorespiratory Glycolate Oxidases from Arabidopsis thaliana and Zea mays. Plants (Basel) 2019; 9:plants9010027. [PMID: 31878154 PMCID: PMC7020226 DOI: 10.3390/plants9010027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/19/2019] [Accepted: 12/21/2019] [Indexed: 06/10/2023]
Abstract
In photosynthetic organisms, the photorespiratory cycle is an essential pathway leading to the recycling of 2-phosphoglycolate, produced by the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase, to 3-phosphoglycerate. Although photorespiration is a widely studied process, its regulation remains poorly understood. In this context, phosphoproteomics studies have detected six phosphorylation sites associated with photorespiratory glycolate oxidases from Arabidopsis thaliana (AtGOX1 and AtGOX2). Phosphorylation sites at T4, T158, S212 and T265 were selected and studied using Arabidopsis and maize recombinant glycolate oxidase (GOX) proteins mutated to produce either phospho-dead or phospho-mimetic enzymes in order to compare their kinetic parameters. Phospho-mimetic mutations (T4D, T158D and T265D) led to a severe inhibition of GOX activity without altering the KM glycolate. In two cases (T4D and T158D), this was associated with the loss of the cofactor, flavin mononucleotide. Phospho-dead versions exhibited different modifications according to the phospho-site and/or the GOX mutated. Indeed, all T4V and T265A enzymes had kinetic parameters similar to wild-type GOX and all T158V proteins showed low activities while S212A and S212D mutations had no effect on AtGOX1 activity and AtGOX2/ZmGO1 activities were 50% reduced. Taken together, our results suggest that GOX phosphorylation has the potential to modulate GOX activity.
Collapse
|
15
|
Keating XD, Zhou K, Liu X, Hodges M, Liu J, Guan J, Phelps A, Castro-Piñero J. Reliability and Concurrent Validity of Global Physical Activity Questionnaire (GPAQ): A Systematic Review. Int J Environ Res Public Health 2019; 16:ijerph16214128. [PMID: 31717742 PMCID: PMC6862218 DOI: 10.3390/ijerph16214128] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 10/03/2019] [Accepted: 10/10/2019] [Indexed: 11/18/2022]
Abstract
This study aimed to systematically review previous studies on the reliability and concurrent validity of the Global Physical Activity Questionnaire (GPAQ). A systematic literature search was conducted (n = 26) using the online EBSCOHost databases, PubMed, Web of Science, and Google Scholar up to September 2019. A previously developed coding sheet was used to collect the data. The Modified Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies was employed to assess risk of bias and study quality. It was found that GPAQ was primarily revalidated in adult populations in Asian and European countries. The sample size ranged from 43 to 2657 with a wide age range (i.e., 15–79 years old). Different populations yielded inconsistent results concerning the reliability and validity of the GPAQ. Short term (i.e., one- to two-week interval) and long-term (i.e., two- to three-month apart) test–retest reliability was good to very good. The concurrent validity using accelerometers, pedometers, and physical activity (PA) log was poor to fair. The GPAQ data and accelerometer/pedometer/PA log data were not compared using the same measurements in some validation studies. Studies with more rigorous research designs are needed before any conclusions concerning the concurrent validity of GPAQ can be reached.
Collapse
Affiliation(s)
- Xiaofen D. Keating
- Department of Curriculum and Instruction, The University of Texas at Austin, Austin, TX 78712, USA; (X.D.K.); (X.L.); (A.P.)
| | - Ke Zhou
- Institute of Physical Education, and Bioinformatics Center, Henan University, Kaifeng 475001, China
- Correspondence:
| | - Xiaolu Liu
- Department of Curriculum and Instruction, The University of Texas at Austin, Austin, TX 78712, USA; (X.D.K.); (X.L.); (A.P.)
| | - Michael Hodges
- Department of Kinesiology, William Paterson University, Wayne, NJ 07470, USA;
| | - Jingwen Liu
- Department of Kinesiology, California State University, Fullerton, CA 92831, USA;
| | - Jianmin Guan
- Department of Health, Kinesiology, and Nutrition, The University of Texas at San Antonio, San Antonio, TX 78249, USA;
| | - Ashley Phelps
- Department of Curriculum and Instruction, The University of Texas at Austin, Austin, TX 78712, USA; (X.D.K.); (X.L.); (A.P.)
| | - Jose Castro-Piñero
- GALENO research group, Department of Physical Education, Faculty of Education Sciences, University of Cadiz, 11519 Puerto Real, Spain;
| |
Collapse
|
16
|
Liu Y, Mauve C, Lamothe-Sibold M, Guérard F, Glab N, Hodges M, Jossier M. Photorespiratory serine hydroxymethyltransferase 1 activity impacts abiotic stress tolerance and stomatal closure. Plant Cell Environ 2019; 42:2567-2583. [PMID: 31134633 DOI: 10.1111/pce.13595] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/18/2019] [Accepted: 05/21/2019] [Indexed: 05/22/2023]
Abstract
The photorespiratory cycle is a crucial pathway in photosynthetic organisms because it removes toxic 2-phosphoglycolate made by the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase and retrieves its carbon as 3-phosphoglycerate. Mitochondrial serine hydroxymethyltransferase 1 (SHMT1) is an essential photorespiratory enzyme converting glycine to serine. SHMT1 regulation remains poorly understood although it could involve the phosphorylation of serine 31. Here, we report the complementation of Arabidopsis thaliana shm1-1 by SHMT1 wild-type, phosphorylation-mimetic (S31D) or nonphophorylatable (S31A) forms. All SHMT1 forms could almost fully complement the photorespiratory growth phenotype of shm1-1; however, each transgenic line had only 50% of normal SHMT activity. In response to either a salt or drought stress, Compl-S31D lines showed a more severe growth deficiency compared with the other transgenic lines. This sensitivity to salt appeared to reflect reduced SHMT1-S31D protein amounts and a lower activity that impacted leaf metabolism leading to proline underaccumulation and overaccumulation of polyamines. The S31D mutation in SHMT1 also led to a reduction in salt-induced and ABA-induced stomatal closure. Taken together, our results highlight the importance of maintaining photorespiratory SHMT1 activity in salt and drought stress conditions and indicate that SHMT1 S31 phosphorylation could be involved in modulating SHMT1 protein stability.
Collapse
Affiliation(s)
- Yanpei Liu
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Caroline Mauve
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Marlène Lamothe-Sibold
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Florence Guérard
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Nathalie Glab
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| | - Mathieu Jossier
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay Cedex, 91405, France
| |
Collapse
|
17
|
Hao J, Pétriacq P, de Bont L, Hodges M, Gakière B. Characterization of l-aspartate oxidase from Arabidopsis thaliana. Plant Sci 2018; 271:133-142. [PMID: 29650151 DOI: 10.1016/j.plantsci.2018.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/15/2018] [Accepted: 03/16/2018] [Indexed: 06/08/2023]
Abstract
The flavoprotein l-aspartate oxidase (LASPO) is the first enzyme of the de novo biosynthetic pathway of NAD+ in plants. Although LASPO is considered pivotal to maintain NAD+ homeostasis, it has not been hitherto characterized in plants. Here, the cDNA encoding the LASPO from the model plant Arabidopsis thaliana (AtLASPO, At5g14760) has been cloned and expressed in Escherichia coli for subsequent enzyme characterization. The purified AtLASPO enzyme displayed a Km of 0.79 mM for l-aspartate and a kcat of 0.25 s-1. We could further detect an l-aspartate: fumarate oxidoreductase activity of the recombinant plant enzyme. In addition, results indicated that NADP+ but not NAD+, and even more strongly NADH, inhibited AtLASPO at physiological concentrations by competing with the flavin for binding to the apoprotein. LASPO optimal pH and temperature, as well as plastidial pyridine nucleotide concentrations may contribute to an increased NAD+ production in planta. Moreover, in Arabidopsis thaliana AtLASPO gene expression exhibited a clear correlation between LASPO activity and NAD+ levels, thus demonstrating that plant LASPO catalyzes a key metabolic step of NAD+ synthesis.
Collapse
Affiliation(s)
- Jingfang Hao
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France
| | - Pierre Pétriacq
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France; UMR 1332 Biologie du Fruit et Pathologie, INRA, 33883, Villenave d'Ornon, France
| | - Linda de Bont
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France
| | - Bertrand Gakière
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France; Plateforme Métabolisme Métabolome, Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRA, Univ. Paris-Sud, Univ. Evry, Univ. Paris-Diderot, Université Paris-Saclay, Bâtiment 630, Rue Noetzlin, 91192, Gif-sur-Yvette cedex, France.
| |
Collapse
|
18
|
Glab N, Oury C, Guérinier T, Domenichini S, Crozet P, Thomas M, Vidal J, Hodges M. The impact of Arabidopsis thaliana SNF1-related-kinase 1 (SnRK1)-activating kinase 1 (SnAK1) and SnAK2 on SnRK1 phosphorylation status: characterization of a SnAK double mutant. Plant J 2017; 89:1031-1041. [PMID: 27943466 DOI: 10.1111/tpj.13445] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 11/14/2016] [Indexed: 05/20/2023]
Abstract
Arabidopsis thaliana SNF1-related-kinase 1 (SnRK1)-activating kinase 1 (AtSnAK1) and AtSnAK2 have been shown to phosphorylate in vitro and activate the energy signalling integrator, SnRK1. To clarify this signalling cascade in planta, a genetic- and molecular-based approach was developed. Homozygous single AtSnAK1 and AtSnAK2 T-DNA insertional mutants did not display an apparent phenotype. Crossing of the single mutants did not allow the isolation of double-mutant plants, whereas self-pollinating the S1-/- S2+/- sesquimutant specifically gave approximatively 22% individuals in their offspring that, when rescued on sugar-supplemented media in vitro, were shown to be AtSnAK1 AtSnAK2 double mutants. Interestingly, this was not obtained in the case of the other sesquimutant, S1+/- S2-/-. Although reduced in size, the double mutant had the capacity to produce flowers, but not seeds. Immunological characterization established the T-loop of the SnRK1 catalytic subunit to be non-phosphorylated in the absence of both SnAKs. When the double mutant was complemented with a DNA construct containing an AtSnAK2 open reading frame driven by its own promoter, a normal phenotype was restored. Therefore, wild-type plant growth and development is dependent on the presence of SnAK in vivo, and this is correlated with SnRK1 phosphorylation. These data show that both SnAKs are kinases phosphorylating SnRK1, and thereby they contribute to energy signalling in planta.
Collapse
Affiliation(s)
- Nathalie Glab
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Céline Oury
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Thomas Guérinier
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Séverine Domenichini
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Pierre Crozet
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Martine Thomas
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Jean Vidal
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Université Paris-Saclay, Bâtiment 630, 91405, Orsay Cedex, France
| |
Collapse
|
19
|
Dyer B, Zhao X, Hoffman D, Kahn L, Hodges M, Hayes J, Michaud A, Hess C, Kumaran Nair C, Fragoso R, Valicenti R, Mayadev J. Mortality in Radiation Oncology: A 16-Year Departmental Review. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
20
|
Hodges M, Barzilov A, Chen Y, Lowe D. Characterization of the radiation environment at the UNLV accelerator facility during operation of the Varian M6 linac. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2016.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
21
|
Abadie C, Mainguet S, Davanture M, Hodges M, Zivy M, Tcherkez G. Concerted Changes in the Phosphoproteome and Metabolome Under Different CO2/O2 Gaseous Conditions in Arabidopsis Rosettes. Plant Cell Physiol 2016; 57:1544-1556. [PMID: 27903807 DOI: 10.1093/pcp/pcw086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 04/21/2016] [Indexed: 06/06/2023]
Abstract
Considerable efforts are currently devoted to understanding the regulation of primary carbon metabolism in plant leaves, which is known to change dramatically with environmental conditions, e.g. during light/dark transitions. Protein phosphorylation is believed to be a key factor in such a metabolic control. In fact, some studies have suggested modifications in the phosphorylation status of key enzymes in the dark compared with the light, or when photosynthesis varies. However, a general view of the phosphoproteome and reciprocal alterations in both the phosphoproteome and metabolome under a wide spectrum of CO2 and O2 conditions so as to vary both gross photosynthesis and photorespiration is currently lacking. Here, we used an instant sampling system and strictly controlled gaseous conditions to examine short-term metabolome and phosphoproteome changes in Arabidopsis rosettes. We show that light/dark, CO2 and O2 mole fraction have differential effects on enzyme phosphorylation. Phosphorylation events that appear to be the most important to regulate metabolite contents when photosynthesis varies are those associated with sugar and pyruvate metabolism: sucrose and starch synthesis are major phosphorylation-controlled steps but pyruvate utilization (by phosphoenolpyruvate carboxylase and pyruvate dehydrogenase) and pyruvate reformation (by pyruvate orthophosphate dikinase) are also subjected to phosphorylation control. Our results thus show that the phosphoproteome response to light/dark transition and gaseous conditions (CO2, O2) contributes to the rapid adjustment of major pathways of primary C metabolism.
Collapse
Affiliation(s)
- Cyril Abadie
- Research School of Biology, College of Medicine, Biology and Environment, Australian National University, Canberra ACT 2601, Australia
- These authors contributed equally to this work
| | - Samuel Mainguet
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, Université Paris Sud, CNRS-INRA, Université d'Evry, Université Paris-Diderot, Bâtiment 630, 91405 Orsay Cedex, France
- These authors contributed equally to this work
| | - Marlène Davanture
- Plateforme PAPPSO, UMR 0320/8120 Génétique Quantitative et Evolution, Université Paris-Sud, CNRS-INRA-AgroParisTech, Le Moulon, 91190 Gif-sur-Yvette, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, Université Paris Sud, CNRS-INRA, Université d'Evry, Université Paris-Diderot, Bâtiment 630, 91405 Orsay Cedex, France
| | - Michel Zivy
- Plateforme PAPPSO, UMR 0320/8120 Génétique Quantitative et Evolution, Université Paris-Sud, CNRS-INRA-AgroParisTech, Le Moulon, 91190 Gif-sur-Yvette, France
| | - Guillaume Tcherkez
- Research School of Biology, College of Medicine, Biology and Environment, Australian National University, Canberra ACT 2601, Australia
| |
Collapse
|
22
|
Dellero Y, Jossier M, Glab N, Oury C, Tcherkez G, Hodges M. Decreased glycolate oxidase activity leads to altered carbon allocation and leaf senescence after a transfer from high CO2 to ambient air in Arabidopsis thaliana. J Exp Bot 2016; 67:3149-63. [PMID: 26896850 DOI: 10.1093/jxb/erw054] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Metabolic and physiological analyses of Arabidopsis thaliana glycolate oxidase (GOX) mutant leaves were performed to understand the development of the photorespiratory phenotype after transfer from high CO2 to air. We show that two Arabidopsis genes, GOX1 and GOX2, share a redundant photorespiratory role. Air-grown single gox1 and gox2 mutants grew normally and no significant differences in leaf metabolic levels and photosynthetic activities were found when compared with wild-type plants. To study the impact of a highly reduced GOX activity on plant metabolism, both GOX1 and GOX2 expression was knocked-down using an artificial miRNA strategy. Air-grown amiRgox1/2 plants with a residual 5% GOX activity exhibited a severe growth phenotype. When high-CO2-grown adult plants were transferred to air, the photosynthetic activity of amiRgox1/2 was rapidly reduced to 50% of control levels, and a high non-photochemical chlorophyll fluorescence quenching was maintained. (13)C-labeling revealed that daily assimilated carbon accumulated in glycolate, leading to reduced carbon allocation to sugars, organic acids, and amino acids. Such changes were not always mirrored in leaf total metabolite levels, since many soluble amino acids increased after transfer, while total soluble protein, RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase), and chlorophyll amounts decreased in amiRgox1/2 plants. The senescence marker, SAG12, was induced only in amiRgox1/2 rosettes after transfer to air. The expression of maize photorespiratory GOX in amiRgox1/2 abolished all observed phenotypes. The results indicate that the inhibition of the photorespiratory cycle negatively impacts photosynthesis, alters carbon allocation, and leads to early senescence in old rosette leaves.
Collapse
Affiliation(s)
- Younès Dellero
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Mathieu Jossier
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Nathalie Glab
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Céline Oury
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Guillaume Tcherkez
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d'Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay Cedex, France
| |
Collapse
|
23
|
Abstract
Photorespiration is one of the major carbon metabolism pathways in oxygen-producing photosynthetic organisms. This pathway recycles 2-phosphoglycolate (2-PG), a toxic metabolite, to 3-phosphoglycerate when ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) uses oxygen instead of carbon dioxide. The photorespiratory cycle is in competition with photosynthetic CO2 fixation and it is accompanied by carbon, nitrogen and energy losses. Thus, photorespiration has become a target to improve crop yields. Moreover, during the photorespiratory cycle intermediate metabolites that are toxic to Calvin-Benson cycle and RuBisCO activities, such as 2-PG, glycolate and glyoxylate, are produced. Thus, the presence of an efficient 2-PG/glycolate/glyoxylate 'detoxification' pathway is required to ensure normal development of photosynthetic organisms. Here we review our current knowledge concerning the enzymes that carry out the glycolate-glyoxylate metabolic steps of photorespiration from glycolate production in the chloroplasts to the synthesis of glycine in the peroxisomes. We describe the properties of the proteins involved in glycolate-glyoxylate metabolism in Archaeplastida and the phenotypes observed when knocking down/out these specific photorespiratory players. Advances in our understanding of the regulation of glycolate-glyoxylate metabolism are highlighted.
Collapse
Affiliation(s)
- Younès Dellero
- Institut of Plant Sciences Paris-Saclay, Université Paris-Sud, CNRS, INRA, Université d'Evry, Université Paris Diderot, Université Paris-Saclay, Bât 630, 91405 Orsay Cedex, France
| | - Mathieu Jossier
- Institut of Plant Sciences Paris-Saclay, Université Paris-Sud, CNRS, INRA, Université d'Evry, Université Paris Diderot, Université Paris-Saclay, Bât 630, 91405 Orsay Cedex, France
| | - Jessica Schmitz
- Institute of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, and Cluster of Excellence on Plant Sciences (CEPLAS), Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Veronica G Maurino
- Institute of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, and Cluster of Excellence on Plant Sciences (CEPLAS), Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Michael Hodges
- Institut of Plant Sciences Paris-Saclay, Université Paris-Sud, CNRS, INRA, Université d'Evry, Université Paris Diderot, Université Paris-Saclay, Bât 630, 91405 Orsay Cedex, France
| |
Collapse
|
24
|
Hodges M, Dellero Y, Keech O, Betti M, Raghavendra AS, Sage R, Zhu XG, Allen DK, Weber APM. Perspectives for a better understanding of the metabolic integration of photorespiration within a complex plant primary metabolism network. J Exp Bot 2016; 67:3015-26. [PMID: 27053720 DOI: 10.1093/jxb/erw145] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Photorespiration is an essential high flux metabolic pathway that is found in all oxygen-producing photosynthetic organisms. It is often viewed as a closed metabolic repair pathway that serves to detoxify 2-phosphoglycolic acid and to recycle carbon to fuel the Calvin-Benson cycle. However, this view is too simplistic since the photorespiratory cycle is known to interact with several primary metabolic pathways, including photosynthesis, nitrate assimilation, amino acid metabolism, C1 metabolism and the Krebs (TCA) cycle. Here we will review recent advances in photorespiration research and discuss future priorities to better understand (i) the metabolic integration of the photorespiratory cycle within the complex network of plant primary metabolism and (ii) the importance of photorespiration in response to abiotic and biotic stresses.
Collapse
Affiliation(s)
- Michael Hodges
- Institute of Plant Sciences Paris-Saclay, Université Paris-Sud, CNRS, INRA, Université d'Evry, 91405 Orsay Cedex, France
| | - Younès Dellero
- Institute of Plant Sciences Paris-Saclay, Université Paris-Sud, CNRS, INRA, Université d'Evry, 91405 Orsay Cedex, France
| | - Olivier Keech
- Department of Plant Physiology, Umeå Plant Science Centre, Umeå University, SE-90187 Umeå, Sweden
| | - Marco Betti
- Departamento de Bioquímica Vegetal y Biología Molecular, Facultad de Química, Universidad de Sevilla, 141012 Sevilla, Spain
| | - Agepati S Raghavendra
- School of Life Sciences, Department of Plant Sciences, University of Hyderabad, Hyderabad 500046, India
| | - Rowan Sage
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S3B2, Canada
| | - Xin-Guang Zhu
- CAS-MPG Partner Institutes for Computational Biology, Shanghai Institutes for Biological Sciences, CAS, Shanghai 200031, China
| | - Doug K Allen
- United States Department of Agriculture-Agricultural Research Service, Plant Genetics Research Unit, Donald Danforth Plant Science Center, St Louis, MO 63132, USA
| | - Andreas P M Weber
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-Universität, Universitätsstraße 1, and Cluster of Excellence on Plant Sciences, 40225 Düsseldorf, Germany
| |
Collapse
|
25
|
Kahn L, Hodges M, Hayes J, Daly M. Detection and Treatment of Second Primary Lung Cancers Following Initial Stereotactic Body Radiation Therapy for Early-Stage Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
26
|
Abstract
Summary
Study aim: this study examined the item difficulty and item discrimination scores for the HRFK PE Metrics cognitive assessment tool for 5th-grade students.
Materials and methods: ten elementary physical education teachers volunteered to participate. Based on convenience, participating teachers selected two 5th grade physical education classes. Teachers then gave students (N = 633) a 28-question paper and pencil HRFK exam using PE Metrics Standards 3 and 4. Item difficulty and discrimination analysis and Rasch Modeling were used data to determine underperforming items.
Results: analysis suggests that at least three items are problematic. The Rasch Model confirmed this result and identified similar items with high outfit mean square values and low Point Biserial correlation values.
Conclusions: teachers are in need of valid and reliable HRFK assessment tools. Without the removal of three items in the PE Metrics HRFK exam for 5th-grade students, complete use of the exam could offer incorrect conclusions.
Collapse
Affiliation(s)
| | - Chong Lee
- Arizona State University, Phoenix, Arizona, USA
| | | | - Daniel Cipriani
- Chapman University, One University Drive Orange, California, USA
| |
Collapse
|
27
|
Dellero Y, Lamothe-Sibold M, Jossier M, Hodges M. Arabidopsis thaliana ggt1 photorespiratory mutants maintain leaf carbon/nitrogen balance by reducing RuBisCO content and plant growth. Plant J 2015. [PMID: 26216646 DOI: 10.1111/tpj.12945] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Metabolic and physiological analyses of glutamate:glyoxylate aminotransferase 1 (GGT1) mutants were performed at the global leaf scale to elucidate the mechanisms involved in their photorespiratory growth phenotype. Air-grown ggt1 mutants showed retarded growth and development, that was not observed at high CO2 (3000 μL L(-1) ). When compared to wild-type (WT) plants, air-grown ggt1 plants exhibited glyoxylate accumulation, global changes in amino acid amounts including a decrease in serine content, lower organic acid levels, and modified ATP/ADP and NADP(+) /NADPH ratios. When compared to WT plants, their net CO2 assimilation rates (An ) were 50% lower and this mirrored decreases in ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) contents. High CO2 -grown ggt1 plants transferred to air revealed a rapid decrease of An and photosynthetic electron transfer rate while maintaining a high energetic state. Short-term (a night period and 4 h of light) transferred ggt1 leaves accumulated glyoxylate and exhibited low serine contents, while other amino acid levels were not modified. RuBisCO content, activity and activation state were not altered after a short-term transfer while the ATP/ADP ratio was lowered in ggt1 rosettes. However, plant growth and RuBisCO levels were both reduced in ggt1 leaves after a long-term (12 days) acclimation to air from high CO2 when compared to WT plants. The data are discussed with respect to a reduced photorespiratory carbon recycling in the mutants. It is proposed that the low An limits nitrogen-assimilation, this decreases leaf RuBisCO content until plants attain a new homeostatic state that maintains a constant C/N balance and leads to smaller, slower growing plants.
Collapse
Affiliation(s)
- Younès Dellero
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, CNRS/INRA, Université Paris Sud, Université d'Evry, Université Paris-Diderot, Bâtiment 630, Orsay Cedex, 91405, France
| | - Marlène Lamothe-Sibold
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, CNRS/INRA, Université Paris Sud, Université d'Evry, Université Paris-Diderot, Bâtiment 630, Orsay Cedex, 91405, France
| | - Mathieu Jossier
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, CNRS/INRA, Université Paris Sud, Université d'Evry, Université Paris-Diderot, Bâtiment 630, Orsay Cedex, 91405, France
| | - Michael Hodges
- Institute of Plant Sciences Paris-Saclay, UMR 9213/UMR1403, CNRS/INRA, Université Paris Sud, Université d'Evry, Université Paris-Diderot, Bâtiment 630, Orsay Cedex, 91405, France
| |
Collapse
|
28
|
Dellero Y, Mauve C, Boex-Fontvieille E, Flesch V, Jossier M, Tcherkez G, Hodges M. Experimental evidence for a hydride transfer mechanism in plant glycolate oxidase catalysis. J Biol Chem 2014; 290:1689-98. [PMID: 25416784 DOI: 10.1074/jbc.m114.618629] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In plants, glycolate oxidase is involved in the photorespiratory cycle, one of the major fluxes at the global scale. To clarify both the nature of the mechanism and possible differences in glycolate oxidase enzyme chemistry from C3 and C4 plant species, we analyzed kinetic parameters of purified recombinant C3 (Arabidopsis thaliana) and C4 (Zea mays) plant enzymes and compared isotope effects using natural and deuterated glycolate in either natural or deuterated solvent. The (12)C/(13)C isotope effect was also investigated for each plant glycolate oxidase protein by measuring the (13)C natural abundance in glycolate using natural or deuterated glycolate as a substrate. Our results suggest that several elemental steps were associated with an hydrogen/deuterium isotope effect and that glycolate α-deprotonation itself was only partially rate-limiting. Calculations of commitment factors from observed kinetic isotope effect values support a hydride transfer mechanism. No significant differences were seen between C3 and C4 enzymes.
Collapse
Affiliation(s)
- Younès Dellero
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France
| | - Caroline Mauve
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France, Plateforme Métabolisme-Métabolome, Saclay Plant Sciences, Institut de Biologie des Plantes, Bâtiment 630, 91405 Orsay Cedex, France, and
| | - Edouard Boex-Fontvieille
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France
| | - Valérie Flesch
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France
| | - Mathieu Jossier
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France
| | - Guillaume Tcherkez
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France, Plateforme Métabolisme-Métabolome, Saclay Plant Sciences, Institut de Biologie des Plantes, Bâtiment 630, 91405 Orsay Cedex, France, and Institut Universitaire de France, 103 Boulevard Saint-Michel, 75005 Paris, France
| | - Michael Hodges
- From the Institut de Biologie des Plantes, CNRS UMR8618, Saclay Plant Sciences, Bâtiment 630, Université Paris Sud, 91405 Orsay Cedex, France,
| |
Collapse
|
29
|
Boex-Fontvieille E, Davanture M, Jossier M, Zivy M, Hodges M, Tcherkez G. Photosynthetic activity influences cellulose biosynthesis and phosphorylation of proteins involved therein in Arabidopsis leaves. J Exp Bot 2014; 65:4997-5010. [PMID: 25039072 DOI: 10.1093/jxb/eru268] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Cellulose is one of the most important organic compounds in terrestrial ecosystems and represents a major plant structural polymer. However, knowledge of the regulation of cellulose biosynthesis is still rather limited. Recent studies have shown that the phosphorylation of cellulose synthases (CESAs) may represent a key regulatory event in cellulose production. However, the impact of environmental conditions on the carbon flux of cellulose deposition and on phosphorylation levels of CESAs has not been fully elucidated. Here, we took advantage of gas exchange measurements, isotopic techniques, metabolomics, and quantitative phosphoproteomics to investigate the regulation of cellulose production in Arabidopsis rosette leaves in different photosynthetic contexts (different CO2 mole fractions) or upon light/dark transition. We show that the carbon flux to cellulose production increased with photosynthesis, but not proportionally. The phosphorylation level of several phosphopeptides associated with CESA1 and 3, and several enzymes of sugar metabolism was higher in the light and/or increased with photosynthesis. By contrast, a phosphopeptide (Ser126) associated with CESA5 seemed to be more phosphorylated in the dark. Our data suggest that photosynthetic activity affects cellulose deposition through the control of both sucrose metabolism and cellulose synthesis complexes themselves by protein phosphorylation.
Collapse
Affiliation(s)
- Edouard Boex-Fontvieille
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris Sud, 91405 Orsay cedex, France
| | - Marlène Davanture
- Plateforme PAPPSO, UMR de Génétique Végétale, Ferme du Moulon, 91190 Gif sur Yvette, France
| | - Mathieu Jossier
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris Sud, 91405 Orsay cedex, France
| | - Michel Zivy
- Plateforme PAPPSO, UMR de Génétique Végétale, Ferme du Moulon, 91190 Gif sur Yvette, France
| | - Michael Hodges
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris Sud, 91405 Orsay cedex, France
| | - Guillaume Tcherkez
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris Sud, 91405 Orsay cedex, France Institut Universitaire de France, 103 Boulevard Saint-Michel, 75005 Paris, France
| |
Collapse
|
30
|
Boex-Fontvieille E, Daventure M, Jossier M, Hodges M, Zivy M, Tcherkez G. Phosphorylation pattern of Rubisco activase in Arabidopsis leaves. Plant Biol (Stuttg) 2014. [PMID: 24119201 DOI: 10.1111/plb.12100mid:24119201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Rubisco activase (RCA) is an ancillary photosynthetic protein essential for Rubisco activity. Some data suggest that post-translational modifications (such as reduction of disulphide bridges) are involved in the regulation of RCA activity. However, despite the key role of protein phosphorylation in general metabolic regulation, RCA phosphorylation has not been well characterised. We took advantage of phosphoproteomics and gas exchange analyses with instant sampling adapted to Arabidopsis rosettes to examine the occurrence and variations of phosphopeptides associated with RCA in different photosynthetic contexts (CO2 mole fraction, light and dark). We detected two phosphopeptides from RCA corresponding to residues Thr 78 and Ser 172, and show that the former is considerably more phosphorylated in the dark than in the light, while the latter show no light/dark pattern. The CO2 mole fraction did not influence phosphorylation of either residue. Phosphorylation thus appears to be a potential mechanism associated with RCA dark inactivation, when Rubisco-catalysed carboxylation is arrested. Since Thr 78 and Ser 172 are located in the N and Walker domains of the protein, respectively, the involvement of phosphorylation in protein-protein interaction and catalysis is likely.
Collapse
Affiliation(s)
- E Boex-Fontvieille
- Institut de biologie des plantes, CNRS UMR 8618, Université Paris-Sud, Orsay, France
| | | | | | | | | | | |
Collapse
|
31
|
Boex-Fontvieille E, Daventure M, Jossier M, Hodges M, Zivy M, Tcherkez G. Phosphorylation pattern of Rubisco activase in Arabidopsis leaves. Plant Biol (Stuttg) 2014; 16:550-7. [PMID: 24119201 DOI: 10.1111/plb.12100] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 07/20/2013] [Indexed: 05/09/2023]
Abstract
Rubisco activase (RCA) is an ancillary photosynthetic protein essential for Rubisco activity. Some data suggest that post-translational modifications (such as reduction of disulphide bridges) are involved in the regulation of RCA activity. However, despite the key role of protein phosphorylation in general metabolic regulation, RCA phosphorylation has not been well characterised. We took advantage of phosphoproteomics and gas exchange analyses with instant sampling adapted to Arabidopsis rosettes to examine the occurrence and variations of phosphopeptides associated with RCA in different photosynthetic contexts (CO2 mole fraction, light and dark). We detected two phosphopeptides from RCA corresponding to residues Thr 78 and Ser 172, and show that the former is considerably more phosphorylated in the dark than in the light, while the latter show no light/dark pattern. The CO2 mole fraction did not influence phosphorylation of either residue. Phosphorylation thus appears to be a potential mechanism associated with RCA dark inactivation, when Rubisco-catalysed carboxylation is arrested. Since Thr 78 and Ser 172 are located in the N and Walker domains of the protein, respectively, the involvement of phosphorylation in protein-protein interaction and catalysis is likely.
Collapse
Affiliation(s)
- E Boex-Fontvieille
- Institut de biologie des plantes, CNRS UMR 8618, Université Paris-Sud, Orsay, France
| | | | | | | | | | | |
Collapse
|
32
|
Martino P, Olesiak S, Riley D, Neumueller S, Forster H, Hodges M. Numbers of pH‐sensitive K
+
channel‐immunoreactive neurons are reduced in CO
2
‐insensitive Brown Norway rats in select brainstem nuclei associated with central respiratory chemoreception (1092.8). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1092.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- P Martino
- Biology Department Carthage CollegeKenoshaWIUnited States
| | - S Olesiak
- Department of Physiology Medical College of WisconsinMIlwaukeeWIUnited States
| | - D Riley
- Department of Physiology Medical College of WisconsinMIlwaukeeWIUnited States
| | - S Neumueller
- Department of Physiology Medical College of WisconsinMIlwaukeeWIUnited States
| | - H Forster
- Department of Physiology Medical College of WisconsinMIlwaukeeWIUnited States
- Zablocki VA Medical CenterMIlwaukeeWIUnited States
| | - M Hodges
- Department of Physiology Medical College of WisconsinMIlwaukeeWIUnited States
| |
Collapse
|
33
|
Miller J, Neumueller S, Muere C, Olesiak S, Daghistany A, Pan L, Hodges M, Forster H. Increased Ca
2+
permeable ampa receptor expression following carotid body denervation in goats (713.2). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.713.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Justin Miller
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
- Anesthesiology VA Medical CenterMIlwaukeeWIUnited States
| | - S Neumueller
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - C Muere
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - S Olesiak
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - A Daghistany
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - L Pan
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - M Hodges
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| | - H Forster
- Physiology Medical College of Wisconsin Wauwatosa WIUnited States
| |
Collapse
|
34
|
Guérinier T, Millan L, Crozet P, Oury C, Rey F, Valot B, Mathieu C, Vidal J, Hodges M, Thomas M, Glab N. Phosphorylation of p27(KIP1) homologs KRP6 and 7 by SNF1-related protein kinase-1 links plant energy homeostasis and cell proliferation. Plant J 2013; 75:515-25. [PMID: 23617622 DOI: 10.1111/tpj.12218] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 03/08/2013] [Accepted: 04/22/2013] [Indexed: 05/23/2023]
Abstract
SNF1-related protein kinase-1 (SnRK1), the plant kinase homolog of mammalian AMP-activated protein kinase (AMPK), is a sensor that maintains cellular energy homeostasis via control of anabolism/catabolism balance. AMPK-dependent phosphorylation of p27(KIP1) affects cell-cycle progression, autophagy and apoptosis. Here, we show that SnRK1 phosphorylates the Arabidopsis thaliana cyclin-dependent kinase inhibitor p27(KIP1) homologs AtKRP6 and AtKRP7, thus extending the role of this kinase to regulation of cell-cycle progression. AtKRP6 and 7 were phosphorylated in vitro by a recombinant activated catalytic subunit of SnRK1 (AtSnRK1α1). Tandem mass spectrometry and site-specific mutagenesis identified Thr152 and Thr151 as the phosphorylated residues on AtKRP6- and AtKRP7, respectively. AtSnRK1 physically interacts with AtKRP6 in the nucleus of transformed BY-2 tobacco protoplasts, but, in contrast to mammals, the AtKRP6 Thr152 phosphorylation state alone did not modify its nuclear localization. Using a heterologous yeast system, consisting of a cdc28 yeast mutant complemented by A. thaliana CDKA;1, cell proliferation was shown to be abolished by AtKRP6(WT) and by the non-phosphorylatable form AtKRP6(T152A) , but not by the phosphorylation-mimetic form AtKRP6(T152D). Moreover, A. thaliana SnRK1α1/KRP6 double over-expressor plants showed an attenuated AtKRP6-associated phenotype (strongly serrated leaves and inability to undergo callogenesis). Furthermore, this severe phenotype was not observed in AtKRP6(T152D) over-expressor plants. Overall, these results establish that the energy sensor AtSnRK1 plays a cardinal role in the control of cell proliferation in A. thaliana plants through inhibition of AtKRP6 biological function by phosphorylation.
Collapse
Affiliation(s)
- Thomas Guérinier
- Institut de Biologie des Plantes, Centre National de la Recherche Scientifique Unité Mixte de Recherche 8618, Bâtiment 630, Université Paris-Sud, Saclay Plant Sciences, Orsay Cedex 91405, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Boex-Fontvieille ERA, Gauthier PPG, Gilard F, Hodges M, Tcherkez GGB. A new anaplerotic respiratory pathway involving lysine biosynthesis in isocitrate dehydrogenase-deficient Arabidopsis mutants. New Phytol 2013; 199:673-82. [PMID: 23718121 DOI: 10.1111/nph.12319] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 04/07/2013] [Indexed: 05/11/2023]
Abstract
The cornerstone of carbon (C) and nitrogen (N) metabolic interactions - respiration - is presently not well understood in plant cells: the source of the key intermediate 2-oxoglutarate (2OG), to which reduced N is combined to yield glutamate and glutamine, remains somewhat unclear. We took advantage of combined mutations of NAD- and NADP-dependent isocitrate dehydrogenase activity and investigated the associated metabolic effects in Arabidopsis leaves (the major site of N assimilation in this genus), using metabolomics and (13)C-labelling techniques. We show that a substantial reduction in leaf isocitrate dehydrogenase activity did not lead to changes in the respiration efflux rate but respiratory metabolism was reorchestrated: 2OG production was supplemented by a metabolic bypass involving both lysine synthesis and degradation. Although the recycling of lysine has long been considered important in sustaining respiration, we show here that lysine neosynthesis itself participates in an alternative respiratory pathway. Lys metabolism thus contributes to explaining the metabolic flexibility of plant leaves and the effect (or the lack thereof) of respiratory mutations.
Collapse
|
36
|
Boex-Fontvieille E, Daventure M, Jossier M, Zivy M, Hodges M, Tcherkez G. Photosynthetic control of Arabidopsis leaf cytoplasmic translation initiation by protein phosphorylation. PLoS One 2013; 8:e70692. [PMID: 23894680 PMCID: PMC3722150 DOI: 10.1371/journal.pone.0070692] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 06/20/2013] [Indexed: 01/26/2023] Open
Abstract
Photosynthetic CO2 assimilation is the carbon source for plant anabolism, including amino acid production and protein synthesis. The biosynthesis of leaf proteins is known for decades to correlate with photosynthetic activity but the mechanisms controlling this effect are not documented. The cornerstone of the regulation of protein synthesis is believed to be translation initiation, which involves multiple phosphorylation events in Eukaryotes. We took advantage of phosphoproteomic methods applied to Arabidopsis thaliana rosettes harvested under controlled photosynthetic gas-exchange conditions to characterize the phosphorylation pattern of ribosomal proteins (RPs) and eukaryotic initiation factors (eIFs). The analyses detected 14 and 11 new RP and eIF phosphorylation sites, respectively, revealed significant CO2-dependent and/or light/dark phosphorylation patterns and showed concerted changes in 13 eIF phosphorylation sites and 9 ribosomal phosphorylation sites. In addition to the well-recognized role of the ribosomal small subunit protein RPS6, our data indicate the involvement of eIF3, eIF4A, eIF4B, eIF4G and eIF5 phosphorylation in controlling translation initiation when photosynthesis varies. The response of protein biosynthesis to the photosynthetic input thus appears to be the result of a complex regulation network involving both stimulating (e.g. RPS6, eIF4B phosphorylation) and inhibiting (e.g. eIF4G phosphorylation) molecular events.
Collapse
Affiliation(s)
- Edouard Boex-Fontvieille
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris-Sud, Orsay, France
| | - Marlène Daventure
- Plateforme PAPPSO, UMR de Génétique Végétale, Ferme du Moulon, Gif sur Yvette, France
| | - Mathieu Jossier
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris-Sud, Orsay, France
| | - Michel Zivy
- Plateforme PAPPSO, UMR de Génétique Végétale, Ferme du Moulon, Gif sur Yvette, France
| | - Michael Hodges
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris-Sud, Orsay, France
| | - Guillaume Tcherkez
- Institut de Biologie des Plantes, CNRS UMR 8618, Saclay Plant Sciences, Université Paris-Sud, Orsay, France
- Institut Universitaire de France, Paris, France
| |
Collapse
|
37
|
Hodges M, Jossier M, Boex-Fontvieille E, Tcherkez G. Protein phosphorylation and photorespiration. Plant Biol (Stuttg) 2013; 15:694-706. [PMID: 23506267 DOI: 10.1111/j.1438-8677.2012.00719.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Accepted: 11/06/2012] [Indexed: 05/08/2023]
Abstract
Photorespiration allows the recycling of carbon atoms of 2-phosphoglycolate produced by ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) oxygenase activity, as well as the removal of potentially toxic metabolites. The photorespiratory pathway takes place in the light, encompasses four cellular compartments and interacts with several other metabolic pathways and functions. Therefore, the regulation of this cycle is probably of paramount importance to plant metabolism, however, our current knowledge is poor. To rapidly respond to changing conditions, proteins undergo a number of different post-translational modifications that include acetylation, methylation and ubiquitylation, but protein phosphorylation is probably the most common. The reversible covalent addition of a phosphate group to a specific amino acid residue allows the modulation of protein function, such as activity, subcellular localisation, capacity to interact with other proteins and stability. Recent data indicate that many photorespiratory enzymes can be phosphorylated, and thus it seems that the photorespiratory cycle is, in part, regulated by protein phosphorylation. In this review, the known phosphorylation sites of each Arabidopsis thaliana photorespiratory enzyme and several photorespiratory-associated proteins are described and discussed. A brief account of phosphoproteomic protocols is also given since the published data compiled in this review are the fruit of this approach.
Collapse
Affiliation(s)
- M Hodges
- Institut de Biologie des Plantes, Saclay Plant Sciences, Université Paris Sud, Orsay Cedex, France.
| | | | | | | |
Collapse
|
38
|
Gauthier PPG, Lamothe M, Mahé A, Molero G, Nogués S, Hodges M, Tcherkez G. Metabolic origin of δ15 N values in nitrogenous compounds from Brassica napus L. leaves. Plant Cell Environ 2013; 36:128-37. [PMID: 22709428 DOI: 10.1111/j.1365-3040.2012.02561.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Nitrogen isotope composition (δ(15) N) in plant organic matter is currently used as a natural tracer of nitrogen acquisition efficiency. However, the δ(15) N value of whole leaf material does not properly reflect the way in which N is assimilated because isotope fractionations along metabolic reactions may cause substantial differences among leaf compounds. In other words, any change in metabolic composition or allocation pattern may cause undesirable variability in leaf δ(15) N. Here, we investigated the δ(15) N in different leaf fractions and individual metabolites from rapeseed (Brassica napus) leaves. We show that there were substantial differences in δ(15) N between nitrogenous compounds (up to 30‰) and the content in ((15) N enriched) nitrate had a clear influence on leaf δ(15) N. Using a simple steady-state model of day metabolism, we suggest that the δ(15) N value in major amino acids was mostly explained by isotope fractionation associated with isotope effects on enzyme-catalysed reactions in primary nitrogen metabolism. δ(15) N values were further influenced by light versus dark conditions and the probable occurrence of alternative biosynthetic pathways. We conclude that both biochemical pathways (that fractionate between isotopes) and nitrogen sources (used for amino acid production) should be considered when interpreting the δ(15) N value of leaf nitrogenous compounds.
Collapse
Affiliation(s)
- Paul P G Gauthier
- Institut de Biologie des Plantes, CNRS UMR 8618 Plateforme Métabolisme Métabolome, Université Paris Sud, Orsay Cedex, France.
| | | | | | | | | | | | | |
Collapse
|
39
|
Puttaswamy RK, Valap S, Pierson R, Das B, Hodges M, Hodgson R, Chaudhari S, Botros S, Moore P. The effect of ondansetron and intrathecal diamorphine on length of stay after caesarean section: an impact audit cycle. Anaesthesia 2012; 68:106. [PMID: 23231610 DOI: 10.1111/anae.12113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
40
|
Alton EW, Boushey HA, Garn H, Green FH, Hodges M, Martin RJ, Murdoch RD, Renz H, Shrewsbury SB, Seguin R, Johnson G, Parry JD, Tepper J, Renzi P, Cavagnaro J, Ferrari N. Clinical expert panel on monitoring potential lung toxicity of inhaled oligonucleotides: consensus points and recommendations. Nucleic Acid Ther 2012; 22:246-54. [PMID: 22809313 DOI: 10.1089/nat.2012.0345] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Oligonucleotides (ONs) are an emerging class of drugs being developed for the treatment of a wide variety of diseases including the treatment of respiratory diseases by the inhalation route. As a class, their toxicity on human lungs has not been fully characterized, and predictive toxicity biomarkers have not been identified. To that end, identification of sensitive methods and biomarkers that can detect toxicity in humans before any long term and/or irreversible side effects occur would be helpful. In light of the public's greater interests, the Inhalation Subcommittee of the Oligonucleotide Safety Working Group (OSWG) held expert panel discussions focusing on the potential toxicity of inhaled ONs and assessing the strengths and weaknesses of different monitoring techniques for use during the clinical evaluation of inhaled ON candidates. This white paper summarizes the key discussions and captures the panelists' perspectives and recommendations which, we propose, could be used as a framework to guide both industry and regulatory scientists in future clinical research to characterize and monitor the short and long term lung response to inhaled ONs.
Collapse
|
41
|
Tcherkez G, Boex-Fontvieille E, Mahé A, Hodges M. Respiratory carbon fluxes in leaves. Curr Opin Plant Biol 2012; 15:308-14. [PMID: 22244081 DOI: 10.1016/j.pbi.2011.12.003] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Revised: 12/12/2011] [Accepted: 12/13/2011] [Indexed: 05/04/2023]
Abstract
Leaf respiration is a major metabolic process that drives energy production and growth. Earlier works in this field were focused on the measurement of respiration rates in relation to carbohydrate content, photosynthesis, enzymatic activities or nitrogen content. Recently, several studies have shed light on the mechanisms describing the regulation of respiration in the light and in the dark and on associated metabolic flux patterns. This review will highlight advances made into characterizing respiratory fluxes and provide a discussion of metabolic respiration dynamics in relation to important biological functions.
Collapse
Affiliation(s)
- Guillaume Tcherkez
- Institut de Biologie des Plantes, CNRS UMR 8618, Université Paris-Sud, Orsay Cedex, France.
| | | | | | | |
Collapse
|
42
|
Tcherkez G, Mahé A, Hodges M. (12)C/(13)C fractionations in plant primary metabolism. Trends Plant Sci 2011; 16:499-506. [PMID: 21705262 DOI: 10.1016/j.tplants.2011.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Revised: 05/18/2011] [Accepted: 05/25/2011] [Indexed: 05/13/2023]
Abstract
Natural (13)C abundance is now an unavoidable tool to study ecosystem and plant carbon economies. A growing number of studies take advantage of isotopic fractionation between carbon pools or (13)C abundance in respiratory CO(2) to examine the carbon source of respiration, plant biomass production or organic matter sequestration in soils. (12)C/(13)C isotope effects associated with plant metabolism are thus essential to understand natural isotopic signals. However, isotope effects of enzymes do not influence metabolites separately, but combine to yield a (12)C/(13)C isotopologue redistribution orchestrated by metabolic flux patterns. In this review, we summarise key metabolic isotope effects and integrate them into the corpus of plant primary carbon metabolism.
Collapse
Affiliation(s)
- Guillaume Tcherkez
- Institut de Biologie des Plantes, CNRS UMR 8618, Université Paris-Sud 11, 91405 Orsay cedex, France
| | | | | |
Collapse
|
43
|
Foyer CH, Noctor G, Hodges M. Respiration and nitrogen assimilation: targeting mitochondria-associated metabolism as a means to enhance nitrogen use efficiency. J Exp Bot 2011; 62:1467-82. [PMID: 21282329 DOI: 10.1093/jxb/erq453] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Considerable advances in our understanding of the control of mitochondrial metabolism and its interactions with nitrogen metabolism and associated carbon/nitrogen interactions have occurred in recent years, particularly highlighting important roles in cellular redox homeostasis. The tricarboxylic acid (TCA) cycle is a central metabolic hub for the interacting pathways of respiration, nitrogen assimilation, and photorespiration, with components that show considerable flexibility in relation to adaptations to the different functions of mitochondria in photosynthetic and non-photosynthetic cells. By comparison, the operation of the oxidative pentose phosphate pathway appears to represent a significant limitation to nitrogen assimilation in non-photosynthetic tissues. Valuable new insights have been gained concerning the roles of the different enzymes involved in the production of 2-oxoglutarate (2-OG) for ammonia assimilation, yielding an improved understanding of the crucial role of cellular energy balance as a broker of co-ordinate regulation. Taken together with new information on the mechanisms that co-ordinate the expression of genes involved in organellar functions, including energy metabolism, and the potential for exploiting the existing flexibility for NAD(P)H utilization in the respiratory electron transport chain to drive nitrogen assimilation, the evidence that mitochondrial metabolism and machinery are potential novel targets for the enhancement of nitrogen use efficiency (NUE) is explored.
Collapse
Affiliation(s)
- Christine H Foyer
- Centre for Plant Sciences, Faculty of Biology, University of Leeds, Leeds LS2 9JT, UK
| | | | | |
Collapse
|
44
|
Vincent HK, Omli MR, Day T, Hodges M, Vincent KR, George SZ. Fear of Movement, Quality of Life, and Self-Reported Disability in Obese Patients with Chronic Lumbar Pain. Pain Med 2011; 12:154-64. [DOI: 10.1111/j.1526-4637.2010.01011.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
45
|
Baud S, Feria Bourrellier AB, Azzopardi M, Berger A, Dechorgnat J, Daniel-Vedele F, Lepiniec L, Miquel M, Rochat C, Hodges M, Ferrario-Méry S. PII is induced by WRINKLED1 and fine-tunes fatty acid composition in seeds of Arabidopsis thaliana. Plant J 2010. [PMID: 21070409 DOI: 10.1111/j.1365-313x.2010.04332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The PII protein is an integrator of central metabolism and energy levels. In Arabidopsis, allosteric sensing of cellular energy and carbon levels alters the ability of PII to interact with target enzymes such as N-acetyl-l-glutamate kinase and heteromeric acetyl-coenzyme A carboxylase, thereby modulating the biological activity of these plastidial ATP- and carbon-consuming enzymes. A quantitative reverse transcriptase-polymerase chain reaction approach revealed a threefold induction of the AtGLB1 gene (At4g01900) encoding PII during early seed maturation. The activity of the AtGLB1 promoter was consistent with this pattern. A complementary set of molecular and genetic analyses showed that WRINKLED1, a transcription factor known to induce glycolytic and fatty acid biosynthetic genes at the onset of seed maturation, directly controls AtGLB1 expression. Immunoblot analyses and immunolocalization experiments using anti-PII antibodies established that PII protein levels faithfully reflected AtGLB1 mRNA accumulation. At the subcellular level, PII was observed in plastids of maturing embryos. To further investigate the function of PII in seeds, comprehensive functional analyses of two pII mutant alleles were carried out. A transient increase in fatty acid production was observed in mutant seeds at a time when PII protein content was found to be maximal in wild-type seeds. Moreover, minor though statistically significant modifications of the fatty acid composition were measured in pII seeds, which exhibited decreased amounts of modified (elongated, desaturated) fatty acid species. The results obtained outline a role for PII in the fine tuning of fatty acid biosynthesis and partitioning in seeds.
Collapse
Affiliation(s)
- Sébastien Baud
- Institut Jean-Pierre Bourgin, Unité Mixte de Recherche 1318 INRA-AgroParisTech, INRA Centre de Versailles-Grignon, Route de Saint-Cyr (RD10), Versailles Cedex, France.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Baud S, Feria Bourrellier AB, Azzopardi M, Berger A, Dechorgnat J, Daniel-Vedele F, Lepiniec L, Miquel M, Rochat C, Hodges M, Ferrario-Méry S. PII is induced by WRINKLED1 and fine-tunes fatty acid composition in seeds of Arabidopsis thaliana. Plant J 2010; 64:291-303. [PMID: 21070409 DOI: 10.1111/j.1365-313x.2010.04332.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The PII protein is an integrator of central metabolism and energy levels. In Arabidopsis, allosteric sensing of cellular energy and carbon levels alters the ability of PII to interact with target enzymes such as N-acetyl-l-glutamate kinase and heteromeric acetyl-coenzyme A carboxylase, thereby modulating the biological activity of these plastidial ATP- and carbon-consuming enzymes. A quantitative reverse transcriptase-polymerase chain reaction approach revealed a threefold induction of the AtGLB1 gene (At4g01900) encoding PII during early seed maturation. The activity of the AtGLB1 promoter was consistent with this pattern. A complementary set of molecular and genetic analyses showed that WRINKLED1, a transcription factor known to induce glycolytic and fatty acid biosynthetic genes at the onset of seed maturation, directly controls AtGLB1 expression. Immunoblot analyses and immunolocalization experiments using anti-PII antibodies established that PII protein levels faithfully reflected AtGLB1 mRNA accumulation. At the subcellular level, PII was observed in plastids of maturing embryos. To further investigate the function of PII in seeds, comprehensive functional analyses of two pII mutant alleles were carried out. A transient increase in fatty acid production was observed in mutant seeds at a time when PII protein content was found to be maximal in wild-type seeds. Moreover, minor though statistically significant modifications of the fatty acid composition were measured in pII seeds, which exhibited decreased amounts of modified (elongated, desaturated) fatty acid species. The results obtained outline a role for PII in the fine tuning of fatty acid biosynthesis and partitioning in seeds.
Collapse
Affiliation(s)
- Sébastien Baud
- Institut Jean-Pierre Bourgin, Unité Mixte de Recherche 1318 INRA-AgroParisTech, INRA Centre de Versailles-Grignon, Route de Saint-Cyr (RD10), Versailles Cedex, France.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Hadley NH, Hodges M, Wilber DH, Coen LD. Evaluating Intertidal Oyster Reef Development in South Carolina Using Associated Faunal Indicators. Restor Ecol 2010. [DOI: 10.1111/j.1526-100x.2008.00502.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
48
|
Mhamdi A, Mauve C, Gouia H, Saindrenan P, Hodges M, Noctor G. Cytosolic NADP-dependent isocitrate dehydrogenase contributes to redox homeostasis and the regulation of pathogen responses in Arabidopsis leaves. Plant Cell Environ 2010; 33:1112-23. [PMID: 20199623 DOI: 10.1111/j.1365-3040.2010.02133.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Cytosolic NADP-dependent isocitrate dehydrogenase (cICDH) produces 2-oxoglutarate (2-OG) and NADPH, and is encoded by a single gene in Arabidopsis thaliana. Three allelic lines carrying T-DNA insertions in this gene showed less than 10% extractable leaf ICDH activity, but only relatively small decreases in growth compared to wild-type Col0. Metabolite profiling by gas chromatography-time of flight-mass spectrometry (GC-TOF-MS) and high-performance liquid chromatography (HPLC) revealed that loss of cICDH function produced only small effects on leaf compounds involved in carbon and nitrogen assimilation. To analyse whether cICDH contributes to NADPH production under conditions of oxidative stress, the icdh mutation was introduced into the cat2 background, in which increased availability of H(2)O(2) causes perturbed redox homeostasis and induction of stress-related genes. Accumulation of oxidized glutathione and pathogen-related responses were enhanced in double cat2 icdh mutants compared to cat2. Single icdh mutants presented constitutive induction of PR genes, and enhanced resistance to bacteria in icdh, cat2 and cat2 icdh was quantitatively correlated with PR gene expression. However, the effect of icdh in both Col0 and cat2 backgrounds was not associated with enhanced accumulation of salicylic acid (SA). The results suggest that cICDH, previously considered mainly as an enzyme involved in amino acid synthesis, plays a role in redox signalling linked to pathogen responses.
Collapse
Affiliation(s)
- Amna Mhamdi
- Institut de Biologie des Plantes, Université de Paris-Sud 11, 91405 Orsay Cedex, France
| | | | | | | | | | | |
Collapse
|
49
|
Gauthier PPG, Bligny R, Gout E, Mahé A, Nogués S, Hodges M, Tcherkez GGB. In folio isotopic tracing demonstrates that nitrogen assimilation into glutamate is mostly independent from current CO2 assimilation in illuminated leaves of Brassica napus. New Phytol 2010; 185:988-99. [PMID: 20070539 DOI: 10.1111/j.1469-8137.2009.03130.x] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
*Nitrogen assimilation in leaves requires primary NH(2) acceptors that, in turn, originate from primary carbon metabolism. Respiratory metabolism is believed to provide such acceptors (such as 2-oxoglutarate), so that day respiration is commonly seen as a cornerstone for nitrogen assimilation into glutamate in illuminated leaves. However, both glycolysis and day respiratory CO(2) evolution are known to be inhibited by light, thereby compromising the input of recent photosynthetic carbon for glutamate production. *In this study, we carried out isotopic labelling experiments with (13)CO(2) and (15)N-ammonium nitrate on detached leaves of rapeseed (Brassica napus), and performed (13)C- and (15)N-nuclear magnetic resonance analyses. *Our results indicated that the production of (13)C-glutamate and (13)C-glutamine under a (13)CO(2) atmosphere was very weak, whereas (13)C-glutamate and (13)C-glutamine appeared in both the subsequent dark period and the next light period under a (12)CO(2) atmosphere. Consistently, the analysis of heteronuclear ((13)C-(15)N) interactions within molecules indicated that most (15)N-glutamate and (15)N-glutamine molecules were not (13)C labelled after (13)C/(15)N double labelling. That is, recent carbon atoms (i.e. (13)C) were hardly incorporated into glutamate, but new glutamate molecules were synthesized, as evidenced by (15)N incorporation. *We conclude that the remobilization of night-stored molecules plays a significant role in providing 2-oxoglutarate for glutamate synthesis in illuminated rapeseed leaves, and therefore the natural day : night cycle seems critical for nitrogen assimilation.
Collapse
Affiliation(s)
- Paul P G Gauthier
- Institut de Biotechnologie des Plantes, Bâtiment 630, Université Paris-Sud XI, Orsay, France.
| | | | | | | | | | | | | |
Collapse
|
50
|
Crozet P, Jammes F, Valot B, Ambard-Bretteville F, Nessler S, Hodges M, Vidal J, Thomas M. Cross-phosphorylation between Arabidopsis thaliana sucrose nonfermenting 1-related protein kinase 1 (AtSnRK1) and its activating kinase (AtSnAK) determines their catalytic activities. J Biol Chem 2010; 285:12071-7. [PMID: 20164192 DOI: 10.1074/jbc.m109.079194] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Arabidopsis thaliana sucrose nonfermenting 1-related protein kinase 1 complexes belong to the SNF1/AMPK/SnRK1 protein kinase family that shares an ancestral function as central regulators of metabolism. In A. thaliana, the products of AtSnAK1 and AtSnAK2, orthologous to yeast genes, have been shown to autophosphorylate and to phosphorylate/activate the AtSnRK1.1 catalytic subunit on Thr(175). The phosphorylation of these kinases has been investigated by site-directed mutagenesis and tandem mass spectrometry. The autophosphorylation site of AtSnAK2 was identified as Thr(154), and it was shown to be required for AtSnAK catalytic activity. Interestingly, activated AtSnRK1 exerted a negative feedback phosphorylation on AtSnAK2 at Ser(261) (Ser(260) of AtSnAK1) that was dependent on AtSnAK autophosphorylation. The dynamics of these reciprocal phosphorylation events on the different kinases was established, and structural modeling allowed clarification of the topography of the AtSnAK phosphorylation sites. A mechanism is proposed to explain the observed changes in the enzymatic properties of each kinase triggered by these phosphorylation events.
Collapse
Affiliation(s)
- Pierre Crozet
- From the Laboratoire de Signalisation et Régulation Métabolique, Institut de Biologie des Plantes, Université Paris-Sud 11, UMR 8618 CNRS, Bâtiment 630, 91405 Orsay Cedex, France
| | | | | | | | | | | | | | | |
Collapse
|