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Smoleń S, Czernicka M, Kęska-Izworska K, Kowalska I, Grzebelus D, Pitala J, Halka M, Skoczylas Ł, Tabaszewska M, Liszka-Skoczylas M, Grzanka M, Ledwożyw-Smoleń I, Koronowicz A, Krzemińska J, Sularz O, Kiełbasa D, Neupauer J, Kováčik P. Transcriptomic and metabolic studies on the role of inorganic and organic iodine compounds in lettuce plants. Sci Rep 2023; 13:8440. [PMID: 37231053 PMCID: PMC10213046 DOI: 10.1038/s41598-023-34873-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 05/09/2023] [Indexed: 05/27/2023] Open
Abstract
Iodine (I) is considered a beneficial element or even micronutrient for plants. The aim of this study was to determine the molecular and physiological processes of uptake, transport, and metabolism of I applied to lettuce plants. KIO3, KIO3 + salicylic acid, 5-iodosalicylic acid and 3,5-diiodosalicylic acid were applied. RNA-sequencing was executed using 18 cDNA libraries constructed separately for leaves and roots from KIO3, SA and control plants. De novo transcriptome assembly generated 1937.76 million sequence reads resulting in 27,163 transcripts with N50 of 1638 bp. 329 differentially expressed genes (DEGs) in roots were detected after application of KIO3, out of which 252 genes were up-regulated, and 77 were down-regulated. In leaves, 9 genes revealed differential expression pattern. DEGs analysis indicated its involvement in such metabolic pathways and processes as: chloride transmembrane transport, phenylpropanoid metabolism, positive regulation of defense response and leaf abscission, and also ubiquinone and other terpenoid-quinone biosynthesis, protein processing in endoplasmic reticulum, circadian rhythm including flowering induction as well as a putative PDTHA (i.e. Plant Derived Thyroid Hormone Analogs) metabolic pathway. qRT-PCR of selected genes suggested their participation in the transport and metabolism of iodine compounds, biosynthesis of primary and secondary metabolites, PDTHA pathway and flowering induction.
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Affiliation(s)
- Sylwester Smoleń
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Małgorzata Czernicka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland.
| | - Kinga Kęska-Izworska
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Iwona Kowalska
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Dariusz Grzebelus
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Joanna Pitala
- Laboratory of Mass Spectrometry, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Mariya Halka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Łukasz Skoczylas
- Department of Plant Product Technology and Nutrition Hygiene, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Małgorzata Tabaszewska
- Department of Plant Product Technology and Nutrition Hygiene, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Marta Liszka-Skoczylas
- Department of Engineering and Machinery for Food Industry, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Marlena Grzanka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Iwona Ledwożyw-Smoleń
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Aneta Koronowicz
- Department of Human Nutrition and Dietetics, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Joanna Krzemińska
- Department of Human Nutrition and Dietetics, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Olga Sularz
- Department of Human Nutrition and Dietetics, Faculty of Food Technology, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Daniel Kiełbasa
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120, Krakow, Poland
| | - Jakub Neupauer
- Department of Agrochemistry and Plant Nutrition, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 01, Nitra, Slovakia
| | - Peter Kováčik
- Department of Agrochemistry and Plant Nutrition, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 01, Nitra, Slovakia
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Zhan C, Zhu P, Chen Y, Chen X, Liu K, Chen S, Hu J, He Y, Xie T, Luo S, Yang Z, Chen S, Tang H, Zhang H, Cheng J. Identification of a key locus, qNL3.1, associated with seed germination under salt stress via a genome-wide association study in rice. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:58. [PMID: 36912929 PMCID: PMC10011300 DOI: 10.1007/s00122-023-04252-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 12/07/2022] [Indexed: 06/18/2023]
Abstract
Two causal OsTTL and OsSAPK1 genes of the key locus qNL3.1 significantly associated with seed germination under salt stress were identified via a genome-wide association study, which could improve rice seed germination under salt stress. Rice is a salt-sensitive crop, and its seed germination determines subsequent seedling establishment and yields. In this study, 168 accessions were investigated for the genetic control of seed germination under salt stress based on the germination rate (GR), germination index (GI), time at which 50% germination was achieved (T50) and mean level (ML). Extensive natural variation in seed germination was observed among accessions under salt stress. Correlation analysis showed significantly positive correlations among GR, GI and ML and a negative correlation with T50 during seed germination under salt stress. Forty-nine loci significantly associated with seed germination under salt stress were identified, and seven of these were identified in both years. By comparison, 16 loci were colocated with the previous QTLs, and the remaining 33 loci might be novel. qNL3.1, colocated with qLTG-3, was simultaneously identified with the four indices in two years and might be a key locus for seed germination under salt stress. Analysis of candidate genes showed that two genes, the similar to transthyretin-like protein OsTTL and the serine/threonine protein kinase OsSAPK1, were the causal genes of qNL3.1. Germination tests indicated that both Osttl and Ossapk1 mutants significantly reduced seed germination under salt stress compared to the wild type. Haplotype analysis showed that Hap.1 of OsTTL and Hap.1 of OsSAPK1 genes were excellent alleles, and their combination resulted in high seed germination under salt stress. Eight accessions with elite performance of seed germination under salt stress were identified, which could improve rice seed germination under salt stress.
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Affiliation(s)
- Chengfang Zhan
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
- State Key Laboratory of Rice Biology & Ministry of Agricultural and Rural Affairs Laboratory of Molecular Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou, 310058, China
| | - Peiwen Zhu
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Yongji Chen
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Xinyi Chen
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Kexin Liu
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Shanshan Chen
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Jiaxiao Hu
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Ying He
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Ting Xie
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Shasha Luo
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Zeyuan Yang
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Sunlu Chen
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Haijuan Tang
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Hongsheng Zhang
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China.
| | - Jinping Cheng
- National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Jiangsu Collaborative Innovation Center for Modern Crop Production, Hainan Yazhou Bay Seed Lab, Jiangsu Province Engineering Research Center of Seed Industry Science and Technology, Nanjing Agricultural University, Nanjing, China.
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Enzymes and cellular interplay required for flux of fixed nitrogen to ureides in bean nodules. Nat Commun 2022; 13:5331. [PMID: 36088455 PMCID: PMC9464200 DOI: 10.1038/s41467-022-33005-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 08/29/2022] [Indexed: 11/27/2022] Open
Abstract
Tropical legumes transport fixed nitrogen in form of ureides (allantoin and allantoate) over long distances from the nodules to the shoot. Ureides are formed in nodules from purine mononucleotides by a partially unknown reaction network that involves bacteroid-infected and uninfected cells. Here, we demonstrate by metabolic analysis of CRISPR mutant nodules of Phaseolus vulgaris defective in either xanthosine monophosphate phosphatase (XMPP), guanosine deaminase (GSDA), the nucleoside hydrolases 1 and 2 (NSH1, NSH2) or xanthine dehydrogenase (XDH) that nodule ureide biosynthesis involves these enzymes and requires xanthosine and guanosine but not inosine monophosphate catabolism. Interestingly, promoter reporter analyses revealed that XMPP, GSDA and XDH are expressed in infected cells, whereas NSH1, NSH2 and the promoters of the downstream enzymes urate oxidase (UOX) and allantoinase (ALN) are active in uninfected cells. The data suggest a complex cellular organization of ureide biosynthesis with three transitions between infected and uninfected cells. Tropical legumes export fixed nitrogen from nodules as ureides. Here, the authors describe how ureides are produced by several biosynthetic enzymes in different nodule cell types and provide explanations for metabolic compartmentation.
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Rahman MM, Ahmed J, Asiri AM, Alfaifi SY, Marwani HM. Development of Methanol Sensor Based on Sol-Gel Drop-Coating Co 3O 4·CdO·ZnO Nanoparticles Modified Gold-Coated µ-Chip by Electro-Oxidation Process. Gels 2021; 7:gels7040235. [PMID: 34940295 PMCID: PMC8701126 DOI: 10.3390/gels7040235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/17/2021] [Accepted: 11/23/2021] [Indexed: 12/20/2022] Open
Abstract
Herein, novel Co3O4·CdO·ZnO-based tri-metallic oxide nanoparticles (CCZ) were synthesized by a simple solution method in basic phase. We have used Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field Emission Scanning Electron Microscope (FESEM), Dynamic Light Scattering (DLS), Tunneling Electron Microscopy (TEM), and Energy-Dispersive Spectroscopy (EDS) techniques to characterize the CCZ nanoparticles. XRD, TEM, DLS, and FESEM investigations have confirmed the tri-metallic nanoparticles’ structure, while XPS and EDS analyses have shown the elemental compositions of the CCZ nanoparticles. Later, a Au/μ-Chip was modified with the CCZ nanoparticles using a conducting binder, PEDOT: PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) in a sol-gel system, and dried completely in air. Then, the CCZ/Au/μ-Chip sensor was used to detect methanol (MeOH) in phosphate buffer solution (PBS). Outstanding sensing performance was achieved for the CCZ/Au/μ-Chip sensor, such as excellent sensitivity (1.3842 µAµM−1cm−2), a wide linear dynamic range of 1.0 nM–2.0 mM (R2 = 0.9992), an ultra-low detection limit (32.8 ± 0.1 pM at S/N = 3), a fast response time (~11 s), and excellent reproducibility and repeatability. This CCZ/Au/μ-Chip sensor was further applied with appropriate quantification results in real environmental sample analyses.
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Affiliation(s)
- Mohammed M. Rahman
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.M.A.); (S.Y.M.A.); (H.M.M.)
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
- Correspondence: or ; Tel.: +966-59-642-1830; Fax: +966-12-695-2292
| | - Jahir Ahmed
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia;
| | - Abdullah M. Asiri
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.M.A.); (S.Y.M.A.); (H.M.M.)
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Sulaiman Y.M. Alfaifi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.M.A.); (S.Y.M.A.); (H.M.M.)
| | - Hadi. M. Marwani
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (A.M.A.); (S.Y.M.A.); (H.M.M.)
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
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Rakoczy-Lelek R, Smoleń S, Grzanka M, Ambroziak K, Pitala J, Skoczylas Ł, Liszka-Skoczylas M, Kardasz H. Effectiveness of Foliar Biofortification of Carrot With Iodine and Selenium in a Field Condition. FRONTIERS IN PLANT SCIENCE 2021; 12:656283. [PMID: 34093613 PMCID: PMC8177008 DOI: 10.3389/fpls.2021.656283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 03/23/2021] [Indexed: 05/26/2023]
Abstract
Iodine (I) and selenium (Se) are essential to human and animal development. There is a worldwide deficit of I and Se in the diet of humans, as well as in animals. It is advisable to enrich plants with these elements to ensure adequate uptake in animals and humans. The aim of this study was to determine the efficacy of the application of I and Se in the cultivation of carrot crops, to better understand the metabolic pathways and processes of I applied through foliar spray. Carrots were fertilized with 4-fold foliar applications of I and Se, which were applied as the liquid fertilizers "I + Se", "Solo iodine" and "Solo selenium", all containing an organic stabilizer, in two field trials. Foliar nutrient applications of I and Se were translocated by the plant for storage in the roots. The level of enriched I and Se in the roots was considered safe for the consumer. The Recommended Daily Allowance values for I and Se in the roots of 100 g of fresh carrots are 4.16% and 4.37%, respectively. Furthermore, I and Se accumulated in the roots to a level that was physiologically tolerated by carrot. Biofortification through foliar feeding did not impact negatively on the yield or quality of the carrot crop. Iodides applied via foliar application were the dominant form of I in the plant tissues and were included in the metabolic process of the synthesis of iodosalicylates, iodobenzoates, iodotyrosine (I-Tyr), and plant-derived thyroid hormone analogs. No synergistic or antagonistic interaction between I and Se, with respect to the effectiveness of biofortification in roots, was observed in any treatments. The molar ratio of I:Se in the roots after foliar application of both elements was approximately 1.6:1 and was similar to the control (1.35:1).
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Affiliation(s)
| | - Sylwester Smoleń
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Kraków, Kraków, Poland
- Laboratory of Mass Spectrometry, Faculty of Biotechnology and Horticulture, University of Agriculture in Kraków, Kraków, Poland
| | - Marlena Grzanka
- Intermag Sp. z o.o., Olkusz, Poland
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Kraków, Kraków, Poland
| | | | - Joanna Pitala
- Laboratory of Mass Spectrometry, Faculty of Biotechnology and Horticulture, University of Agriculture in Kraków, Kraków, Poland
| | - Łukasz Skoczylas
- Department of Plant Product Technology and Nutrition Hygiene, Faculty of Food Technology, University of Agriculture in Kraków, Kraków, Poland
| | - Marta Liszka-Skoczylas
- Department of Engineering and Machinery for Food Industry, Faculty of Food Technology, University of Agriculture in Kraków, Kraków, Poland
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Smoleń S, Czernicka M, Kowalska I, Kȩska K, Halka M, Grzebelus D, Grzanka M, Skoczylas Ł, Pitala J, Koronowicz A, Kováčik P. New Aspects of Uptake and Metabolism of Non-organic and Organic Iodine Compounds-The Role of Vanadium and Plant-Derived Thyroid Hormone Analogs in Lettuce. FRONTIERS IN PLANT SCIENCE 2021; 12:653168. [PMID: 33936138 PMCID: PMC8086602 DOI: 10.3389/fpls.2021.653168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/19/2021] [Indexed: 05/26/2023]
Abstract
The process of uptake and translocation of non-organic iodine (I) ions, I- and IO3 -, has been relatively well-described in literature. The situation is different for low-molecular-weight organic aromatic I compounds, as data on their uptake or metabolic pathway is only fragmentary. The aim of this study was to determine the process of uptake, transport, and metabolism of I applied to lettuce plants by fertigation as KIO3, KIO3 + salicylic acid (KIO3+SA), and iodosalicylates, 5-iodosalicylic acid (5-ISA) and 3,5-diiodosalicylic acid (3,5-diISA), depending on whether additional fertilization with vanadium (V) was used. Each I compound was applied at a dose of 10 μM, SA at a dose of 10 μM, and V at a dose of 0.1 μM. Three independent 2-year-long experiments were carried out with lettuce; two with pot systems using a peat substrate and mineral soil and one with hydroponic lettuce. The effectiveness of I uptake and translocation from the roots to leaves was as follows: 5-ISA > 3,5-diISA > KIO3. Iodosalicylates, 5-ISA and 3,5-diISA, were naturally synthesized in plants, similarly to other organic iodine metabolites, i.e., iodotyrosine, as well as plant-derived thyroid hormone analogs (PDTHA), triiodothyronine (T3) and thyroxine (T4). T3 and T4 were synthesized in roots with the participation of endogenous and exogenous 5-ISA and 3,5-diISA and then transported to leaves. The level of plant enrichment in I was safe for consumers. Several genes were shown to perform physiological functions, i.e., per64-like, samdmt, msams5, and cipk6.
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Affiliation(s)
- Sylwester Smoleń
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Małgorzata Czernicka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Iwona Kowalska
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Kinga Kȩska
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Maria Halka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Dariusz Grzebelus
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Marlena Grzanka
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Łukasz Skoczylas
- Department of Plant Product Technology and Nutrition Hygiene, Faculty of Food Technology, University of Agriculture in Krakow, Kraków, Poland
| | - Joanna Pitala
- Laboratory of Mass Spectrometry, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Kraków, Poland
| | - Aneta Koronowicz
- Department of Human Nutrition and Dietetics, Faculty of Food Technology, University of Agriculture in Krakow, Kraków, Poland
| | - Peter Kováčik
- Department of Agrochemistry and Plant Nutrition, Slovak University of Agriculture in Nitra, Nitra, Slovakia
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Kechasov D, de Grahl I, Endries P, Reumann S. Evolutionary Maintenance of the PTS2 Protein Import Pathway in the Stramenopile Alga Nannochloropsis. Front Cell Dev Biol 2020; 8:593922. [PMID: 33330478 PMCID: PMC7710942 DOI: 10.3389/fcell.2020.593922] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/13/2020] [Indexed: 12/18/2022] Open
Abstract
The stramenopile alga Nannochloropsis evolved by secondary endosymbiosis of a red alga by a heterotrophic host cell and emerged as a promising organism for biotechnological applications, such as the production of polyunsaturated fatty acids and biodiesel. Peroxisomes play major roles in fatty acid metabolism but experimental analyses of peroxisome biogenesis and metabolism in Nannochloropsis are not reported yet. In fungi, animals, and land plants, soluble proteins of peroxisomes are targeted to the matrix by one of two peroxisome targeting signals (type 1, PTS1, or type 2, PTS2), which are generally conserved across kingdoms and allow the prediction of peroxisomal matrix proteins from nuclear genome sequences. Because diatoms lost the PTS2 pathway secondarily, we investigated its presence in the stramenopile sister group of diatoms, the Eustigmatophyceae, represented by Nannochloropsis. We detected a full-length gene of a putative PEX7 ortholog coding for the cytosolic receptor of PTS2 proteins and demonstrated its expression in Nannochloropsis gaditana. The search for predicted PTS2 cargo proteins in N. gaditana yielded several candidates. In vivo subcellular targeting analyses of representative fusion proteins in different plant expression systems demonstrated that two predicted PTS2 domains were indeed functional and sufficient to direct a reporter protein to peroxisomes. Peroxisome targeting of the predicted PTS2 cargo proteins was further confirmed in Nannochloropsis oceanica by confocal and transmission electron microscopy. Taken together, the results demonstrate for the first time that one group of stramenopile algae maintained the import pathway for PTS2 cargo proteins. To comprehensively map and model the metabolic capabilities of Nannochloropsis peroxisomes, in silico predictions needs to encompass both the PTS1 and the PTS2 matrix proteome.
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Affiliation(s)
- Dmitry Kechasov
- Centre for Organelle Research, University of Stavanger, Stavanger, Norway
| | - Imke de Grahl
- Plant Biochemistry and Infection Biology, Institute for Plant Science and Microbiology, Universität Hamburg, Hamburg, Germany
| | - Pierre Endries
- Plant Biochemistry and Infection Biology, Institute for Plant Science and Microbiology, Universität Hamburg, Hamburg, Germany
| | - Sigrun Reumann
- Centre for Organelle Research, University of Stavanger, Stavanger, Norway
- Plant Biochemistry and Infection Biology, Institute for Plant Science and Microbiology, Universität Hamburg, Hamburg, Germany
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Chen T, Zhang W, Yang G, Chen JH, Chen BX, Sun R, Zhang H, An LZ. TRANSTHYRETIN-LIKE and BYPASS1-LIKE co-regulate growth and cold tolerance in Arabidopsis. BMC PLANT BIOLOGY 2020; 20:332. [PMID: 32664862 PMCID: PMC7362626 DOI: 10.1186/s12870-020-02534-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 06/28/2020] [Indexed: 05/13/2023]
Abstract
BACKGROUND Cold stress inhibits normal physiological metabolism in plants, thereby seriously affecting plant development. Meanwhile, plants also actively adjust their metabolism and development to adapt to changing environments. Several cold tolerance regulators have been found to participate in the regulation of plant development. Previously, we reported that BYPASS1-LIKE (B1L), a DUF793 family protein, participates in the regulation of cold tolerance, at least partly through stabilizing C-REPEAT BINDING FACTORS (CBFs). In this study, we found that B1L interacts with TRANSTHYRETIN-LIKE (TTL) protein, which is involved in brassinosteroid (BR)-mediated plant growth and catalyses the synthesis of S-allantoin, and both proteins participate in modulating plant growth and cold tolerance. RESULTS The results obtained with yeast two hybrid (Y2H) and bimolecular fluorescence complementation (BiFC) assays showed that B1L directly interacted with TTL. Similar to the ttl-1 and ttl-2 mutants, the b1l mutant displayed a longer hypocotyl and greater fresh weight than wild type, whereas B1L-overexpressing lines exhibited a shorter hypocotyl and reduced fresh weight. Moreover, ttl-1 displayed freezing tolerance to cold treatment compared with WT, whereas the b1l mutant and TTL-overexpressing lines were freezing-sensitive. The b1l ttl double mutant had a developmental phenotype and freezing tolerance that were highly similar to those of ttl-1 compared to b1l, indicating that TTL is important for B1L function. Although low concentrations of brassinolide (0.1 or 1 nM) displayed similarly promoted hypocotyl elongation of WT and b1l under normal temperature, it showed less effect to the hypocotyl elongation of b1l than to that of WT under cold conditions. In addition, the b1l mutant also contained less amount of allantoin than Col-0. CONCLUSION Our results indicate that B1L and TTL co-regulate development and cold tolerance in Arabidopsis, and BR and allantoin may participate in these processes through B1L and TTL.
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Affiliation(s)
- Tao Chen
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Wei Zhang
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Gang Yang
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Jia-Hui Chen
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Bi-Xia Chen
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Rui Sun
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Hua Zhang
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China.
| | - Li-Zhe An
- The Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China.
- School of Forestry, Beijing Forestry University, Beijing, 100083, People's Republic of China.
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9
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Witte CP, Herde M. Nucleotide Metabolism in Plants. PLANT PHYSIOLOGY 2020; 182:63-78. [PMID: 31641078 PMCID: PMC6945853 DOI: 10.1104/pp.19.00955] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 10/15/2019] [Indexed: 05/14/2023]
Abstract
Nucleotide metabolism is an essential function in plants.
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Affiliation(s)
- Claus-Peter Witte
- Leibniz Universität Hannover, Department of Molecular Nutrition and Biochemistry of Plants, Herrenhäuser Strasse 2, 30419 Hannover, Germany
| | - Marco Herde
- Leibniz Universität Hannover, Department of Molecular Nutrition and Biochemistry of Plants, Herrenhäuser Strasse 2, 30419 Hannover, Germany
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10
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Baccolini C, Witte CP. AMP and GMP Catabolism in Arabidopsis Converge on Xanthosine, Which Is Degraded by a Nucleoside Hydrolase Heterocomplex. THE PLANT CELL 2019; 31:734-751. [PMID: 30787180 PMCID: PMC6482636 DOI: 10.1105/tpc.18.00899] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/28/2019] [Accepted: 02/14/2019] [Indexed: 05/17/2023]
Abstract
Plants can fully catabolize purine nucleotides. A firmly established central intermediate is the purine base xanthine. In the current widely accepted model of plant purine nucleotide catabolism, xanthine can be generated in various ways involving either inosine and hypoxanthine or guanosine and xanthosine as intermediates. In a comprehensive mutant analysis involving single and multiple mutants of urate oxidase, xanthine dehydrogenase, nucleoside hydrolases, guanosine deaminase, and hypoxanthine guanine phosphoribosyltransferase, we demonstrate that purine nucleotide catabolism in Arabidopsis (Arabidopsis thaliana) mainly generates xanthosine, but not inosine and hypoxanthine, and that xanthosine is derived from guanosine deamination and a second source, likely xanthosine monophosphate dephosphorylation. Nucleoside hydrolase 1 (NSH1) is known to be essential for xanthosine hydrolysis, but the in vivo function of a second cytosolic nucleoside hydrolase, NSH2, is unclear. We demonstrate that NSH1 activates NSH2 in vitro and in vivo, forming a complex with almost two orders of magnitude higher catalytic efficiency for xanthosine hydrolysis than observed for NSH1 alone. Remarkably, an inactive NSH1 point mutant can activate NSH2 in vivo, fully preventing purine nucleoside accumulation in nsh1 background. Our data lead to an altered model of purine nucleotide catabolism that includes an NSH heterocomplex as a central component.
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Affiliation(s)
- Chiara Baccolini
- Department of Molecular Nutrition and Biochemistry of Plants, Institute of Plant Nutrition, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
| | - Claus-Peter Witte
- Department of Molecular Nutrition and Biochemistry of Plants, Institute of Plant Nutrition, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
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11
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Casartelli A, Melino VJ, Baumann U, Riboni M, Suchecki R, Jayasinghe NS, Mendis H, Watanabe M, Erban A, Zuther E, Hoefgen R, Roessner U, Okamoto M, Heuer S. Opposite fates of the purine metabolite allantoin under water and nitrogen limitations in bread wheat. PLANT MOLECULAR BIOLOGY 2019; 99:477-497. [PMID: 30721380 DOI: 10.1007/s11103-019-00831-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 01/24/2019] [Indexed: 05/06/2023]
Abstract
Degradation of nitrogen-rich purines is tightly and oppositely regulated under drought and low nitrogen supply in bread wheat. Allantoin is a key target metabolite for improving nitrogen homeostasis under stress. The metabolite allantoin is an intermediate of the catabolism of purines (components of nucleotides) and is known for its housekeeping role in nitrogen (N) recycling and also for its function in N transport and storage in nodulated legumes. Allantoin was also shown to differentially accumulate upon abiotic stress in a range of plant species but little is known about its role in cereals. To address this, purine catabolic pathway genes were identified in hexaploid bread wheat and their chromosomal location was experimentally validated. A comparative study of two Australian bread wheat genotypes revealed a highly significant increase of allantoin (up to 29-fold) under drought. In contrast, allantoin significantly decreased (up to 22-fold) in response to N deficiency. The observed changes were accompanied by transcriptional adjustment of key purine catabolic genes, suggesting that the recycling of purine-derived N is tightly regulated under stress. We propose opposite fates of allantoin in plants under stress: the accumulation of allantoin under drought circumvents its degradation to ammonium (NH4+) thereby preventing N losses. On the other hand, under N deficiency, increasing the NH4+ liberated via allantoin catabolism contributes towards the maintenance of N homeostasis.
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Affiliation(s)
- Alberto Casartelli
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
- Strube Research GmbH & Co. KG, 38387, Söllingen, Germany
| | - Vanessa J Melino
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
- School of Agriculture and Food, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Ute Baumann
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
| | - Matteo Riboni
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
| | - Radoslaw Suchecki
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
| | - Nirupama S Jayasinghe
- Metabolomics Australia, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Himasha Mendis
- Metabolomics Australia, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Mutsumi Watanabe
- Max Plank Institute of Molecular Plant Physiology, 14476, Potsdam, Golm, Germany
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Alexander Erban
- Max Plank Institute of Molecular Plant Physiology, 14476, Potsdam, Golm, Germany
| | - Ellen Zuther
- Max Plank Institute of Molecular Plant Physiology, 14476, Potsdam, Golm, Germany
| | - Rainer Hoefgen
- Max Plank Institute of Molecular Plant Physiology, 14476, Potsdam, Golm, Germany
| | - Ute Roessner
- Metabolomics Australia, The University of Melbourne, Parkville, VIC, 3052, Australia
| | - Mamoru Okamoto
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia
| | - Sigrid Heuer
- School of Agriculture Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia.
- Rothamsted Research, Plant Science Department, Harpenden, Hertfordshire, AL5 2JQ, UK.
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12
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Nourimand M, Todd CD. There is a direct link between allantoin concentration and cadmium tolerance in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 135:441-449. [PMID: 30473421 DOI: 10.1016/j.plaphy.2018.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 11/09/2018] [Accepted: 11/14/2018] [Indexed: 05/17/2023]
Abstract
Allantoin, an important intermediate of ureide metabolism, has been the subject of investigation recently due to its dual function in nitrogen recycling and abiotic stress response in plants. Allantoin appears to be the dominant ureide accumulating in response to different abiotic stresses, and mutants containing elevated allantoin concentrations exhibit a stress-tolerant phenotype due to limited reactive oxygen species (ROS) generation. Here we describe the involvement of allantoin in stress response and attempt to explain the regulatory mechanism(s) underlying allantoin function in plants. Growth of wild type Col-0 seedlings in the presence of exogenous allantoin improved root elongation in response to Cd treatment. Allantoin treatment of Col-0 seeds increases superoxide dismutase activity causing an enhanced seed germination and seedling growth following Cd exposure. Additionally, allantoinase-overexpressed (ALNox) lines, with lower levels of allantoin, exhibited more susceptibility to Cd treatment than Col-0 Arabidopsis, implying that there is a positive correlation between allantoin concentration and Cd resistance in plants. Growing ABA-insensitive (abi) mutants on allantoin-containing media and comparison between abi mutants and their wild-type backgrounds demonstrated that the potential regulatory function of allantoin does not require ABA at germination but may be ABA-dependent at later stages of seedling growth, suggesting a potential crosstalk between allantoin-mediated stress response and ABA signalling pathway in plants.
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Affiliation(s)
- Maryam Nourimand
- Department of Biology, University of Saskatchewan, Saskatoon, S7N 5E2, Canada
| | - Christopher D Todd
- Department of Biology, University of Saskatchewan, Saskatoon, S7N 5E2, Canada.
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13
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Takagi H, Watanabe S, Tanaka S, Matsuura T, Mori IC, Hirayama T, Shimada H, Sakamoto A. Disruption of ureide degradation affects plant growth and development during and after transition from vegetative to reproductive stages. BMC PLANT BIOLOGY 2018; 18:287. [PMID: 30458716 PMCID: PMC6245725 DOI: 10.1186/s12870-018-1491-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 10/19/2018] [Indexed: 05/08/2023]
Abstract
BACKGROUND The ureides allantoin and allantoate are major metabolic intermediates of purine catabolism with high nitrogen-to-carbon ratios. Ureides play a key role in nitrogen utilization in ureide-type legumes, but their effects on growth and development in non-legume plants are poorly understood. Here, we examined the effects of knocking out genes encoding ureide-degrading enzymes, allantoinase (ALN) and allantoate amidohydrolase (AAH), on the vegetative-to-reproductive transition and subsequent growth of Arabidopsis plants. RESULTS The ureide-degradation mutants (aln and aah) showed symptoms similar to those of nitrogen deficiency: early flowering, reduced size at maturity, and decreased fertility. Consistent with these phenotypes, carbon-to-nitrogen ratios and nitrogen-use efficiencies were significantly decreased in ureide-degradation mutants; however, adding nitrogen to irrigation water did not alleviate the reduced growth of these mutants. In addition to nitrogen status, levels of indole-3-acetic acid and gibberellin in five-week-old plants were also affected by the aln mutations. To test the possibility that ureides are remobilized from source to sink organs, we measured ureide levels in various organs. In wild-type plants, allantoate accumulated predominantly in inflorescence stems and siliques; this accumulation was augmented by disruption of its catabolism. Mutants lacking ureide transporters, ureide permeases 1 and 2 (UPS1 and UPS2), exhibited phenotypes similar to those of the ureide-degradation mutants, but had decreased allantoate levels in the reproductive organs. Transcript analysis in wild-type plants suggested that genes involved in allantoate synthesis and ureide transport were coordinately upregulated in senescing leaves. CONCLUSIONS This study demonstrates that ureide degradation plays an important role in supporting healthy growth and development in non-legume Arabidopsis during and after transition from vegetative to reproductive stages.
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Affiliation(s)
- Hiroshi Takagi
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Japan
- Present Address: Microbial and Plant Genomics Institute, University of Minnesota, Saint Paul, MN 55108 USA
| | - Shunsuke Watanabe
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Japan
- Present Address: Center for Sustainable Resource Science, RIKEN, Yokohama, 230-0045 Japan
| | - Shoma Tanaka
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Japan
| | - Takakazu Matsuura
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046 Japan
| | - Izumi C. Mori
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046 Japan
| | - Takashi Hirayama
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046 Japan
| | - Hiroshi Shimada
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Japan
| | - Atsushi Sakamoto
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Japan
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14
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Oh J, Liuzzi A, Ronda L, Marchetti M, Corsini R, Folli C, Bettati S, Rhee S, Percudani R. Diatom Allantoin Synthase Provides Structural Insights into Natural Fusion Protein Therapeutics. ACS Chem Biol 2018; 13:2237-2246. [PMID: 29874034 DOI: 10.1021/acschembio.8b00404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Humans have lost the ability to convert urate into the more soluble allantoin with the evolutionary inactivation of three enzymes of the uricolytic pathway. Restoration of this function through enzyme replacement therapy can treat severe hyperuricemia and Lesch-Nyhan disease. Through a genomic exploration of natural gene fusions, we found that plants and diatoms independently evolved a fusion protein (allantoin synthase) complementing two human pseudogenes. The 1.85-Å-resolution crystal structure of allantoin synthase from the diatom Phaeodactylum tricornutum provides a rationale for the domain combinations observed in the metabolic pathway, suggesting that quaternary structure is key to the evolutionary success of protein domain fusions. Polyethylene glycol (PEG) conjugation experiments indicate that a PEG-modified form of the natural fusion protein provides advantages over separate enzymes in terms of activity maintenance and manufacturing of the bioconjugate. These results suggest that the combination of different activities in a single molecular unit can simplify the production and chemical modification of recombinant proteins for multifunctional enzyme therapy.
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Affiliation(s)
- Juntaek Oh
- Department of Agricultural Biotechnology, Seoul National University, Seoul, Republic of Korea
| | - Anastasia Liuzzi
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, 43124, Parma, Italy
| | - Luca Ronda
- Department of Medicine and Surgery, University of Parma, 43124, Parma, Italy
- Biopharmanet-TEC Interdepartmental Center, University of Parma, 43124, Parma, Italy
| | - Marialaura Marchetti
- Biopharmanet-TEC Interdepartmental Center, University of Parma, 43124, Parma, Italy
| | - Romina Corsini
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, 43124, Parma, Italy
| | - Claudia Folli
- Department of Food and Drug, University of Parma, 43124, Parma, Italy
| | - Stefano Bettati
- Department of Medicine and Surgery, University of Parma, 43124, Parma, Italy
- Biopharmanet-TEC Interdepartmental Center, University of Parma, 43124, Parma, Italy
- National Institute of Biostructures and Biosystems, 00136, Rome, Italy
| | - Sangkee Rhee
- Department of Agricultural Biotechnology, Seoul National University, Seoul, Republic of Korea
| | - Riccardo Percudani
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, 43124, Parma, Italy
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15
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Irani S, Todd CD. Ureide metabolism under abiotic stress in Arabidopsis thaliana. JOURNAL OF PLANT PHYSIOLOGY 2016; 199:87-95. [PMID: 27302009 DOI: 10.1016/j.jplph.2016.05.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/17/2016] [Accepted: 05/18/2016] [Indexed: 05/21/2023]
Abstract
Ureides are nitrogenous compounds derived from purine catabolism which contribute to nitrogen recycling in plants. Accumulation of ureide compounds has been reported in a number of plant species under stress conditions, suggesting their involvement in plants' response to stress. In this research a biochemical and molecular approach was applied to address the ureide accumulation under abiotic stress conditions in Arabidopsis thaliana. Ureide concentration and changes in expression of ureide metabolic genes were examined in response to drought, NaCl and mannitol treatments. Additionally, an Arabidopsis allantoinase (ALN) mutant with constitutive accumulation of a ureide compound, allantoin, was used to investigate the impact of high levels of this compound on drought and NaCl stress responses. In the leaf tissue of adult plants allantoin accumulated in response to soil drying. Transcription of urate oxidase (UO), involved in allantoin production, was highly up-regulated under the same conditions. Allantoin and allantoate also accumulated in seedlings following treatment with NaCl or mannitol. aln mutants with enhanced levels of allantoin exhibited higher tolerance to drought and NaCl. Hydrogen peroxide and superoxide did not accumulate in the aln mutant leaves to the same degree in response to drought when compared to the wild-type. Our results suggest that ureide metabolism and accumulation contribute to the abiotic stress response which is regulated, at least in part, at the transcriptional level. Higher concentrations of allantoin in the mutant elevates abiotic stress tolerance, possibly by reducing oxidative damage.
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Affiliation(s)
- Solmaz Irani
- Department of Biology, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada
| | - Christopher D Todd
- Department of Biology, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada.
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16
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Baral B, Teixeira da Silva JA, Izaguirre-Mayoral ML. Early signaling, synthesis, transport and metabolism of ureides. JOURNAL OF PLANT PHYSIOLOGY 2016; 193:97-109. [PMID: 26967003 DOI: 10.1016/j.jplph.2016.01.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 12/04/2015] [Accepted: 01/11/2016] [Indexed: 05/26/2023]
Abstract
The symbiosis between α nitrogen (N2)-fixing Proteobacteria (family Rhizobiaceae) and legumes belonging to the Fabaceae (a single phylogenetic group comprising three subfamilies: Caesalpinioideae, Mimosoideae and Papilionoideae) results in the formation of a novel root structure called a nodule, where atmospheric N2 is fixed into NH3(+). In the determinate type of nodules harbored by Rhizobium-nodulated Fabaceae species, newly synthesized NH3(+) is finally converted into allantoin (C4H6N4O3) and allantoic acid (C4H8N4O4) (ureides) through complex pathways involving at least 20 different enzymes that act synchronously in two types of nodule cells with contrasting ultrastructure, including the tree nodule cell organelles. Newly synthesized ureides are loaded into the network of nodule-root xylem vessels and transported to aerial organs by the transpirational water current. Once inside the leaves, ureides undergo an enzymatically driven reverse process to yield NH4(+) that is used for growth. This supports the role of ureides as key nitrogen (N)-compounds for the growth and yield of legumes nodulated by Rhizobium that grow in soils with a low N content. Thus, a concrete understanding of the mechanisms underlying ureide biogenesis and catabolism in legumes may help agrobiologists to achieve greater agricultural discoveries. In this review we focus on the transmembranal and transorganellar symplastic and apoplastic movement of N-precursors within the nodules, as well as on the occurrence, localization and properties of enzymes and genes involved in the biogenesis and catabolism of ureides. The synthesis and transport of ureides are not unique events in Rhizobium-nodulated N2-fixing legumes. Thus, a brief description of the synthesis and catabolism of ureides in non-legumes was included for comparison. The establishment of the symbiosis, nodule organogenesis and the plant's control of nodule number, synthesis and translocation of ureides via feed-back inhibition mechanisms are also reviewed.
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Affiliation(s)
- Bikash Baral
- Faculty of Agriculture and Forestry, University of Helsinki, P.O. Box 27, Latokartanonkaari 7, FIN-00014 Helsinki, Finland.
| | | | - Maria Luisa Izaguirre-Mayoral
- Biological Nitrogen Fixation Laboratory, Chemistry Department, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa.
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17
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Medrano-Macías J, Leija-Martínez P, González-Morales S, Juárez-Maldonado A, Benavides-Mendoza A. Use of Iodine to Biofortify and Promote Growth and Stress Tolerance in Crops. FRONTIERS IN PLANT SCIENCE 2016; 7:1146. [PMID: 27602033 PMCID: PMC4993787 DOI: 10.3389/fpls.2016.01146] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/18/2016] [Indexed: 05/06/2023]
Abstract
Iodine is not considered essential for land plants; however, in some aquatic plants, iodine plays a critical role in antioxidant metabolism. In humans, iodine is essential for the metabolism of the thyroid and for the development of cognitive abilities, and it is associated with lower risks of developing certain types of cancer. Therefore, great efforts are made to ensure the proper intake of iodine to the population, for example, the iodization of table salt. In the same way, as an alternative, the use of different iodine fertilization techniques to biofortify crops is considered an adequate iodine supply method. Hence, biofortification with iodine is an active area of research, with highly relevant results. The agricultural application of iodine to enhance growth, environmental adaptation, and stress tolerance in plants has not been well explored, although it may lead to the increased use of this element in agricultural practice and thus contribute to the biofortification of crops. This review systematically presents the results published on the application of iodine in agriculture, considering different environmental conditions and farming systems in various species and varying concentrations of the element, its chemical forms, and its application method. Some studies report beneficial effects of iodine, including better growth, and changes in the tolerance to stress and antioxidant capacity, while other studies report that the applications of iodine cause no response or even have adverse effects. We suggested different assumptions that attempt to explain these conflicting results, considering the possible interaction of iodine with other trace elements, as well as the different physicochemical and biogeochemical conditions that give rise to the distinct availability and the volatilization of the element.
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Affiliation(s)
- Julia Medrano-Macías
- Departamento de Botánica, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo LeónSan Nicolás de los Garza, Mexico
| | - Paola Leija-Martínez
- Laboratorio de Fisiología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
| | - Susana González-Morales
- Consejo Nacional de Ciencia y Tecnología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
| | | | - Adalberto Benavides-Mendoza
- Laboratorio de Fisiología, Departamento de Horticultura, Universidad Autónoma Agraria Antonio NarroSaltillo, Mexico
- *Correspondence: Adalberto Benavides-Mendoza
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18
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Coleto I, Pineda M, Rodiño AP, De Ron AM, Alamillo JM. Comparison of inhibition of N2 fixation and ureide accumulation under water deficit in four common bean genotypes of contrasting drought tolerance. ANNALS OF BOTANY 2014; 113:1071-82. [PMID: 24638821 PMCID: PMC3997645 DOI: 10.1093/aob/mcu029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 02/12/2014] [Indexed: 05/21/2023]
Abstract
BACKGROUND AND AIMS Drought is the principal constraint on world production of legume crops. There is considerable variability among genotypes in sensitivity of nitrogen fixation to drought, which has been related to accumulation of ureides in soybean. The aim of this study was to search for genotypic differences in drought sensitivity and ureide accumulation in common bean (Phaseolus vulgaris) germplasm that may be useful in the improvement of tolerance to water deficit in common bean. METHODS Changes in response to water deficit of nitrogen fixation rates, ureide content and the expression and activity of key enzymes for ureide metabolism were measured in four P. vulgaris genotypes differing in drought tolerance. KEY RESULTS A variable degree of drought-induced nitrogen fixation inhibition was found among the bean genotypes. In addition to inhibition of nitrogen fixation, there was accumulation of ureides in stems and leaves of sensitive and tolerant genotypes, although this was higher in the leaves of the most sensitive ones. In contrast, there was no accumulation of ureides in the nodules or roots of stressed plants. In addition, the level of ureides in the most sensitive genotype increased after inhibition of nitrogen fixation, suggesting that ureides originate in vegetative tissues as a response to water stress, probably mediated by the induction of allantoinase. CONCLUSIONS Variability of drought-induced inhibition of nitrogen fixation among the P. vulgaris genotypes was accompanied by subsequent accumulation of ureides in stems and leaves, but not in nodules. The results indicate that shoot ureide accumulation after prolonged exposure to drought could not be the cause of inhibition of nitrogen fixation, as has been suggested in soybean. Instead, ureides seem to be produced as part of a general response to stress, and therefore higher accumulation might correspond to higher sensitivity to the stressful conditions.
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Affiliation(s)
- I. Coleto
- Departamento de Botánica, Ecología y Fisiología Vegetal, Grupo de Fisiología Molecular y Biotecnología de Plantas del Campus de Excelencia Internacional Agroalimentario, CEIA3, Campus Rabanales, Edif. Severo Ochoa, 1 planta, Universidad de Córdoba, 14071 Córdoba, Spain
| | - M. Pineda
- Departamento de Botánica, Ecología y Fisiología Vegetal, Grupo de Fisiología Molecular y Biotecnología de Plantas del Campus de Excelencia Internacional Agroalimentario, CEIA3, Campus Rabanales, Edif. Severo Ochoa, 1 planta, Universidad de Córdoba, 14071 Córdoba, Spain
| | - A. P. Rodiño
- Departamento de Recursos Fitogenéticos, Grupo de Biología de Agrosistemas, Misión Biológica de Galicia-CSIC, El Palacio-Salcedo, 36143 Pontevedra, Spain
| | - A. M. De Ron
- Departamento de Recursos Fitogenéticos, Grupo de Biología de Agrosistemas, Misión Biológica de Galicia-CSIC, El Palacio-Salcedo, 36143 Pontevedra, Spain
| | - J. M. Alamillo
- Departamento de Botánica, Ecología y Fisiología Vegetal, Grupo de Fisiología Molecular y Biotecnología de Plantas del Campus de Excelencia Internacional Agroalimentario, CEIA3, Campus Rabanales, Edif. Severo Ochoa, 1 planta, Universidad de Córdoba, 14071 Córdoba, Spain
- For correspondence. E-mail
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19
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Richardson SJ. Tweaking the structure to radically change the function: the evolution of transthyretin from 5-hydroxyisourate hydrolase to triiodothyronine distributor to thyroxine distributor. Front Endocrinol (Lausanne) 2014; 5:245. [PMID: 25717318 PMCID: PMC4324301 DOI: 10.3389/fendo.2014.00245] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 12/23/2014] [Indexed: 11/25/2022] Open
Abstract
Often, we elucidate evolutionary processes backwards, starting with eutherian mammals and gradually climbing down the evolutionary tree to those species who have survived since long before mammals evolved. This is also true for elucidating the evolution of specific proteins, in this case, the protein currently known as "transthyretin" (TTR). TTR was first described in eutherian mammals and was known as a thyroxine (T4) binding protein. However, mammals are the exception among vertebrates in respect to the function of TTR, as in teleost fish, amphibians, reptiles and birds TTR preferentially binds triiodothyronine (T3), which is the active form of thyroid hormone (TH). The TTR gene possibly arose as a duplication of the transthyretin-like protein (TLP) gene, around the stage of the agnathans. Some vertebrate species have both the TTR and TLP genes, while others have "lost" the TLP gene. TLP genes have been found in all kingdoms. The TLPs analyzed to date do not bind THs or their analogs, but are enzymes involved in uric acid metabolism; specifically, they are 5-hydroxyisourate hydrolases. A Salmonella TLP knock-out strain demonstrated that TLP was essential for the bacteria's survival in the high uric acid environment of the chicken alimentary tract. Many other TLPs are yet to be characterized for their function although several have been confirmed as 5-hydroxyisourate hydrolases. This review describes the evolution of TLP/TTR and how subtle changes in gene structure or amino acid substitution can drastically change the function of this protein, without altering its overall 3D conformation.
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Affiliation(s)
- Samantha J. Richardson
- School of Medical Sciences, RMIT University, Bundoora, VIC, Australia
- *Correspondence: Samantha J. Richardson, School of Medical Sciences, RMIT University, PO Box 71 Bundoora, VIC 3083, Australia e-mail:
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20
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Vriet C, Russinova E, Reuzeau C. From squalene to brassinolide: the steroid metabolic and signaling pathways across the plant kingdom. MOLECULAR PLANT 2013; 6:1738-57. [PMID: 23761349 DOI: 10.1093/mp/sst096] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The plant steroid hormones, brassinosteroids (BRs), and their precursors, phytosterols, play major roles in plant growth, development, and stress tolerance. Here, we review the impressive progress made during recent years in elucidating the components of the sterol and BR metabolic and signaling pathways, and in understanding their mechanism of action in both model plants and crops, such as Arabidopsis and rice. We also discuss emerging insights into the regulations of these pathways, their interactions with other hormonal pathways and multiple environmental signals, and the putative nature of sterols as signaling molecules.
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Affiliation(s)
- Cécile Vriet
- CropDesign NV, a BASF Plant Science Company, 9052 Gent, Belgium
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21
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Gruszka D. The brassinosteroid signaling pathway-new key players and interconnections with other signaling networks crucial for plant development and stress tolerance. Int J Mol Sci 2013; 14:8740-74. [PMID: 23615468 PMCID: PMC3676754 DOI: 10.3390/ijms14058740] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/01/2013] [Accepted: 04/02/2013] [Indexed: 12/15/2022] Open
Abstract
Brassinosteroids (BRs) are a class of steroid hormones regulating a wide range of physiological processes during the plant life cycle from seed development to the modulation of flowering and senescence. The last decades, and recent years in particular, have witnessed a significant advance in the elucidation of the molecular mechanisms of BR signaling from perception by the transmembrane receptor complex to the regulation of transcription factors influencing expression of the target genes. Application of the new approaches shed light on the molecular functions of the key players regulating the BR signaling cascade and allowed identification of new factors. Recent studies clearly indicated that some of the components of BR signaling pathway act as multifunctional proteins involved in other signaling networks regulating diverse physiological processes, such as photomorphogenesis, cell death control, stomatal development, flowering, plant immunity to pathogens and metabolic responses to stress conditions, including salinity. Regulation of some of these processes is mediated through a crosstalk between BR signalosome and the signaling cascades of other hormones, including auxin, abscisic acid, ethylene and salicylic acid. Unravelling the complicated mechanisms of BR signaling and its interconnections with other molecular networks may be of great importance for future practical applications in agriculture.
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Affiliation(s)
- Damian Gruszka
- Department of Genetics, Faculty of Biology and Environment Protection, University of Silesia, Jagiellonska 28, Katowice 40-032, Poland.
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22
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Identification and bioactivity analysis of transthyretin-like protein in amphioxus: A case demonstrating divergent evolution from an enzyme to a hormone distributor. Comp Biochem Physiol B Biochem Mol Biol 2013; 164:143-50. [DOI: 10.1016/j.cbpb.2012.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/08/2012] [Accepted: 12/10/2012] [Indexed: 12/30/2022]
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23
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Michiel M, Perchat N, Perret A, Tricot S, Papeil A, Besnard M, de Berardinis V, Salanoubat M, Fischer C. Microbial urate catabolism: characterization of HpyO, a non-homologous isofunctional isoform of the flavoprotein urate hydroxylase HpxO. ENVIRONMENTAL MICROBIOLOGY REPORTS 2012; 4:642-647. [PMID: 23760935 DOI: 10.1111/j.1758-2229.2012.00390.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 08/25/2012] [Indexed: 06/02/2023]
Abstract
In aerobic cells, urate is oxidized to 5-hydroxyisourate by two distinct enzymes: a coenzyme-independent urate oxidase (EC 1.7.3.3) found in eukaryotes and bacteria like Bacillus subtilis and a prokaryotic flavoprotein urate hydroxylase (HpxO) originally found in some Klebsiella species. More cases of analogous or non-homologous isofunctional enzymes (NISE) for urate catabolism have been hypothesized by inspecting bacterial genomes. Here, we used a functional complementation approach in which a candidate gene for urate oxidation is integrated by homologous recombination in the Acinetobacter baylyi ADP1 genome at the locus of its original hpxO gene. Catabolism of urate was restored in A. baylyi ADP1 expressing a FAD-dependent protein from Xanthomonas campestris, representing a new urate hydroxylase family that we called HpyO. This enzyme was kinetically characterized and compared with other HpxO enzymes. In contrast to the latter, HpyO is a typical Michaelian enzyme. This work provides the first experimental evidences for the function of HpyO in bacterial urate catabolism and establishes it as a NISE of HpxO.
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Affiliation(s)
- Magalie Michiel
- Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), DSV, Institut de Génomique (IG), UMR8030, Evry, France; Université d'Evry Val d'Essonne (UEVE), UMR8030, Evry, France; CNRS UMR 8030, 2 rue Gaston Crémieux, F-91057, Evry Cedex, France; Laboratoire SATIE, ENSC, Université de Cergy-Pontoise, CNRS UMR 8029, 5 mail Gay Lussac, F-95031, Neuville sur Oise cedex, France
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24
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Chowdhary G, Kataya ARA, Lingner T, Reumann S. Non-canonical peroxisome targeting signals: identification of novel PTS1 tripeptides and characterization of enhancer elements by computational permutation analysis. BMC PLANT BIOLOGY 2012; 12:142. [PMID: 22882975 PMCID: PMC3487989 DOI: 10.1186/1471-2229-12-142] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Accepted: 07/13/2012] [Indexed: 05/04/2023]
Abstract
BACKGROUND High-accuracy prediction tools are essential in the post-genomic era to define organellar proteomes in their full complexity. We recently applied a discriminative machine learning approach to predict plant proteins carrying peroxisome targeting signals (PTS) type 1 from genome sequences. For Arabidopsis thaliana 392 gene models were predicted to be peroxisome-targeted. The predictions were extensively tested in vivo, resulting in a high experimental verification rate of Arabidopsis proteins previously not known to be peroxisomal. RESULTS In this study, we experimentally validated the predictions in greater depth by focusing on the most challenging Arabidopsis proteins with unknown non-canonical PTS1 tripeptides and prediction scores close to the threshold. By in vivo subcellular targeting analysis, three novel PTS1 tripeptides (QRL>, SQM>, and SDL>) and two novel tripeptide residues (Q at position -3 and D at pos. -2) were identified. To understand why, among many Arabidopsis proteins carrying the same C-terminal tripeptides, these proteins were specifically predicted as peroxisomal, the residues upstream of the PTS1 tripeptide were computationally permuted and the changes in prediction scores were analyzed. The newly identified Arabidopsis proteins were found to contain four to five amino acid residues of high predicted targeting enhancing properties at position -4 to -12 in front of the non-canonical PTS1 tripeptide. The identity of the predicted targeting enhancing residues was unexpectedly diverse, comprising besides basic residues also proline, hydroxylated (Ser, Thr), hydrophobic (Ala, Val), and even acidic residues. CONCLUSIONS Our computational and experimental analyses demonstrate that the plant PTS1 tripeptide motif is more diverse than previously thought, including an increasing number of non-canonical sequences and allowed residues. Specific targeting enhancing elements can be predicted for particular sequences of interest and are far more diverse in amino acid composition and positioning than previously assumed. Machine learning methods become indispensable to predict which specific proteins, among numerous candidate proteins carrying the same non-canonical PTS1 tripeptide, contain sufficient enhancer elements in terms of number, positioning and total strength to cause peroxisome targeting.
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Affiliation(s)
- Gopal Chowdhary
- Centre for Organelle Research, University of Stavanger, N-4036, Stavanger, Norway
- KIIT School of Biotechnology, Campus XI, KIIT University, Bhubaneswar, 751024, India
| | - Amr RA Kataya
- Centre for Organelle Research, University of Stavanger, N-4036, Stavanger, Norway
| | - Thomas Lingner
- Department of Bioinformatics, Institute for Microbiology and Genetics, D-37077, Goettingen, Germany
| | - Sigrun Reumann
- Centre for Organelle Research, University of Stavanger, N-4036, Stavanger, Norway
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25
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Abstract
Brassinosteroids (BRs) are endogenous plant hormones essential for the proper regulation of multiple physiological processes required for normal plant growth and development. Since their discovery more than 30 years ago, extensive research on the mechanisms of BR action using biochemistry, mutant studies, proteomics and genome-wide transcriptome analyses, has helped refine the BR biosynthetic pathway, identify the basic molecular components required to relay the BR signal from perception to gene regulation, and expand the known physiological responses influenced by BRs. These mechanistic advances have helped answer the intriguing question of how BRs can have such dramatic pleiotropic effects on a broad range of diverse developmental pathways and have further pointed to BR interactions with other plant hormones and environmental cues. This chapter briefly reviews historical aspects of BR research and then summarizes the current state of knowledge on BR biosynthesis, metabolism and signal transduction. Recent studies uncovering novel phosphorelays and gene regulatory networks through which BR influences both vegetative and reproductive development are examined and placed in the context of known BR physiological responses including cell elongation and division, vascular differentiation, flowering, pollen development and photomorphogenesis.
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Affiliation(s)
- Steven D Clouse
- Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609 USA
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26
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Werner AK, Witte CP. The biochemistry of nitrogen mobilization: purine ring catabolism. TRENDS IN PLANT SCIENCE 2011; 16:381-7. [PMID: 21482173 DOI: 10.1016/j.tplants.2011.03.012] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 03/10/2011] [Accepted: 03/11/2011] [Indexed: 05/20/2023]
Abstract
The enzymatic route of purine ring catabolism has recently been completed by the discovery of several novel enzymes identified through comparative genome analyses. Here, we review these recent discoveries and present an overview of purine ring catabolism in plants. Xanthine is oxidized to urate in the cytosol, followed by three enzymatic steps taking place in the peroxisome and four reactions in the endoplasmic reticulum releasing the four ring nitrogen as ammonia. Although the main physiological function of purine degradation might lie in the remobilization of nitrogen resources, it has also emerged that catabolic intermediates, the ureides allantoin and allantoate, are likely to be involved in protecting plants against abiotic stress. Conserved alternative splicing mediating the peroxisomal as well as cytosolic localization of allantoin synthase potentially links purine ring catabolism to brassinosteroid signaling.
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Affiliation(s)
- Andrea K Werner
- Department of Plant Biochemistry, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Germany
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27
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Cendron L, Ramazzina I, Percudani R, Rasore C, Zanotti G, Berni R. Probing the evolution of hydroxyisourate hydrolase into transthyretin through active-site redesign. J Mol Biol 2011; 409:504-12. [PMID: 21515285 DOI: 10.1016/j.jmb.2011.04.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 04/08/2011] [Accepted: 04/10/2011] [Indexed: 12/18/2022]
Abstract
5-Hydroxyisourate hydrolase (HIUase) and transthyretin (TTR) are closely related phylogenetically and structurally, while performing quite different functions. The former catalyzes the hydrolysis of 5-hydroxyisourate within the urate degradation pathway, and the latter is a carrier protein involved in the extracellular transport of thyroid hormones and in the cotransport of retinol. The evolution of HIUase into TTR represents a remarkable example of adaptation of a new function by active-site modification of an enzyme. On the basis of phylogenetic reconstructions and structural comparison of HIUase and TTR, two mutations (Y116T and I16A) were likely to be crucial events in order to induce, after a gene duplication event, the conversion of the enzyme into a binding protein. By rational reshaping of the active sites of HIUase and functional analyses of its mutant forms, we have provided insights into how its neofunctionalization could be achieved. We show here that the two mutations at the active sites of HIUase open up the two ends of the channel that transverses the entire tetrameric protein, generating two cavities accessible to the thyroxine molecule and abrogating, at the same time, the enzymatic activity. Our data indicate that a small number of critical mutations affecting the active site of an enzyme may be sufficient to generate a drastically different function, while a large number of additional mutations may be required for the fine-tuning of the structural and functional features of new proteins.
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Affiliation(s)
- Laura Cendron
- Department of Biological Chemistry, University of Padua, Viale Colombo 3, 35121 Padua, Italy
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28
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Reumann S. Toward a definition of the complete proteome of plant peroxisomes: Where experimental proteomics must be complemented by bioinformatics. Proteomics 2011; 11:1764-79. [PMID: 21472859 DOI: 10.1002/pmic.201000681] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Revised: 02/06/2011] [Accepted: 02/11/2011] [Indexed: 12/23/2022]
Abstract
In the past few years, proteome analysis of Arabidopsis peroxisomes has been established by the complementary efforts of four research groups and has emerged as the major unbiased approach to identify new peroxisomal proteins on a large scale. Collectively, more than 100 new candidate proteins from plant peroxisomes have been identified, including long-awaited low-abundance proteins. More than 50 proteins have been validated as peroxisome targeted, nearly doubling the number of established plant peroxisomal proteins. Sequence homologies of the new proteins predict unexpected enzyme activities, novel metabolic pathways and unknown non-metabolic peroxisome functions. Despite this remarkable success, proteome analyses of plant peroxisomes remain highly material intensive and require major preparative efforts. Characterization of the membrane proteome or post-translational protein modifications poses major technical challenges. New strategies, including quantitative mass spectrometry methods, need to be applied to allow further identifications of plant peroxisomal proteins, such as of stress-inducible proteins. In the long process of defining the complete proteome of plant peroxisomes, the prediction of peroxisome-targeted proteins from plant genome sequences emerges as an essential complementary approach to identify additional peroxisomal proteins that are, for instance, specific to peroxisome variants from minor tissues and organs or to abiotically stressed model and crop plants.
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Affiliation(s)
- Sigrun Reumann
- Centre for Organelle Research, University of Stavanger, Stavanger, Norway.
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