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Wang JY, Cai YY, Li L, Zhu XM, Shen ZF, Wang ZH, Liao J, Lu JP, Liu XH, Lin FC. Dihydroorotase MoPyr4 is required for development, pathogenicity, and autophagy in rice blast fungus. Cell Commun Signal 2024; 22:362. [PMID: 39010102 PMCID: PMC11247805 DOI: 10.1186/s12964-024-01741-4] [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: 03/29/2024] [Accepted: 07/06/2024] [Indexed: 07/17/2024] Open
Abstract
Dihydroorotase (DHOase) is the third enzyme in the six enzymatic reaction steps of the endogenous pyrimidine nucleotide de novo biosynthesis pathway, which is a metabolic pathway conserved in both bacteria and eukaryotes. However, research on the biological function of DHOase in plant pathogenic fungi is very limited. In this study, we identified and named MoPyr4, a homologous protein of Saccharomyces cerevisiae DHOase Ura4, in the rice blast fungus Magnaporthe oryzae and investigated its ability to regulate fungal growth, pathogenicity, and autophagy. Deletion of MoPYR4 led to defects in growth, conidiation, appressorium formation, the transfer and degradation of glycogen and lipid droplets, appressorium turgor accumulation, and invasive hypha expansion in M. oryzae, which eventually resulted in weakened fungal pathogenicity. Long-term replenishment of exogenous uridine-5'-phosphate (UMP) can effectively restore the phenotype and virulence of the ΔMopyr4 mutant. Further study revealed that MoPyr4 also participated in the regulation of the Pmk1-MAPK signaling pathway, co-localized with peroxisomes for the oxidative stress response, and was involved in the regulation of the Osm1-MAPK signaling pathway in response to hyperosmotic stress. In addition, MoPyr4 interacted with MoAtg5, the core protein involved in autophagy, and positively regulated autophagic degradation. Taken together, our results suggested that MoPyr4 for UMP biosynthesis was crucial for the development and pathogenicity of M. oryzae. We also revealed that MoPyr4 played an essential role in the external stress response and pathogenic mechanism through participation in the Pmk1-MAPK signaling pathway, peroxisome-related oxidative stress response mechanism, the Osm1-MAPK signaling pathway and the autophagy pathway.
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Affiliation(s)
- Jing-Yi Wang
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Ying-Ying Cai
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Lin Li
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Xue-Ming Zhu
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Zi-Fang Shen
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Zi-He Wang
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Jian Liao
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Jian-Ping Lu
- College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiao-Hong Liu
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Fu-Cheng Lin
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China.
- Xianghu Laboratory, State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China.
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2
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Liu H, Xu Y, Sun Y, Wu H, Hou J. Tissue-specific toxic effects of nano-copper on zebrafish. ENVIRONMENTAL RESEARCH 2024; 242:117717. [PMID: 37993046 DOI: 10.1016/j.envres.2023.117717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 09/23/2023] [Accepted: 11/15/2023] [Indexed: 11/24/2023]
Abstract
Understanding the behavior and potential toxicity of copper nanoparticles (nano-Cu) in the aquatic environment is a primary way to assess their environmental risks. In this study, RNA-seq was performed on three different tissues (gills, intestines, and muscles) of zebrafish exposed to nano-Cu, to explore the potential toxic mechanism of nano-Cu on zebrafish. The results indicated that the toxic mechanism of nano-Cu on zebrafish was tissue-specific. Nano-Cu enables the CB1 receptor of the presynaptic membrane of gill cells to affect short-term synaptic plasticity or long-term synaptic changes (ECB-LTD) through DSI and DSE, causing dysfunction of intercellular signal transmission. Imbalance of de novo synthesis of UMP in intestinal cells and its transformation to UDP, UTP, uridine, and uracil, resulted in many functions involved in the pyrimidine metabolic pathway being blocked. Meanwhile, the toxicity of nano-Cu caused abnormal expression of RAD51 gene in muscle cells, which affects the repair of damaged DNA through Fanconi anemia and homologous recombination pathway, thus causing cell cycle disorder. These results provide insights for us to better understand the differences in toxicity of nano-Cu on zebrafish tissues and are helpful for a comprehensive assessment of nano-Cu's effects on aquatic organisms.
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Affiliation(s)
- Haiqiang Liu
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China; Key Laboratory of Mass Spectrometry Imaging and Metabolomics (State Ethnic Affairs Commission), Centre for Imaging & Systems Biology, Minzu University of China, Beijing, 100081, China
| | - Yanli Xu
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Yuqiong Sun
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Haodi Wu
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China
| | - Jing Hou
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China.
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3
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Hinojosa-Cruz A, Díaz-Sánchez ÁG, Díaz-Vilchis A, González-Segura L. Structural and functional properties of uridine 5'-monophosphate synthase from Coffea arabica. Int J Biol Macromol 2024; 259:129226. [PMID: 38184030 DOI: 10.1016/j.ijbiomac.2024.129226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 12/23/2023] [Accepted: 01/02/2024] [Indexed: 01/08/2024]
Abstract
In higher eukaryotes and plants, the last two sequential steps in the de novo biosynthesis of uridine 5'-monophosphate (UMP) are catalyzed by a bifunctional natural chimeric protein called UMP synthase (UMPS). In higher plants, UMPS consists of two naturally fused enzymes: orotate phosphoribosyltransferase (OPRTase) at N-terminal and orotidine-5'-monophosphate decarboxylase (ODCase) at C-terminal. In this work, we obtained the full functional recombinant protein UMPS from Coffea arabica (CaUMPS) and studied its structure-function relationships. A biochemical and structural characterization of a plant UMPS with its two functional domains is described together with the presentation of the first crystal structure of a plant ODCase at 1.4 Å resolution. The kinetic parameters measured of CaOPRTase and CaODCase domains were comparable to those reported. The crystallographic structure revealed that CaODCase is a dimer that conserves the typical fold observed in other ODCases from prokaryote and eukaryote with a 1-deoxy-ribofuranose-5'-phosphate molecule bound in the active site of one subunit induced a closed conformation. Our results add to the knowledge of one of the key enzymes of the de novo biosynthesis of pyrimidines in plant metabolism and open the door to future applications.
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Affiliation(s)
- Alexis Hinojosa-Cruz
- Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
| | - Ángel G Díaz-Sánchez
- Departamento de Ciencias Químico Biológicas, Instituto de Ciencias Biomédicas, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez 32310, Chihuahua, Mexico
| | - Adelaida Díaz-Vilchis
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Chamilpa, Cuernavaca, Morelos 62240, Mexico
| | - Lilian González-Segura
- Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico.
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4
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Bellin L, Melzer M, Hilo A, Garza Amaya DL, Keller I, Meurer J, Möhlmann T. Nucleotide Limitation Results in Impaired Photosynthesis, Reduced Growth and Seed Yield Together with Massively Altered Gene Expression. PLANT & CELL PHYSIOLOGY 2023; 64:1494-1510. [PMID: 37329302 DOI: 10.1093/pcp/pcad063] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 05/04/2023] [Accepted: 06/16/2023] [Indexed: 06/19/2023]
Abstract
Nucleotide limitation and imbalance is a well-described phenomenon in animal research but understudied in the plant field. A peculiarity of pyrimidine de novo synthesis in plants is the complex subcellular organization. Here, we studied two organellar localized enzymes in the pathway, with chloroplast aspartate transcarbamoylase (ATC) and mitochondrial dihydroorotate dehydrogenase (DHODH). ATC knock-downs were most severely affected, exhibiting low levels of pyrimidine nucleotides, a low energy state, reduced photosynthetic capacity and accumulation of reactive oxygen species. Furthermore, altered leaf morphology and chloroplast ultrastructure were observed in ATC mutants. Although less affected, DHODH knock-down mutants showed impaired seed germination and altered mitochondrial ultrastructure. Thus, DHODH might not only be regulated by respiration but also exert a regulatory function on this process. Transcriptome analysis of an ATC-amiRNA line revealed massive alterations in gene expression with central metabolic pathways being downregulated and stress response and RNA-related pathways being upregulated. In addition, genes involved in central carbon metabolism, intracellular transport and respiration were markedly downregulated in ATC mutants, being most likely responsible for the observed impaired growth. We conclude that impairment of the first committed step in pyrimidine metabolism, catalyzed by ATC, leads to nucleotide limitation and by this has far-reaching consequences on metabolism and gene expression. DHODH might closely interact with mitochondrial respiration, as seen in delayed germination, which is the reason for its localization in this organelle.
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Affiliation(s)
- Leo Bellin
- Pflanzenphysiologie, Fachbereich Biologie, Universität Kaiserslautern, Erwin-Schrödinger-Straße, Kaiserslautern D-67663, Germany
| | - Michael Melzer
- Leibniz Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstrasse 3, Seeland, OT Gatersleben 06466, Germany
| | - Alexander Hilo
- Leibniz Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstrasse 3, Seeland, OT Gatersleben 06466, Germany
| | - Diana Laura Garza Amaya
- Pflanzenphysiologie, Fachbereich Biologie, Universität Kaiserslautern, Erwin-Schrödinger-Straße, Kaiserslautern D-67663, Germany
| | - Isabel Keller
- Pflanzenphysiologie, Fachbereich Biologie, Universität Kaiserslautern, Erwin-Schrödinger-Straße, Kaiserslautern D-67663, Germany
| | - Jörg Meurer
- Plant Sciences, Department Biology I, Ludwig-Maximilians-University Munich, Großhaderner Straße 2-4, Planegg-Martinsried 82152, Germany
| | - Torsten Möhlmann
- Pflanzenphysiologie, Fachbereich Biologie, Universität Kaiserslautern, Erwin-Schrödinger-Straße, Kaiserslautern D-67663, Germany
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5
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Babai R, Izrael R, Vértessy BG. Characterization of the dynamics of Plasmodium falciparum deoxynucleotide-triphosphate pool in a stage-specific manner. Sci Rep 2022; 12:19926. [PMID: 36402851 PMCID: PMC9675800 DOI: 10.1038/s41598-022-23807-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 11/06/2022] [Indexed: 11/21/2022] Open
Abstract
Understanding and characterizing the molecular background of the maintenance of genomic integrity might be a major factor in comprehending the exceptional ability of the malaria parasite, Plasmodium falciparum to adapt at a fast pace to antimalarials. A balanced nucleotide pool is an essential factor for high-fidelity replication. The lack of detailed studies on deoxynucleotide-triphosphate (dNTP) pools in various intraerythrocytic stages of Plasmodium falciparum motivated our present study. Here, we focused on the building blocks of DNA and utilized an EvaGreen-based dNTP incorporation assay to successfully measure the temporal dynamics of dNTPs in every intraerythrocytic stage and in drug-treated trophozoites. Our findings show that the ratio of dNTPs in the ring-stage parasites significantly differs from the more mature trophozoite and schizont stages. We were also able to detect dGTP levels that have never been shown before and found it to be the least abundant dNTP in all stages. Treatment with WR99210, a TS-DHFR inhibitor drug, affected not only dTTP, but also dGTP levels, despite its presumed selective action on pyrimidine biosynthesis. Results from our studies might assist in a better understanding of genome integrity mechanisms and may potentially lead to novel drug related aspects involving purine and pyrimidine metabolic targets.
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Affiliation(s)
- Réka Babai
- grid.425578.90000 0004 0512 3755Malaria Research Laboratory, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, 1117 Hungary ,grid.6759.d0000 0001 2180 0451George A. Olah Doctoral School of Chemistry and Chemical Technology, BME Budapest University of Technology and Economics, Budapest, 1111 Hungary ,grid.6759.d0000 0001 2180 0451Department of Applied Biotechnology and Food Sciences, BME Budapest University of Technology and Economics, Budapest, 1111 Hungary
| | - Richard Izrael
- grid.425578.90000 0004 0512 3755Malaria Research Laboratory, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, 1117 Hungary ,grid.9008.10000 0001 1016 9625Doctoral School of Multidisciplinary Medical Sciences, University of Szeged, Szeged, 6720 Hungary
| | - Beáta G. Vértessy
- grid.425578.90000 0004 0512 3755Malaria Research Laboratory, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, 1117 Hungary ,grid.6759.d0000 0001 2180 0451Department of Applied Biotechnology and Food Sciences, BME Budapest University of Technology and Economics, Budapest, 1111 Hungary
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6
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Identification of novel Plasmodium falciparum dihydroorotate dehydrogenase inhibitors for malaria using in silico studies. SCIENTIFIC AFRICAN 2022. [DOI: 10.1016/j.sciaf.2022.e01214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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7
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Lemieux H, Blier PU. Exploring Thermal Sensitivities and Adaptations of Oxidative Phosphorylation Pathways. Metabolites 2022; 12:metabo12040360. [PMID: 35448547 PMCID: PMC9025460 DOI: 10.3390/metabo12040360] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/08/2022] [Accepted: 04/11/2022] [Indexed: 12/20/2022] Open
Abstract
Temperature shifts are a major challenge to animals; they drive adaptations in organisms and species, and affect all physiological functions in ectothermic organisms. Understanding the origin and mechanisms of these adaptations is critical for determining whether ectothermic organisms will be able to survive when faced with global climate change. Mitochondrial oxidative phosphorylation is thought to be an important metabolic player in this regard, since the capacity of the mitochondria to produce energy greatly varies according to temperature. However, organism survival and fitness depend not only on how much energy is produced, but, more precisely, on how oxidative phosphorylation is affected and which step of the process dictates thermal sensitivity. These questions need to be addressed from a new perspective involving a complex view of mitochondrial oxidative phosphorylation and its related pathways. In this review, we examine the effect of temperature on the commonly measured pathways, but mainly focus on the potential impact of lesser-studied pathways and related steps, including the electron-transferring flavoprotein pathway, glycerophosphate dehydrogenase, dihydroorotate dehydrogenase, choline dehydrogenase, proline dehydrogenase, and sulfide:quinone oxidoreductase. Our objective is to reveal new avenues of research that can address the impact of temperature on oxidative phosphorylation in all its complexity to better portray the limitations and the potential adaptations of aerobic metabolism.
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Affiliation(s)
- Hélène Lemieux
- Faculty Saint-Jean, Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6C 4G9, Canada
- Correspondence: (H.L.); (P.U.B.)
| | - Pierre U. Blier
- Department Biologie, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada
- Correspondence: (H.L.); (P.U.B.)
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8
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Aguilera A, Berdun F, Bartoli C, Steelheart C, Alegre M, Bayir H, Tyurina YY, Kagan VE, Salerno G, Pagnussat G, Martin MV. C-ferroptosis is an iron-dependent form of regulated cell death in cyanobacteria. J Cell Biol 2022; 221:212878. [PMID: 34817556 PMCID: PMC8624678 DOI: 10.1083/jcb.201911005] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 09/29/2021] [Accepted: 11/05/2021] [Indexed: 12/30/2022] Open
Abstract
Ferroptosis is an oxidative and iron-dependent form of regulated cell death (RCD) recently described in eukaryotic organisms like animals, plants, and parasites. Here, we report that a similar process takes place in the photosynthetic prokaryote Synechocystis sp. PCC 6803 in response to heat stress. After a heat shock, Synechocystis sp. PCC 6803 cells undergo a cell death pathway that can be suppressed by the canonical ferroptosis inhibitors, CPX, vitamin E, Fer-1, liproxstatin-1, glutathione (GSH), or ascorbic acid (AsA). Moreover, as described for eukaryotic ferroptosis, this pathway is characterized by an early depletion of the antioxidants GSH and AsA, and by lipid peroxidation. These results indicate that all of the hallmarks described for eukaryotic ferroptosis are conserved in photosynthetic prokaryotes and suggest that ferroptosis might be an ancient cell death program.
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Affiliation(s)
- Anabella Aguilera
- Instituto de Investigaciones en Biodiversidad y Biotecnología (INBIOTEC-CONICET), Fundación para Investigaciones Biológicas Aplicadas (CIB-FIBA), Mar del Plata, Argentina
| | - Federico Berdun
- Instituto de Investigaciones en Biodiversidad y Biotecnología (INBIOTEC-CONICET), Fundación para Investigaciones Biológicas Aplicadas (CIB-FIBA), Mar del Plata, Argentina
| | - Carlos Bartoli
- Instituto de Fisiología Vegetal (INFIVE), Facultades de Ciencias Agrarias y Forestales y de Ciencias Naturales y Museo, Universidad Nacional de La Plata, CCT-CONICET La Plata, La Plata, Argentina
| | - Charlotte Steelheart
- Instituto de Fisiología Vegetal (INFIVE), Facultades de Ciencias Agrarias y Forestales y de Ciencias Naturales y Museo, Universidad Nacional de La Plata, CCT-CONICET La Plata, La Plata, Argentina
| | - Matías Alegre
- Instituto de Fisiología Vegetal (INFIVE), Facultades de Ciencias Agrarias y Forestales y de Ciencias Naturales y Museo, Universidad Nacional de La Plata, CCT-CONICET La Plata, La Plata, Argentina
| | - Hülya Bayir
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA.,Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA.,Children's Neuroscience Institute, University of Pittsburgh, Pittsburgh, PA.,Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA.,Departments of Environmental and Occupational Health, Chemistry, Pharmacology and Chemical Biology, Radiation Oncology, University of Pittsburgh, Pittsburgh, PA
| | - Yulia Y Tyurina
- Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA.,Departments of Environmental and Occupational Health, Chemistry, Pharmacology and Chemical Biology, Radiation Oncology, University of Pittsburgh, Pittsburgh, PA
| | - Valerian E Kagan
- Children's Neuroscience Institute, University of Pittsburgh, Pittsburgh, PA.,Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA.,Departments of Environmental and Occupational Health, Chemistry, Pharmacology and Chemical Biology, Radiation Oncology, University of Pittsburgh, Pittsburgh, PA.,Institute for Regenerative Medicine, IM Sechenov Moscow State Medical University, Moscow, Russia
| | - Graciela Salerno
- Instituto de Investigaciones en Biodiversidad y Biotecnología (INBIOTEC-CONICET), Fundación para Investigaciones Biológicas Aplicadas (CIB-FIBA), Mar del Plata, Argentina
| | - Gabriela Pagnussat
- Instituto de investigaciones Biológicas IIB-CONICET, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - María Victoria Martin
- Instituto de Investigaciones en Biodiversidad y Biotecnología (INBIOTEC-CONICET), Fundación para Investigaciones Biológicas Aplicadas (CIB-FIBA), Mar del Plata, Argentina
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9
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Bouwknegt J, Koster CC, Vos AM, Ortiz-Merino RA, Wassink M, Luttik MAH, van den Broek M, Hagedoorn PL, Pronk JT. Class-II dihydroorotate dehydrogenases from three phylogenetically distant fungi support anaerobic pyrimidine biosynthesis. Fungal Biol Biotechnol 2021; 8:10. [PMID: 34656184 PMCID: PMC8520639 DOI: 10.1186/s40694-021-00117-4] [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: 07/29/2021] [Accepted: 10/02/2021] [Indexed: 11/10/2022] Open
Abstract
Background In most fungi, quinone-dependent Class-II dihydroorotate dehydrogenases (DHODs) are essential for pyrimidine biosynthesis. Coupling of these Class-II DHODHs to mitochondrial respiration makes their in vivo activity dependent on oxygen availability. Saccharomyces cerevisiae and closely related yeast species harbor a cytosolic Class-I DHOD (Ura1) that uses fumarate as electron acceptor and thereby enables anaerobic pyrimidine synthesis. Here, we investigate DHODs from three fungi (the Neocallimastigomycete Anaeromyces robustus and the yeasts Schizosaccharomyces japonicus and Dekkera bruxellensis) that can grow anaerobically but, based on genome analysis, only harbor a Class-II DHOD. Results Heterologous expression of putative Class-II DHOD-encoding genes from fungi capable of anaerobic, pyrimidine-prototrophic growth (Arura9, SjURA9, DbURA9) in an S. cerevisiae ura1Δ strain supported aerobic as well as anaerobic pyrimidine prototrophy. A strain expressing DbURA9 showed delayed anaerobic growth without pyrimidine supplementation. Adapted faster growing DbURA9-expressing strains showed mutations in FUM1, which encodes fumarase. GFP-tagged SjUra9 and DbUra9 were localized to S. cerevisiae mitochondria, while ArUra9, whose sequence lacked a mitochondrial targeting sequence, was localized to the yeast cytosol. Experiments with cell extracts showed that ArUra9 used free FAD and FMN as electron acceptors. Expression of SjURA9 in S. cerevisiae reproducibly led to loss of respiratory competence and mitochondrial DNA. A cysteine residue (C265 in SjUra9) in the active sites of all three anaerobically active Ura9 orthologs was shown to be essential for anaerobic activity of SjUra9 but not of ArUra9. Conclusions Activity of fungal Class-II DHODs was long thought to be dependent on an active respiratory chain, which in most fungi requires the presence of oxygen. By heterologous expression experiments in S. cerevisiae, this study shows that phylogenetically distant fungi independently evolved Class-II dihydroorotate dehydrogenases that enable anaerobic pyrimidine biosynthesis. Further structure–function studies are required to understand the mechanistic basis for the anaerobic activity of Class-II DHODs and an observed loss of respiratory competence in S. cerevisiae strains expressing an anaerobically active DHOD from Sch. japonicus. Supplementary Information The online version contains supplementary material available at 10.1186/s40694-021-00117-4.
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Affiliation(s)
- Jonna Bouwknegt
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Charlotte C Koster
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Aurin M Vos
- Wageningen Plant Research, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Raúl A Ortiz-Merino
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Mats Wassink
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Marijke A H Luttik
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Marcel van den Broek
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Peter L Hagedoorn
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Jack T Pronk
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands.
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10
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Butenko A, Opperdoes FR, Flegontova O, Horák A, Hampl V, Keeling P, Gawryluk RMR, Tikhonenkov D, Flegontov P, Lukeš J. Evolution of metabolic capabilities and molecular features of diplonemids, kinetoplastids, and euglenids. BMC Biol 2020; 18:23. [PMID: 32122335 PMCID: PMC7052976 DOI: 10.1186/s12915-020-0754-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 02/17/2020] [Indexed: 12/24/2022] Open
Abstract
Background The Euglenozoa are a protist group with an especially rich history of evolutionary diversity. They include diplonemids, representing arguably the most species-rich clade of marine planktonic eukaryotes; trypanosomatids, which are notorious parasites of medical and veterinary importance; and free-living euglenids. These different lifestyles, and particularly the transition from free-living to parasitic, likely require different metabolic capabilities. We carried out a comparative genomic analysis across euglenozoan diversity to see how changing repertoires of enzymes and structural features correspond to major changes in lifestyles. Results We find a gradual loss of genes encoding enzymes in the evolution of kinetoplastids, rather than a sudden decrease in metabolic capabilities corresponding to the origin of parasitism, while diplonemids and euglenids maintain more metabolic versatility. Distinctive characteristics of molecular machines such as kinetochores and the pre-replication complex that were previously considered specific to parasitic kinetoplastids were also identified in their free-living relatives. Therefore, we argue that they represent an ancestral rather than a derived state, as thought until the present. We also found evidence of ancient redundancy in systems such as NADPH-dependent thiol-redox. Only the genus Euglena possesses the combination of trypanothione-, glutathione-, and thioredoxin-based systems supposedly present in the euglenozoan common ancestor, while other representatives of the phylum have lost one or two of these systems. Lastly, we identified convergent losses of specific metabolic capabilities between free-living kinetoplastids and ciliates. Although this observation requires further examination, it suggests that certain eukaryotic lineages are predisposed to such convergent losses of key enzymes or whole pathways. Conclusions The loss of metabolic capabilities might not be associated with the switch to parasitic lifestyle in kinetoplastids, and the presence of a highly divergent (or unconventional) kinetochore machinery might not be restricted to this protist group. The data derived from the transcriptomes of free-living early branching prokinetoplastids suggests that the pre-replication complex of Trypanosomatidae is a highly divergent version of the conventional machinery. Our findings shed light on trends in the evolution of metabolism in protists in general and open multiple avenues for future research.
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Affiliation(s)
- Anzhelika Butenko
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice (Budweis), Czech Republic.,Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Fred R Opperdoes
- de Duve Institute, Université Catholique de Louvain, Brussels, Belgium
| | - Olga Flegontova
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice (Budweis), Czech Republic.,Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Aleš Horák
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice (Budweis), Czech Republic.,Faculty of Science, University of South Bohemia, České Budějovice (Budweis), Czech Republic
| | - Vladimír Hampl
- Faculty of Science, Charles University, Biocev, Vestec, Czech Republic
| | - Patrick Keeling
- Department of Botany, University of British Columbia, Vancouver, Canada
| | | | - Denis Tikhonenkov
- Department of Botany, University of British Columbia, Vancouver, Canada.,Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Russia
| | - Pavel Flegontov
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice (Budweis), Czech Republic. .,Faculty of Science, University of Ostrava, Ostrava, Czech Republic. .,Present address: Department of Genetics, Harvard Medical School, Boston, USA.
| | - Julius Lukeš
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice (Budweis), Czech Republic. .,Faculty of Science, University of South Bohemia, České Budějovice (Budweis), Czech Republic.
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11
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Scossa F, Fernie AR. The evolution of metabolism: How to test evolutionary hypotheses at the genomic level. Comput Struct Biotechnol J 2020; 18:482-500. [PMID: 32180906 PMCID: PMC7063335 DOI: 10.1016/j.csbj.2020.02.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 01/21/2023] Open
Abstract
The origin of primordial metabolism and its expansion to form the metabolic networks extant today represent excellent systems to study the impact of natural selection and the potential adaptive role of novel compounds. Here we present the current hypotheses made on the origin of life and ancestral metabolism and present the theories and mechanisms by which the large chemical diversity of plants might have emerged along evolution. In particular, we provide a survey of statistical methods that can be used to detect signatures of selection at the gene and population level, and discuss potential and limits of these methods for investigating patterns of molecular adaptation in plant metabolism.
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Affiliation(s)
- Federico Scossa
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, 14476 Potsdam-Golm, Germany
- Council for Agricultural Research and Economics (CREA), Research Centre for Genomics and Bioinformatics (CREA-GB), Via Ardeatina 546, 00178 Rome, Italy
| | - Alisdair R. Fernie
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, 14476 Potsdam-Golm, Germany
- Center of Plant Systems Biology and Biotechnology (CPSBB), Plovdiv, Bulgaria
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12
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Liu LL, You J, Zhu Z, Chen KY, Hu MM, Gu H, Liu ZW, Wang ZY, Wang YH, Liu SJ, Chen LM, Liu X, Tian YL, Zhou SR, Jiang L, Wan JM. WHITE STRIPE LEAF8, encoding a deoxyribonucleoside kinase, is involved in chloroplast development in rice. PLANT CELL REPORTS 2020; 39:19-33. [PMID: 31485784 DOI: 10.1007/s00299-019-02470-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Accepted: 08/29/2019] [Indexed: 06/10/2023]
Abstract
WSL8 encoding a deoxyribonucleoside kinase (dNK) that catalyzes the first step in the salvage pathway of nucleotide synthesis plays an important role in early chloroplast development in rice. The chloroplast is an organelle that converts light energy into chemical energy; therefore, the normal differentiation and development of chloroplast are pivotal for plant survival. Deoxyribonucleoside kinases (dNKs) play an important role in the salvage pathway of nucleotides. However, the relationship between dNKs and chloroplast development remains elusive. Here, we identified a white stripe leaf 8 (wsl8) mutant that exhibited a white stripe leaf phenotype at seedling stage (before the four-leaf stage). The mutant showed a significantly lower chlorophyll content and defective chloroplast morphology, whereas higher reactive oxygen species than the wild type. As the leaf developed, the chlorotic mutant plants gradually turned green, accompanied by the restoration in chlorophyll accumulation and chloroplast ultrastructure. Map-based cloning revealed that WSL8 encodes a dNK on chromosome 5. Compared with the wild type, a C-to-G single base substitution occurred in the wsl8 mutant, which caused a missense mutation (Leu 349 Val) and significantly reduced dNK enzyme activity. A subcellular localization experiment showed the WSL8 protein was targeted in the chloroplast and its transcripts were expressed in various tissues, with more abundance in young leaves and nodes. Ribosome and RNA-sequencing analysis indicated that some components and genes related to ribosome biosynthesis were down-regulated in the mutant. An exogenous feeding experiment suggested that the WSL8 performed the enzymic activity of thymidine kinase, especially functioning in the salvage synthesis of thymidine monophosphate. Our results highlight that the salvage pathway mediated by the dNK is essential for early chloroplast development in rice.
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Affiliation(s)
- L L Liu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - J You
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - Z Zhu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - K Y Chen
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - M M Hu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - H Gu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - Z W Liu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - Z Y Wang
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - Y H Wang
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - S J Liu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - L M Chen
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - X Liu
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - Y L Tian
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - S R Zhou
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - L Jiang
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China
| | - J M Wan
- State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China.
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
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13
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Thillainayagam M, Malathi K, Ramaiah S. In-Silico molecular docking and simulation studies on novel chalcone and flavone hybrid derivatives with 1, 2, 3-triazole linkage as vital inhibitors of Plasmodium falciparum dihydroorotate dehydrogenase. J Biomol Struct Dyn 2017; 36:3993-4009. [DOI: 10.1080/07391102.2017.1404935] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Mahalakshmi Thillainayagam
- Medical & Biological Computing Laboratory, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, TamilNadu, India
| | - Kullappan Malathi
- Medical & Biological Computing Laboratory, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, TamilNadu, India
| | - Sudha Ramaiah
- Medical & Biological Computing Laboratory, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, TamilNadu, India
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14
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Shen W, Ren X, Zhu J, Xu Y, Lin J, Li Y, Zhao F, Zheng H, Li R, Cui X, Zhang X, Lu X, Zheng Z. Discovery of a new structural class of competitive hDHODH inhibitors with in vitro and in vivo anti-inflammatory, immunosuppressive effects. Eur J Pharmacol 2016; 791:205-212. [PMID: 27597161 DOI: 10.1016/j.ejphar.2016.09.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 09/02/2016] [Accepted: 09/02/2016] [Indexed: 11/19/2022]
Abstract
Human dihydroorotate dehydrogenase (hDHODH) is an inner mitochondrial membrane enzyme that involves in the fourth step of the biosynthesis of pyrimidine base. Inhibitors of hDHODH have been proven efficacy for the treatments of inflammation, rheumatoid arthritis, multiple sclerosis and cancer. In the present study, ascochlorin (ASC) and its derivatives, natural compounds from fungal metabolites, were discovered as hDHODH inhibitors by high-throughput screening. Enzyme kinetics studies showed that ASC competitively binds to hDHODH at the site of coenzyme Q substrate. In ex vivo study, ASC significantly inhibited the ConA-stimulated T lymphocytes proliferation and interleukin-2, interferon-γ production. Furthermore, ASC showed significant in vivo anti-inflammatory and immunosuppressive effects on the mice ears swelling, allogenic skin grafts and rat collagen-induced arthritis animal disease models. ASC significantly reduced ears edema level of mice, increased the survival time of allogenic skin implanted on the mice and attenuated arthritis severity of rat model. In conclusion, ASC was identified as a new structural class of hDHODH inhibitors with efficient anti-inflammatory, immunosuppressive activity, and may be a promising candidate for the development of new therapy in the treatment of autoimmune diseases.
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Affiliation(s)
- Wenbin Shen
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Xiao Ren
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Jingtong Zhu
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Yan Xu
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Jie Lin
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Yeying Li
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Feng Zhao
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Haizhou Zheng
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Ruolan Li
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Xiaolan Cui
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Xuexia Zhang
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China
| | - Xinhua Lu
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China.
| | - Zhihui Zheng
- New Drug Research & Development Center, North China Pharmaceutical Group Corporation, National Microbial Medicine Engineering & Research Center, Hebei Industry Microbial Metabolic Engineering & Technology Research Center, No. 388 Heping East Road, Shijiazhuang 050015, Hebei, China.
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15
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Krungkrai SR, Krungkrai J. Insights into the pyrimidine biosynthetic pathway of human malaria parasite Plasmodium falciparum as chemotherapeutic target. ASIAN PAC J TROP MED 2016; 9:525-34. [PMID: 27262062 DOI: 10.1016/j.apjtm.2016.04.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/16/2016] [Accepted: 04/08/2016] [Indexed: 11/25/2022] Open
Abstract
Malaria is a major cause of morbidity and mortality in humans. Artemisinins remain as the first-line treatment for Plasmodium falciparum (P. falciparum) malaria although drug resistance has already emerged and spread in Southeast Asia. Thus, to fight this disease, there is an urgent need to develop new antimalarial drugs for malaria chemotherapy. Unlike human host cells, P. falciparum cannot salvage preformed pyrimidine bases or nucleosides from the extracellular environment and relies solely on nucleotides synthesized through the de novo biosynthetic pathway. This review presents significant progress on understanding the de novo pyrimidine pathway and the functional enzymes in the human parasite P. falciparum. Current knowledge in genomics and metabolomics are described, particularly focusing on the parasite purine and pyrimidine nucleotide metabolism. These include gene annotation, characterization and molecular mechanism of the enzymes that are different from the human host pathway. Recent elucidation of the three-dimensional crystal structures and the catalytic reactions of three enzymes: dihydroorotate dehydrogenase, orotate phosphoribosyltransferase, and orotidine 5'-monophosphate decarboxylase, as well as their inhibitors are reviewed in the context of their therapeutic potential against malaria.
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Affiliation(s)
- Sudaratana R Krungkrai
- Unit of Biochemistry, Department of Medical Science, Faculty of Science, Rangsit University, Pathumthani 12000, Thailand
| | - Jerapan Krungkrai
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand.
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16
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Xu J, Zhang L, Yang DL, Li Q, He Z. Thymidine kinases share a conserved function for nucleotide salvage and play an essential role in Arabidopsis thaliana growth and development. THE NEW PHYTOLOGIST 2015; 208:1089-1103. [PMID: 26139575 DOI: 10.1111/nph.13530] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 05/23/2015] [Indexed: 06/04/2023]
Abstract
Thymidine kinases (TKs) are important components in the nucleotide salvage pathway. However, knowledge about plant TKs is quite limited. In this study, the molecular function of TKs in Arabidopsis thaliana was investigated. Two TKs were identified and named AtTK1 and AtTK2. Expression of both genes was ubiquitous, but AtTK1 was strongly expressed in high-proliferation tissues. AtTK1 was localized to the cytosol, whereas AtTK2 was localized to the mitochondria. Mutant analysis indicated that the two genes function coordinately to sustain normal plant development. Enzymatic assays showed that the two TK proteins shared similar catalytic specificity for pyrimidine nucleosides. They were able to complement an Escherichia coli strain lacking TK activity. 5'-Fluorodeoxyuridine (FdU) resistance and 5-ethynyl 2'-deoxyuridine (EdU) incorporation assays confirmed their activity in vivo. Furthermore, the tk mutant phenotype could be alleviated by nucleotide feeding, establishing that the biosynthesis of pyrimidine nucleotides was disrupted by the TK deficiency. Finally, both human and rice (Oryza sativa) TKs were able to rescue the tk mutants, demonstrating the functional conservation of TKs across organisms. Taken together, our findings clarify the specialized function of two TKs in A. thaliana and establish that the salvage pathway mediated by the kinases is essential for plant growth and development.
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Affiliation(s)
- Jing Xu
- National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Lin Zhang
- National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Dong-Lei Yang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Qun Li
- National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Zuhua He
- National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
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17
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Pyrimidine Metabolism: Dynamic and Versatile Pathways in Pathogens and Cellular Development. J Genet Genomics 2015; 42:195-205. [PMID: 26059768 DOI: 10.1016/j.jgg.2015.04.004] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 04/13/2015] [Accepted: 04/14/2015] [Indexed: 11/21/2022]
Abstract
The importance of pyrimidines lies in the fact that they are structural components of a broad spectrum of key molecules that participate in diverse cellular functions, such as synthesis of DNA, RNA, lipids, and carbohydrates. Pyrimidine metabolism encompasses all enzymes involved in the synthesis, degradation, salvage, interconversion and transport of these molecules. In this review, we summarize recent publications that document how pyrimidine metabolism changes under a variety of conditions, including, when possible, those studies based on techniques of genomics, transcriptomics, proteomics, and metabolomics. First, we briefly look at the dynamics of pyrimidine metabolism during nonpathogenic cellular events. We then focus on changes that pathogen infections cause in the pyrimidine metabolism of their host. Next, we discuss the effects of antimetabolites and inhibitors, and finally we consider the consequences of genetic manipulations, such as knock-downs, knock-outs, and knock-ins, of pyrimidine enzymes on pyrimidine metabolism in the cell.
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18
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Imprasittichail W, Roytrakul S, Krungkrai SR, Krungkrail J. A unique insertion of low complexity amino acid sequence underlies protein-protein interaction in human malaria parasite orotate phosphoribosyltransferase and orotidine 5'-monophosphate decarboxylase. ASIAN PAC J TROP MED 2014; 7:184-92. [PMID: 24507637 DOI: 10.1016/s1995-7645(14)60018-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 09/15/2013] [Accepted: 01/15/2014] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE To investigate the multienzyme complex formation of human malaria parasite Plasmodium falciparum (P. falciparum) orotate phosphoribosyltransferase (OPRT) and orotidine 5'-monophosphate decarboxylase (OMPDC), the fifth and sixth enzyme of the de novo pyrimidine biosynthetic pathway. Previously, we have clearly established that the two enzymes in the malaria parasite exist physically as a heterotetrameric (OPRT)2(OMPDC)2 complex containing two subunits each of OPRT and OMPDC, and that the complex have catalytic kinetic advantages over the monofunctional enzyme. METHODS Both enzymes were cloned and expressed as recombinant proteins. The protein-protein interaction in the enzyme complex was identified using bifunctional chemical cross-linker, liquid chromatography-mass spectrometric analysis and homology modeling. RESULTS The unique insertions of low complexity region at the α 2 and α 5 helices of the parasite OMPDC, characterized by single amino acid repeat sequence which was not found in homologous proteins from other organisms, was located on the OPRT-OMPDC interface. The structural models for the protein-protein interaction of the heterotetrameric (OPRT)2(OMPDC)2 multienzyme complex were proposed. CONCLUSIONS Based on the proteomic data and structural modeling, it is surmised that the human malaria parasite low complexity region is responsible for the OPRT-OMPDC interaction. The structural complex of the parasite enzymes, thus, represents an efficient functional kinetic advantage, which in line with co-localization principles of evolutional origin, and allosteric control in protein-protein-interactions.
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Affiliation(s)
- Waranya Imprasittichail
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sittiruk Roytrakul
- National Center for Genetic Engineering and Biotechnology, Pathumthani 12120, Thailand
| | - Sudaratana R Krungkrai
- Unit of Biochemistry, Department of Medical Science, Faculty of Science, Rangsit University, Pathumthani 12000, Thailand
| | - Jerapan Krungkrail
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
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Maguire F, Henriquez FL, Leonard G, Dacks JB, Brown MW, Richards TA. Complex patterns of gene fission in the eukaryotic folate biosynthesis pathway. Genome Biol Evol 2014; 6:2709-20. [PMID: 25252772 PMCID: PMC4224340 DOI: 10.1093/gbe/evu213] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Shared derived genomic characters can be useful for polarizing phylogenetic relationships, for example, gene fusions have been used to identify deep-branching relationships in the eukaryotes. Here, we report the evolutionary analysis of a three-gene fusion of folB, folK, and folP, which encode enzymes that catalyze consecutive steps in de novo folate biosynthesis. The folK-folP fusion was found across the eukaryotes and a sparse collection of prokaryotes. This suggests an ancient derivation with a number of gene losses in the eukaryotes potentially as a consequence of adaptation to heterotrophic lifestyles. In contrast, the folB-folK-folP gene is specific to a mosaic collection of Amorphea taxa (a group encompassing: Amoebozoa, Apusomonadida, Breviatea, and Opisthokonta). Next, we investigated the stability of this character. We identified numerous gene losses and a total of nine gene fission events, either by break up of an open reading frame (four events identified) or loss of a component domain (five events identified). This indicates that this three gene fusion is highly labile. These data are consistent with a growing body of data indicating gene fission events occur at high relative rates. Accounting for these sources of homoplasy, our data suggest that the folB-folK-folP gene fusion was present in the last common ancestor of Amoebozoa and Opisthokonta but absent in the Metazoa including the human genome. Comparative genomic data of these genes provides an important resource for designing therapeutic strategies targeting the de novo folate biosynthesis pathway of a variety of eukaryotic pathogens such as Acanthamoeba castellanii.
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Affiliation(s)
- Finlay Maguire
- Department of Life Sciences, Natural History Museum, London, United Kingdom
| | - Fiona L Henriquez
- Infection and Microbiology Research Group, Institute of Biomedical and Environmental Health Research, School of Science, University of the West of Scotland, Paisley, Renfrewshire, United Kingdom
| | - Guy Leonard
- Biosciences, University of Exeter, Geoffrey Pope Building, Exeter, United Kingdom
| | - Joel B Dacks
- Department of Life Sciences, Natural History Museum, London, United Kingdom Department of Cell Biology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Matthew W Brown
- Department of Biological Sciences, Mississippi State University
| | - Thomas A Richards
- Biosciences, University of Exeter, Geoffrey Pope Building, Exeter, United Kingdom Canadian Institute for Advanced Research, CIFAR Program in Integrated Microbial Biodiversity
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20
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De novo pyrimidine biosynthesis in the oomycete plant pathogen Phytophthora infestans. Gene 2014; 537:312-21. [DOI: 10.1016/j.gene.2013.12.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 11/21/2013] [Accepted: 12/04/2013] [Indexed: 11/21/2022]
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21
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Zhu S, Yan X, Xiang Z, Ding HF, Cui H. Leflunomide reduces proliferation and induces apoptosis in neuroblastoma cells in vitro and in vivo. PLoS One 2013; 8:e71555. [PMID: 23977077 PMCID: PMC3743402 DOI: 10.1371/journal.pone.0071555] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 07/01/2013] [Indexed: 11/30/2022] Open
Abstract
Leflunomide as an immunosuppressive drug is generally used in the treatment of rheumatoid arthritis. It inhibits DHODH (dihydroorotate dehydrogenase ), which is one of the essential enzymes in the de novo pyrimidine biosynthetic pathway. Here we showed that leflunomide significantly reduced cell proliferation and self-renewal activity. Annexin V-FITC/PI staining assay revealed that leflunomide induced S-phase cell cycle arrest, and promoted cell apoptosis. In vivo xenograft study in SCID mice showed that leflunomide inhibited tumor growth and development. We also observed that DHODH was commonly expressed in neuroblastoma. When treated with leflunomide, the neuroblastoma cell lines BE(2)-C, SK-N-DZ, and SK-N-F1 showed dramatic inhibition of DHODH at mRNA and protein levels. Considering the favorable toxicity profile and the successful clinical experience with leflunomide in rheumatoid arthritis, this drug represents a potential new candidate for targeted therapy in neuroblastoma.
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Affiliation(s)
- Shunqin Zhu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- College of Life Science, Southwest University, Chongqing, China
| | - Xiaomin Yan
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Han-Fei Ding
- Cancer Center and Department of Pathology, Georgia Health Sciences University, Augusta, Georgia, United States of America
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- * E-mail:
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Hashimoto M, Enomoto M, Morales J, Kurebayashi N, Sakurai T, Hashimoto T, Nara T, Mikoshiba K. Inositol 1,4,5-trisphosphate receptor regulates replication, differentiation, infectivity and virulence of the parasitic protist Trypanosoma cruzi. Mol Microbiol 2013; 87:1133-50. [PMID: 23320762 DOI: 10.1111/mmi.12155] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/09/2013] [Indexed: 11/26/2022]
Abstract
In animals, inositol 1,4,5-trisphosphate receptors (IP3 Rs) are ion channels that play a pivotal role in many biological processes by mediating Ca(2+) release from the endoplasmic reticulum. Here, we report the identification and characterization of a novel IP3 R in the parasitic protist, Trypanosoma cruzi, the pathogen responsible for Chagas disease. DT40 cells lacking endogenous IP3 R genes expressing T. cruzi IP3 R (TcIP3 R) exhibited IP3 -mediated Ca(2+) release from the ER, and demonstrated receptor binding to IP3 . TcIP3 R was expressed throughout the parasite life cycle but the expression level was much lower in bloodstream trypomastigotes than in intracellular amastigotes or epimastigotes. Disruption of two of the three TcIP3 R gene loci led to the death of the parasite, suggesting that IP3 R is essential for T. cruzi. Parasites expressing reduced or increased levels of TcIP3 R displayed defects in growth, transformation and infectivity, indicating that TcIP3 R is an important regulator of the parasite's life cycle. Furthermore, mice infected with T. cruzi expressing reduced levels of TcIP3 R exhibited a reduction of disease symptoms, indicating that TcIP3 R is an important virulence factor. Combined with the fact that the primary structure of TcIP3 R has low similarity to that of mammalian IP3 Rs, TcIP3 R is a promising drug target for Chagas disease.
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Affiliation(s)
- Muneaki Hashimoto
- Department of Molecular and Cellular Parasitology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan.
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Leonard G, Richards TA. Genome-scale comparative analysis of gene fusions, gene fissions, and the fungal tree of life. Proc Natl Acad Sci U S A 2012; 109:21402-7. [PMID: 23236161 PMCID: PMC3535628 DOI: 10.1073/pnas.1210909110] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During the course of evolution genes undergo both fusion and fission by which ORFs are joined or separated. These processes can amend gene function and represent an important factor in the evolution of protein interaction networks. Gene fusions have been suggested to be useful characters for identifying evolutionary relationships because they constitute synapomorphies or cladistic characters. To investigate the fidelity of gene-fusion characters, we developed an approach for identifying differentially distributed gene fusions among whole-genome datasets: fdfBLAST. Applying this tool to the Fungi, we identified 63 gene fusions present in two or more genomes. Using a combination of phylogenetic and comparative genomic analyses, we then investigated the evolution of these genes across 115 fungal genomes, testing each gene fusion for evidence of homoplasy, including gene fission, convergence, and horizontal gene transfer. These analyses demonstrated 110 gene-fission events. We then identified a minimum of three mechanisms that drive gene fission: separation, degeneration, and duplication. These data suggest that gene fission plays an important and hitherto underestimated role in gene evolution. Gene fusions therefore are highly labile characters, and their use for polarizing evolutionary relationships, without reference to gene and species phylogenies, is limited. Accounting for these considerable sources of homoplasy, we identified fusion characters that provide support for multiple nodes in the phylogeny of the Fungi, including relationships within the deeply derived flagellum-forming fungi (i.e., the chytrids).
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Affiliation(s)
- Guy Leonard
- Life Sciences, The Natural History Museum, London SW7 5BD, United Kingdom; and
| | - Thomas A. Richards
- Life Sciences, The Natural History Museum, London SW7 5BD, United Kingdom; and
- Biosciences, University of Exeter, Exeter EX4 4QD, United Kingdom
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Nara T, Hashimoto M, Hirawake H, Liao CW, Fukai Y, Suzuki S, Tsubouchi A, Morales J, Takamiya S, Fujimura T, Taka H, Mineki R, Fan CK, Inaoka DK, Inoue M, Tanaka A, Harada S, Kita K, Aoki T. Molecular interaction of the first 3 enzymes of the de novo pyrimidine biosynthetic pathway of Trypanosoma cruzi. Biochem Biophys Res Commun 2012; 418:140-3. [DOI: 10.1016/j.bbrc.2011.12.148] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Accepted: 12/29/2011] [Indexed: 01/18/2023]
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Puri V, Goyal A, Sankaranarayanan R, Enright AJ, Vaidya T. Evolutionary and functional insights into Leishmania META1: evidence for lateral gene transfer and a role for META1 in secretion. BMC Evol Biol 2011; 11:334. [PMID: 22093578 PMCID: PMC3270026 DOI: 10.1186/1471-2148-11-334] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 11/17/2011] [Indexed: 12/30/2022] Open
Abstract
Background Leishmania META1 has for long been a candidate molecule for involvement in virulence: META1 transcript and protein are up-regulated in metacyclic Leishmania. Yet, how META1 contributes to virulence remains unclear. We sought insights into the possible functions of META1 by studying its evolutionary origins. Results Using multiple criteria including sequence similarity, nucleotide composition, phylogenetic analysis and selection pressure on gene sequence, we present evidence that META1 originated in trypanosomatids as a result of a lateral gene transfer of a bacterial heat-inducible protein, HslJ. Furthermore, within the Leishmania genome, META1 sequence is under negative selection pressure against change/substitution. Using homology modeling of Leishmania META1 based on solved NMR structure of HslJ, we show that META1 and HslJ share a similar structural fold. The best hit for other proteins with similar fold is MxiM, a protein involved in the type III secretion system in Shigella. The striking structural similarity shared by META1, HslJ and MxiM suggests a possibility of shared functions. Upon structural superposition with MxiM, we have observed a putative hydrophobic cavity in META1. Mutagenesis of select hydrophobic residues in this cavity affects the secretion of the secreted acid phosphatase (SAP), indicating META1's involvement in secretory processes in Leishmania. Conclusions Overall, this work uses an evolutionary biology approach, 3D-modeling and site-directed mutagenesis to arrive at new insights into functions of Leishmania META1.
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Affiliation(s)
- Vidhi Puri
- Centre for Cellular and Molecular Biology, Council for Scientific and Industrial Research, Uppal Road, Hyderabad - 500 007, Andhra Pradesh, India
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Koire AM, Cavalcanti ARO. Fusion of the subunits α and β of succinyl-CoA synthetase as a phylogenetic marker for Pezizomycotina fungi. Genet Mol Biol 2011; 34:669-75. [PMID: 22215972 PMCID: PMC3229123 DOI: 10.1590/s1415-47572011005000040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2011] [Accepted: 06/23/2011] [Indexed: 11/29/2022] Open
Abstract
Gene fusions, yielding the formation of multidomain proteins, are evolutionary events that can be utilized as phylogenetic markers. Here we describe a fusion gene comprising the α and β subunits of succinyl-coA synthetase, an enzyme of the TCA cycle, in Pezizomycotina fungi. This fusion is present in all Pezizomycotina with complete genome sequences and absent from all other organisms. Phylogenetic analysis of the α and β subunits of succinyl-CoA synthetase suggests that both subunits were duplicated and retained in Pezizomycotina while one copy was lost from other fungi. One of the duplicated copies was then fused in Pezizomycotina. Our results suggest that the fusion of the α and β subunits of succinyl-CoA synthetase can be used as a molecular marker for membership in the Pezizomycotina subphylum. If a species has the fusion it can be reliably classified as Pezizomycotina, while the absence of the fusion is suggestive that the species is not a member of this subphylum.
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Opperdoes FR, De Jonckheere JF, Tielens AG. Naegleria gruberi metabolism. Int J Parasitol 2011; 41:915-24. [DOI: 10.1016/j.ijpara.2011.04.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/30/2011] [Accepted: 04/23/2011] [Indexed: 01/08/2023]
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Identification of unique mechanisms for triterpene biosynthesis in Botryococcus braunii. Proc Natl Acad Sci U S A 2011; 108:12260-5. [PMID: 21746901 DOI: 10.1073/pnas.1106222108] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Botryococcene biosynthesis is thought to resemble that of squalene, a metabolite essential for sterol metabolism in all eukaryotes. Squalene arises from an initial condensation of two molecules of farnesyl diphosphate (FPP) to form presqualene diphosphate (PSPP), which then undergoes a reductive rearrangement to form squalene. In principle, botryococcene could arise from an alternative rearrangement of the presqualene intermediate. Because of these proposed similarities, we predicted that a botryococcene synthase would resemble squalene synthase and hence isolated squalene synthase-like genes from Botryococcus braunii race B. While B. braunii does harbor at least one typical squalene synthase, none of the other three squalene synthase-like (SSL) genes encodes for botryococcene biosynthesis directly. SSL-1 catalyzes the biosynthesis of PSPP and SSL-2 the biosynthesis of bisfarnesyl ether, while SSL-3 does not appear able to directly utilize FPP as a substrate. However, when combinations of the synthase-like enzymes were mixed together, in vivo and in vitro, robust botryococcene (SSL-1+SSL-3) or squalene biosynthesis (SSL1+SSL-2) was observed. These findings were unexpected because squalene synthase, an ancient and likely progenitor to the other Botryococcus triterpene synthases, catalyzes a two-step reaction within a single enzyme unit without intermediate release, yet in B. braunii, these activities appear to have separated and evolved interdependently for specialized triterpene oil production greater than 500 MYA. Coexpression of the SSL-1 and SSL-3 genes in different configurations, as independent genes, as gene fusions, or targeted to intracellular membranes, also demonstrate the potential for engineering even greater efficiencies of botryococcene biosynthesis.
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Mollá-Morales A, Sarmiento-Mañús R, Robles P, Quesada V, Pérez-Pérez JM, González-Bayón R, Hannah MA, Willmitzer L, Ponce MR, Micol JL. Analysis of ven3 and ven6 reticulate mutants reveals the importance of arginine biosynthesis in Arabidopsis leaf development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2011; 65:335-45. [PMID: 21265888 DOI: 10.1111/j.1365-313x.2010.04425.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Arabidopsis thaliana reticulate mutants exhibit differential pigmentation of the veinal and interveinal leaf regions, a visible phenotype that often indicates impaired mesophyll development. We performed a metabolomic analysis of one ven6 (venosa6) and three ven3 reticulate mutants that revealed altered levels of arginine precursors, namely increased ornithine and reduced citrulline levels. In addition, the mutants were more sensitive than the wild-type to exogenous ornithine, and leaf reticulation and mesophyll defects of these mutants were completely rescued by exogenous citrulline. Taken together, these results indicate that ven3 and ven6 mutants experience a blockage of the conversion of ornithine into citrulline in the arginine pathway. Consistent with the participation of VEN3 and VEN6 in the same pathway, the morphological phenotype of ven3 ven6 double mutants was synergistic. Map-based cloning showed that the VEN3 and VEN6 genes encode subunits of Arabidopsis carbamoyl phosphate synthetase (CPS), which is assumed to be required for the conversion of ornithine into citrulline in arginine biosynthesis. Heterologous expression of the Arabidopsis VEN3 and VEN6 genes in a CPS-deficient Escherichia coli strain fully restored bacterial growth in minimal medium, demonstrating the enzymatic activity of the VEN3 and VEN6 proteins, and indicating a conserved role for CPS in these distinct and distant species. Detailed study of the reticulate leaf phenotype in the ven3 and ven6 mutants revealed that mesophyll development is highly sensitive to impaired arginine biosynthesis.
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Affiliation(s)
- Almudena Mollá-Morales
- Instituto de Bioingeniería, Universidad Miguel Hernández, Campus de Elche, E-03202 Elche, Spain
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Kinetic mechanism and catalysis of Trypanosoma cruzi dihydroorotate dehydrogenase enzyme evaluated by isothermal titration calorimetry. Anal Biochem 2010; 399:13-22. [DOI: 10.1016/j.ab.2009.11.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 11/14/2009] [Accepted: 11/15/2009] [Indexed: 11/20/2022]
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Salim HMW, Negritto MC, Cavalcanti ARO. 1+1 = 3: a fusion of 2 enzymes in the methionine salvage pathway of Tetrahymena thermophila creates a trifunctional enzyme that catalyzes 3 steps in the pathway. PLoS Genet 2009; 5:e1000701. [PMID: 19851454 PMCID: PMC2759508 DOI: 10.1371/journal.pgen.1000701] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Accepted: 09/23/2009] [Indexed: 12/16/2022] Open
Abstract
The methionine salvage pathway is responsible for regenerating methionine from its derivative, methylthioadenosine. The complete set of enzymes of the methionine pathway has been previously described in bacteria. Despite its importance, the pathway has only been fully described in one eukaryotic organism, yeast. Here we use a computational approach to identify the enzymes of the methionine salvage pathway in another eukaryote, Tetrahymena thermophila. In this organism, the pathway has two fused genes, MTNAK and MTNBD. Each of these fusions involves two different genes whose products catalyze two different single steps of the pathway in other organisms. One of the fusion proteins, mtnBD, is formed by enzymes that catalyze non-consecutive steps in the pathway, mtnB and mtnD. Interestingly the gene that codes for the intervening enzyme in the pathway, mtnC, is missing from the genome of Tetrahymena. We used complementation tests in yeast to show that the fusion of mtnB and mtnD from Tetrahymena is able to do in one step what yeast does in three, since it can rescue yeast knockouts of mtnB, mtnC, or mtnD. Fusion genes have proved to be very useful in aiding phylogenetic reconstructions and in the functional characterization of genes. Our results highlight another characteristic of fusion proteins, namely that these proteins can serve as biochemical shortcuts, allowing organisms to completely bypass steps in biochemical pathways. Fusion genes, composed of the complete sequence of two or more other genes, are excellent markers of evolution. In addition, fused genes are usually composed of genes with related functions, which makes them useful in inferring function when the function of one of their components is known. We detected a fusion gene in the eukaryotic organism Tetrahymena thermophila that, although composed of only two genes, seems to perform the function of three genes in this organism. To show that this is the case, we expressed the Tetrahymena fused gene in three different yeast strains, each lacking one of these three genes. The Tetrahymena gene was able to rescue the phenotype of all yeast strains, proving that it can perform the functions of the three genes in yeast. Our results highlight another important biochemical characteristic of fusion genes: they can serve as biological shortcuts, allowing a single fusion of two enzymes to functionally replace three independent enzymes.
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Affiliation(s)
- Hannah M. W. Salim
- Biology Department, Pomona College, Claremont, California, United States of America
| | | | - Andre R. O. Cavalcanti
- Biology Department, Pomona College, Claremont, California, United States of America
- * E-mail:
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Kanchanaphum P, Krungkrai J. Kinetic benefits and thermal stability of orotate phosphoribosyltransferase and orotidine 5'-monophosphate decarboxylase enzyme complex in human malaria parasite Plasmodium falciparum. Biochem Biophys Res Commun 2009; 390:337-41. [PMID: 19800871 DOI: 10.1016/j.bbrc.2009.09.128] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 09/30/2009] [Indexed: 11/24/2022]
Abstract
We have previously shown that orotate phosphoribosyltransferase (OPRT) and orotidine 5'-monophosphate decarboxylase (OMPDC) in human malaria parasite Plasmodium falciparum form an enzyme complex, containing two subunits each of OPRT and OMPDC. To enable further characterization, we expressed and purified P. falciparum OPRT-OMPDC enzyme complex in Escherichia coli. The OPRT and OMPDC activities of the enzyme complex co-eluted in the chromatographic columns used during purification. Kinetic parameters (K(m), k(cat) and k(cat)/K(m)) of the enzyme complex were 5- to 125-folds higher compared to the monofunctional enzyme. Interestingly, pyrophosphate was a potent inhibitor to the enzyme complex, but had a slightly inhibitory effect for the monofunctional enzyme. The enzyme complex resisted thermal inactivation at higher temperature than the monofunctional OPRT and OMPDC. The result suggests that the OPRT-OMPDC enzyme complex might have kinetic benefits and thermal stability significantly different from the monofunctional enzyme.
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Affiliation(s)
- Panan Kanchanaphum
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
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Kim S, Park DH, Kim TH, Hwang M, Shim J. Functional analysis of pyrimidine biosynthesis enzymes using the anticancer drug 5-fluorouracil in Caenorhabditis elegans. FEBS J 2009; 276:4715-26. [PMID: 19645718 DOI: 10.1111/j.1742-4658.2009.07168.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pyrimidine biosynthesis enzymes function in many cellular processes and are closely associated with pyrimidine antagonists used in cancer chemotherapy. These enzymes are well characterized from bacteria to mammals, but not in a simple metazoan. To study the pyrimidine biosynthesis pathway in Caenorhabditis elegans, we screened for mutants exhibiting resistance to the anticancer drug 5-fluorouracil (5-FU). In several strains, mutations were identified in ZK783.2, the worm homolog of human uridine phosphorylase (UP). UP is a member of the pyrimidine biosynthesis family of enzymes and is a key regulator of uridine homeostasis. C. elegans UP homologous protein (UPP-1) exhibited both uridine and thymidine phosphorylase activity in vitro. Knockdown of other pyrimidine biosynthesis enzyme homologs, such as uridine monophosphate kinase and uridine monophosphate synthetase, also resulted in 5-FU resistance. Uridine monophosphate kinase and uridine monophosphate synthetase proteins are redundant, and show different, tissue-specific expression patterns in C. elegans. Whereas pyrimidine biosynthesis pathways are highly conserved between worms and humans, no human thymidine phosphorylase homolog has been identified in C. elegans. UPP-1 functions as a key regulator of the pyrimidine salvage pathway in C. elegans, as mutation of upp-1 results in strong 5-FU resistance.
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Affiliation(s)
- Seongseop Kim
- Cancer Experimental Resources Branch, National Cancer Center, Gyeonggi-do, Korea
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Patel V, Booker M, Kramer M, Ross L, Celatka CA, Kennedy LM, Dvorin JD, Duraisingh MT, Sliz P, Wirth DF, Clardy J. Identification and characterization of small molecule inhibitors of Plasmodium falciparum dihydroorotate dehydrogenase. J Biol Chem 2008; 283:35078-85. [PMID: 18842591 PMCID: PMC2596402 DOI: 10.1074/jbc.m804990200] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Revised: 10/06/2008] [Indexed: 11/06/2022] Open
Abstract
Plasmodium falciparum causes the most deadly form of malaria and accounts for over one million deaths annually. The malaria parasite is unable to salvage pyrimidines and relies on de novo biosynthesis for survival. Dihydroorotate dehydrogenase (DHOD), a mitochondrially localized flavoenzyme, catalyzes the rate-limiting step of this pathway and is therefore an attractive antimalarial chemotherapeutic target. Using a target-based high throughput screen, we have identified a series of potent, species-specific inhibitors of P. falciparum DHOD (pfDHOD) that are also efficacious against three cultured strains (3D7, HB3, and Dd2) of P. falciparum. The primary antimalarial mechanism of action of these compounds was confirmed to be inhibition of pfDHOD through a secondary assay with transgenic malaria parasites, and the structural basis for enzyme inhibition was explored through in silico structure-based docking and site-directed mutagenesis. Compound-mediated cytotoxicity was not observed with human dermal fibroblasts or renal epithelial cells. These data validate pfDHOD as an antimalarial drug target and provide chemical scaffolds with which to begin medicinal chemistry efforts.
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Affiliation(s)
- Vishal Patel
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Michael Booker
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Martin Kramer
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Leila Ross
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Cassandra A. Celatka
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Leah M. Kennedy
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Jeffrey D. Dvorin
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Manoj T. Duraisingh
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Piotr Sliz
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Dyann F. Wirth
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
| | - Jon Clardy
- Department of Biological
Chemistry and Molecular Pharmacology, Harvard Medical School, Boston,
Massachusetts 02115, the Department
of Immunology and Infectious Disease, Harvard School of Public Health, Boston,
Massachusetts 02115, Drug and
Biomaterial Research and Development, Genzyme Corporation, Waltham,
Massachusetts 02451, Division of
Infectious Diseases, Children's Hospital Boston, Boston, Massachusetts 02115,
and the Department of Pediatrics, Harvard
Medical School, Boston, Massachusetts 02115
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Inaoka DK, Sakamoto K, Shimizu H, Shiba T, Kurisu G, Nara T, Aoki T, Kita K, Harada S. Structures of Trypanosoma cruzi Dihydroorotate Dehydrogenase Complexed with Substrates and Products: Atomic Resolution Insights into Mechanisms of Dihydroorotate Oxidation and Fumarate Reduction. Biochemistry 2008; 47:10881-91. [DOI: 10.1021/bi800413r] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Ken Inaoka
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Kimitoshi Sakamoto
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Hironari Shimizu
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Tomoo Shiba
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Genji Kurisu
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Takeshi Nara
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Takashi Aoki
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Kiyoshi Kita
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - Shigeharu Harada
- Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan, Department of Molecular and Cellular Parasitology, Juntendo University, Tokyo 113-8421, Japan, and Department of Applied Biology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
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Brinkmann H, Philippe H. The Diversity Of Eukaryotes And The Root Of The Eukaryotic Tree. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 607:20-37. [DOI: 10.1007/978-0-387-74021-8_2] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Lopes MS, Araus JL. Comparative genomic and physiological analysis of nutrient response to NH4+, NH4+:NO3- and NO3- in barley seedlings. PHYSIOLOGIA PLANTARUM 2008; 134:134-50. [PMID: 18544123 DOI: 10.1111/j.1399-3054.2008.01114.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Long-term differences in photosynthesis, respiration and growth of plants receiving distinct nitrogen (N) sources imply that N metabolism generates signals that regulate metabolism and development. The molecular basis of these signals remains unclear. Here we studied the gene expression profiles of barley (Hordeum vulgare L. cv. Graphic) seedlings fertilized either with ammonium (NH4+), with ammonium and nitrate (NH4+:NO3-), or with nitrate (NO3-) only. Our transcriptome analysis after 48 h of growth in these N sources showed major changes in the expression of genes involved in N metabolism (nitrate reductase), signalling (protein kinases and protein phosphatases), photosynthesis (chlorophyll a/b-binding protein and a PsbQ domain), where increases in NO3- as compared with NH4+ were observed. Moreover, NH4+ assimilation induced genes participating in C and sugars metabolism (phosphoglycerate kinase, glucosyltranferase and galactokinase), respiration (cytochrome c oxidase), protein fate (heat shock proteins) and development (MTN3-like protein). These changes in gene expression could well explain the long-term growth depression observed in NH4+ plants. Even if a few genes participating in protein fate (proteases) and development (OsNAC5) were upregulated in NH4+ as compared with NH4+:NO3-, the general pattern of expression was quite similar between these two N sources. Taken together, these results indicated that other downstream mechanisms should be involved in the synergetic long-term response of NH4+:NO3-.
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Affiliation(s)
- Marta S Lopes
- Facultat de Biologia, Unitat de Fisiologia Vegetal, Universitat de Barcelona, Barcelona, Spain
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39
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Samant S, Lee H, Ghassemi M, Chen J, Cook JL, Mankin AS, Neyfakh AA. Nucleotide biosynthesis is critical for growth of bacteria in human blood. PLoS Pathog 2008; 4:e37. [PMID: 18282099 PMCID: PMC2242838 DOI: 10.1371/journal.ppat.0040037] [Citation(s) in RCA: 183] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Accepted: 01/07/2008] [Indexed: 01/23/2023] Open
Abstract
Proliferation of bacterial pathogens in blood represents one of the most dangerous stages of infection. Growth in blood serum depends on the ability of a pathogen to adjust metabolism to match the availability of nutrients. Although certain nutrients are scarce in blood and need to be de novo synthesized by proliferating bacteria, it is unclear which metabolic pathways are critical for bacterial growth in blood. In this study, we identified metabolic functions that are essential specifically for bacterial growth in the bloodstream. We used two principally different but complementing techniques to comprehensively identify genes that are required for the growth of Escherichia coli in human serum. A microarray-based and a dye-based mutant screening approach were independently used to screen a library of 3,985 single-gene deletion mutants in all non-essential genes of E. coli (Keio collection). A majority of the mutants identified consistently by both approaches carried a deletion of a gene involved in either the purine or pyrimidine nucleotide biosynthetic pathway and showed a 20- to 1,000-fold drop in viable cell counts as compared to wild-type E. coli after 24 h of growth in human serum. This suggests that the scarcity of nucleotide precursors, but not other nutrients, is the key limitation for bacterial growth in serum. Inactivation of nucleotide biosynthesis genes in another Gram-negative pathogen, Salmonella enterica, and in the Gram-positive pathogen Bacillus anthracis, prevented their growth in human serum. The growth of the mutants could be rescued by genetic complementation or by addition of appropriate nucleotide bases to human serum. Furthermore, the virulence of the B. anthracis purE mutant, defective in purine biosynthesis, was dramatically attenuated in a murine model of bacteremia. Our data indicate that de novo nucleotide biosynthesis represents the single most critical metabolic function for bacterial growth in blood and reveal the corresponding enzymes as putative antibiotic targets for the treatment of bloodstream infections. Bacterial growth in the bloodstream is a common manifestation of a number of bacterial infections. When growing in blood, bacteria not only have to evade the host's immune response, but also adjust their metabolism to suit availability of nutrients. Although the concentrations of various metabolites in human blood are known, it is difficult to predict which nutrients are abundant and which are scarce. To proliferate in human blood, bacteria need to synthesize metabolites that are present in the limiting concentrations. For that, they need to produce specific enzymes that are, thus, critical for the bacterial growth in the bloodstream. We carried out a comprehensive, genome-wide search for Escherichia coli genes that are essential for growth in human serum. We found that inactivation of nucleotide biosynthesis genes leads to a significant growth defect in human serum not only for E. coli but also for two other pathogens, Salmonella Typhimurium and Bacillus anthracis. The results of this study demonstrate that the limiting amounts of the nucleotide bases in human serum force invading pathogens to rely on de novo nucleotide biosynthesis. Hence, our findings reveal nucleotide biosynthesis enzymes as a possible target for the treatment of bloodstream infections.
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Affiliation(s)
- Shalaka Samant
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Hyunwoo Lee
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Mahmood Ghassemi
- Section of Infectious Diseases, Immunology and Internal Medicine, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Juan Chen
- Section of Infectious Diseases, Immunology and Internal Medicine, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - James L Cook
- Section of Infectious Diseases, Immunology and Internal Medicine, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Alexander S Mankin
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, Illinois, United States of America
- * To whom correspondence should be addressed. E-mail:
| | - Alexander A Neyfakh
- Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, Chicago, Illinois, United States of America
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40
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Gross J, Meurer J, Bhattacharya D. Evidence of a chimeric genome in the cyanobacterial ancestor of plastids. BMC Evol Biol 2008; 8:117. [PMID: 18433492 PMCID: PMC2412073 DOI: 10.1186/1471-2148-8-117] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Accepted: 04/23/2008] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Horizontal gene transfer (HGT) is a vexing fact of life for microbial phylogeneticists. Given the substantial rates of HGT observed in modern-day bacterial chromosomes, it is envisaged that ancient prokaryotic genomes must have been similarly chimeric. But where can one find an ancient prokaryotic genome that has maintained its ancestral condition to address this issue? An excellent candidate is the cyanobacterial endosymbiont that was harnessed over a billion years ago by a heterotrophic protist, giving rise to the plastid. Genetic remnants of the endosymbiont are still preserved in plastids as a highly reduced chromosome encoding 54 - 264 genes. These data provide an ideal target to assess genome chimericism in an ancient cyanobacterial lineage. RESULTS Here we demonstrate that the origin of the plastid-encoded gene cluster for menaquinone/phylloquinone biosynthesis in the extremophilic red algae Cyanidiales contradicts a cyanobacterial genealogy. These genes are relics of an ancestral cluster related to homologs in Chlorobi/Gammaproteobacteria that we hypothesize was established by HGT in the progenitor of plastids, thus providing a 'footprint' of genome chimericism in ancient cyanobacteria. In addition to menB, four components of the original gene cluster (menF, menD, menC, and menH) are now encoded in the nuclear genome of the majority of non-Cyanidiales algae and plants as the unique tetra-gene fusion named PHYLLO. These genes are monophyletic in Plantae and chromalveolates, indicating that loci introduced by HGT into the ancestral cyanobacterium were moved over time into the host nucleus. CONCLUSION Our study provides unambiguous evidence for the existence of genome chimericism in ancient cyanobacteria. In addition we show genes that originated via HGT in the cyanobacterial ancestor of the plastid made their way to the host nucleus via endosymbiotic gene transfer (EGT).
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Affiliation(s)
- Jeferson Gross
- University of Iowa, Department of Biological Sciences and the Roy J. Carver Center for Comparative Genomics, 446 Biology Building, Iowa City, Iowa 52242, USA
| | - Jörg Meurer
- Department Biology I, Botany, Ludwig-Maximilians-University Munich, Menzinger Str. 67, 80638 Munich, Germany
| | - Debashish Bhattacharya
- University of Iowa, Department of Biological Sciences and the Roy J. Carver Center for Comparative Genomics, 446 Biology Building, Iowa City, Iowa 52242, USA
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Makiuchi T, Annoura T, Hashimoto T, Murata E, Aoki T, Nara T. Evolutionary analysis of synteny and gene fusion for pyrimidine biosynthetic enzymes in Euglenozoa: an extraordinary gap between kinetoplastids and diplonemids. Protist 2008; 159:459-70. [PMID: 18394957 DOI: 10.1016/j.protis.2008.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Accepted: 02/03/2008] [Indexed: 11/16/2022]
Abstract
A unique feature of the genome architecture in the parasitic trypanosomatid protists is large-scale synteny. We addressed the evolutionary trait of synteny in the eukaryotic group, Euglenozoa, which consists of euglenoids (earliest branching), diplonemids, and kinetoplastids (trypanosomatids and bodonids). Synteny of the pyrimidine biosynthetic (pyr) gene cluster, which constitutes part of a large syntenic cluster in trypanosomatids and includes four separate genes (pyr1-pyr4) and one fused gene (pyr6/pyr5 fusion), was conserved in the bodonid, Parabodo caudatus. In the diplonemid, Diplonema papillatum, we identified pyr4 and pyr6 genes. Phylogenetic analyses of pyr4 and pyr6 showed the separate origin of each in kinetoplastids and euglenoids/diplonemids and suggested that kinetoplastids have acquired these genes via lateral gene transfer (LGT). Because replacement of genes by non-orthologs within the syntenic cluster is highly unlikely, we concluded that, after separation of the line leading to diplonemids, the syntenic pyr gene cluster was established in the common ancestor of kinetoplastids, preceded by their acquisition via LGT. Notably, we found that diplonemid pyr6 is a stand-alone gene, inconsistent with both euglenoid pyr5/pyr6 and kinetoplastid pyr6/pyr5 fusions. Our findings provide insights into the evolutionary gaps within Euglenozoa and the evolutionary trait of rearrangement of gene fusion in this lineage.
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Affiliation(s)
- Takashi Makiuchi
- Department of Molecular and Cellular Parasitology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
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Arakaki TL, Buckner FS, Gillespie JR, Malmquist NA, Phillips MA, Kalyuzhniy O, Luft JR, Detitta GT, Verlinde CLMJ, Van Voorhis WC, Hol WGJ, Merritt EA. Characterization of Trypanosoma brucei dihydroorotate dehydrogenase as a possible drug target; structural, kinetic and RNAi studies. Mol Microbiol 2008; 68:37-50. [PMID: 18312275 DOI: 10.1111/j.1365-2958.2008.06131.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Nucleotide biosynthesis pathways have been reported to be essential in some protozoan pathogens. Hence, we evaluated the essentiality of one enzyme in the pyrimidine biosynthetic pathway, dihydroorotate dehydrogenase (DHODH) from the eukaryotic parasite Trypanosoma brucei through gene knockdown studies. RNAi knockdown of DHODH expression in bloodstream form T. brucei did not inhibit growth in normal medium, but profoundly retarded growth in pyrimidine-depleted media or in the presence of the known pyrimidine uptake antagonist 5-fluorouracil (5-FU). These results have significant implications for the development of therapeutics to combat T. brucei infection. Specifically, a combination therapy including a T. brucei-specific DHODH inhibitor plus 5-FU may prove to be an effective therapeutic strategy. We also show that this trypanosomal enzyme is inhibited by known inhibitors of bacterial Class 1A DHODH, in distinction to the sensitivity of DHODH from human and other higher eukaryotes. This selectivity is supported by the crystal structure of the T. brucei enzyme, which is reported here at a resolution of 1.95 A. Additional research, guided by the crystal structure described herein, is needed to identify potent inhibitors of T. brucei DHODH.
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Affiliation(s)
- Tracy L Arakaki
- Department of Biochemistry, University of Washington, Seattle, WA 98195, USA
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Dihydroorotase of human malarial parasite Plasmodium falciparum differs from host enzyme. Biochem Biophys Res Commun 2008; 366:821-6. [DOI: 10.1016/j.bbrc.2007.12.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2007] [Accepted: 12/05/2007] [Indexed: 10/22/2022]
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Malmquist NA, Gujjar R, Rathod PK, Phillips MA. Analysis of flavin oxidation and electron-transfer inhibition in Plasmodium falciparum dihydroorotate dehydrogenase. Biochemistry 2008; 47:2466-75. [PMID: 18225919 DOI: 10.1021/bi702218c] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Plasmodium falciparum dihydroorotate dehydrogenase (pfDHODH) is a flavin-dependent mitochondrial enzyme that provides the only route to pyrimidine biosynthesis in the parasite. Clinically significant inhibitors of human DHODH (e.g., A77 1726) bind to a pocket on the opposite face of the flavin cofactor from dihydroorotate (DHO). This pocket demonstrates considerable sequence variability, which has allowed species-specific inhibitors of the malarial enzyme to be identified. Ubiquinone (CoQ), the physiological oxidant in the reaction, has been postulated to bind this site despite a lack of structural evidence. To more clearly define the residues involved in CoQ binding and catalysis, we undertook site-directed mutagenesis of seven residues in the structurally defined A77 1726 binding site, which we term the species-selective inhibitor site. Mutation of several of these residues (H185, F188, and F227) to Ala substantially decreased the affinity of pfDHODH-specific inhibitors (40-240-fold). In contrast, only a modest increase in the Kmapp for CoQ was observed, although mutation of Y528 in particular caused a substantial reduction in kcat (40-100-fold decrease). Pre-steady-state kinetic analysis by single wavelength stopped-flow spectroscopy showed that the mutations had no effect on the rate of the DHO-dependent reductive half-reaction, but most reduced the rate of the CoQ-dependent flavin oxidation step (3-20-fold decrease), while not significantly altering the Kdox for CoQ. As with the mutants, inhibitors that bind this site block the CoQ-dependent oxidative half-reaction without affecting the DHO-dependent step. These results identify residues involved in inhibitor binding and electron transfer to CoQ. Importantly, the data provide compelling evidence that the binding sites for CoQ and species-selective site inhibitors do not overlap, and they suggest instead that inhibitors act either by blocking the electron path between flavin and CoQ or by stabilizing a conformation that excludes CoQ binding.
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Affiliation(s)
- Nicholas A Malmquist
- Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, 6001 Forest Park Boulevard, Dallas, Texas 75390-9041, USA
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45
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Opperdoes FR, Michels PAM. Horizontal gene transfer in trypanosomatids. Trends Parasitol 2007; 23:470-6. [PMID: 17826337 DOI: 10.1016/j.pt.2007.08.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2005] [Revised: 06/27/2007] [Accepted: 08/23/2007] [Indexed: 11/21/2022]
Abstract
Trypanosomes harbour a large number of structural and biochemical peculiarities. Kinetoplast DNA, mitochondrial RNA editing, the sequestration of glycolysis inside glycosomes and unique oxidative-stress protection mechanisms (to name but a few) are found only in the members of the order Kinetoplastida. Thus, it is not surprising that they have provoked much speculation about why and how such oddities have evolved in trypanosomes. However, the true reasons for their existence within the eukaryotic world are still far from clear. Here, Fred Opperdoes and Paul Michels argue that the trypanosome-specific evolution of novel processes and organization could only have been made possible by the acquisition of a large number of foreign genes, which entered a trypanosomatid ancestor through lateral gene transfer. Many different organisms must have served as donors. Some of them were viruses, and others were bacteria, such as cyanobacterial endosymbionts and non-phototrophic bacteria.
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Affiliation(s)
- Fred R Opperdoes
- Research Unit for Tropical Diseases, Christian de Duve Institute of Cellular Pathology and Laboratory of Biochemistry, Université catholique de Louvain, Avenue Hippocrate 74-75, B-1200 Brussels, Belgium.
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Annoura T, Sariego I, Nara T, Makiuchi T, Fujimura T, Taka H, Mineki R, Murayama K, Aoki T. Dihydroorotate dehydrogenase arises from novel fused gene product with aspartate carbamoyltransferase in Bodo saliens. Biochem Biophys Res Commun 2007; 358:253-8. [PMID: 17475213 DOI: 10.1016/j.bbrc.2007.04.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2007] [Accepted: 04/17/2007] [Indexed: 11/22/2022]
Abstract
The ACT-DHOD gene in the kinetoplastid Bodo saliens encodes aspartate carbamoyltransferase and dihydroorotate dehydrogenase, the second and fourth enzymes of pyrimidine biosynthesis. Although the single mRNA species yielded a 70-kDa ACT-DHOD protein, Western blotting with anti-DHOD-peptide antibody showed a major band of 35-kDa and minor bands. In-gel digestion and liquid chromatography-tandem mass (MS/MS) spectrometry showed that the 35-kDa band contained DHOD-specific polypeptides and an ACT-specific polypeptide, suggesting the occurrence of independent DHOD and ACT. Immunoprecipitation and MS/MS analysis identified a 70-kDa ACT-DHOD and a 35-kDa DHOD independently, and the N-terminal amino acid of 35-kDa DHOD was blocked. In vitro processing assay showed that recombinant ACT-DHOD was decreased by the B. saliens lysate, accompanying the appearance of 35-kDa DHOD and 35-kDa ACT. These results indicate that fused ACT-DHOD is the precursor to mature DHOD. Large amount of 35-kDa DHOD in B. saliens is discussed from a viewpoint of its physiological roles.
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Affiliation(s)
- Takeshi Annoura
- Department of Molecular and Cellular Parasitology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
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Zameitat E, Freymark G, Dietz CD, Löffler M, Bölker M. Functional expression of human dihydroorotate dehydrogenase (DHODH) in pyr4 mutants of ustilago maydis allows target validation of DHODH inhibitors in vivo. Appl Environ Microbiol 2007; 73:3371-9. [PMID: 17369345 PMCID: PMC1907109 DOI: 10.1128/aem.02569-06] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Dihydroorotate dehydrogenase (DHODH; EC 1.3.99.11) is a central enzyme of pyrimidine biosynthesis and catalyzes the oxidation of dihydroorotate to orotate. DHODH is an important target for antiparasitic and cytostatic drugs since rapid cell proliferation often depends on the de novo synthesis of pyrimidine nucleotides. We have cloned the pyr4 gene encoding mitochondrial DHODH from the basidiomycetous plant pathogen Ustilago maydis. We were able to show that pyr4 contains a functional mitochondrial targeting signal. The deletion of pyr4 resulted in uracil auxotrophy, enhanced sensitivity to UV irradiation, and a loss of pathogenicity on corn plants. The biochemical characterization of purified U. maydis DHODH overproduced in Escherichia coli revealed that the U. maydis enzyme uses quinone electron acceptor Q6 and is resistant to several commonly used DHODH inhibitors. Here we show that the expression of the human DHODH gene fused to the U. maydis mitochondrial targeting signal is able to complement the auxotrophic phenotype of pyr4 mutants. While U. maydis wild-type cells were resistant to the DHODH inhibitor brequinar, strains expressing the human DHODH gene became sensitive to this cytostatic drug. Such engineered U. maydis strains can be used in sensitive in vivo assays for the development of novel drugs specifically targeted at either human or fungal DHODH.
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Affiliation(s)
- Elke Zameitat
- Faculty of Medicine, Department of Biology, Philipps University Marburg, Karl-von-Frisch-Str. 8, D-35032 Marburg, Germany
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48
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Malmquist NA, Baldwin J, Phillips MA. Detergent-dependent kinetics of truncated Plasmodium falciparum dihydroorotate dehydrogenase. J Biol Chem 2007; 282:12678-86. [PMID: 17329250 DOI: 10.1074/jbc.m609893200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The survival of the malaria parasite Plasmodium falciparum is dependent upon the de novo biosynthesis of pyrimidines. P. falciparum dihydroorotate dehydrogenase (PfDHODH) catalyzes the fourth step in this pathway in an FMN-dependent reaction. The full-length enzyme is associated with the inner mitochondrial membrane, where ubiquinone (CoQ) serves as the terminal electron acceptor. The lipophilic nature of the co-substrate suggests that electron transfer to CoQ occurs at the two-dimensional lipid-solution interface. Here we show that PfDHODH associates with liposomes even in the absence of the N-terminal transmembrane-spanning domain. The association of a series of ubiquinone substrates with detergent micelles was studied by isothermal titration calorimetry, and the data reveal that CoQ analogs with long decyl (CoQ(D)) or geranyl (CoQ(2)) tails partition into detergent micelles, whereas that with a short prenyl tail (CoQ(1)) remains in solution. PfDHODH-catalyzed reduction of CoQ(D) and CoQ(2), but not CoQ(1), is stimulated as detergent concentrations (Tween 80 or Triton X-100) are increased up to their critical micelle concentrations, beyond which activity declines. Steady-state kinetic data acquired for the reaction with CoQ(D) and CoQ(2) in substrate-detergent mixed micelles fit well to a surface dilution kinetic model. In contrast, the data for CoQ(1) as a substrate were well described by solution steady-state kinetics. Our results suggest that the partitioning of lipophilic ubiquinone analogues into detergent micelles needs to be an important consideration in the kinetic analysis of enzymes that utilize these substrates.
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Affiliation(s)
- Nicholas A Malmquist
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9041, USA
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Makiuchi T, Nara T, Annoura T, Hashimoto T, Aoki T. Occurrence of multiple, independent gene fusion events for the fifth and sixth enzymes of pyrimidine biosynthesis in different eukaryotic groups. Gene 2007; 394:78-86. [PMID: 17383832 DOI: 10.1016/j.gene.2007.02.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2006] [Revised: 02/13/2007] [Accepted: 02/13/2007] [Indexed: 02/06/2023]
Abstract
The genes encoding orotate phosphoribosyltransferase (OPRT) and orotidine-5'-monophosphate decarboxylase (OMPDC), the fifth and sixth enzymes in the de novo pyrimidine biosynthetic pathway, are fused as OPRT-OMPDC in most eukaryotic groups. On the other hand, the inversely linked OMPDC-OPRT fusion is present in trypanosomatids, belonging to kinetoplastids together with bodonids in a supergroup, Euglenozoa. Here, we show the presence of OMPDC-OPRT in the bodonid, Bodo caudatus, while OPRT-OMPDC in Euglena gracilis, another euglenozoan species belonging to euglenoids. These results suggest that the OMPDC-OPRT fusion event occurred in a common ancestor of kinetoplastids. Genome sequence database searches further revealed the presence of OMPDC-OPRT in stramenopiles and cyanobacteria. Phylogenetic reconstruction of OPRT and OMPDC rejected statistically the monophyly of the OPRT domains of stramenopile and kinetoplastid OMPDC-OPRT, demonstrating that these gene fusions do not share a common evolutionary origin, despite the identical gene order. Thus, the OMPDC-OPRT fusion is likely to have emerged independently in these eukaryotic groups. Phylogenetic analyses also suggested that cyanobacterial OMPDC-OPRT arose via lateral transfer. We conclude that gene fusion events occur more frequently than previously thought and that lateral gene transfer has made a marked contribution to establishment of the rearranged structure of OPRT and OMPDC genes in eukaryotes.
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Affiliation(s)
- Takashi Makiuchi
- Department of Molecular and Cellular Parasitology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
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Forgue P, Halouska S, Werth M, Xu K, Harris S, Powers R. NMR metabolic profiling of Aspergillus nidulans to monitor drug and protein activity. J Proteome Res 2007; 5:1916-23. [PMID: 16889413 DOI: 10.1021/pr060114v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We describe a general protocol for using comparative NMR metabolomics data to infer in vivo efficacy, specificity and toxicity of chemical leads within a drug discovery program. The methodology is demonstrated using Aspergillus nidulans to monitor the activity of urate oxidase and orotidine-5'-phosphate decarboxylase and the impact of 8-azaxanthine, an inhibitor of urate oxidase. 8-azaxanthine is shown to inhibit A. nidulans hyphal growth by in vivo inactivation of urate oxidase.
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Affiliation(s)
- Paxton Forgue
- Department of Chemistry and Plant Pathology, University of Nebraska-Lincoln, 68588, USA
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