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Faist H, Ankenbrand MJ, Sickel W, Hentschel U, Keller A, Deeken R. Opportunistic Bacteria of Grapevine Crown Galls Are Equipped with the Genomic Repertoire for Opine Utilization. Genome Biol Evol 2023; 15:evad228. [PMID: 38085065 PMCID: PMC10745273 DOI: 10.1093/gbe/evad228] [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] [Accepted: 12/06/2023] [Indexed: 12/24/2023] Open
Abstract
Young grapevines (Vitis vinifera) suffer and eventually can die from the crown gall disease caused by the plant pathogen Allorhizobium vitis (Rhizobiaceae). Virulent members of A. vitis harbor a tumor-inducing plasmid and induce formation of crown galls due to the oncogenes encoded on the transfer DNA. The expression of oncogenes in transformed host cells induces unregulated cell proliferation and metabolic and physiological changes. The crown gall produces opines uncommon to plants, which provide an important nutrient source for A. vitis harboring opine catabolism enzymes. Crown galls host a distinct bacterial community, and the mechanisms establishing a crown gall-specific bacterial community are currently unknown. Thus, we were interested in whether genes homologous to those of the tumor-inducing plasmid coexist in the genomes of the microbial species coexisting in crown galls. We isolated 8 bacterial strains from grapevine crown galls, sequenced their genomes, and tested their virulence and opine utilization ability in bioassays. In addition, the 8 genome sequences were compared with 34 published bacterial genomes, including closely related plant-associated bacteria not from crown galls. Homologous genes for virulence and opine anabolism were only present in the virulent Rhizobiaceae. In contrast, homologs of the opine catabolism genes were present in all strains including the nonvirulent members of the Rhizobiaceae and non-Rhizobiaceae. Gene neighborhood and sequence identity of the opine degradation cluster of virulent and nonvirulent strains together with the results of the opine utilization assay support the important role of opine utilization for cocolonization in crown galls, thereby shaping the crown gall community.
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Affiliation(s)
- Hanna Faist
- Center for Health & Bioresources, Bioresources Unit, AIT Austrian Institute of Technology GmbH, Tulln 3430, Austria
- Julius-von-Sachs Institute for Biological Sciences, Molecular Plant Physiology and Biophysics, University of Würzburg, Würzburg 97082, Germany
| | - Markus J Ankenbrand
- Faculty of Biology, Center for Computational and Theoretical Biology, University of Würzburg, Würzburg 97074, Germany
| | - Wiebke Sickel
- Institute of Biodiversity, Thuenen-Institute of Biodiversity, Braunschweig 38116, Germany
| | - Ute Hentschel
- RD3 Marine Ecology, RU Marine Symbioses, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel 24105, Germany
- Sektion Biologie, Christian-Albrechts University of Kiel, Kiel 24105, Germany
| | - Alexander Keller
- Cellular and Organismic Networks, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried 82152, Germany
| | - Rosalia Deeken
- Julius-von-Sachs Institute for Biological Sciences, Molecular Plant Physiology and Biophysics, University of Würzburg, Würzburg 97082, Germany
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2
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Mayo-Pérez S, Gama-Martínez Y, Dávila S, Rivera N, Hernández-Lucas I. LysR-type transcriptional regulators: state of the art. Crit Rev Microbiol 2023:1-33. [PMID: 37635411 DOI: 10.1080/1040841x.2023.2247477] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 08/03/2023] [Accepted: 08/08/2023] [Indexed: 08/29/2023]
Abstract
The LysR-type transcriptional regulators (LTTRs) are DNA-binding proteins present in bacteria, archaea, and in algae. Knowledge about their distribution, abundance, evolution, structural organization, transcriptional regulation, fundamental roles in free life, pathogenesis, and bacteria-plant interaction has been generated. This review focuses on these aspects and provides a current picture of LTTR biology.
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Affiliation(s)
- S Mayo-Pérez
- Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
| | - Y Gama-Martínez
- Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
| | - S Dávila
- Centro de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - N Rivera
- IPN: CICATA, Unidad Morelos del Instituto Politécnico Nacional, Atlacholoaya, Mexico
| | - I Hernández-Lucas
- Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
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3
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Staphylococcus aureus Host Spectrum Correlates with Methicillin Resistance in a Multi-Species Ecosystem. Microorganisms 2023; 11:microorganisms11020393. [PMID: 36838358 PMCID: PMC9964919 DOI: 10.3390/microorganisms11020393] [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: 11/17/2022] [Revised: 01/23/2023] [Accepted: 01/25/2023] [Indexed: 02/08/2023] Open
Abstract
Although antibiotic resistance is a major issue for both human and animal health, very few studies have investigated the role of the bacterial host spectrum in its dissemination within natural ecosystems. Here, we assessed the prevalence of methicillin resistance among Staphylococcus aureus (MRSA) isolates from humans, non-human primates (NHPs), micromammals and bats in a primatology center located in southeast Gabon, and evaluated the plausibility of four main predictions regarding the acquisition of antibiotic resistance in this ecosystem. MRSA strain prevalence was much higher in exposed species (i.e., humans and NHPs which receive antibiotic treatment) than in unexposed species (micromammals and bats), and in NHP species living in enclosures than those in captivity-supporting the assumption that antibiotic pressure is a risk factor in the acquisition of MRSA that is reinforced by the irregularity of drug treatment. In the two unexposed groups of species, resistance prevalence was high in the generalist strains that infect humans or NHPs, supporting the hypothesis that MRSA strains diffuse to wild species through interspecific transmission of a generalist strain. Strikingly, the generalist strains that were not found in humans showed a higher proportion of MRSA strains than specialist strains, suggesting that generalist strains present a greater potential for the acquisition of antibiotic resistance than specialist strains. The host spectrum is thus a major component of the issue of antibiotic resistance in ecosystems where humans apply strong antibiotic pressure.
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Yates C, Trexler RV, Bonet I, King WL, Hockett KL, Bell TH. Rapid niche shifts in bacteria following conditioning in novel soil environments. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Caylon Yates
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
- Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University University Park PA USA
| | - Ryan V. Trexler
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
- Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University University Park PA USA
| | - Idalys Bonet
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
| | - William L. King
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
- Present address: School of Integrative Plant Science Cornell University Ithaca NY
| | - Kevin L. Hockett
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
- Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University University Park PA USA
| | - Terrence H. Bell
- Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University University Park PA USA
- Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University University Park PA USA
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Torres M, Jiquel A, Jeanne E, Naquin D, Dessaux Y, Faure D. Agrobacterium tumefaciens fitness genes involved in the colonization of plant tumors and roots. THE NEW PHYTOLOGIST 2022; 233:905-918. [PMID: 34655498 DOI: 10.1111/nph.17810] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 10/13/2021] [Indexed: 06/13/2023]
Abstract
Agrobacterium tumefaciens colonizes the galls (plant tumors) it causes, and the roots of host and nonhost plants. Transposon-sequencing (Tn-Seq) was used to discover A.tumefaciens genes involved in reproductive success (fitness genes) on Solanum lycopersicum and Populus trichocarpa tumors and S.lycopersicum and Zea mays roots. The identified fitness genes represent 3-8% of A. tumefaciens genes and contribute to carbon and nitrogen metabolism, synthesis and repair of DNA, RNA and proteins and envelope-associated functions. Competition assays between 12 knockout mutants and wild-type confirmed the involvement of 10 genes (trpB, hisH, metH, cobN, ntrB, trxA, nrdJ, kamA, exoQ, wbbL) in A.tumefaciens fitness under both tumor and root conditions. The remaining two genes (fecA, noxA) were important in tumors only. None of these mutants was nonpathogenic, but four (hisH, trpB, exoQ, ntrB) exhibited impaired virulence. Finally, we used this knowledge to search for chemical and biocontrol treatments that target some of the identified fitness pathways and report reduced tumorigenesis and impaired establishment of A.tumefaciens on tomato roots using tannic acid or Pseudomonas protegens, which affect iron assimilation. This work revealed A.tumefaciens pathways that contribute to its competitive survival in plants and highlights a strategy to identify plant protection approaches against this pathogen.
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Affiliation(s)
- Marta Torres
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
| | - Audren Jiquel
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
| | - Etienne Jeanne
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
| | - Delphine Naquin
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
| | - Yves Dessaux
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
| | - Denis Faure
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91190, France
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Xu N, Yang Q, Yang X, Wang M, Guo M. Reconstruction and analysis of a genome-scale metabolic model for Agrobacterium tumefaciens. MOLECULAR PLANT PATHOLOGY 2021; 22:348-360. [PMID: 33433944 PMCID: PMC7865084 DOI: 10.1111/mpp.13032] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 11/22/2020] [Accepted: 12/07/2020] [Indexed: 05/20/2023]
Abstract
The plant pathogen Agrobacterium tumefaciens causes crown gall disease and is a widely used tool for generating transgenic plants owing to its virulence. The pathogenic process involves a shift from an independent to a living form within a host plant. However, comprehensive analyses of metabolites, genes, and reactions contributing to this complex process are lacking. To gain new insights about the pathogenicity from the viewpoints of physiology and cellular metabolism, a genome-scale metabolic model (GSMM) was reconstructed for A. tumefaciens. The model, referred to as iNX1344, contained 1,344 genes, 1,441 reactions, and 1,106 metabolites. It was validated by analyses of in silico cell growth on 39 unique carbon or nitrogen sources and the flux distribution of carbon metabolism. A. tumefaciens metabolic characteristics under three ecological niches were modelled. A high capacity to access and metabolize nutrients is more important for rhizosphere colonization than in the soil, and substantial metabolic changes were detected during the shift from the rhizosphere to tumour environments. Furthermore, by integrating transcriptome data for tumour conditions, significant alterations in central metabolic pathways and secondary metabolite metabolism were identified. Overall, the GSMM and constraint-based analysis could decode the physiological and metabolic features of A. tumefaciens as well as interspecific interactions with hosts, thereby improving our understanding of host adaptation and infection mechanisms.
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Affiliation(s)
- Nan Xu
- College of Bioscience and BiotechnologyYangzhou UniversityYangzhouChina
| | - Qiyuan Yang
- College of Bioscience and BiotechnologyYangzhou UniversityYangzhouChina
| | - Xiaojing Yang
- College of Bioscience and BiotechnologyYangzhou UniversityYangzhouChina
| | - Mingqi Wang
- College of Bioscience and BiotechnologyYangzhou UniversityYangzhouChina
| | - Minliang Guo
- College of Bioscience and BiotechnologyYangzhou UniversityYangzhouChina
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7
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Gonzalez-Mula A, Lachat J, Mathias L, Naquin D, Lamouche F, Mergaert P, Faure D. The biotroph Agrobacterium tumefaciens thrives in tumors by exploiting a wide spectrum of plant host metabolites. THE NEW PHYTOLOGIST 2019; 222:455-467. [PMID: 30447163 DOI: 10.1111/nph.15598] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 11/03/2018] [Indexed: 05/12/2023]
Abstract
Agrobacterium tumefaciens is a niche-constructing biotroph that exploits host plant metabolites. We combined metabolomics, transposon-sequencing (Tn-seq), transcriptomics, and reverse genetics to characterize A. tumefaciens pathways involved in the exploitation of resources from the Solanum lycopersicum host plant. Metabolomics of healthy stems and plant tumors revealed the common (e.g. sucrose, glutamate) and enriched (e.g. opines, γ-aminobutyric acid (GABA), γ-hydroxybutyric acid (GHB), pyruvate) metabolites that A. tumefaciens could use as nutrients. Tn-seq and transcriptomics pinpointed the genes that are crucial and/or upregulated when the pathogen grew on either sucrose (pgi, kdgA, pycA, cisY) or GHB (blcAB, pckA, eno, gpsA) as a carbon source. While sucrose assimilation involved the Entner-Doudoroff and tricarboxylic acid (TCA) pathways, GHB degradation required the blc genes, TCA cycle, and gluconeogenesis. The tumor-enriched metabolite pyruvate is at the node connecting these pathways. Using reverse genetics, we showed that the blc, pckA, and pycA loci were important for aggressiveness (tumor weight), proliferation (bacterial charge), and/or fitness (competition between the constructed mutants and wild-type) of A. tumefaciens in plant tumors. This work highlighted how a biotroph mobilizes its central metabolism for exploiting a wide diversity of resources in a plant host. It further shows the complementarity of functional genome-wide scans by transcriptomics and Tn-seq to decipher the lifestyle of a plant pathogen.
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Affiliation(s)
- Almudena Gonzalez-Mula
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Joy Lachat
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Léo Mathias
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Delphine Naquin
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Florian Lamouche
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Peter Mergaert
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Denis Faure
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA University Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
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8
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Woodcock SD, Malone JG. Exploitation of the gall: adaption of Agrobacterium to the host metabolome. THE NEW PHYTOLOGIST 2019; 222:8-10. [PMID: 30815944 DOI: 10.1111/nph.15638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Affiliation(s)
| | - Jacob George Malone
- Department of Molecular Microbiology, John Innes Centre, Norwich, NR4 7UH, UK
- School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
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González-Mula A, Lang J, Grandclément C, Naquin D, Ahmar M, Soulère L, Queneau Y, Dessaux Y, Faure D. Lifestyle of the biotroph Agrobacterium tumefaciens in the ecological niche constructed on its host plant. THE NEW PHYTOLOGIST 2018; 219:350-362. [PMID: 29701262 DOI: 10.1111/nph.15164] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/13/2018] [Indexed: 05/23/2023]
Abstract
Agrobacterium tumefaciens constructs an ecological niche in its host plant by transferring the T-DNA from its Ti plasmid into the host genome and by diverting the host metabolism. We combined transcriptomics and genetics for understanding the A. tumefaciens lifestyle when it colonizes Arabidopsis thaliana tumors. Transcriptomics highlighted: a transition from a motile to sessile behavior that mobilizes some master regulators (Hfq, CtrA, DivK and PleD); a remodeling of some cell surface components (O-antigen, succinoglucan, curdlan, att genes, putative fasciclin) and functions associated with plant defense (Ef-Tu and flagellin pathogen-associated molecular pattern-response and glycerol-3-phosphate and nitric oxide signaling); and an exploitation of a wide variety of host resources, including opines, amino acids, sugars, organic acids, phosphate, phosphorylated compounds, and iron. In addition, construction of transgenic A. thaliana lines expressing a lactonase enzyme showed that Ti plasmid transfer could escape host-mediated quorum-quenching. Finally, construction of knock-out mutants in A. tumefaciens showed that expression of some At plasmid genes seemed more costly than the selective advantage they would have conferred in tumor colonization. We provide the first overview of A. tumefaciens lifestyle in a plant tumor and reveal novel signaling and trophic interplays for investigating host-pathogen interactions.
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Affiliation(s)
- Almudena González-Mula
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Julien Lang
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Catherine Grandclément
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Delphine Naquin
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Mohammed Ahmar
- Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires (ICBMS), INSA-Lyon, Université Lyon 1, CNRS, CPE Lyon, ICBMS, UMR5246, INSA Lyon, Villeurbanne, F-69621, France
| | - Laurent Soulère
- Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires (ICBMS), INSA-Lyon, Université Lyon 1, CNRS, CPE Lyon, ICBMS, UMR5246, INSA Lyon, Villeurbanne, F-69621, France
| | - Yves Queneau
- Institut de Chimie et de Biochimie Moléculaires et Supramoléculaires (ICBMS), INSA-Lyon, Université Lyon 1, CNRS, CPE Lyon, ICBMS, UMR5246, INSA Lyon, Villeurbanne, F-69621, France
| | - Yves Dessaux
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
| | - Denis Faure
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, University Paris-Saclay, Gif-sur-Yvette, F-91190, France
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Barton IS, Fuqua C, Platt TG. Ecological and evolutionary dynamics of a model facultative pathogen: Agrobacterium and crown gall disease of plants. Environ Microbiol 2018; 20:16-29. [PMID: 29105274 PMCID: PMC5764771 DOI: 10.1111/1462-2920.13976] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 10/20/2017] [Accepted: 10/25/2017] [Indexed: 01/09/2023]
Abstract
Many important pathogens maintain significant populations in highly disparate disease and non-disease environments. The consequences of this environmental heterogeneity in shaping the ecological and evolutionary dynamics of these facultative pathogens are incompletely understood. Agrobacterium tumefaciens, the causative agent for crown gall disease of plants has proven a productive model for many aspects of interactions between pathogens and their hosts and with other microbes. In this review, we highlight how this past work provides valuable context for the use of this system to examine how heterogeneity and transitions between disease and non-disease environments influence the ecology and evolution of facultative pathogens. We focus on several features common among facultative pathogens, such as the physiological remodelling required to colonize hosts from environmental reservoirs and the consequences of competition with host and non-host associated microbiota. In addition, we discuss how the life history of facultative pathogens likely often results in ecological tradeoffs associated with performance in disease and non-disease environments. These pathogens may therefore have different competitive dynamics in disease and non-disease environments and are subject to shifting selective pressures that can result in pathoadaptation or the within-host spread of avirulent phenotypes.
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Affiliation(s)
- Ian S. Barton
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - Clay Fuqua
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - Thomas G. Platt
- Division of Biology, Kansas State University, Manhattan, KS, USA
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Vigouroux A, El Sahili A, Lang J, Aumont-Nicaise M, Dessaux Y, Faure D, Moréra S. Structural basis for high specificity of octopine binding in the plant pathogen Agrobacterium tumefaciens. Sci Rep 2017; 7:18033. [PMID: 29269740 PMCID: PMC5740067 DOI: 10.1038/s41598-017-18243-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 12/07/2017] [Indexed: 11/09/2022] Open
Abstract
Agrobacterium pathogens of octopine- and nopaline-types force host plants to produce either octopine or nopaline compounds, which they use as nutrients. Two Agrobacterium ABC-transporters and their cognate periplasmic binding proteins (PBPs) OccJ and NocT import octopine and nopaline/octopine, respectively. Here, we show that both octopine transport and degradation confer a selective advantage to octopine-type A. tumefaciens when it colonizes plants. We report the X-ray structures of the unliganded PBP OccJ and its complex with octopine as well as a structural comparison with NocT and the related PBP LAO from Salmonella enterica, which binds amino acids (lysine, arginine and ornithine). We investigated the specificity of OccJ, NocT and LAO using several ligands such as amino acids, octopine, nopaline and octopine analogues. OccJ displays a high selectivity and nanomolar range affinity for octopine. Altogether, the structural and affinity data allowed to define an octopine binding signature in PBPs and to construct a OccJ mutant impaired in octopine binding, a selective octopine-binding NocT and a non-selective octopine-binding LAO by changing one single residue in these PBPs. We proposed the PBP OccJ as a major trait in the ecological specialization of octopine-type Agrobacterium pathogens when they colonize and exploit the plant host.
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Affiliation(s)
- Armelle Vigouroux
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France
| | - Abbas El Sahili
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France.,NTU Institute for Structural Biology, Nanyang Technological University, Experimental Medicine Building, Singapore, 636921, Singapore
| | - Julien Lang
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France.,IPS2, INRA, 91 190, Gif-sur-Yvette, France
| | - Magali Aumont-Nicaise
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France
| | - Yves Dessaux
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France
| | - Denis Faure
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France.
| | - Solange Moréra
- Institute for Integrative Biology of the Cell (I2BC), CNRS CEA Univ. Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, Gif-sur-Yvette, 91198, France.
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