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      High-Quality Draft Genome Sequence of the Xanthomonas translucens pv. cerealis Pathotype Strain CFBP 2541

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          Abstract

          Xanthomonas translucens pv. cerealis is the causal agent of bacterial leaf streak on true grasses. The genome of the pathotype strain CFBP 2541 was sequenced in order to decipher mechanisms that provoke disease and to elucidate the role of transcription activator-like (TAL) type III effectors in pathogenicity.

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          Xanthomonas AvrBs3 family-type III effectors: discovery and function.

          Xanthomonads are bacterial plant pathogens that cause diseases on many plant species, including important crops. Key to pathogenicity of most Xanthomonas pathovars is a Hrp-type III secretion (T3S) system that translocates effector proteins into plant cells. Within the eukaryotic cell, the effectors are thought to perform a variety of tasks to support bacterial virulence, proliferation, and dissemination. We are only beginning to understand the host targets of different effectors. The largest effector family found in Xanthomonas spp. is the AvrBs3/PthA or TAL (transcription activator-like) family. TAL effectors act as transcriptional activators in the plant cell nucleus. Specificity of TAL effectors is determined by a novel modular DNA-binding domain. Here, we describe the discovery of TAL effectors and their structure, activity, and host targets.
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            Reclassification of Xanthomonas

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              A multilocus sequence analysis of the genus Xanthomonas.

              A multilocus sequence analysis (MLSA) of strains representing all validly published Xanthomonas spp. (119 strains) was conducted using four genes; dnaK, fyuA, gyrB and rpoD, a total of 440 sequences. Xanthomonas spp. were divided into two groups similar to those indicated in earlier 16S rDNA comparative analyses, and they possibly represent distinct genera. The analysis clearly differentiated most species that have been established by DNA-DNA reassociation. A similarity matrix of the data indicated clear numerical differences that could form the basis for species differentiation in the future, as an alternative to DNA-DNA reassociation. Some species, X. cynarae, X. gardneri and X. hortorum, formed a single heterogeneous group that is in need of further investigation. X. gardneri appeared to be a synonym of X. cynarae. Recently proposed new species, X. alfalfae, X. citri, X. euvesicatoria, X. fuscans and X. perforans, were not clearly differentiated as species from X. axonopodis, and X. euvesicatoria and X. perforans are very probably synonyms. MLSA offers a powerful tool for further investigation of the classification of Xanthomonas. Based on the dataset produced, the method also offers a relatively simple way of identifying strains as members of known species, or of indicating their status as members of new species.
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                Author and article information

                Journal
                Genome Announc
                Genome Announc
                ga
                ga
                GA
                Genome Announcements
                American Society for Microbiology (1752 N St., N.W., Washington, DC )
                2169-8287
                12 February 2015
                Jan-Feb 2015
                : 3
                : 1
                : e01574-14
                Affiliations
                [a ]UMR 186 IRD-Cirad-Université Montpellier 2 Résistance des Plantes aux Bioagresseurs, Montpellier, France
                [b ]Earth and Life Institute, Applied Microbiology Phytopathology, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
                [c ]INRA, Laboratoire des Interactions Plantes Micro-organismes (LIPM), UMR 441, Castanet-Tolosan, France
                [d ]CNRS, LIPM, UMR 2594, Castanet-Tolosan, France
                [e ]INRA, UMR1345 Institut de Recherche en Horticulture et Semences (IRHS), Angers, France
                [f ]Agrocampus Ouest, UMR1345 IRHS, Angers, France
                [g ]Université d’Angers, UMR1345 IRHS, SFR4207 QUASAV, PRES L’UNAM, Angers, France
                [h ]INRA, CIRM-CFBP Collection Française de Bactéries associées aux Plantes, Angers, France
                [i ]UMR Peuplements Végétaux et Bioagresseurs en Milieu Tropical (PVBMT), CIRAD, Saint-Pierre, La Réunion, France
                [j ]Université Paul Sabatier, Toulouse, France
                Author notes
                Address correspondence to Ralf Koebnik, koebnik@ 123456gmx.de .
                Author information
                http://orcid.org/0000-0002-2943-0827
                http://orcid.org/0000-0002-4419-0542
                Article
                genomeA01574-14
                10.1128/genomeA.01574-14
                4333671
                25676771
                50f2aa8e-9150-4c9b-88ad-62e353295662
                Copyright © 2015 Pesce et al.

                This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 Unported license.

                History
                : 29 December 2014
                : 5 January 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 13, Pages: 2, Words: 1299
                Categories
                Prokaryotes
                Custom metadata
                January/February 2015
                free

                Genetics
                Genetics

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