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Nouioui I, Neumann-Schaal M, Pujic P, Fournier P, Normand P, Herrera-Belaroussi A, Vemulapally S, Guerra T, Hahn D. Frankia nepalensis sp. nov., a non-infective non-nitrogen-fixing isolate from root nodules of Coriaria nepalensis Wall. Int J Syst Evol Microbiol 2023; 73. [PMID: 38098135 DOI: 10.1099/ijsem.0.006199] [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] [Indexed: 12/18/2023] Open
Abstract
Strains CN4T, CN6, CN7 and CNm7 were isolated from root nodules of Coriaria nepalensis from Murree in Pakistan. They do not form root nodules on C. nepalensis nor on Alnus glutinosa although they deformed root hairs of Alnus. The colonies are bright red-pigmented, the strains form hyphae and sporangia but no N2-fixing vesicles and do not fix nitrogen in vitro. The peptidoglycan of strain CN4T contains meso-diaminopimelic acid; whole cell sugars consist of ribose, mannose, glucose, galactose and rhamnose. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unknown lipids represent the major polar lipids; MK-9(H4) and MK-9(H6) are the predominant menaquinones (>15 %), and iso-C16 : 0 and C17 : 1ω8c are the major fatty acids (>15 %). The results of comparative 16S rRNA gene sequence analyses indicated that strain CN4T is most closely related to Frankia saprophytica CN 3T. An MLSA phylogeny using amino acids sequences of AtpD, DnaA, FtsZ, Pgk and RpoB, assigned the strain to cluster 4 non-nodulating species, close to F. saprophytica CN 3T , Frankia asymbiotica M16386T and Frankia inefficax EuI1cT with 0.04 substitutions per site, while that value was 0.075 with other strains. Digital DNA-DNA hybridization (dDDH) and average nucleotide identity (ANI) values between CN4T and all species of the genus Frankia with validly published names were below the defined threshold for prokaryotic species demarcation, with dDDH and ANI values at or below 27.8 and 83.7 %, respectively. The four strains CN4T, CN6, CN7 and CNm7 had dDDH (98.6-99.6 %) and ANI values that grouped them as representing a single species. CN4T has a 10.76 Mb genome. CN4T was different from its close phylogenetic neighbours with validly published names in being red-pigmented, in having several lantibiotic-coding clusters, a carbon monoxide dehydrogenase cluster and a clustered regularly interspaced short palindromic repeats (CRISPR) cluster. The results of phenotypic, physiological and phylogenomic analyses confirmed the assignment of strain CN4T (=DSM 114740T = LMG 32595T) to a novel species, with CN4T as type strain, for which the name Frankia nepalensis sp. nov. is proposed.
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Affiliation(s)
- Imen Nouioui
- Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany
| | - Meina Neumann-Schaal
- Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany
| | - Petar Pujic
- Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université de Lyon, Université Claude Bernard Lyon I, INRA, UMR 1418, Villeurbanne 69622 Cedex, France
| | - Pascale Fournier
- Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université de Lyon, Université Claude Bernard Lyon I, INRA, UMR 1418, Villeurbanne 69622 Cedex, France
| | - Philippe Normand
- Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université de Lyon, Université Claude Bernard Lyon I, INRA, UMR 1418, Villeurbanne 69622 Cedex, France
| | - Aude Herrera-Belaroussi
- Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université de Lyon, Université Claude Bernard Lyon I, INRA, UMR 1418, Villeurbanne 69622 Cedex, France
| | - Spandana Vemulapally
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Trina Guerra
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Dittmar Hahn
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
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2
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Nouioui I, Ghodhbane-Gtari F, Jando M, Klenk HP, Gtari M. Frankia colletiae sp. nov., a nitrogen-fixing actinobacterium isolated from Colletia cruciata. Int J Syst Evol Microbiol 2023; 73. [PMID: 36748481 DOI: 10.1099/ijsem.0.005656] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
A nitrogen-fixing actinobacterium strain (Cc1.17T) isolated from a root nodule of Colletia cruciata was subjected to polyphasic taxonomic studies. The strain was characterized by the presence of meso-diaminopimelic acid in its peptidoglycan, galactose, glucose, mannose, rhamnose, ribose and xylose as cell-wall sugars, phosphatidylinositol, diphosphatidylglycerol, glycophospholipids, phosphatidylglycerol, glycophospholipid and uncharacterized lipids as its polar lipids, and C16 : 0, iso-C16 : 0, C17 : 1 ω9 and C18 : 1 ω9 as major fatty acids (>10 %). Strain Cc1.17T showed 16S rRNA gene sequence similarities of 97.4-99.8 % to validly named Frankia species. Phylogenetic trees based on 16S rRNA gene and genome sequences placed strain Cc1.17T in a new lineage within the genus Frankia. Digital DNA-DNA hybridization and average nucleotide identity values between strain Cc1.17T and its closest phylogenomic neighbours were well below the thresholds recommended for prokaryotic species delineation. Therefore, strain Cc1.17T (=DSM 43829T=CECT 9313T) merits recognition as the type strain of a new species for which the name Frankia colletiae sp. nov. is proposed.
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Affiliation(s)
- Imen Nouioui
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124 Braunschweig, Germany
| | - Faten Ghodhbane-Gtari
- Institut Supérieur de Biotechnologie de Sidi Thabet, Université La Manouba, Manouba, Tunisia.,USCR Bactériologie Moléculaire & génomique, Institut National des Sciences Appliquées et de Technologie, Université de Carthage, 1080 Tunis Cedex, Tunisia
| | - Marlen Jando
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124 Braunschweig, Germany
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Maher Gtari
- USCR Bactériologie Moléculaire & génomique, Institut National des Sciences Appliquées et de Technologie, Université de Carthage, 1080 Tunis Cedex, Tunisia
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3
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Nouioui I, Ghodhbane-Gtari F, Pötter G, Klenk HP, Goodfellow M. Novel species of Frankia, Frankia gtarii sp. nov. and Frankia tisai sp. nov., isolated from a root nodule of Alnus glutinosa. Syst Appl Microbiol 2023; 46:126377. [PMID: 36379075 DOI: 10.1016/j.syapm.2022.126377] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 10/17/2022] [Accepted: 10/27/2022] [Indexed: 11/09/2022]
Abstract
The status of four Frankia strains isolated from a root nodule of Alnus glutinosa was established in a polyphasic study. Taxogenomics and phenotypic features show that the isolates belong to the genus Frankia. All four strains form extensively branched substrate mycelia, multilocular sporangia, vesicles, lack aerial hyphae, but contain meso-diaminopimelic acid as the diamino acid of the peptidoglycan, galactose, glucose, mannose, ribose, xylose and traces of rhamnose as cell wall sugars, iso-C16:0 as the predominant fatty acid, diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol as the major polar lipids, have comparable genome sizes to other cluster 1, Alnus-infective strains with structural and accessory genes associated with nitrogen fixation. The genome sizes of the isolates range from 7.0 to 7.7 Mbp and the digital DNA G + C contents from 71.3 to 71.5 %. The four sequenced genomes are rich in biosynthetic gene clusters predicted to express for novel specialized metabolites, notably antibiotics. 16S rRNA gene and whole genome sequence analyses show that the isolates fall into two lineages that are closely related to the type strains of Frankia alni and Frankia torreyi. All of these taxa are separated by combinations of phenotypic properties and by digital DNA:DNA hybridization scores which indicate that they belong to different genomic species. Based on these results, it is proposed that isolates Agncl-4T and Agncl-10, and Agncl-8T and Agncl-18, be recognised as Frankia gtarii sp. nov. and Frankia tisai sp. nov. respectively, with isolates Agncl-4T (=DSM 107976T = CECT 9711T) and Agncl-8T (=DSM 107980T = CECT 9715T) as the respective type strains.
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Affiliation(s)
- Imen Nouioui
- Leibniz Institute DSMZ German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany.
| | - Faten Ghodhbane-Gtari
- Institut Supérieur de Biotechnologie de Sidi Thabet, Université de La Manouba, Tunisia; USCR Bactériologie Moléculaire & Génomique, Institut National des Sciences Appliquées & de Technologie, Université de Carthage, Tunisia
| | - Gabriele Pötter
- Leibniz Institute DSMZ German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne NE1 7RU, UK
| | - Michael Goodfellow
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne NE1 7RU, UK
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Gtari M. Taxogenomic status of phylogenetically distant Frankia clusters warrants their elevation to the rank of genus: A description of Protofrankia gen. nov., Parafrankia gen. nov., and Pseudofrankia gen. nov. as three novel genera within the family Frankiaceae. Front Microbiol 2022; 13:1041425. [PMID: 36425027 PMCID: PMC9680954 DOI: 10.3389/fmicb.2022.1041425] [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: 09/10/2022] [Accepted: 10/12/2022] [Indexed: 11/10/2022] Open
Abstract
The genus Frankia is at present the sole genus in the family Frankiaceae and encompasses filamentous, sporangia-forming actinomycetes principally isolated from root nodules of taxonomically disparate dicotyledonous hosts named actinorhizal plants. Multiple independent phylogenetic analyses agree with the division of the genus Frankia into four well-supported clusters. Within these clusters, Frankia strains are well defined based on host infectivity range, mode of infection, morphology, and their behaviour in culture. In this study, phylogenomics, overall genome related indices (OGRI), together with available data sets for phenotypic and host-plant ranges available for the type strains of Frankia species, were considered. The robustness and the deep radiation observed in Frankia at the subgeneric level, fulfilling the primary principle of phylogenetic systematics, were strengthened by establishing genome criteria for new genus demarcation boundaries. Therefore, the taxonomic elevation of the Frankia clusters to the rank of the genus is proposed. The genus Frankia should be revised to encompass cluster 1 species only and three novel genera, Protofrankia gen. nov., Parafrankia gen. nov., and Pseudofrankia gen. nov., are proposed to accommodate clusters 2, 3, and 4 species, respectively. New combinations for validly named species are also provided.
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Affiliation(s)
- Maher Gtari
- USCR Bactériologie Moléculaire & Génomique, Institut National des Sciences Appliquées et de Technologie, Université de Carthage, Tunis, Tunisia
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Normand P, Pujic P, Abrouk D, Vemulapally S, Guerra T, Carlos-Shanley C, Hahn D. Draft Genomes of Symbiotic Frankia Strains AgB32 and AgKG'84/4 from Root Nodules of Alnus Glutinosa growing under Contrasted Environmental Conditions. J Genomics 2022; 10:61-68. [PMID: 35979511 PMCID: PMC9379372 DOI: 10.7150/jgen.75779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 07/08/2022] [Indexed: 11/08/2022] Open
Abstract
The genomes of two nitrogen-fixing Frankia strains, AgB32 and AgKG'84/4, were isolated from spore-containing (spore+) and spore-free (spore-) root nodules of Alnus glutinosa, but they did not sporulate upon reinfection. The two strains are described as representatives of two novel candidate species. Phylogenomic and ANI analyses indicate that each strain represents a novel species within cluster 1, with genome sizes of 6.3 and 6.7 Mb smaller than or similar to those of other cultivated Alnus-infective cluster 1 strains. Genes essential for nitrogen-fixation, clusters of orthologous genes, secondary metabolite clusters and transcriptional regulators analyzed by comparative genomic analyses were typical of those from Alnus-infective cluster 1 cultivated strains in both genomes. Compared to other cultivated Alnus-infective strains with large genomes, those of AgB32 and AgKG'84/4 had lost 380 or 409 genes, among which one hup cluster, one shc gene and the gvp cluster, which indicates genome erosion is taking place in these two strains.
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Affiliation(s)
- Philippe Normand
- Université Claude-Bernard Lyon 1, Université de Lyon, UMR 5557 CNRS Ecologie Microbienne, Villeurbanne, Cedex 69622, France
| | - Petar Pujic
- Université Claude-Bernard Lyon 1, Université de Lyon, UMR 5557 CNRS Ecologie Microbienne, Villeurbanne, Cedex 69622, France
| | - Danis Abrouk
- Université Claude-Bernard Lyon 1, Université de Lyon, UMR 5557 CNRS Ecologie Microbienne, Villeurbanne, Cedex 69622, France
| | - Spandana Vemulapally
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Trina Guerra
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Camila Carlos-Shanley
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Dittmar Hahn
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
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Klimov PB, Chetverikov PE, Dodueva IE, Vishnyakov AE, Bolton SJ, Paponova SS, Lutova LA, Tolstikov AV. Symbiotic bacteria of the gall-inducing mite Fragariocoptes setiger (Eriophyoidea) and phylogenomic resolution of the eriophyoid position among Acari. Sci Rep 2022; 12:3811. [PMID: 35264574 PMCID: PMC8907322 DOI: 10.1038/s41598-022-07535-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 02/17/2022] [Indexed: 12/13/2022] Open
Abstract
Eriophyoid mites represent a hyperdiverse, phytophagous lineage with an unclear phylogenetic position. These mites have succeeded in colonizing nearly every seed plant species, and this evolutionary success was in part due to the mites' ability to induce galls in plants. A gall is a unique niche that provides the inducer of this modification with vital resources. The exact mechanism of gall formation is still not understood, even as to whether it is endogenic (mites directly cause galls) or exogenic (symbiotic microorganisms are involved). Here we (i) investigate the phylogenetic affinities of eriophyoids and (ii) use comparative metagenomics to test the hypothesis that the endosymbionts of eriophyoid mites are involved in gall formation. Our phylogenomic analysis robustly inferred eriophyoids as closely related to Nematalycidae, a group of deep-soil mites belonging to Endeostigmata. Our comparative metagenomics, fluorescence in situ hybridization, and electron microscopy experiments identified two candidate endosymbiotic bacteria shared across samples, however, it is unlikely that they are gall inducers (morphotype1: novel Wolbachia, morphotype2: possibly Agrobacterium tumefaciens). We also detected an array of plant pathogens associated with galls that may be vectored by the mites, and we determined a mite pathogenic virus (Betabaculovirus) that could be tested for using in biocontrol of agricultural pest mites.
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Affiliation(s)
- Pavel B Klimov
- X-BIO Institute, Tyumen State University, Tyumen, Russia, 625003.
| | | | - Irina E Dodueva
- Saint-Petersburg State University, St. Petersburg, Russia, 199034
| | | | - Samuel J Bolton
- Florida Department of Agriculture and Consumer Services, Gainesville, FL, USA
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Carlos-Shanley C, Guerra T, Hahn D. Draft genomes of non-nitrogen-fixing Frankia strains. J Genomics 2021; 9:68-75. [PMID: 34703504 PMCID: PMC8542509 DOI: 10.7150/jgen.65429] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 09/14/2021] [Indexed: 12/04/2022] Open
Abstract
In this study, we describe the genomes of two novel candidate species of non-nitrogen fixing Frankia that were isolated from the root nodules of Coriaria nepalensis and Alnus glutinosa, genospecies CN and Ag, respectively. Comparative genomic analyses revealed that both genospecies lack genes essential for nitrogen-fixation and possess genes involved in the degradation of plant cell walls. Additionally, we found distinct biosynthetic gene clusters in each genospecies. The availability of these genomes will contribute to the study of the taxonomy and evolution of actinorhizal symbioses.
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Affiliation(s)
- Camila Carlos-Shanley
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Trina Guerra
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
| | - Dittmar Hahn
- Texas State University, Department of Biology, 601 University Drive, San Marcos, TX 78666, USA
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Herrera-Belaroussi A, Normand P, Pawlowski K, Fernandez MP, Wibberg D, Kalinowski J, Brachmann A, Berckx F, Lee N, Blom J, Pozzi AC, Fournier P, Bethencourt L, Dubost A, Abrouk D, Sellstedt A. Candidatus Frankia nodulisporulans sp. nov., an Alnus glutinosa-infective Frankia species unable to grow in pure culture and able to sporulate in-planta. Syst Appl Microbiol 2020; 43:126134. [PMID: 33059155 DOI: 10.1016/j.syapm.2020.126134] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 09/04/2020] [Accepted: 09/07/2020] [Indexed: 11/16/2022]
Abstract
We describe a new Frankia species, for three non-isolated strains obtained from Alnus glutinosa in France and Sweden, respectively. These strains can nodulate several Alnus species (A. glutinosa, A. incana, A. alnobetula), they form hyphae, vesicles and sporangia in the root nodule cortex but have resisted all attempts at isolation in pure culture. Their genomes have been sequenced, they are significantly smaller than those of other Alnus-infective species (5Mb instead of 7.5Mb) and are very closely related to one another (ANI of 100%). The name Candidatus Frankia nodulisporulans is proposed. The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene and draft genome sequences reported in this study for AgTrS, AgUmASt1 and AgUmASH1 are MT023539/LR778176/LR778180 and NZ_CADCWS000000000.1/CADDZU010000001/CADDZW010000001, respectively.
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Affiliation(s)
- Aude Herrera-Belaroussi
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France.
| | - Philippe Normand
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Katharina Pawlowski
- Department of Ecology, Environment and Plant Sciences, Stockholm University, 10691 Stockholm, Sweden
| | - Maria P Fernandez
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Daniel Wibberg
- The Center for Biotechnology CeBiTec, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Jörn Kalinowski
- The Center for Biotechnology CeBiTec, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Andreas Brachmann
- Biocenter of the LMU Munich, Genetics Section, Grosshaderner Str. 2-4, D-82152 Planegg-Martinsried, Germany
| | - Fede Berckx
- Department of Ecology, Environment and Plant Sciences, Stockholm University, 10691 Stockholm, Sweden
| | - Natuschka Lee
- Department of Ecology and Environmental Science, Umeå University, 90187 Umeå, Sweden
| | - Jochen Blom
- Bioinformatics & Systems Biology, Justus-Liebig-University, 35392 Giessen, Hesse, Germany
| | - Adrien C Pozzi
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Pascale Fournier
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Lorine Bethencourt
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Audrey Dubost
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Danis Abrouk
- Université de Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Anita Sellstedt
- Department of Plant Physiology, UPSC, Umeå University, 90187 Umeå, Sweden.
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Pozzi ACM, Herrera-Belaroussi A, Schwob G, Bautista-Guerrero HH, Bethencourt L, Fournier P, Dubost A, Abrouk D, Normand P, Fernandez MP. Proposal of ' Candidatus Frankia alpina', the uncultured symbiont of Alnus alnobetula and A. incana that forms spore-containing nitrogen-fixing root nodules. Int J Syst Evol Microbiol 2020; 70:5453-5459. [PMID: 32910750 DOI: 10.1099/ijsem.0.004433] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The members of the genus Frankia are, with a few exceptions, a group of nitrogen-fixing symbiotic actinobacteria that nodulate mostly woody dicotyledonous plants belonging to three orders, eight families and 23 genera of pioneer dicots. These bacteria have been characterized phylogenetically and grouped into four molecular clusters. One of the clusters, cluster 1 contains strains that induce nodules on Alnus spp. (Betulaceae), Myrica spp., Morella spp. and Comptonia spp. (Myricaceae) that have global distributions. Some of these strains produce not only hyphae and vesicles, as other cluster 1 strains do, but also numerous sporangia in their host symbiotic tissues, hence their phenotype being described as spore-positive (Sp+). While Sp+ strains have resisted repeated attempts at cultivation, their genomes have recently been characterized and found to be different from those of all described species, being markedly smaller than their phylogenetic neighbours. We thus hereby propose to create a 'Candidatus Frankia alpina' species for some strains present in nodules of Alnus alnobetula and A. incana that grow in alpine environments at high altitudes or in subarctic environments at high latitudes.
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Affiliation(s)
- Adrien C Meynier Pozzi
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Aude Herrera-Belaroussi
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Guillaume Schwob
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Hector H Bautista-Guerrero
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Lorine Bethencourt
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Pascale Fournier
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Audrey Dubost
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Danis Abrouk
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Philippe Normand
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
| | - Maria P Fernandez
- Université de Lyon, F-69622, Lyon, France; Université Lyon 1, Villeurbanne, CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France; INRA, UMR1418, Villeurbanne, France
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10
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Gtari M, Ghodhbane-Gtari F, Nouioui I. Frankia soli sp. nov., an actinobacterium isolated from soil beneath Ceanothus jepsonii. Int J Syst Evol Microbiol 2019; 70:1203-1209. [PMID: 31829914 DOI: 10.1099/ijsem.0.003899] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Actinobacterial strain CjT was directly isolated from soil beneath Ceanothus jepsonii growing in the USA. The strain formed cell structures typical of the genus Frankia including extensive hyphae, vesicles and sporangia, and it effectively nodulated members of the actinorhizal Colletieae, Elaeagnaceae and Myricaceae. The whole-cell hydrolysate of strain CjT was rich in meso-diaminopimelic acid and galactose, glucose, mannose, xylose, ribose and a trace of rhamnose. Tbe polar lipid profile contained phosphatidylinositol, phosphatidylglycerol, diphosphatidylglycerol and glycophospholipid. The menaquinone was predominantly MK-9(H4). The fatty acid profile predominantly consisted of C17 : 1ω8c, iso-C16 : 0, C15:0, C16 : 0 and C17 : 0. A multilocus sequence analysis phylogeny based on atp1, ftsZ, dnaK, gyrA and secA gene sequences positioned the strain within Elaeagnaceae- and Colletieae-nodulating species together with Frankia elaeagni DSM 46783T, Frankia discariae DSM 46785T and Frankia irregularis DSM 45899T. Pairwise 16S rRNA gene sequence similarities showed that strain CjT was most closely related to F. discariae DSM 46785T (99.78 %) while their digital DNA-DNA hybridization value was 41.1 %. Based on the overall analyses, strain CjT (=DSM 100623T=CECT 9041T) warrants classification as the type strain of a novel species, for which the name Frankia soli sp. nov. is proposed.
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Affiliation(s)
- Maher Gtari
- Unité de Bactériologie Moléculaire et Génomique, Université Carthage (INSAT), Centre Urbain Nord, BP 676-1080 Tunis Cedex, Tunisia
| | - Faten Ghodhbane-Gtari
- Laboratoire Microorganismes et Biomolécules Actives, Université Tunis El Manar (FST), 2092, Tunis, Tunisia.,Unité de Bactériologie Moléculaire et Génomique, Université Carthage (INSAT), Centre Urbain Nord, BP 676-1080 Tunis Cedex, Tunisia
| | - Imen Nouioui
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
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11
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Bethencourt L, Vautrin F, Taib N, Dubost A, Castro-Garcia L, Imbaud O, Abrouk D, Fournier P, Briolay J, Nguyen A, Normand P, Fernandez MP, Brochier-Armanet C, Herrera-Belaroussi A. Draft genome sequences for three unisolated Alnus-infective Frankia Sp+ strains, AgTrS, AiOr and AvVan, the first sequenced Frankia strains able to sporulate in-planta. J Genomics 2019; 7:50-55. [PMID: 31588247 PMCID: PMC6775861 DOI: 10.7150/jgen.35875] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 07/22/2019] [Indexed: 12/13/2022] Open
Abstract
Actinobacteria from genus Frankia are able to form symbiotic associations with actinorhizal plants including alders. Among them, Sp+ strains are characterized by their ability to differentiate numerous sporangia inside host plant cells (unlike "Sp-" strains unable of in-planta sporulation). Here, we report the first genome sequences of three unisolated Sp+ strains: AgTrS, AiOr and AvVan obtained from Alnus glutinosa, A. incana and A. alnobetula (previously known as viridis), respectively (with genome completeness estimated at more than 98%). They represent new Frankia species based on Average Nucleotide Identity (ANI) calculations, and the smallest Alnus-infective Frankia genomes so far sequenced (~5 Mbp), with 5,178, 6,192 and 5,751 candidate protein-encoding genes for AgTrS, AiOr and AvVan, respectively.
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Affiliation(s)
- Lorine Bethencourt
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Florian Vautrin
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Najwa Taib
- Univ Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Évolutive, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Audrey Dubost
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Lucia Castro-Garcia
- Univ Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Évolutive, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Olivier Imbaud
- Univ Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Évolutive, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Danis Abrouk
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Pascale Fournier
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Jérôme Briolay
- Univ Lyon, Université Lyon 1, DTAMB, FR 3728 BioEnviS, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Agnès Nguyen
- Biofidal, 170 av Gabriel Péri, F-69518 Vaulx-en-Velin, France
| | - Philippe Normand
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Maria P. Fernandez
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Céline Brochier-Armanet
- Univ Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Évolutive, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
| | - Aude Herrera-Belaroussi
- Univ Lyon, Université Lyon 1, CNRS, UMR5557, Ecologie Microbienne, INRA, UMR 1418, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France
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12
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Nguyen TV, Wibberg D, Vigil-Stenman T, Berckx F, Battenberg K, Demchenko KN, Blom J, Fernandez MP, Yamanaka T, Berry AM, Kalinowski J, Brachmann A, Pawlowski K. Frankia-Enriched Metagenomes from the Earliest Diverging Symbiotic Frankia Cluster: They Come in Teams. Genome Biol Evol 2019; 11:2273-2291. [PMID: 31368478 PMCID: PMC6735867 DOI: 10.1093/gbe/evz153] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2019] [Indexed: 11/14/2022] Open
Abstract
Frankia strains induce the formation of nitrogen-fixing nodules on roots of actinorhizal plants. Phylogenetically, Frankia strains can be grouped in four clusters. The earliest divergent cluster, cluster-2, has a particularly wide host range. The analysis of cluster-2 strains has been hampered by the fact that with two exceptions, they could never be cultured. In this study, 12 Frankia-enriched metagenomes of Frankia cluster-2 strains or strain assemblages were sequenced based on seven inoculum sources. Sequences obtained via DNA isolated from whole nodules were compared with those of DNA isolated from fractionated preparations enhanced in the Frankia symbiotic structures. The results show that cluster-2 inocula represent groups of strains, and that strains not represented in symbiotic structures, that is, unable to perform symbiotic nitrogen fixation, may still be able to colonize nodules. Transposase gene abundance was compared in the different Frankia-enriched metagenomes with the result that North American strains contain more transposase genes than Eurasian strains. An analysis of the evolution and distribution of the host plants indicated that bursts of transposition may have coincided with niche competition with other cluster-2 Frankia strains. The first genome of an inoculum from the Southern Hemisphere, obtained from nodules of Coriaria papuana in Papua New Guinea, represents a novel species, postulated as Candidatus Frankia meridionalis. All Frankia-enriched metagenomes obtained in this study contained homologs of the canonical nod genes nodABC; the North American genomes also contained the sulfotransferase gene nodH, while the genome from the Southern Hemisphere only contained nodC and a truncated copy of nodB.
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Affiliation(s)
- Thanh Van Nguyen
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Sweden
| | - Daniel Wibberg
- Center for Biotechnology (CeBiTec), Bielefeld University, Germany
| | | | - Fede Berckx
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Sweden
| | - Kai Battenberg
- Department of Plant Sciences, University of California, Davis
| | - Kirill N Demchenko
- Laboratory of Cellular and Molecular Mechanisms of Plant Development, Komarov Botanical Institute, Russian Academy of Sciences, Saint Petersburg, Russia
- Laboratory of Molecular and Cellular Biology, All-Russia Research Institute for Agricultural Microbiology, Saint Petersburg, Russia
| | - Jochen Blom
- Bioinformatics and Systems Biology, Justus Liebig University, Gießen, Germany
| | - Maria P Fernandez
- Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université Lyon I, Villeurbanne Cedex, France
| | | | - Alison M Berry
- Department of Plant Sciences, University of California, Davis
| | - Jörn Kalinowski
- Center for Biotechnology (CeBiTec), Bielefeld University, Germany
| | - Andreas Brachmann
- Biocenter, Ludwig Maximilians University Munich, Planegg-Martinsried, Germany
| | - Katharina Pawlowski
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Sweden
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13
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Lau ICK, Feyereisen R, Nelson DR, Bell SG. Analysis and preliminary characterisation of the cytochrome P450 monooxygenases from Frankia sp. EuI1c (Frankia inefficax sp.). Arch Biochem Biophys 2019; 669:11-21. [PMID: 31082352 DOI: 10.1016/j.abb.2019.05.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/09/2019] [Accepted: 05/09/2019] [Indexed: 10/26/2022]
Abstract
Frankia bacteria are nitrogen fixing species from the Actinobacterium phylum which live on the root nodules of plants. They have been hypothesised to have significant potential for natural product biosynthesis. The cytochrome P450 monooxygenase complement of Frankia sp. EuI1c (Frankia inefficax sp.), which comprises 68 members, was analysed. Several members belonged to previously uncharacterised bacterial P450 families. There was an unusually high number of CYP189 family members (21) suggesting that this family has undergone gene duplication events which are classified as "blooms". The likely electron transfer partners for the P450 enzymes were also identified and analysed. These consisted of predominantly [3Fe-4S] cluster containing ferredoxins (eight), a single [2Fe-2S] ferredoxin and a couple of ferredoxin reductases. Three of these CYP family members were produced and purified, using Escherichia coli as a host, and their substrate range was characterised. CYP1027H1 and CYP150A20 bound a broad range of norisoprenoids and terpenoids. CYP1074A2 was highly specific for certain steroids including testosterone, progesterone, stanolone and 4-androstene-3,17-dione. It is likely that steroids are the physiological substrates of CYP1074A2. These results also give an indication that terpenoids are the likely substrates of CYP1027H1 and CYP150A2. The large number of P450s belonging to distinct families as well as the associated electron transfer partners found in different Frankia strains highlights the importance of this family of enzymes has in the secondary metabolism of these bacteria.
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Affiliation(s)
- Ian C K Lau
- Department of Chemistry, University of Adelaide, Adelaide, SA, 5005, Australia
| | - René Feyereisen
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - David R Nelson
- University of Tennessee Health Science Center, Dept. of Microbiology, Immunology and Biochemistry, 858 Madison Ave. Suite G01, Memphis, TN, 38163, USA
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, Adelaide, SA, 5005, Australia.
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14
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Nouioui I, Cortés-albayay C, Carro L, Castro JF, Gtari M, Ghodhbane-Gtari F, Klenk HP, Tisa LS, Sangal V, Goodfellow M. Genomic Insights Into Plant-Growth-Promoting Potentialities of the Genus Frankia. Front Microbiol 2019; 10:1457. [PMID: 31333602 PMCID: PMC6624747 DOI: 10.3389/fmicb.2019.01457] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 06/11/2019] [Indexed: 12/19/2022] Open
Abstract
This study was designed to determine the plant growth promoting (PGP) potential of members of the genus Frankia. To this end, the genomes of 21 representative strains were examined for genes associated directly or indirectly with plant growth. All of the Frankia genomes contained genes that encoded for products associated with the biosynthesis of auxins [indole-3-glycerol phosphate synthases, anthranilate phosphoribosyltransferases (trpD), anthranilate synthases, and aminases (trpA and B)], cytokinins (11 well-conserved genes within the predicted biosynthetic gene cluster), siderophores, and nitrogenases (nif operon except for atypical Frankia) as well as genes that modulate the effects of biotic and abiotic environmental stress (e.g., alkyl hydroperoxide reductases, aquaporin Z, heat shock proteins). In contrast, other genes were associated with strains assigned to one or more of four host-specific clusters. The genes encoding for phosphate solubilization (e.g., low-affinity inorganic phosphate transporters) and lytic enzymes (e.g., cellulases) were found in Frankia cluster 1 genomes, while other genes were found only in cluster 3 genomes (e.g., alkaline phosphatases, extracellular endoglucanases, pectate lyases) or cluster 4 and subcluster 1c genomes (e.g., NAD(P) transhydrogenase genes). Genes encoding for chitinases were found only in the genomes of the type strains of Frankia casuarinae, F. inefficax, F. irregularis, and F. saprophytica. In short, these in silico genome analyses provide an insight into the PGP abilities of Frankia strains of known taxonomic provenance. This is the first study designed to establish the underlying genetic basis of cytokinin production in Frankia strains. Also, the discovery of additional genes in the biosynthetic gene cluster involved in cytokinin production opens up the prospect that Frankia may have novel molecular mechanisms for cytokinin biosynthesis.
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Affiliation(s)
- Imen Nouioui
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Carlos Cortés-albayay
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Lorena Carro
- Microbiology and Genetics Department, Universidad de Salamanca, Salamanca, Spain
| | - Jean Franco Castro
- The Chilean Collection of Microbial Genetic Resources (CChRGM), Instituto de Investigaciones Agropecuarias (INIA) – Quilamapu, Chillán, Chile
| | - Maher Gtari
- Institut National des Sciences Appliquées et de Technologie, Université de Carthage Centre Urbain Nord, Tunis, Tunisia
| | - Faten Ghodhbane-Gtari
- Institut National des Sciences Appliquées et de Technologie, Université de Carthage Centre Urbain Nord, Tunis, Tunisia
- Laboratoire Microorganismes et Biomolécules Actives, Faculté de Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Louis S. Tisa
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH, United States
| | - Vartul Sangal
- Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
| | - Michael Goodfellow
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
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15
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Gtari M, Nouioui I, Sarkar I, Ghodhbane-Gtari F, Tisa LS, Sen A, Klenk HP. An update on the taxonomy of the genus Frankia Brunchorst, 1886, 174 AL. Antonie van Leeuwenhoek 2018; 112:5-21. [PMID: 30232679 DOI: 10.1007/s10482-018-1165-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 09/14/2018] [Indexed: 12/30/2022]
Abstract
Since the recognition of the name Frankia in the Approved Lists of bacterial names (1980), few amendments have been given to the genus description. Successive editions of Bergey's Manual of Systematics of Archaea and Bacteria have broadly conflicting suprageneric treatments of the genus without any advances for subgeneric classification. This review focuses on recent results from taxongenomics and phenoarray approaches to the positioning and the structuring of the genus Frankia. Based on phylogenomic analyses, Frankia should be considered the single member of the family Frankiaceae within the monophyletic order, Frankiales. A polyphasic strategy incorporating genome to genome data and omniLog® phenoarrays, together with classical approaches, has allowed the designation and an amended description of a type strain of the type species Frankia alni, and the recognition of at least 10 novel species covering symbiotic and non symbiotic taxa within the genus. Genome to phenome data will be shortly incorporated in the scheme for proposing novel species including those recalcitrant to isolation in axenic culture.
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Affiliation(s)
- Maher Gtari
- Institut National des Sciences Appliquées et de Technologie, Université Carthage, Centre Urbain Nord, BP 676-1080, Tunis Cedex, Tunisia.
| | - Imen Nouioui
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Indrani Sarkar
- NBU Bioinformatics Facility, Department of Botany, University of North Bengal, Siliguri, 734013, India
| | - Faten Ghodhbane-Gtari
- Institut National des Sciences Appliquées et de Technologie, Université Carthage, Centre Urbain Nord, BP 676-1080, Tunis Cedex, Tunisia.,Laboratoire Microorganismes et Biomolécules Actives, Université Tunis El Manar, 2092, Tunis, Tunisia
| | - Louis S Tisa
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, 46 College Road, Durham, NH, 03824-2617, USA
| | - Arnab Sen
- NBU Bioinformatics Facility, Department of Botany, University of North Bengal, Siliguri, 734013, India
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
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16
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Nouioui I, Ghodhbane-Gtari F, Jando M, Tisa LS, Klenk HP, Gtari M. Frankia torreyi sp. nov., the first actinobacterium of the genus Frankia Brunchorst 1886, 174 AL isolated in axenic culture. Antonie van Leeuwenhoek 2018; 112:57-65. [PMID: 30030730 DOI: 10.1007/s10482-018-1131-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 07/12/2018] [Indexed: 11/30/2022]
Abstract
Strain CpI1T was, in 1978, the first isolate of the genus Frankia to be obtained from Comptonia peregrina root nodules. In this study, a polyphasic approach was performed to identify the taxonomic position of strain CpI1T among the members of the genus Frankia. The strain contains meso-diaminopimelic acid as the diagnostic diamino acid and galactose, glucose, mannose, rhamnose, ribose and xylose as cell wall sugars. The polar lipids were found to consist of phosphatidylinositol, diphosphatidylglycerol, glycophospholipids, phosphatidylglycerol, an aminophospholipid and unidentified phospholipids and lipids. The predominant menaquinone was identified as MK-9 (H8), while the major fatty acid are iso-C16:0 and C17:1ω 8c. The 16S rRNA gene sequence identity varies from 97.4 to 99.6% with the type strains of currently described Frankia species. Phylogenetic analyses based on 16S rRNA gene sequences and multi-locus sequence analysis (MLSA) using atp1, ftsZ, dnaK, gyrA and secA gene sequences showed that strain CpI1T is closely related to Frankia alni ACN14aT. The genome size of strain CpI1T is 7.6 Mb with a digital DNA G+C content of 72.4%. Digital DNA:DNA hybridization (values between strain CpI1T and its close phylogenetic relative F. alni ACN14aT was 44.1%, well below the threshold of 70% for distinguishing between bacterial genomic species. Based on the phenotypic, phylogenetic and genomic data, strain CpI1T (= DSM44263T = CECT9035T) warrants classification as the type strain of a novel species, for which the name Frankia torreyi sp. nov. is proposed.
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Affiliation(s)
- Imen Nouioui
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Faten Ghodhbane-Gtari
- Laboratoire Microorganismes et Biomolécules Actives, Université Tunis El Manar (FST), 2092, Tunis, Tunisia.,Institut National des Sciences Appliquées et de Technologie, Université Carthage, Centre Urbain Nord, BP 676-1080, Tunis Cedex, Tunisia
| | - Marlen Jando
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstraße 7B, 38124, Brunswick, Germany
| | - Louis S Tisa
- Department of Molecular, Cellular, and Biomedical Sciences, University of New Hampshire, Durham, USA
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Maher Gtari
- Institut National des Sciences Appliquées et de Technologie, Université Carthage, Centre Urbain Nord, BP 676-1080, Tunis Cedex, Tunisia.
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17
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Nouioui I, Ghodhbane-Gtari F, Rhode M, Sangal V, Klenk HP, Gtari M. Frankia irregularis sp. nov., an actinobacterium unable to nodulate its original host, Casuarina equisetifolia, but effectively nodulates members of the actinorhizal Rhamnales. Int J Syst Evol Microbiol 2018; 68:2883-2914. [PMID: 30010524 DOI: 10.1099/ijsem.0.002914] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A red pigmented actinobacterium designated G2T, forming extremely branched vegetative hyphae, vesicles and mutilocular sporangia, was isolated from Casuarina equisetifolia nodules. The strain failed to nodulate its original host plant but effectively nodulated members of actinorhizal Rhamnales. The taxonomic position of G2T was determined using a polyphasic approach. The peptidoglycan of the strain contained meso-diaminopimelic acid as diagnostic diamino acid, galactose, glucose, mannose, rhamnose, ribose and xylose. The polar lipid pattern consisted of phosphatidylinositol (PI), diphosphatidylglycerol (DPG), glycophospholipids (GPL1-2), phosphatidylglycerol (PG), aminophospholipid (APL) and unknown lipids (L). The predominant menaquinones were MK-9 (H4) and MK-9 (H6) while the major fatty acids were iso-C16 : 0, C17 : 1ω8c and C15 : 0. The size of the genome of G2T was 9.5 Mb and digital DNA G+C content was 70.9 %. The 16S rRNA gene showed 97.4-99.5 % sequence identity with the type strains of species of the genus Frankia. Digital DNA -DNA hybridisation (dDDH) values between G2T and its nearest phylogenetic neighbours Frankia elaeagniand Frankia discariaewere below the threshold of 70 %. On the basis of these results, strain G2T (=DSM 45899T=CECT 9038T) is proposed to represent the type strain of a novel species Frankia irregularis sp. nov.
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Affiliation(s)
- Imen Nouioui
- 1School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Faten Ghodhbane-Gtari
- 2Laboratoire Microorganismes et Biomolécules Actives, Faculté des Sciences de Tunis, Université Tunis El Manar, 2092 Tunis, Tunisia
| | - Manfred Rhode
- 3Central Facility for Microscopy, HZI-Helmholtz Centre for Infection Research, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Vartul Sangal
- 4Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Hans-Peter Klenk
- 1School of Natural and Environmental Sciences, Newcastle University, Ridley Building 2, Newcastle upon Tyne, NE1 7RU, UK
| | - Maher Gtari
- 5Institut National des Sciences Appliquées et de Technologie, Université Carthage, Centre Urbain Nord, BP 676-1080 Tunis Cedex, Tunisia
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