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  1. Article ; Online: The Versatile Roles of Type III Secretion Systems in Rhizobium-Legume Symbioses.

    Teulet, Albin / Camuel, Alicia / Perret, Xavier / Giraud, Eric

    Annual review of microbiology

    2022  Volume 76, Page(s) 45–65

    Abstract: To suppress plant immunity and promote the intracellular infection required for fixing nitrogen for the benefit of their legume hosts, many rhizobia use type III secretion systems (T3SSs) that deliver effector proteins (T3Es) inside host cells. As ... ...

    Abstract To suppress plant immunity and promote the intracellular infection required for fixing nitrogen for the benefit of their legume hosts, many rhizobia use type III secretion systems (T3SSs) that deliver effector proteins (T3Es) inside host cells. As reported for interactions between pathogens and host plants, the immune system of legume hosts and the cocktail of T3Es secreted by rhizobia determine the symbiotic outcome. If they remain undetected, T3Es may reduce plant immunity and thus promote infection of legumes by rhizobia. If one or more of the secreted T3Es are recognized by the cognate plant receptors, defense responses are triggered and rhizobial infection may abort. However, some rhizobial T3Es can also circumvent the need for nodulation (Nod) factors to trigger nodule formation. Here we review the multifaceted roles played by rhizobial T3Es during symbiotic interactions with legumes.
    MeSH term(s) Fabaceae/metabolism ; Plant Immunity ; Rhizobium/metabolism ; Symbiosis/physiology ; Type III Secretion Systems/metabolism
    Chemical Substances Type III Secretion Systems
    Language English
    Publishing date 2022-04-08
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 207931-8
    ISSN 1545-3251 ; 0066-4227
    ISSN (online) 1545-3251
    ISSN 0066-4227
    DOI 10.1146/annurev-micro-041020-032624
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  2. Article ; Online: A glutamate synthase mutant of Bradyrhizobium sp. strain ORS285 is unable to induce nodules on Nod factor-independent Aeschynomene species.

    Nouwen, Nico / Chaintreuil, Clémence / Fardoux, Joel / Giraud, Eric

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 20910

    Abstract: The Bradyrhizobium sp. strain ORS285 is able to establish a nitrogen-fixing symbiosis with both Nod factor (NF) dependent and NF-independent Aeschynomene species. Here, we have studied the growth characteristics and symbiotic interaction of a glutamate ... ...

    Abstract The Bradyrhizobium sp. strain ORS285 is able to establish a nitrogen-fixing symbiosis with both Nod factor (NF) dependent and NF-independent Aeschynomene species. Here, we have studied the growth characteristics and symbiotic interaction of a glutamate synthase (GOGAT; gltD::Tn5) mutant of Bradyrhizobium ORS285. We show that the ORS285 gltD::Tn5 mutant is unable to use ammonium, nitrate and many amino acids as nitrogen source for growth and is unable to fix nitrogen under free-living conditions. Moreover, on several nitrogen sources, the growth rate of the gltB::Tn5 mutant was faster and/or the production of the carotenoid spirilloxanthin was much higher as compared to the wild-type strain. The absence of GOGAT activity has a drastic impact on the symbiotic interaction with NF-independent Aeschynomene species. With these species, inoculation with the ORS285 gltD::Tn5 mutant does not result in the formation of nodules. In contrast, the ORS285 gltD::Tn5 mutant is capable to induce nodules on NF-dependent Aeschynomene species, but these nodules were ineffective for nitrogen fixation. Interestingly, in NF-dependent and NF-independent Aeschynomene species inoculation with the ORS285 gltD::Tn5 mutant results in browning of the plant tissue at the site of the infection suggesting that the mutant bacteria induce plant defence responses.
    MeSH term(s) Bacterial Proteins/genetics ; Bradyrhizobium/genetics ; Fabaceae/microbiology ; Glutamate Synthase/genetics ; Nitrogen Fixation/physiology ; Nitrogenase/metabolism ; Photosynthesis/physiology ; Phylogeny ; Root Nodules, Plant/microbiology ; Symbiosis/physiology
    Chemical Substances Bacterial Proteins ; Nitrogenase (EC 1.18.6.1) ; Glutamate Synthase (EC 1.4.1.13)
    Language English
    Publishing date 2021-10-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-00480-7
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  3. Article: Role of two RpoN in

    Wongdee, Jenjira / Piromyou, Pongdet / Songwattana, Pongpan / Greetatorn, Teerana / Teaumroong, Neung / Boonkerd, Nantakorn / Giraud, Eric / Nouwen, Nico / Tittabutr, Panlada

    Frontiers in microbiology

    2023  Volume 14, Page(s) 1131860

    Abstract: RpoN is an alternative sigma factor (sigma 54) that recruits the core RNA polymerase to promoters of genes. In bacteria, RpoN has diverse physiological functions. In rhizobia, RpoN plays a key role in the transcription of nitrogen fixation ( ...

    Abstract RpoN is an alternative sigma factor (sigma 54) that recruits the core RNA polymerase to promoters of genes. In bacteria, RpoN has diverse physiological functions. In rhizobia, RpoN plays a key role in the transcription of nitrogen fixation (
    Language English
    Publishing date 2023-02-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2023.1131860
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  4. Article: The Modification of the Flavonoid Naringenin by Bradyrhizobium sp. Strain ORS285 Changes the nod Genes Inducer Function to a Growth Stimulator

    Nouwen, Nico / Gargani, Daniel / Giraud, Eric

    Molecular plant-microbe interactions. 2019 Nov., v. 32, no. 11

    2019  

    Abstract: As inducers of nodulation (nod) genes, flavonoids play an important role in the symbiotic interaction between rhizobia and legumes. However, in addition to the control of expression of nod genes, many other effects of flavonoids on rhizobial cells have ... ...

    Abstract As inducers of nodulation (nod) genes, flavonoids play an important role in the symbiotic interaction between rhizobia and legumes. However, in addition to the control of expression of nod genes, many other effects of flavonoids on rhizobial cells have been described. Here, we show that the flavonoid naringenin stimulates the growth of the photosynthetic Bradyrhizobium sp. strain ORS285. This growth-stimulating effect was still observed for strain ORS285 with nodD1, nodD2, or the naringenin-degrading fde operon deleted. Phenotypic microarray analysis indicates that in cells grown in the presence of naringenin, the glycerol and fatty acid metabolism is activated. Moreover, electron microscopic and enzymatic analyses show that polyhydroxy alkanoate metabolism is altered in cells grown in the presence of naringenin. Although strain ORS285 was able to degrade naringenin, a fraction was converted into an intensely yellow-colored molecule with an m/z (+) of 363.0716. Further analysis indicates that this molecule is a hydroxylated and O-methylated form of naringenin. In contrast to naringenin, this derivative did not induce nod gene expression, but it did stimulate the growth of strain ORS285. We hypothesize that the growth stimulation and metabolic changes induced by naringenin are part of a mechanism to facilitate the colonization and infection of naringenin-exuding host plants.
    Keywords Bradyrhizobium ; electron microscopy ; fatty acid metabolism ; gene expression ; glycerol ; host plants ; hydroxylation ; legumes ; microarray technology ; naringenin ; nodulation ; operon ; phenotype ; Photorhizobium
    Language English
    Dates of publication 2019-11
    Size p. 1517-1525.
    Publishing place Molecular Plant-Microbe Interactions
    Document type Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-05-19-0133-R
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  5. Article: Nod-Factor structure and functional redundancy of nod genes contribute the broad host range Bradyrhizobium sp. DOA9

    Wulandari, Dyah / Songwattana, Pongpan / Gressent, Frederic / Piromyou, Pongdet / Teamtisong, Kamonluck / Boonkerd, Nantakorn / Giraud, Eric / Tittabutr, Panlada / Teaumroong, Neung

    Rhizosphere. 2022 June, v. 22

    2022  

    Abstract: Bradyrhizobium sp. DOA9 has a broad host range and a highly divergent nodulation (nod) gene on the megaplasmid (pDOA9). Duplicated copies of the general regulator nodD (nodD1 and nodD2) and nodA (nodA1 and nodA2) genes were found on pDOA9. The nodA gene ... ...

    Abstract Bradyrhizobium sp. DOA9 has a broad host range and a highly divergent nodulation (nod) gene on the megaplasmid (pDOA9). Duplicated copies of the general regulator nodD (nodD1 and nodD2) and nodA (nodA1 and nodA2) genes were found on pDOA9. The nodA gene is encoding an acyltransferase that controls the transfer of an acyl chain to the chitooligosaccharides (COs) structure and contribute to the determination of host specify. In general, compatible recognition between transcriptional regulators NodD and plant flavonoid inducer able to activate the function of other nodulation (nod) genes which responsible to produce lipo-chitooligosaccharides (LCOs), calls Nod-Factor, a major determinants of host range, infection, and nodulation. In this study, the function of the duplicated nodD (nodD1 and nodD2) and nodA (nodA1 and nodA2) genes were disrupted to determine their role on the symbiotic nodulation. The results showed that the mutation of nodD1 or nodD2 did not affected to the symbiotic nodulation, indicating the functional redundancy of the regulatory nodD1 and nodD2 genes in strain DOA9. Whereas nodA2 and nodB genes plays as a central role in the Nod-Factor biosynthesis and the symbiotic nodulation in all plant tests. Moreover, Nod-Factor produced from DOA9 under genistein induction shared a high similarity with the major Nod-Factor of Rhizobium sp. NGR234. Interestingly, mutation of nodA1 (ΔnodA1) did not affect to the nodulation but lead to induce the production of Nod-Factor belonged to the wild type, with the absence of Nod-Factor bearing the C18:1 acyl group. All these results suggest that the host range of the strain DOA9 might acquire from the functional redundancy of regulatory nodD genes and the Nod-Factor structure.
    Keywords Bradyrhizobium ; Rhizobium ; biosynthesis ; chitooligosaccharides ; genes ; genistein ; host range ; mutation ; nodulation ; plasmids ; rhizosphere ; transcription (genetics)
    Language English
    Dates of publication 2022-06
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 2452-2198
    DOI 10.1016/j.rhisph.2022.100503
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  6. Article: The Modification of the Flavonoid Naringenin by

    Nouwen, Nico / Gargani, Daniel / Giraud, Eric

    Molecular plant-microbe interactions : MPMI

    2019  Volume 32, Issue 11, Page(s) 1517–1525

    Abstract: As inducers of nodulation ( ...

    Abstract As inducers of nodulation (
    MeSH term(s) Bacterial Proteins/metabolism ; Bradyrhizobium/drug effects ; Bradyrhizobium/growth & development ; Bradyrhizobium/metabolism ; Fabaceae ; Flavanones/genetics ; Flavanones/metabolism ; Flavanones/pharmacology ; Flavonoids ; Genes, Bacterial/genetics ; Rhizobium ; Symbiosis/genetics
    Chemical Substances Bacterial Proteins ; Flavanones ; Flavonoids ; naringenin (HN5425SBF2)
    Language English
    Publishing date 2019-09-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-05-19-0133-R
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  7. Article: RibBX of

    Nouwen, Nico / Arrighi, Jean-Francois / Gully, Djamel / Giraud, Eric

    Molecular plant-microbe interactions : MPMI

    2020  Volume 34, Issue 1, Page(s) 88–99

    Abstract: Bradyrhizobium ORS285 forms a nitrogen-fixating symbiosis with both Nod factor (NF)-dependent and NF- ... ...

    Abstract Bradyrhizobium ORS285 forms a nitrogen-fixating symbiosis with both Nod factor (NF)-dependent and NF-independent
    MeSH term(s) Bacterial Proteins/genetics ; Bradyrhizobium/enzymology ; Bradyrhizobium/genetics ; Fabaceae/microbiology ; Intracellular Space/microbiology ; Symbiosis/genetics
    Chemical Substances Bacterial Proteins
    Language English
    Publishing date 2020-11-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-07-20-0209-R
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  8. Article: Symbiose rhizobium/légumineuse: un nouveau sésame.

    Giraud, Eric

    Medecine sciences : M/S

    2007  Volume 23, Issue 6-7, Page(s) 663–664

    Title translation Rhizobium/legume symbiose: a new sesame.
    MeSH term(s) Bradyrhizobium/physiology ; Fabaceae/microbiology ; Fabaceae/physiology ; Rhizobium/physiology ; Symbiosis
    Language French
    Publishing date 2007-06
    Publishing country France
    Document type Journal Article
    ZDB-ID 632733-3
    ISSN 1958-5381 ; 0767-0974
    ISSN (online) 1958-5381
    ISSN 0767-0974
    DOI 10.1051/medsci/20072367663
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  9. Article ; Online: Phylogenetic distribution and evolutionary dynamics of

    Teulet, Albin / Gully, Djamel / Rouy, Zoe / Camuel, Alicia / Koebnik, Ralf / Giraud, Eric / Lassalle, Florent

    Microbial genomics

    2020  Volume 6, Issue 9

    Abstract: ... ...

    Abstract Bradyrhizobium
    MeSH term(s) Bacterial Proteins/genetics ; Bradyrhizobium/classification ; Bradyrhizobium/genetics ; Evolution, Molecular ; Genomics ; Multigene Family ; Peptide Hydrolases/genetics ; Phylogeny ; Symbiosis ; Type III Secretion Systems/genetics
    Chemical Substances Bacterial Proteins ; Type III Secretion Systems ; Peptide Hydrolases (EC 3.4.-)
    Language English
    Publishing date 2020-08-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2835258-0
    ISSN 2057-5858 ; 2057-5858
    ISSN (online) 2057-5858
    ISSN 2057-5858
    DOI 10.1099/mgen.0.000407
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  10. Article ; Online: Exploring the cellular surface polysaccharide and root nodule symbiosis characteristics of the

    Wongdee, Jenjira / Piromyou, Pongdet / Songwattana, Pongpan / Greetatorn, Teerana / Boonkerd, Nantakorn / Teaumroong, Neung / Giraud, Eric / Gully, Djamel / Nouwen, Nico / Kiatponglarp, Worawikunya / Tanthanuch, Waraporn / Tittabutr, Panlada

    Microbiology spectrum

    2023  , Page(s) e0194723

    Abstract: The functional significance ... ...

    Abstract The functional significance of
    Language English
    Publishing date 2023-09-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2807133-5
    ISSN 2165-0497 ; 2165-0497
    ISSN (online) 2165-0497
    ISSN 2165-0497
    DOI 10.1128/spectrum.01947-23
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