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https://www.readbyqxmd.com/read/28197647/the-overproduction-of-indole-3-acetic-acid-iaa-in-endophytes-upregulates-nitrogen-fixation-in-both-bacterial-cultures-and-inoculated-rice-plants
#1
Roberto Defez, Anna Andreozzi, Carmen Bianco
Endophytic bacteria from roots and leaves of rice plants were isolated and identified in order to select the diazotrophs and improve their nitrogen-fixing abilities. The nitrogen-fixing endophytes were identified by PCR amplification of the nifH gene fragment. For this purpose, two isolates, Enterobacter cloacae RCA25 and Klebsiella variicola RCA26, and two model bacteria (Herbaspirillum seropedicae z67 and Sinorhizobium fredii NGR234) were transformed to increase the biosynthesis of the main plant auxin indole-3-acetic acid (IAA)...
February 14, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28194158/role-and-regulation-of-acc-deaminase-gene-in-sinorhizobium-meliloti-is-it-a-symbiotic-rhizospheric-or-endophytic-gene
#2
Alice Checcucci, Elisa Azzarello, Marco Bazzicalupo, Anna De Carlo, Giovanni Emiliani, Stefano Mancuso, Giulia Spini, Carlo Viti, Alessio Mengoni
Plant-associated bacteria exhibit a number of different strategies and specific genes allow bacteria to communicate and metabolically interact with plant tissues. Among the genes found in the genomes of plant-associated bacteria, the gene encoding the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase (acdS) is one of the most diffused. This gene is supposed to be involved in the cleaving of plant-produced ACC, the precursor of the plant stress-hormone ethylene toning down the plant response to infection...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28180335/sinorhizobium-meliloti-ybey-is-an-endoribonuclease-with-unprecedented-catalytic-features-acting-as-silencing-enzyme-in-riboregulation
#3
Margarida Saramago, Alexandra Peregrina, Marta Robledo, Rute G Matos, Rolf Hilker, Javier Serrania, Anke Becker, Cecilia M Arraiano, José I Jiménez-Zurdo
No abstract text is available yet for this article.
February 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28167519/regulation-of-polyhydroxybutyrate-accumulation-in-sinorhizobium-meliloti-by-the-trans-encoded-small-rna-mmgr
#4
Antonio Lagares, Germán Ceizel Borella, Uwe Linne, Anke Becker, Claudio Valverde
Riboregulation has a major role in the fine-tuning of multiple bacterial processes. Among the RNA players, trans-encoded untranslated small RNAs (sRNAs) regulate complex metabolic networks by tuning expression from multiple target genes in response to numerous signals. In Sinorhizobium meliloti, over 400 sRNAs are expressed under different stimuli. The sRNA MmgR-standing for Makes more granules Regulator-has been of particular interest to us since its sequence and structure are highly conserved among the α-proteobacteria, and its expression is regulated by the amount and quality of the bacterium's available nitrogen source...
February 6, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28141492/rnase-e-and-rnase-j-are-needed-for-s-adenosylmethionine-homeostasis-in-sinorhizobium-meliloti
#5
Kathrin Baumgardt, Hendrik Melior, Ramakanth Madhugiri, Sebastian Thalmann, Adam Schikora, Matthew McIntosh, Anke Becker, Elena Evguenieva-Hackenberg
The ribonucleases (RNases) E and J play major roles in Escherichia coli and Bacillus subtilis, respectively, and co-exist in Sinorhizobium meliloti. We analyzed S. meliloti 2011 mutants with mini-Tn5 insertions in the corresponding genes rne and rnj and found many overlapping effects. We observed similar changes in mRNA levels including lower mRNA levels of the motility and chemotaxis related genes flaA, flgB, and cheR and higher levels of ndvA (important for glucan export). The acyl-homoserine lactone (AHL) levels were also higher during exponential growth in both RNase mutants, despite no increase in the expression of the sinI AHL synthase gene...
January 28, 2017: Microbiology
https://www.readbyqxmd.com/read/28138345/genomic-characterization-of-eight-ensifer-strains-isolated-from-pristine-caves-and-a-whole-genome-phylogeny-of-ensifer-sinorhizobium
#6
Heerman Kumar Sandra Kumar, Han Ming Gan, Mun Hua Tan, Wilhelm Wei Han Eng, Hazel A Barton, André O Hudson, Michael A Savka
A total of eight Ensifer sp. strains were isolated from two pristine cave environments. One strain was isolated from a cave water pool located in the Wind Cave National Park, South Dakota, USA and the remaining seven strains were isolated from Lechuguilla Cave of Carlsbad Caverns National Park, New Mexico, USA. Whole genome sequencing and comparative genomic analyses of the eight isolates compared to various type strains from the genera Ensifer and Sinorhizobium demonstrates that although members in these genera can be phylogenetically separated into two distinct clades, the percentage of conserved proteins (POCP) between various type strains from Ensifer and Sinorhizobium are consistently higher than 50%, providing strong genomic evidence to support the classification of the genera Ensifer and Sinorhizobium into a single genus...
2017: Journal of Genomics
https://www.readbyqxmd.com/read/28088165/genomic-characterization-of-ensifer-aridi-a-proposed-new-species-of-nitrogen-fixing-rhizobium-recovered-from-asian-african-and-american-deserts
#7
Antoine Le Quéré, Nisha Tak, Hukam Singh Gehlot, Celine Lavire, Thibault Meyer, David Chapulliot, Sonam Rathi, Ilham Sakrouhi, Guadalupe Rocha, Marine Rohmer, Dany Severac, Abdelkarim Filali-Maltouf, Jose-Antonio Munive
BACKGROUND: Nitrogen fixing bacteria isolated from hot arid areas in Asia, Africa and America but from diverse leguminous plants have been recently identified as belonging to a possible new species of Ensifer (Sinorhizobium). In this study, 6 strains belonging to this new clade were compared with Ensifer species at the genome-wide level. Their capacities to utilize various carbon sources and to establish a symbiotic interaction with several leguminous plants were examined. RESULTS: Draft genomes of selected strains isolated from Morocco (Merzouga desert), Mexico (Baja California) as well as from India (Thar desert) were produced...
January 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28058638/functional-analysis-of-the-two-cyclophilin-isoforms-of-sinorhizobium-meliloti
#8
Eirini-Evangelia Thomloudi, Aggeliki Skagia, Anastasia Venieraki, Panagiotis Katinakis, Maria Dimou
The nitrogen fixing Sinorhizobium meliloti possesses two genes, ppiA and ppiB, encoding two cyclophilin isoforms which belong to the superfamily of peptidyl prolyl cis/trans isomerases (PPIase, EC: 5.2.1.8). Here, we functionally characterize the two proteins and we demonstrate that both recombinant cyclophilins are able to isomerise the Suc-AAPF-pNA synthetic peptide but neither of them displays chaperone function in the citrate synthase thermal aggregation assay. Furthermore, we observe that the expression of both enzymes increases the viability of E...
February 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28017611/regulation-of-differentiation-of-nitrogen-fixing-bacteria-by-microsymbiont-targeting-of-plant-thioredoxin-s1
#9
Carolina Werner Ribeiro, Fabien Baldacci-Cresp, Olivier Pierre, Marie Larousse, Sofiane Benyamina, Annie Lambert, Julie Hopkins, Claude Castella, Julie Cazareth, Geneviève Alloing, Eric Boncompagni, Jérémy Couturier, Peter Mergaert, Pascal Gamas, Nicolas Rouhier, Françoise Montrichard, Pierre Frendo
Legumes associate with rhizobia to form nitrogen (N2)-fixing nodules, which is important for plant fitness [1, 2]. Medicago truncatula controls the terminal differentiation of Sinorhizobium meliloti into N2-fixing bacteroids by producing defensin-like nodule-specific cysteine-rich peptides (NCRs) [3, 4]. The redox state of NCRs influences some biological activities in free-living bacteria, but the relevance of redox regulation of NCRs in planta is unknown [5, 6], although redox regulation plays a crucial role in symbiotic nitrogen fixation [7, 8]...
January 23, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28007516/using-transposition-to-introduce-egfp-fusions-in-sinorhizobium-meliloti-a-tool-to-analyze-protein-localization-patterns-in-bacteria
#10
Hanna Bednarz, Karsten Niehaus
Conventional methods used for the in vivo analysis of subcellular protein localizations and their spatio-temporal dynamics in prokaryotes are based on either the engineering of N(amino)- or C(carboxy)-terminal fusions of fluorescent proteins with the protein of interest, or involved probing internal sites for tag integration. In addition, the use of inducible or constitutive promoters for the expression of fluorescent fusion proteins can lead to overexpression and result in localization artifacts. Here, we describe a method for the synthesis of fluorescent fusion proteins using transposable elements, which can randomly integrate in the internal sections of the protein coding sequence to produce full-length fluorescent fusion proteins expressed at endogenous levels...
December 19, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27986730/the-sinorhizobium-ensifer-fredii-hh103-nodulation-outer-protein-nopi-is-a-determinant-for-efficient-nodulation-of-soybean-and-cowpea
#11
Irene Jiménez-Guerrero, Francisco Pérez-Montaño, Carlos Medina, Francisco Javier Ollero, Francisco Javier López-Baena
: The type 3 secretion system (T3SS) is a specialized secretion apparatus commonly used by many plant and animal pathogenic bacteria to deliver proteins, termed effectors, to the interior of the host cells. These effectors suppress host defenses and interfere with signal transduction pathways to promote infection. Some rhizobial strains possess a functional T3SS, which is involved in the suppression of host defense responses, host-range determination and symbiotic efficiency. The analysis of the genome of the broad host-range rhizobial strain Sinorhizobium fredii HH103 identified eight genes that code for putative T3SS effectors...
December 16, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27965651/interaction-between-nitrogen-and-phosphate-stress-responses-in-sinorhizobium-meliloti
#12
Kelly L Hagberg, Svetlana N Yurgel, Monika Mulder, Michael L Kahn
Bacteria have developed various stress response pathways to improve their assimilation and allocation of limited nutrients, such as nitrogen and phosphate. While both the nitrogen stress response (NSR) and phosphate stress response (PSR) have been studied individually, there are few experiments reported that characterize effects of multiple stresses on one or more pathways in Sinorhizobium meliloti, a facultatively symbiotic, nitrogen-fixing bacteria. The PII proteins, GlnB and GlnK, regulate the NSR activity, but analysis of global transcription changes in a PII deficient mutant suggest that the S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27923992/sinorhizobium-meliloti-ybey-is-an-endoribonuclease-with-unprecedented-catalytic-features-acting-as-silencing-enzyme-in-riboregulation
#13
Margarida Saramago, Alexandra Peregrina, Marta Robledo, Rute G Matos, Rolf Hilker, Javier Serrania, Anke Becker, Cecilia M Arraiano, José I Jiménez-Zurdo
Structural and biochemical features suggest that the almost ubiquitous bacterial YbeY protein may serve catalytic and/or Hfq-like protective functions central to small RNA (sRNA)-mediated regulation and RNA metabolism. We have biochemically and genetically characterized the YbeY ortholog of the legume symbiont Sinorhizobium meliloti (SmYbeY). Co-immunoprecipitation (CoIP) with a FLAG-tagged SmYbeY yielded a poor enrichment in RNA species, compared to Hfq CoIP-RNA uncovered previously by a similar experimental setup...
December 6, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27918247/type-iv-effector-proteins-involved-in-the-medicago-sinorhizobium-symbiosis
#14
Matthew S Nelson, Chan Lan Chun, Michael J Sadowsky
In this study, we investigated genetic elements of the type IV secretion system (T4SS) found in Sinorhizobium spp. and the role they play in symbiosis. Sinorhizobium meliloti and S. medicae each contain a putative T4SS similar to that used by Agrobacterium tumefaciens during pathogenesis. The Cre reporter assay for translocation system was used to validate potential effector proteins. Both S. meliloti and S. medicae contained the effector protein TfeA, which was translocated into the host plant. Sequence analysis revealed the presence of a nod box involved in transcriptional activation of symbiosis-related genes, upstream of the transcriptional regulator (virG) in the Sinorhizobium T4SS...
January 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27917168/the-absence-of-the-n-acyl-homoserine-lactone-autoinducer-synthase-genes-trai-and-ngri-increases-the-copy-number-of-the-symbiotic-plasmid-in-sinorhizobium-fredii-ngr234
#15
Jessica Grote, Dagmar Krysciak, Katrin Petersen, Simon Güllert, Christel Schmeisser, Konrad U Förstner, Hari B Krishnan, Harald Schwalbe, Nina Kubatova, Wolfgang R Streit
Plant-released flavonoids induce the transcription of symbiotic genes in rhizobia and one of the first bacterial responses is the synthesis of so called Nod factors. They are responsible for the initial root hair curling during onset of root nodule development. This signal exchange is believed to be essential for initiating the plant symbiosis with rhizobia affiliated with the Alphaproteobacteria. Here, we provide evidence that in the broad host range strain Sinorhizobium fredii NGR234 the complete lack of quorum sensing molecules results in an elevated copy number of its symbiotic plasmid (pNGR234a)...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27911408/defining-substrate-specificities-for-lipase-and-phospholipase-candidates
#16
Diana X Sahonero-Canavesi, Maritza Zavaleta-Pastor, Lourdes Martínez-Aguilar, Isabel M López-Lara, Otto Geiger
Microorganisms produce a wide spectrum of (phospho)lipases that are secreted in order to make external substrates available for the organism. Alternatively, other (phospho)lipases may be physically associated with the producing organism causing a turnover of intrinsic lipids and frequently giving rise to a remodeling of the cellular membranes. Although potential (phospho)lipases can be predicted with a number of algorithms when the gene/protein sequence is available, experimental proof of the enzyme activities, substrate specificities, and potential physiological functions has frequently not been obtained...
November 23, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27902438/dna-double-strand-break-repair-is-involved-in-desiccation-resistance-of-sinorhizobium-meliloti-but-is-not-essential-for-its-symbiotic-interaction-with-medicago-truncatula
#17
Pierre Dupuy, Benjamin Gourion, Laurent Sauviac, Claude Bruand
The soil bacterium Sinorhizobium meliloti, a nitrogen-fixing symbiont of legume plants, is exposed to numerous stress conditions in nature, some of which cause the formation of harmful DNA double strand breaks (DSB). In particular, the reactive oxygen (ROS) and nitrogen (RNS) species produced during symbiosis, and the desiccation occurring in dry soils, are conditions which induce DSB. Two major systems of DSB repair are known in S. meliloti: homologous recombination (HR) and non-homologous end-joining (NHEJ)...
November 23, 2016: Microbiology
https://www.readbyqxmd.com/read/27900694/methods-for-the-isolation-of-genes-encoding-novel-pha-metabolism-enzymes-from-complex-microbial-communities
#18
Jiujun Cheng, Ricardo Nordeste, Maria A Trainer, Trevor C Charles
Development of different PHAs as alternatives to petrochemically derived plastics can be facilitated by mining metagenomic libraries for diverse PHA cycle genes that might be useful for synthesis of bio-plastics. The specific phenotypes associated with mutations of the PHA synthesis pathway genes in Sinorhizobium meliloti and Pseudomonas putida, allows the use of powerful selection and screening tools to identify complementing novel PHA synthesis genes. Identification of novel genes through their function rather than sequence facilitates the functional proteins that may otherwise have been excluded through sequence-only screening methodology...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27827003/sinorhizobium-fredii-hh103-invades-lotus-burttii-by-crack-entry-in-a-nod-factor-and-surface-polysaccharide-dependent-manner
#19
Sebastián Acosta-Jurado, Dulce-Nombre Rodríguez-Navarro, Yasuyuki Kawaharada, Juan Fernández Perea, Antonio Gil-Serrano, Haojie Jin, Qi An, Miguel A Rodríguez-Carvajal, Stig U Andersen, Niels Sandal, Jens Stougaard, José-María Vinardell, José E Ruiz-Sainz
Sinorhizobium fredii HH103-Rif(r), a broad host range rhizobial strain, induces nitrogen-fixing nodules in Lotus burttii but ineffective nodules in L. japonicus. Confocal microscopy studies showed that Mesorhizobium loti MAFF303099 and S. fredii HH103-Rif(r) invade L. burttii roots through infection threads or epidermal cracks, respectively. Infection threads in root hairs were not observed in L. burttii plants inoculated with S. fredii HH103-Rif(r). A S. fredii HH103-Rif(r) nodA mutant failed to nodulate L...
December 2016: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27818838/optical-disassembly-of-cellular-clusters-by-tunable-tug-of-war-tweezers
#20
Anna S Bezryadina, Daryl C Preece, Joseph C Chen, Zhigang Chen
Bacterial biofilms underlie many persistent infections, posing major hurdles in antibiotic treatment. Here we design and demonstrate 'tug-of-war' optical tweezers that can facilitate the assessment of cell-cell adhesion-a key contributing factor to biofilm development, thanks to the combined actions of optical scattering and gradient forces. With a customized optical landscape distinct from that of conventional tweezers, not only can such 'tug-of-war' tweezers stably trap and stretch a rod-shaped bacterium in the observing plane, but, more importantly, they can also impose a tunable lateral force that pulls apart cellular clusters without any tethering or mechanical movement...
2016: Light, Science & Applications
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