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https://www.readbyqxmd.com/read/28346361/specificity-in-legume-rhizobia-symbioses
#1
REVIEW
Mitchell Andrews, Morag E Andrews
Most species in the Leguminosae (legume family) can fix atmospheric nitrogen (N₂) via symbiotic bacteria (rhizobia) in root nodules. Here, the literature on legume-rhizobia symbioses in field soils was reviewed and genotypically characterised rhizobia related to the taxonomy of the legumes from which they were isolated. The Leguminosae was divided into three sub-families, the Caesalpinioideae, Mimosoideae and Papilionoideae. Bradyrhizobium spp. were the exclusive rhizobial symbionts of species in the Caesalpinioideae, but data are limited...
March 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28338684/seven-enzymes-create-extraordinary-molecular-complexity-in-an-uncultivated-bacterium
#2
Michael F Freeman, Maximilian J Helf, Agneya Bhushan, Brandon I Morinaka, Jörn Piel
Uncultivated bacteria represent a massive resource of new enzymes and bioactive metabolites, but such bacteria remain functionally enigmatic. Polytheonamides are potent peptide cytotoxins produced by uncultivated bacteria that exist as symbionts in a marine sponge. Outside glycobiology, polytheonamides represent the most heavily post-translationally modified biomolecules that are derived from amino acids. The biosynthesis of polytheonamides involves up to 50 site-specific modifications to create a membrane-spanning β-helical structure...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28333211/glutathione-affects-the-transport-activity-of-rhizobium-leguminosarum-3841-and-is-essential-for-efficient-nodulation
#3
Guojun Cheng, Ramakrishnan Karunakaran, Alison K East, Olaya Munoz-Azcarate, Philip S Poole
As glutathione (GSH) plays an essential role in growth and symbiotic capacity of rhizobia, a glutathione synthetase (gshB) mutant of Rhizobium leguminosarum biovar viciae 3841 (Rlv3841) was characterised. It fails to efficiently utilise various compounds as a sole carbon source, including glucose, succinate, glutamine and histidine, and shows 60-69% reduction in uptake rates of glucose, succinate and the non-metabolisable substrate α-amino isobutyric acid (AIB). The defect in glucose uptake can be overcome by addition of exogenous GSH, indicating GSH, but not its bacterial synthesis, is required for efficient transport...
February 23, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28330071/unexpected-formation-of-n-phenyl-thiophosphorohydrazidic-acid-o-s-dimethyl-ester-from-acephate-chemical-biotechnical-and-computational-study
#4
Vijay Kumar, Sukhmanpreet Kaur, Simranjeet Singh, Niraj Upadhyay
By the nucleophilic attack of phenylhydrazine on acephate in aqueous medium, a stable product N'-phenyl-thiophosphorohydrazidic acid O,S-dimethyl ester (1) was obtained and characterized by elemental, spectral and thermal analysis. Thermodynamic parameters, Ea, ΔH°, ΔS° and ΔG°, have found to be 62.15, -67.95, -0.068 and -20.05 kJ mol(-1) according to the Coats-Redfern equation. Analysis of interaction of 1 with BSA protein was done by using the UV-Vis and FTIR spectroscopic methods. The observed binding constants was 1...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326071/temporal-variations-in-cigarette-tobacco-bacterial-community-composition-and-tobacco-specific-nitrosamine-content-are-influenced-by-brand-and-storage-conditions
#5
Jessica Chopyk, Suhana Chattopadhyay, Prachi Kulkarni, Eoghan M Smyth, Lauren E Hittle, Joseph N Paulson, Mihai Pop, Stephanie S Buehler, Pamela I Clark, Emmanuel F Mongodin, Amy R Sapkota
Tobacco products, specifically cigarettes, are home to microbial ecosystems that may play an important role in the generation of carcinogenic tobacco-specific nitrosamines (TSNAs), as well as the onset of multiple adverse human health effects associated with the use of these products. Therefore, we conducted time-series experiments with five commercially available brands of cigarettes that were either commercially mentholated, custom-mentholated, user-mentholated, or non-mentholated. To mimic user storage conditions, the cigarettes were incubated for 14 days under three different temperatures and relative humidities (i...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28324236/efficient-de-novo-synthesis-of-resveratrol-by-metabolically-engineered-escherichia-coli
#6
Junjun Wu, Peng Zhou, Xia Zhang, Mingsheng Dong
Resveratrol has been the subject of numerous scientific investigations due to its health-promoting activities against a variety of diseases. However, developing feasible and efficient microbial processes remains challenging owing to the requirement of supplementing expensive phenylpropanoic precursors. Here, various metabolic engineering strategies were developed for efficient de novo biosynthesis of resveratrol. A recombinant malonate assimilation pathway from Rhizobium trifolii was introduced to increase the supply of the key precursor malonyl-CoA and simultaneously, the clustered regularly interspaced short palindromic repeats interference system was explored to down-regulate fatty acid biosynthesis pathway to inactivate the malonyl-CoA consumption pathway...
March 21, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28323446/leguminosae-native-nodulating-bacteria-from-a-gold-mine-as-contaminated-soil-multi-resistance-to-trace-elements-and-possible-role-in-plant-growth-and-mineral-nutrition
#7
Wesley de M Rangel, Silvia M de Oliveira Longatti, Paulo A A Ferreira, Daiane S Bonaldi, Amanda A Guimarães, Sofie Thijs, Nele Weyens, Jaco Vangronsveld, Fatima M S Moreira
Efficient N2-fixing Leguminosae nodulating bacteria resistant to As may facilitate plant growth on As-contaminated sites. In order to identify bacteria possessing these features, 24 strains were isolated from nodules of the trap species Crotalaria spectabilis (12) and Stizolobium aterrimum (12) growing on an As-contaminated gold mine site. 16S rRNA gene sequencing revealed that most of the strains belonged to the group of α-Proteobacteria, being representatives of the genera Bradyrhizobium, Rhizobium, Inquilinus, Labrys, Bosea, Starkeya and Methylobacterium...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28302777/complete-genome-sequences-of-three-rhizobium-gallicum-symbionts-associated-with-common-bean-phaseolus-vulgaris
#8
Patricia Bustos, Rosa Isela Santamaría, Olga María Pérez-Carrascal, José Luis Acosta, Luis Lozano, Soledad Juárez, Irma Martínez-Flores, Esperanza Martínez-Romero, Miguel Ángel Cevallos, David Romero, Guillermo Dávila, Pablo Vinuesa, Fabiola Miranda, Ernesto Ormeño, Víctor González
The whole-genome sequences of three strains of Rhizobium gallicum reported here support the concept that the distinct nodulation host ranges displayed by the symbiovars gallicum and phaseoli can be largely explained by different symbiotic plasmids.
March 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28302768/draft-genome-sequence-of-rhizobium-sp-strain-tbd182-an-antagonist-of-the-plant-pathogenic-fungus-fusarium-oxysporum-isolated-from-a-novel-hydroponics-system-using-organic-fertilizer
#9
Yuichiro Iida, Kazuki Fujiwara, Nobutaka Someya, Makoto Shinohara
Rhizobium sp. strain TBD182, isolated from a novel hydroponics system, is an antagonistic bacterium that inhibits the mycelial growth of Fusarium oxysporum but does not eliminate the pathogen. We report the draft genome sequence of TBD182, which may contribute to elucidation of the molecular mechanisms of its fungistatic activity.
March 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28285657/two-component-regulatory-system-acts-actr-is-required-for-sinorhizobium-meliloti-adaptation-to-oxidative-stress
#10
Guirong Tang, Sunjun Wang, Dawei Lu, Leqi Huang, Ningning Li, Li Luo
The two-component system ActS/ActR plays important roles in bacterial adaptation to abiotic stress, including acid tolerance and oxidant resistance. However, the underlying regulatory mechanism is not clear. In this study, we found that the ActS/ActR system is required for adaptation to oxidative stress by regulating the transcription of the genes actR, katB, gshA and gshB1. The actS and actR mutants were sensitive to low pH and oxidants such as H2O2, oxidized glutathione (GSSG) and sodium nitroprusside (SNP)...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285373/rhizobia-a-potential-biocontrol-agent-for-soilborne-fungal-pathogens
#11
REVIEW
Krishnashis Das, Radha Prasanna, Anil Kumar Saxena
Rhizobia are a group of organisms that are well known for their ability to colonize root surfaces and form symbiotic associations with legume plants. They not only play a major role in biological nitrogen fixation but also improve plant growth and reduce disease incidence in various crops. Rhizobia are known to control the growth of many soilborne plant pathogenic fungi belonging to different genera like Fusarium, Rhizoctonia, Sclerotium, and Macrophomina. Antagonistic activity of rhizobia is mainly attributed to production of antibiotics, hydrocyanic acid (HCN), mycolytic enzymes, and siderophore under iron limiting conditions...
March 12, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28284052/high-yield-production-of-rhizobium-nodb-chitin-deacetylase-and-its-use-for-in%C3%A2-vitro-synthesis-of-lipo-chitinoligosaccharide-precursors
#12
Rémi Chambon, Stéphanie Pradeau, Sébastien Fort, Sylvain Cottaz, Sylvie Armand
Lipo-chitinoligosaccharides (LCOs) are key molecules for the establishment of plant-microorganisms symbiosis. Interactions of leguminous crops with nitrogen-fixing rhizobial bacteria involve Nod factors, while Myc-LCOs improve the association of most plants with arbuscular mycorrhizal fungi. Both Nod factors and Myc-LCOs are composed of a chitinoligosaccharide fatty acylated at the non-reducing end accompanied with various substituting groups. One straightforward way to access LCOs is starting from chitin hydrolysate, an abundant polysaccharide found in crustacean shells, followed by regioselective enzymatic cleavage of an acetyl group from the non-reducing end of chitin tetra- or pentaose, and subsequent chemical introduction of N-acyl group...
February 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28277074/bioremediation-model-for-atrazine-contaminated-agricultural-soils-using-phytoremediation-using-phaseolus-vulgaris-l-and-a-locally-adapted-microbial-consortium
#13
Alfredo Madariaga-Navarrete, Blanca Rosa Rodríguez-Pastrana, José Roberto Villagómez-Ibarra, Otilio Arturo Acevedo-Sandoval, Gregory Perry, Margarita Islas-Pelcastre
The objective of the present study was to examine a biological model under greenhouse conditions for the bioremediation of atrazine contaminated soils. The model consisted in a combination of phytoremediation (using Phaseolus vulgaris L.) and rhizopheric bio-augmentation using native Trichoderma sp., and Rhizobium sp. microorganisms that showed no inhibitory growth at 10,000 mg L(-1) of herbicide concentration. 33.3 mg of atrazine 50 g(-1) of soil of initial concentration was used and an initial inoculation of 1 × 10(9) UFC mL(-1) of Rhizobium sp...
March 3, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28276145/ljmot1-a-high-affinity-molybdate-transporter-from-lotus-japonicus-is-essential-for-molybdate-uptake-but-not-for-the-delivery-to-nodules
#14
Guilan Duan, Tsuneo Hakoyama, Takehiro Kamiya, Hiroki Miwa, Fabien Lombardo, Shusei Sato, Satoshi Tabata, Zheng Chen, Toshihiro Watanabe, Takuro Shinano, Toru Fujiwara
Molybdenum (Mo) is an essential nutrient for plants, and is required for nitrogenase activity of legumes. However, the pathways of Mo uptake from soils and then delivery to the nodules have not been characterized in legumes. In this study, we characterized a high-affinity Mo transporter (LjMOT1) from Lotus japonicus. Mo concentrations in an ethyl methanesulfonate-mutagenized line (ljmot1) decreased by 70-95% compared with wild type (WT). By comparing the DNA sequences of four AtMOT1 homologs between mutant and WT lines, one point mutation was found in LjMOT1, which altered Trp(292) to a stop codon; no mutation was found in the other homologous genes...
March 9, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28255691/the-naringenin-induced-exoproteome-of-rhizobium-etli-ce3
#15
Niurka Meneses, Hermenegildo Taboada, Michael F Dunn, María Del Carmen Vargas, Natasha Buchs, Manfred Heller, Sergio Encarnación
Flavonoids excreted by legume roots induce the expression of symbiotically essential nodulation (nod) genes in rhizobia, as well as that of specific protein export systems. In the bean microsymbiont Rhizobium etli CE3, nod genes are induced by the flavonoid naringenin. In this study, we identified 693 proteins in the exoproteome of strain CE3 grown in minimal medium with or without naringenin, with 101 and 100 exoproteins being exclusive to these conditions, respectively. Four hundred ninety-two (71%) of the extracellular proteins were found in both cultures...
March 2, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28244516/construction-and-simulation-of-the-bradyrhizobium-diazoefficiens-usda110-metabolic-network-a-comparison-between-free-living-and-symbiotic-states
#16
Yi Yang, Xiao-Pan Hu, Bin-Guang Ma
Bradyrhizobium diazoefficiens is a rhizobium able to convert atmospheric nitrogen into ammonium by establishing mutualistic symbiosis with soybean. It has been recognized as an important parent strain for microbial agents and is widely applied in agricultural and environmental fields. In order to study the metabolic properties of symbiotic nitrogen fixation and the differences between a free-living cell and a symbiotic bacteroid, a genome-scale metabolic network of B. diazoefficiens USDA110 was constructed and analyzed...
February 28, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28241097/the-gmfwl1-fw2-2-like-nodulation-gene-encodes-a-plasma-membrane-microdomain-associated-protein
#17
Zhenzhen Qiao, Laurent Brechenmacher, Benjamin Smith, Gregory W Strout, William Mangin, Christopher Taylor, Scott D Russell, Gary Stacey, Marc Libault
The soybean gene GmFWL1 (FW2.2-like1) belongs to a plant-specific family that includes the tomato FW2-2 and the maize CNR1 genes, two regulators of plant development. In soybean, GmFWL1 is specifically expressed in root hair cells in response to rhizobia and in nodules. Silencing of GmFWL1 expression significantly reduced nodule numbers supporting its role during soybean nodulation. While the biological role of GmFWL1 has been described, its molecular function and, more generally, the molecular function of plant FW2...
February 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28229521/microbial-potential-for-carbon-and-nutrient-cycling-in-a-geogenic-supercritical-carbon-dioxide-reservoir
#18
Adam J E Freedman, BoonFei Tan, Janelle R Thompson
Microorganisms catalyze carbon cycling and biogeochemical reactions in the deep subsurface and thus may be expected to influence the fate of injected supercritical (sc) CO2 following geological carbon sequestration (GCS). We hypothesized that natural subsurface scCO2 reservoirs, which serve as analogs for the long-term fate of sequestered scCO2 , harbor a "deep carbonated biosphere" with carbon cycling potential. We sampled subsurface fluids from scCO2 -water separators at a natural scCO2 reservoir at McElmo Dome, Colorado for analysis of 16S rRNA gene diversity and metagenome content...
February 22, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28224000/co-inoculation-effect-of-rhizobia-and-plant-growth-promoting-rhizobacteria-on-common-bean-growth-in-a-low-phosphorus-soil
#19
Hezekiah Korir, Nancy W Mungai, Moses Thuita, Yosef Hamba, Cargele Masso
Nitrogen (N) fixation through legume-Rhizobium symbiosis is important for enhancing agricultural productivity and is therefore of great economic interest. Growing evidence indicates that other soil beneficial bacteria can positively affect symbiotic performance of rhizobia. Nodule endophytic plant growth promoting rhizobacteria (PGPR) were isolated from common bean nodules from Nakuru County in Kenya and characterized 16S rDNA partial gene sequencing. The effect of co-inoculation of rhizobium and PGPR, on nodulation and growth of common bean (Phaseolus vulgaris L...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28214450/in-silico-structural-and-functional-analysis-of-mesorhizobium-acc-deaminase
#20
Krishnendu Pramanik, Tithi Soren, Soumik Mitra, Tushar Kanti Maiti
Nodulation is one of the very important processes of legume plants as it is the initiating event of fixing nitrogen. Although ethylene has essential role in normal plant metabolism but it has also negative impact on plants particularly in nodule formation in legume plants. It is also produced due to a variety of biotic or abiotic stresses. 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase is a rhizobial enzyme which cleaves ACC (immediate precursor of ethylene) into α-ketobutyrate and ammonia. As a result, the level of ethylene from the plant cells is decreased and the negative impact of ethylene on nodule formation is reduced...
February 11, 2017: Computational Biology and Chemistry
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