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https://www.readbyqxmd.com/read/28214450/in-silico-structural-and-functional-analysis-of-mesorhizobium-acc-deaminase
#1
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
https://www.readbyqxmd.com/read/28204472/an-uncharacterized-gene-coding-a-conserved-lytic-transglycosylase-domain-rl4716-is-required-for-proper-cell-envelope-function-in-rhizobium-leguminosarum
#2
Kara D Neudorf, Christopher K Yost
No abstract text is available yet for this article.
February 15, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28194158/role-and-regulation-of-acc-deaminase-gene-in-sinorhizobium-meliloti-is-it-a-symbiotic-rhizospheric-or-endophytic-gene
#3
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/28193496/development-of-a-colorimetric-assay-for-glycosynthases
#4
Marc R Hayes, Kevin Bochinsky, Lisa S Seibt, Lothar Elling, Jörg Pietruszka
The synthesis of glycosidic structures by catalysis via glycosynthases has gained much interest due to the potential high product yields and specificity of the enzymes. Nevertheless, the characterisation and implementation of new glycosynthases is greatly hampered by the lack of high-throughput methods for reaction analysis and screening of potential glycosynthase variants. Fluoride detection, via silyl ether chemosensors, has recently shown high potential for the identification of glycosynthase mutants in a high-throughput manner, though limited by the low maximal detection concentration...
February 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28167938/comparative-analysis-of-the-bacterial-membrane-disruption-effect-of-two-natural-plant-antimicrobial-peptides
#5
Attila Farkas, Gergely Maróti, Attila Kereszt, Éva Kondorosi
In the Medicago truncatula genome about 700 genes code for nodule-specific cysteine-rich (NCR) small peptides that are expressed in the symbiotic organ, the root nodule, where they control terminal differentiation of the endosymbiotic rhizobium bacteria to nitrogen-fixing bacteroids. Cationic NCR peptides were predicted to have antimicrobial activities. Here antibacterial activities of NCR247, NCR335, polymyxin B (PMB), and streptomycin were investigated and compared on two foodborne pathogens Salmonella enterica and Listeria monocytogenes as representatives of Gram-negative and Gram-positive bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28165756/enhanced-phytoremediation-of-soils-contaminated-with-pahs-by-arbuscular-mycorrhiza-and-rhizobium
#6
Cheng-Gang Ren, Cun-Cui Kong, Bian Bian, Wei Liu, Yan Li, Yong-Ming Luo, Xie Zhi-Hong
Greenhouse experiment was conducted to evaluate the potential effectiveness of a legume (Sesbania cannabina), arbuscular mycorrhizal fungi (AMF) (Glomus mosseae) and rhizobia (Ensifer sp.) symbiosis for remediation of PAHs in spiked soil. AMF and rhizobia had a beneficial impact on each other in the triple symbiosis. AMF and/or rhizobia significantly increased plant biomass and PAHs accumulation in plants. The highest PAHs dissipation was observed in plant + AMF + rhizobia treated soil, in which >97 and 85-87% of phenanthrene and pyrene, respectively, had been degraded, whereas 81-85% and 72-75% had been degraded in plant-treated soil...
February 6, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28163823/draft-genome-sequence-of-type-strain-hbr26-t-and-description-of-rhizobium-aethiopicum-sp-nov
#7
Aregu Amsalu Aserse, Tanja Woyke, Nikos C Kyrpides, William B Whitman, Kristina Lindström
Rhizobium aethiopicum sp. nov. is a newly proposed species within the genus Rhizobium. This species includes six rhizobial strains; which were isolated from root nodules of the legume plant Phaseolus vulgaris growing in soils of Ethiopia. The species fixes nitrogen effectively in symbiosis with the host plant P. vulgaris, and is composed of aerobic, Gram-negative staining, rod-shaped bacteria. The genome of type strain HBR26(T) of R. aethiopicum sp. nov. was one of the rhizobial genomes sequenced as a part of the DOE JGI 2014 Genomic Encyclopedia project designed for soil and plant-associated and newly described type strains...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28160315/solution-nmr-structure-of-rhe_ch02687-from-rhizobium-etli-a-novel-flavonoid-binding-protein
#8
Chunjie Liang, Jiang Zhu, Rui Hu, Theresa A Ramelot, Michael A Kennedy, Maili Liu, Yunhuang Yang
We report the solution NMR structure of RHE_CH02687 from Rhizobium etli. Its structure consists of two β-sheets that together with two short and one long α-helix form a hydrophobic cavity. This protein shows a high structural similarity to the prokaryotic protein YndB from Bacillus subtilis, and the eukaryotic protein Aha1. NMR titration experiments confirmed that RHE_CH02687, like its homolog YndB, interacted with flavonoids, giving support for a biological function as a flavonoid sensor in the symbiotic interaction between R...
February 3, 2017: Proteins
https://www.readbyqxmd.com/read/28154946/rhizobium-rhizosphaerae-sp-nov-a-novel-species-isolated-from-rice-rhizosphere
#9
Juan-Juan Zhao, Jun Zhang, Rui-Jie Zhang, Cai-Wen Zhang, Hua-Qun Yin, Xiao-Xia Zhang
Two novel, Gram-negative, motile, rod-shaped, aerobic bacterial strains, MH17(T) and RD15, were isolated from the sterilized root and rhizosphere soil of rice, respectively. Phylogenetic analysis based on 16S rRNA gene sequences showed that the similarity between strains MH17(T) and RD15 was 100%. The isolates exhibit high sequence similarities to Rhizobium oryzae CGMCC 1.7048(T) (98.7%) and Rhizobium petrolearium SL-1(T) (97.0% and 97.1%), which supports that they belong to a novel species in the genus Rhizobium...
February 2, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28142283/the-role-of-plant-innate-immunity-in-the-legume-rhizobium-symbiosis
#10
Yangrong Cao, Morgan K Halane, Walter Gassmann, Gary Stacey
A classic view of the evolution of mutualism is that it derives from a pathogenic relationship that attenuated over time to a situation in which both partners can benefit. If this is the case for rhizobia, then one might uncover features of the symbiosis that reflect this earlier pathogenic state. For example, as with plant pathogens, it is now generally assumed that rhizobia actively suppress the host immune response to allow infection and symbiosis establishment. Likewise, the host has retained mechanisms to control the nutrient supply to the symbionts and the number of nodules so that they do not become too burdensome...
January 30, 2017: Annual Review of Plant Biology
https://www.readbyqxmd.com/read/28126941/genome-sequence-of-the-symbiotic-type-strain-rhizobium-tibeticum-ccbau85039t
#11
Gonzalo Torres Tejerizo, Daniel Wibberg, Anika Winkler, Ernesto Ormeño-Orrillo, Esperanza Martínez-Romero, Karsten Niehaus, Alfred Pühler, Jörn Kalinowski, Antonio Lagares, Andreas Schlüter, Mariano Pistorio
Rhizobium tibeticum was originally isolated from root nodules of Trigonella archiducis-nicolai grown in Tibet, China. This species is also able to nodulate Medicago sativa and Phaseolus vulgaris The whole-genome sequence of the type strain, R. tibeticum CCBAU85039(T), is reported in this study.
January 26, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28126039/rhizobium-arenae-sp-nov-isolated-from-the-sand-of-desert-mu-us-china
#12
Shengnan Zhang, Shanshan Yang, Wei Chen, Yong Chen, Mingjuan Zhang, Xinai Zhou, Guohua Fan, Fu Ying Feng
A Gram-strain-negative, rod-shaped, motile bacterium, designated MIM27T, was isolated from the sand of Desert Mu Us, China. The strain could grow at 4-45 °C (optimum, 37 °C), at pH 6.5-9.0 (optimum, 8.0) and in the presence of 0-3 % (w/v) NaCl (optimum, 0 %). Phylogenetic analysis on 16S rRNA gene sequence demonstrated that the strain was belonged to the genus Rhizobium, with the highest similarity (96.5 %) to Rhizobium pakistanensis BN-19T. Analysis of nitrogen fixation gene nifH and three housekeeping gene sequences of recA, atpD and glnII were also showed that strain MIM27T was mostly related to the recognized species of the genus Rhizobium but the similarities were low ( 90...
January 23, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28116041/high-quality-draft-genome-sequence-of-rhizobium-mesoamericanum-strain-stm6155-a-mimosa-pudica-microsymbiont-from-new-caledonia
#13
Agnieszka Klonowska, Aline López-López, Lionel Moulin, Julie Ardley, Margaret Gollagher, Dora Marinova, Rui Tian, Marcel Huntemann, T B K Reddy, Neha Varghese, Tanja Woyke, Victor Markowitz, Natalia Ivanova, Rekha Seshadri, Mohamed N Baeshen, Nabih A Baeshen, Nikos Kyrpides, Wayne Reeve
Rhizobium mesoamericanum STM6155 (INSCD = ATYY01000000) is an aerobic, motile, Gram-negative, non-spore-forming rod that can exist as a soil saprophyte or as an effective nitrogen fixing microsymbiont of the legume Mimosa pudica L.. STM6155 was isolated in 2009 from a nodule of the trap host M. pudica grown in nickel-rich soil collected near Mont Dore, New Caledonia. R. mesoamericanum STM6155 was selected as part of the DOE Joint Genome Institute 2010 Genomic Encyclopedia for Bacteria and Archaea-Root Nodule Bacteria (GEBA-RNB) genome sequencing project...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28115905/genetic-diversity-and-symbiotic-efficiency-of-indigenous-common-bean-rhizobia-in-croatia
#14
Ines Pohajda, Katarina Huić Babić, Ivana Rajnović, Sanja Kajić, Sanja Sikora
Nodule bacteria (rhizobia) in symbiotic associations with legumes enable considerable entries of biologically fixed nitrogen into soil. Efforts are therefore made to intensify the natural process of symbiotic nitrogen fixation by legume inoculation. Studies of field populations of rhizobia open up the possibility to preserve and probably exploit some indigenous strains with hidden symbiotic or ecological potentials. The main aim of the present study is to determine genetic diversity of common bean rhizobia isolated from different field sites in central Croatia and to evaluate their symbiotic efficiency and compatibility with host plants...
December 2016: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/28098343/mn-accumulation-in-a-submerged-plant-egeria-densa-hydrocharitaceae-is-mediated-by-epiphytic-bacteria
#15
Kousuke Tsuji, Takuma Asayama, Nozomi Shiraki, Shota Inoue, Erina Okuda, Chizuru Hayashi, Kazuma Nishida, Hiroshi Hasegawa, Emiko Harada
Many aquatic plants act as biosorbents, removing and recovering metals from the environment. To assess the biosorbent activity of Egeria densa, a submerged freshwater macrophyte, plants were collected monthly from a circular drainage area in Lake Biwa basin and the Mn concentrations of the plants were analyzed. Mn concentrations in these plants were generally above those of terrestrial hyperaccumulators, and were markedly higher in spring and summer than in autumn. Mn concentrations were much lower in plants incubated in hydroponic medium at various pH levels with and without Mn supplementation than in field-collected plants...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28097539/rhizobium-hedysari-sp-nov-a-novel-species-isolated-from-a-root-nodule-of-hedysarum-multijugum-in-china
#16
Lin Xu, Jianfeng Shi, Caixia Li, Shengan Zhu, Bo Li
A strain 5-1-2(T) was isolated from a root nodule of Hedysarum multijugum collected from Zhangye city, Gansu province, north-west China. Phylogenetic analysis based on the 16S rRNA gene sequence and other housekeeping genes (recA and atpD) indicated that the strain represents a novel species in the genus Rhizobium close to the strain Rhizobium subbaraonis JC85(T) with similarities of 98.27, 88.92 and 89.62%, respectively. Strain 5-1-2(T) contained Q-10 as the predominant ubiquinone. Our results showed that the major fatty acids were feature 8 (C18:1 ω7c and/or C18:1 ω6c; 38...
January 17, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28097405/role-of-exopolysaccharide-in-salt-stress-resistance-and-cell-motility-of-mesorhizobium-alhagi-ccnwxj12-2-t
#17
Xiaodong Liu, Yantao Luo, Zhefei Li, Jiamei Wang, Gehong Wei
Mesorhizobium alhagi, a legume-symbiont soil bacterium that forms nodules with the desert plant Alhagi sparsifolia, can produce large amounts of exopolysaccharide (EPS) using mannitol as carbon source. However, the role of EPS in M. alhagi CCNWXJ12-2(T), an EPS-producing rhizobium with high salt resistance, remains uncharacterized. Here, we studied the role of EPS in M. alhagi CCNWXJ12-2(T) using EPS-deficient mutants constructed by transposon mutagenesis. The insertion sites of six EPS-deficient mutants were analyzed using single primer PCR, and two putative gene clusters were found to be involved in EPS synthesis...
January 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28092137/isolation-and-characterization-of-rhizobium-sp-strain-ys-1r-that-degrades-lignin-in-plant-biomass
#18
Colin A Jackson, Matthew B Couger, Madhu Prabhakaran, Karthikeyan D Ramachandriya, Patricia Canaan, Babu Z Fathepure
AIMS: The aim of this work was to isolate novel lignin degrading organisms. METHODS AND RESULTS: Several pure cultures of bacteria that degrade lignin were isolated from bacterial consortia developed from decaying biomass. Among the isolates, Rhizobium sp. strain YS-1r (closest relative of Rhizobium petrolearium Strain SL-1) was explored for its lignin degrading ability. Microcosm studies showed that strain YS-1r was able to degrade a variety of lignin monomers, dimers, and also native lignin in switchgrass and alfalfa...
January 16, 2017: Journal of Applied Microbiology
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
#19
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/28074430/the-monomeric-gtpase-raba2-is-required-for-progression-and-maintenance-of-membrane-integrity-of-infection-threads-during-root-nodule-symbiosis
#20
Virginia Dalla Via, Soledad Traubenik, Claudio Rivero, O Mario Aguilar, María Eugenia Zanetti, Flavio Antonio Blanco
Progression of the infection canal that conducts rhizobia to the nodule primordium requires a functional Rab GTPase located in Golgi/trans-Golgi that also participate in root hair polar growth. Common bean (Phaseolus vulgaris) symbiotically associates with its partner Rhizobium etli, resulting in the formation of root nitrogen-fixing nodules. Compatible bacteria can reach cortical cells in a tightly regulated infection process, in which the specific recognition of signal molecules is a key step to select the symbiotic partner...
January 10, 2017: Plant Molecular Biology
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