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https://www.readbyqxmd.com/read/28694295/in-vivo-analysis-of-the-viable-microbiota-and-helicobacter-pylori-transcriptome-in-gastric-infection-and-early-stages-of-carcinogenesis
#1
Kaisa Thorell, Johan Bengtsson-Palme, Oscar Hsin-Fu Liu, Reyna Victoria Palacios Gonzales, Intawat Nookaew, Linda Rabeneck, Lawrence Paszat, David Y Graham, Jens Nielsen, Samuel B Lundin, Åsa Sjöling
Emerging evidence shows that the human microbiota plays a larger role in disease progression and health than previously anticipated. Helicobacter pylori, the causative agent of gastric cancer and duodenal and gastric ulcers, was early associated with gastric disease, but it has also been proposed that the accompanying microbiota in Helicobacter pylori-infected individuals might affect disease progression and gastric cancer development. In this study, the composition of the transcriptionally active microbial community and the H...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28665587/organohalide-respiration-with-chlorinated-ethenes-under-low-ph-conditions
#2
Yi Yang, Natalie L Cápiro, Tyler F Marcet, Jun Yan, Kurt D Pennell, Frank E Löffler
Bioremediation at chlorinated solvent sites often leads to groundwater acidification due to electron donor fermentation and enhanced dechlorination activity. The microbial reductive dechlorination process is robust at circumneutral pH, but activity declines at groundwater pH values below 6.0. Consistent with this observation, the activity of tetrachloroethene (PCE) dechlorinating cultures declined at pH 6.0 and was not sustained in pH 5.5 medium, with one notable exception. Sulfurospirillum multivorans dechlorinated PCE to cis-1,2-dichloroethene (cDCE) in pH 5...
July 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28648395/the-complete-genome-of-the-tetrachloroethene-respiring-epsilonproteobacterium-sulfurospirillum-halorespirans
#3
Tobias Goris, Benjamin Schenz, Johannes Zimmermann, Mikael Lemos, Jörg Hackermüller, Torsten Schubert, Gabriele Diekert
Sulfurospirillum halorespirans is a bacterium that couples the reductive dehalogenation of chlorinated ethenes to growth. This process is called organohalide respiration (OHR), which can be of importance for bioremediation. Here, we report the complete genome of S. halorespirans, the second one of an organohalide-respiring Epsilonproteobacterium after that of Sulfurospirillum multivorans. With both genomes at hand, we were able to ascertain that the genomic region encoding OHR proteins in Epsilonproteobacteria differs from that found in organohalide-respiring bacteria (OHRB) affiliated to other phyla and that the production of a unique cobamide, norpseudo-B12, might not be limited to the model organism S...
June 22, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28397170/the-organohalide-respiring-bacterium-sulfurospirillum-multivorans-a-natural-source-for-unusual-cobamides
#4
REVIEW
Torsten Schubert
Cobamides ('complete' corrinoids) are essential for organohalide-respiring bacteria because they act as cofactors of reductive dehalogenases (RDases). RDases are the key enzymes in organohalide respiration, a process relevant for environmental remediation. More than a decade ago, the unusual norpseudo-B12 was identified as cofactor of the tetrachloroethene RDase (PceA) purified from the epsilonproteobacterium Sulfurospirillum multivorans. Since then, the question was raised whether or not the production of the uncommon cobamide is a specific adaptation to the requirements of PceA...
May 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28373866/the-nife-hydrogenases-of-the-tetrachloroethene-respiring-epsilonproteobacterium-sulfurospirillum-multivorans-biochemical-studies-and-transcription-analysis
#5
Stefan Kruse, Tobias Goris, Maria Wolf, Xi Wei, Gabriele Diekert
The organohalide-respiring Epsilonproteobacterium Sulfurospirillum multivorans is able to grow with hydrogen as electron donor and with tetrachloroethene (PCE) as electron acceptor; PCE is reductively dechlorinated to cis-1,2-dichloroethene. Recently, a genomic survey revealed the presence of four gene clusters encoding NiFe hydrogenases in its genome, one of which is presumably periplasmic and membrane-bound (MBH), whereas the remaining three are cytoplasmic. To explore the role and regulation of the four hydrogenases, quantitative real-time PCR and biochemical studies were performed with S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28229521/microbial-potential-for-carbon-and-nutrient-cycling-in-a-geogenic-supercritical-carbon-dioxide-reservoir
#6
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...
June 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28213734/dehalococcoides-and-general-bacterial-ecology-of-differentially-trichloroethene-dechlorinating-flow-through-columns
#7
Babur S Mirza, Darwin L Sorensen, Daniel J McGlinn, R Ryan Dupont, Joan E McLean
The diversity of Dehalococcoides mccartyi (Dhc) and/or other organohalide respiring or associated microorganisms in parallel, partial, or complete trichloroethene (TCE) dehalogenating systems has not been well described. The composition of Dhc populations and the associated bacterial community that developed over 7.5 years in the top layer (0-10 cm) of eight TCE-fed columns were examined using pyrosequencing. Columns biostimulated with one of three carbon sources, along with non-stimulated controls, developed into complete (ethene production, whey amended), partial (cis-dichloroethene (DCE) and VC, an emulsified oil with nonionic surfactant), limited (<5 % cis-DCE and 95 % TCE, an emulsified oil), and non- (controls) TCE dehalogenating systems...
February 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28120312/nitrogen-fixing-bacterial-diversity-in-a-tropical-estuarine-sediments
#8
Jabir Thajudeen, Jesmi Yousuf, Vipindas Puthiya Veetil, Sherin Varghese, Arvind Singh, Mohamed Hatha Abdulla
Microorganisms play a significant role in biogeochemical cycles, especially in the benthic and pelagic ecosystems. Role of environmental parameters in regulating the diversity, distribution and physiology of these microorganisms in tropical marine environment is not well understood. In this study, we have identified dinitrogen (N2) fixing bacterial communities in the sediments by constructing clone libraries of nitrogenase (nifH) gene from four different stations in the Cochin estuary, along the southeastern Arabian Sea...
February 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28027473/pyrosequencing-reveals-microbial-community-dynamics-in-integrated-simultaneous-desulfurization-and-denitrification-process-at-different-influent-nitrate-concentrations
#9
Chuan Chen, Xi-Jun Xu, Peng Xie, Ye Yuan, Xu Zhou, Ai-Jie Wang, Duu-Jong Lee, Nan-Qi Ren
Integrated simultaneous desulfurization and denitrification (ISDD) process has proven to be feasible for the coremoval of sulfate, nitrate, and chemical oxygen demand (COD). In this study, we aimed to reveal the microbial community dynamics in the ISDD process with different influent nitrate (NO3(-)) concentrations. For all tested scenarios, full denitrification was accomplished while sulfate removal efficiency decreased along with increased influent NO3(-) concentrations. The proportion of S(0) to influent SO4(2-) maintained a low level (5...
March 2017: Chemosphere
https://www.readbyqxmd.com/read/27597850/conductive-fe3o4-nanoparticles-accelerate-syntrophic-methane-production-from-butyrate-oxidation-in-two-different-lake-sediments
#10
Jianchao Zhang, Yahai Lu
Syntrophic methanogenesis is an essential link in the global carbon cycle and a key bioprocess for the disposal of organic waste and production of biogas. Recent studies suggest direct interspecies electron transfer (DIET) is involved in electron exchange in methanogenesis occurring in paddy soils, anaerobic digesters, and specific co-cultures with Geobacter. In this study, we evaluate the possible involvement of DIET in the syntrophic oxidation of butyrate in the enrichments from two lake sediments (an urban lake and a natural lake)...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27437436/proteomic-data-set-of-the-organohalide-respiring-epsilonproteobacterium-sulfurospirillum-multivorans-adapted-to-tetrachloroethene-and-other-energy-substrates
#11
Tobias Goris, Christian L Schiffmann, Jennifer Gadkari, Lorenz Adrian, Martin von Bergen, Gabriele Diekert, Nico Jehmlich
Sulfurospirillum multivorans is a free-living, physiologically versatile Epsilonproteobacterium able to couple the reductive dehalogenation of chlorinated and brominated ethenes to growth (organohalide respiration). We present proteomic data of S. multivorans grown with different electron donors (formate or pyruvate) and electron acceptors (fumarate, nitrate, or tetrachloroethene [PCE]). To obtain information on the cellular localization of proteins, membrane extracts and soluble fractions were separated before data collection from both fractions...
September 2016: Data in Brief
https://www.readbyqxmd.com/read/27324397/diverse-sulfur-metabolisms-from-two-subterranean-sulfidic-spring-systems
#12
Karen Rossmassler, Thomas E Hanson, Barbara J Campbell
In sulfidic environments, microbes oxidize reduced sulfur compounds via several pathways. We used metagenomics to investigate sulfur metabolic pathways from microbial mat communities in two subterranean sulfidic streams in Lower Kane Cave, WY, USA and from Glenwood Hot Springs, CO, USA. Both unassembled and targeted recA gene assembly analyses revealed that these streams were dominated by Epsilonproteobacteria and Gammaproteobacteria, including groups related to Sulfurovum, Sulfurospirillum, Thiothrix and an epsilonproteobacterial group with no close cultured relatives...
August 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27274028/the-smul_1544-gene-product-governs-norcobamide-biosynthesis-in-the-tetrachloroethene-respiring-bacterium-sulfurospirillum-multivorans
#13
Sebastian Keller, Aaron Treder, Stephan H von Reuss, Jorge C Escalante-Semerena, Torsten Schubert
UNLABELLED: The tetrachloroethene (PCE)-respiring bacterium Sulfurospirillum multivorans produces a unique cobamide, namely, norpseudo-B12, which, in comparison to other cobamides, e.g., cobalamin and pseudo-B12, lacks the methyl group in the linker moiety of the nucleotide loop. In this study, the protein SMUL_1544 was shown to be responsible for the formation of the unusual linker moiety, which is most probably derived from ethanolamine-phosphate (EA-P) as the precursor. The product of the SMUL_1544 gene successfully complemented a Salmonella enterica ΔcobD mutant...
August 15, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/26983005/comparative-genomic-analysis-of-sulfurospirillum-cavolei-mes-reconstructed-from-the-metagenome-of-an-electrosynthetic-microbiome
#14
COMPARATIVE STUDY
Daniel E Ross, Christopher W Marshall, Harold D May, R Sean Norman
Sulfurospirillum spp. play an important role in sulfur and nitrogen cycling, and contain metabolic versatility that enables reduction of a wide range of electron acceptors, including thiosulfate, tetrathionate, polysulfide, nitrate, and nitrite. Here we describe the assembly of a Sulfurospirillum genome obtained from the metagenome of an electrosynthetic microbiome. The ubiquity and persistence of this organism in microbial electrosynthesis systems suggest it plays an important role in reactor stability and performance...
2016: PloS One
https://www.readbyqxmd.com/read/26508873/enumeration-of-organohalide-respirers-in-municipal-wastewater-anaerobic-digesters
#15
Bryan Jk Smith, Melissa A Boothe, Brice A Fiddler, Tania M Lozano, Russel K Rahi, Mark J Krzmarzick
Organohalide contaminants such as triclosan and triclocarban have been well documented in municipal wastewater treatment plants (WWTPs), but the degradation of these contaminants is not well understood. One possible removal mechanism is organohalide respiration by which bacteria reduce the halogenated compound. The purpose of this study was to determine the abundance of organohalide-respiring bacteria in eight WWTP anaerobic digesters. The obligate organohalide respiring Dehalococcoides mccartyi was the most abundant and averaged 3...
2015: Microbiology Insights
https://www.readbyqxmd.com/read/26387727/proteomics-of-the-organohalide-respiring-epsilonproteobacterium-sulfurospirillum-multivorans-adapted-to-tetrachloroethene-and-other-energy-substrates
#16
Tobias Goris, Christian L Schiffmann, Jennifer Gadkari, Torsten Schubert, Jana Seifert, Nico Jehmlich, Martin von Bergen, Gabriele Diekert
Organohalide respiration is an environmentally important but poorly characterized type of anaerobic respiration. We compared the global proteome of the versatile organohalide-respiring Epsilonproteobacterium Sulfurospirillum multivorans grown with different electron acceptors (fumarate, nitrate, or tetrachloroethene [PCE]). The most significant differences in protein abundance were found for gene products of the organohalide respiration region. This genomic region encodes the corrinoid and FeS cluster containing PCE reductive dehalogenase PceA and other proteins putatively involved in PCE metabolism such as those involved in corrinoid biosynthesis...
September 21, 2015: Scientific Reports
https://www.readbyqxmd.com/read/25814615/complete-genome-sequences-of-sulfurospirillum-strains-uch001-and-uch003-isolated-from-groundwater-in-japan
#17
Takamasa Miura, Yoshihito Uchino, Keiko Tsuchikane, Yoshiyuki Ohtsubo, Shoko Ohji, Akira Hosoyama, Masako Ito, Yoh Takahata, Atsushi Yamazoe, Ken-Ichiro Suzuki, Nobuyuki Fujita
Sulfurospirillum strains UCH001 and UCH003 were isolated from anaerobic cis-1,2-dichloroethene-dechlorinating microbial consortia derived from groundwater in Japan. Here, we report the complete genome sequences of strains UCH001 and UCH003.
2015: Genome Announcements
https://www.readbyqxmd.com/read/25734359/substrate-hydrophobicity-and-cell-composition-influence-the-extent-of-rate-limitation-and-masking-of-isotope-fractionation-during-microbial-reductive-dehalogenation-of-chlorinated-ethenes
#18
Julian Renpenning, Insa Rapp, Ivonne Nijenhuis
This study investigated the effect of intracellular microscale mass transfer on microbial carbon isotope fractionation of tetrachloroethene (PCE) and trichloroethene (TCE). Significantly stronger isotope fractionation was observed for crude extracts vs intact cells of Sulfurospirillum multivorans, Geobacter lovleyi, Desulfuromonas michiganensis, Desulfitobacterium hafniense strain PCE-S, and Dehalobacter restrictus. Furthermore, carbon stable isotope fractionation was stronger for microorganisms with a Gram-positive cell envelope compared to those with a Gram-negative cell envelope...
April 7, 2015: Environmental Science & Technology
https://www.readbyqxmd.com/read/25682226/regeneration-of-elemental-sulfur-in-a-simultaneous-sulfide-and-nitrate-removal-reactor-under-different-dissolved-oxygen-conditions
#19
Xiaowei Wang, Yu Zhang, Jiti Zhou, Tingting Zhang, Mingxiang Chen
A continuous reactor in microaerobic conditions was adopted for sulfide-oxidizing, nitrate-reducing and elemental sulfur (S(0)) regenerating, simultaneously. The results showed that appropriate dissolved oxygen (DO) enhanced S(0) regeneration efficiency, sulfide oxidation efficiency, and nitrate reduction efficiency. When the DO concentration was 0.1-0.3 mg L(-1), the microaerobic bioreactor simultaneously converted 8.16 kg-Sm(-3)d(-1) of sulfide to S(0) and 2.48 kg-Nm(-3)d(-1) of nitrate to nitrogen with the sulfide and nitrate removal efficiency of 100% and 90% respectively...
April 2015: Bioresource Technology
https://www.readbyqxmd.com/read/25593246/draft-genome-sequence-of-sulfurospirillum-sp-strain-mes-reconstructed-from-the-metagenome-of-a-microbial-electrosynthesis-system
#20
Daniel E Ross, Christopher W Marshall, Harold D May, R Sean Norman
A draft genome of Sulfurospirillum sp. strain MES was isolated through taxonomic binning of a metagenome sequenced from a microbial electrosynthesis system (MES) actively producing acetate and hydrogen. The genome contains the nosZDFLY genes, which are involved in nitrous oxide reduction, suggesting the potential role of this strain in denitrification.
2015: Genome Announcements
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