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manganese reducing bacteria

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https://www.readbyqxmd.com/read/29783045/factors-affecting-gene-expression-and-activity-of-heme-and-manganese-dependent-catalases-in-lactobacillus-casei-strains
#1
Annamaria Ricciardi, Rocco Gerardo Ianniello, Eugenio Parente, Teresa Zotta
Catalases reduce oxidative stress by degrading hydrogen peroxide to molecular oxygen and water. The presence of heme-dependent or manganese-dependent catalases was observed for a long time in lactic acid bacteria (LAB) but, to date, knowledge on the factors affecting gene expression and enzymatic functionality are limited to a very few strains. In this study, the effect of atmosphere of incubation (not aerated static growth vs aerated shaken growth) and supplementation with Fe2+ , hemin, Mn2+ or their combinations on the catalase production of respiration-competent strain Lactobacillus casei N87 was evaluated using a 24 factorial design...
May 8, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29761210/biochemical-properties-of-bacterial-reverse-transcriptase-related-rvt-gene-products-multimerization-protein-priming-and-nucleotide-preference
#2
Irina A Yushenova, Irina R Arkhipova
Cellular reverse transcriptase-related (rvt) genes represent a novel class of reverse transcriptases (RTs), which are only distantly related to RTs of retrotransposons and retroviruses, but, similarly to telomerase RTs, are immobilized in the genome as single-copy genes. They have been preserved by natural selection throughout the evolutionary history of large taxonomic groups, including most fungi, a few plants and invertebrates, and even certain bacteria, being the only RTs present across different domains of life...
May 14, 2018: Current Genetics
https://www.readbyqxmd.com/read/29673961/metabolic-effects-of-manganese-in-the-nematode-caenorhabditis-elegans-through-daergic-pathway-and-transcription-factors-activation
#3
Priscila Gubert, Bruna Puntel, Tassia Lehmen, Joshua P Fessel, Pan Cheng, Julia Bornhorst, Lucas Siqueira Trindade, Daiana S Avila, Michael Aschner, Felix A A Soares
Manganese (Mn) is an essential trace element for physiological functions since it acts as an enzymatic co-factor. Nevertheless, overexposure to Mn has been associated with a pathologic condition called manganism. Furthermore, Mn has been reported to affect lipid metabolism by mechanisms which have yet to be established. Herein, we used the nematode Caenorhabditis elegans to examine Mn's effects on the dopaminergic (DAergic) system and determine which transcription factors that regulate with lipid metabolism are affected by it...
April 16, 2018: Neurotoxicology
https://www.readbyqxmd.com/read/29413959/role-of-gut-microbiota-and-oxidative-stress-in-the-progression-of-non-alcoholic-fatty-liver-disease-to-hepatocarcinoma-current-and-innovative-therapeutic-approaches
#4
REVIEW
Antonella Borrelli, Patrizia Bonelli, Franca Maria Tuccillo, Ira D Goldfine, Joseph L Evans, Franco Maria Buonaguro, Aldo Mancini
Non-alcoholic fatty liver disease (NAFLD) represents the most common chronic liver disease in industrialized countries. NAFLD progresses through the inflammatory phase of non-alcoholic steatohepatitis (NASH) to fibrosis and cirrhosis, with some cases developing liver failure or hepatocellular carcinoma (HCC). Liver biopsy remains the gold standard approach to a definitive diagnosis of NAFLD and the distinction between simple steatosis and NASH. The pathogenesis of NASH is still not clear. Several theories have been proposed ranging from the "Two Hit Theory" to the "Multiple Hit Theory"...
May 2018: Redox Biology
https://www.readbyqxmd.com/read/29156333/short-and-long-term-effects-of-manganese-zinc-and-copper-ions-on-nitrogen-removal-in-nitritation-anammox-process
#5
Huayu Li, Hong Yao, Dayi Zhang, Lushen Zuo, Jia Ren, Jinyuan Ma, Jin Pei, Yaru Xu, Chengyong Yang
This study provided a deep insight into the impacts of trace elements (Mn2+ , Zn2+ and Cu2+ ) on nitritation-anammox process. For short-term exposure, all the three elements could improve the nitrogen removal rate (NRR) and the optimal concentrations were 2.0 mg/L, 2.0 mg/L and 0.5 mg/L for Mn2+ , Zn2+ and Cu2+ , respectively. Accordingly, the NRRs were enhanced 54.62%, 45.93% and 44.09%. The long-term experiments were carried out in lab-scale sequencing batch reactors. The surprising results showed that only Mn2+ addition could enhance the long-term nitritation-anammox process, and the NRR increased from 0...
February 2018: Chemosphere
https://www.readbyqxmd.com/read/29063458/geochemical-fractions-and-phytoavailability-of-zinc-in-a-contaminated-calcareous-soil-affected-by-biotic-and-abiotic-amendments
#6
Seyed Majid Mousavi, Babak Motesharezadeh, Hossein Mirseyed Hosseini, Hoseinali Alikhani, Ali Asghar Zolfaghari
Many studies have conducted to determine the best management practice to reduce the mobility and phytoavailability of the trace metals in contaminated soils. In this study, geochemical speciation and phytoavailability of Zn for sunflower were studied after application of nanoparticles (SiO2 and zeolite, with an application rate of 200 mg kg(-1)) and bacteria [Bacillus safensis FO-036b(T) and Pseudomonas fluorescens p.f.169] to a calcareous heavily contaminated soil. Results showed that the biotic and abiotic treatments significantly reduced the Zn concentration in the aboveground to non-toxicity levels compared to the control treatment, and the nanoparticle treatments were more effective than the bacteria and control treatments...
October 23, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28887999/preferential-killing-of-bacterial-cells-by-hybrid-carbon-nanotube-mno-2-nanocomposite-synthesized-by-novel-microwave-assisted-processing
#7
D Sivaraj, K Vijayalakshmi
We present a comprehensive study on the enhanced effect of CNT addition on the structural, optical, morphological and antibacterial properties of CNT-MnO2 nanocomposite synthesized by microwave assisted processing. X-ray diffraction pattern of the hybrid CNT/MnO2 nanocomposite revealed the shifting of highly oriented MnO2 preferential planes. SEM images show porous MnO2 nanospheres uniformly and discretely attached on the walls of carbon nanotube network. Significant variation in the peak shape and IR absorption intensity with CNT addition, indicate the interaction of CNT ions with MnO2 nanoparticles...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28856622/binding-selectivity-of-methanobactin-from-methylosinus-trichosporium-ob3b-for-copper-i-silver-i-zinc-ii-nickel-ii-cobalt-ii-manganese-ii-lead-ii-and-iron-ii
#8
Jacob W McCabe, Rajpal Vangala, Laurence A Angel
Methanobactin (Mb) from Methylosinus trichosporium OB3b is a member of a class of metal binding peptides identified in methanotrophic bacteria. Mb will selectively bind and reduce Cu(II) to Cu(I), and is thought to mediate the acquisition of the copper cofactor for the enzyme methane monooxygenase. These copper chelating properties of Mb make it potentially useful as a chelating agent for treatment of diseases where copper plays a role including Wilson's disease, cancers, and neurodegenerative diseases. Utilizing traveling wave ion mobility-mass spectrometry (TWIMS), the competition for the Mb copper binding site from Ag(I), Pb(II), Co(II), Fe(II), Mn(II), Ni(II), and Zn(II) has been determined by a series of metal ion titrations, pH titrations, and metal ion displacement titrations...
December 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28620785/microbial-interspecies-interactions-affect-arsenic-fate-in-the-presence-of-mn-ii
#9
Jinsong Liang, Yaohui Bai, Jiuhui Qu
Biotransformation of arsenic (As) plays an important role in its environmental fate. However, the impact of direct microbial interspecies interactions on valence state and migration of As is rarely reported and cognized. Here, by co-cultivating two aerobic As(V)-reducing bacteria (Arthrobacter sp. QXT-31 and Sphingopyxis sp. QXT-31) in a culture medium containing initial As(V) (10 μM) and bivalent manganese (Mn(II), 175 μM), we demonstrated how the interactions between strains affect valence state and partition of As...
November 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28533178/mucin-and-carbohydrate-stimulated-adhesion-and-subproteome-changes-of-the-probiotic-bacterium-lactobacillus-acidophilus-ncfm
#10
Hasan Ufuk Celebioglu, Sita Vaag Olesen, Kennie Prehn, Sampo J Lahtinen, Susanne Brix, Maher Abou Hachem, Birte Svensson
Adhesion to intestinal mucosa is a crucial property for probiotic bacteria. Adhesion is thought to increase host-bacterial interactions, thus potentially enabling health benefits to the host. Molecular events connected with adhesion and surface proteome changes were investigated for the probiotic Lactobacillus acidophilus NCFM cultured with established or emerging prebiotic carbohydrates as carbon source and in the presence of mucin, the glycoprotein of the epithelial mucus layer. Variation in adhesion to HT29-cells and mucin was associated with carbon source and mucin-induced subproteome abundancy differences...
June 23, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28355974/microbial-alginate-dressings-show-improved-binding-capacity-for-pathophysiological-factors-in-chronic-wounds-compared-to-commercial-alginate-dressings-of-marine-origin
#11
Melissa Fischer, Florian Gebhard, Timo Hammer, Christian Zurek, Guido Meurer, Christoph Marquardt, Dirk Hoefer
Marine alginates are well established in wound management. Compared with different modern wound dressings, marine alginates cannot prove superior effects on wound healing. Alginates from bacteria have never been studied for medical applications so far, although the microbial polymer raises expectations for improved binding of wound factors because of its unique O-acetylation. Due to its possible positive effects on wound healing, alginates from bacteria might be a superior future medical product for clinical use...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28128836/substrate-specificity-and-copper-loading-of-the-manganese-oxidizing-multicopper-oxidase-mnx-from-bacillus-sp-pl-12
#12
Cristina N Butterfield, Bradley M Tebo
Manganese(ii) oxidation in the environment is thought to be driven by bacteria because enzymatic catalysis is many orders of magnitude faster than the abiotic processes. The heterologously purified Mn oxidase (Mnx) from marine Bacillus sp. PL-12 is made up of the multicopper oxidase (MCO) MnxG and two small Cu and heme-binding proteins of unknown function, MnxE and MnxF. Mnx binds Cu and oxidizes both Mn(ii) and Mn(iii), generating Mn(iv) oxide minerals that resemble those found on the Bacillus spore surface...
February 22, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28127804/perturbation-of-manganese-metabolism-disrupts-cell-division-in-streptococcus-pneumoniae
#13
Julia E Martin, John P Lisher, Malcolm E Winkler, David P Giedroc
Manganese (Mn) is an essential micronutrient and required cofactor in bacteria. Despite its importance, excess Mn can impair bacterial growth, the mechanism of which remains largely unexplored. Here, we show that proper Mn homeostasis is critical for cellular growth of the major human respiratory pathogen Streptococcus pneumoniae. Perturbations in Mn homeostasis genes, psaBCA, encoding the Mn importer, and mntE, encoding the Mn exporter, lead to Mn sensitivity during aerobiosis. Mn-stressed cells accumulate iron and copper, in addition to Mn...
April 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/27757565/the-impact-of-lactoferrin-with-different-levels-of-metal-saturation-on-the-intestinal-epithelial-barrier-function-and-mucosal-inflammation
#14
Grzegorz Majka, Grażyna Więcek, Małgorzata Śróttek, Klaudyna Śpiewak, Małgorzata Brindell, Joanna Koziel, Janusz Marcinkiewicz, Magdalena Strus
Translocation of bacteria, primarily Gram-negative pathogenic flora, from the intestinal lumen into the circulatory system leads to sepsis. In newborns, and especially very low birth weight infants, sepsis is a major cause of morbidity and mortality. The results of recently conducted clinical trials suggest that lactoferrin, an iron-binding protein that is abundant in mammalian colostrum and milk, may be an effective agent in preventing sepsis in newborns. However, despite numerous basic studies on lactoferrin, very little is known about how metal saturation of this protein affects a host's health...
December 2016: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/27683212/bacterial-communities-involved-in-sulfur-transformations-in-wastewater-treatment-plants
#15
Daniel Derrossi Meyer, Pedro Avelino Maia de Andrade, Ademir Durrer, Fernando Dini Andreote, Gertrudes Corção, Adriano Brandelli
The main sulfate-reducing (SRB) and sulfur-oxidizing bacteria (SOB) in six wastewater treatment plants (WWTPs) located at southern Brazil were described based on high-throughput sequencing of the 16S rDNA. Specific taxa of SRB and SOB were correlated with some abiotic factors, such as the source of the wastewater, oxygen content, sample type, and physical chemical attributes of these WWTPs. When the 22 families of SRB and SOB were clustered together, the samples presented a striking distribution, demonstrating grouping patterns according to the sample type...
December 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27571690/competition-for-manganese-at-the-host-pathogen-interface
#16
REVIEW
J L Kelliher, T E Kehl-Fie
Transition metals such as manganese are essential nutrients for both pathogen and host. Vertebrates exploit this necessity to combat invading microbes by restricting access to these critical nutrients, a defense known as nutritional immunity. During infection, the host uses several mechanisms to impose manganese limitation. These include removal of manganese from the phagolysosome, sequestration of extracellular manganese, and utilization of other metals to prevent bacterial acquisition of manganese. In order to cause disease, pathogens employ a variety of mechanisms that enable them to adapt to and counter nutritional immunity...
2016: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/27342559/production-of-manganese-oxide-nanoparticles-by-shewanella-species
#17
Mitchell H Wright, Saad M Farooqui, Alan R White, Anthony C Greene
UNLABELLED: Several species of the bacterial genus Shewanella are well-known dissimilatory reducers of manganese under anaerobic conditions. In fact, Shewanella oneidensis is one of the most well studied of all metal-reducing bacteria. In the current study, a number of Shewanella strains were tested for manganese-oxidizing capacity under aerobic conditions. All were able to oxidize Mn(II) and to produce solid dark brown manganese oxides. Shewanella loihica strain PV-4 was the strongest oxidizer, producing oxides at a rate of 20...
September 1, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27178230/functional-analysis-of-an-feob-mutant-in-clostridium-perfringens-strain-13
#18
Milena M Awad, Jackie K Cheung, Joanne E Tan, Alastair G McEwan, Dena Lyras, Julian I Rood
Bacterial pathogens have adopted numerous mechanisms for acquiring iron from host proteins during an infection, including the direct acquisition of ferric iron from heme-associated proteins or from iron-scavenging siderophores. Ferric iron then is transported into the cytosol, where it can be utilized by the bacterial pathogen. Under anaerobic conditions bacteria can also transport ferrous iron using the transmembrane complex FeoAB, but little is known about iron transport systems in anaerobic bacteria such as the pathogenic clostridia...
October 2016: Anaerobe
https://www.readbyqxmd.com/read/26943637/biological-manganese-oxidation-by-pseudomonas-putida-in-trickling-filters
#19
Kyle P McKee, Cherish C Vance, Raghupathy Karthikeyan
Biological oxidation has been researched as a viable alternative for treating waters with high manganese (Mn) concentrations, typically found in mine drainage or in some geological formations. In this study, laboratory-scale trickling filters were constructed to compare the Mn removal efficiency between filters inoculated with the Mn oxidizing bacteria, Pseudomonas putida, and filters without inoculation. Manganese oxidation and removal was found to be significantly greater in trickling filters with Pseudomonas putida after startup times of only 48 h...
2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/26918615/binder-free-graphene-and-manganese-oxide-coated-carbon-felt-anode-for-high-performance-microbial-fuel-cell
#20
Changyong Zhang, Peng Liang, Xufei Yang, Yong Jiang, Yanhong Bian, Chengmeng Chen, Xiaoyuan Zhang, Xia Huang
A novel anode was developed by coating reduced graphene oxide (rGO) and manganese oxide (MnO2) composite on the carbon felt (CF) surface. With a large surface area and excellent electrical conductivity, this binder-free anode was found to effectively enhance the enrichment and growth of electrochemically active bacteria and facilitate the extracellular electron transfer from the bacteria to the anode. A microbial fuel cell (MFC) equipped with the rGO/MnO2/CF anode delivered a maximum power density of 2065mWm(-2), 154% higher than that with a bare CF anode...
July 15, 2016: Biosensors & Bioelectronics
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