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https://www.readbyqxmd.com/read/29240841/microcystin-lr-does-not-induce-alterations-to-transcriptomic-or-metabolomic-profiles-of-a-model-heterotrophic-bacterium
#1
Robbie M Martin, Stephen P Dearth, Gary R LeCleir, Shawn R Campagna, Elizabeth M Fozo, Erik R Zinser, Steven W Wilhelm
Microcystins are secondary metabolites produced by several freshwater, bloom-forming cyanobacterial species. Microcystin-producing cyanobacteria co-occur with a complex community of heterotrophic bacteria. Though conflicting, studies suggest that microcystins affect the physiology of heterotrophic bacteria by inducing oxidative stress and increasing cell envelope permeability. Based on these observations, we hypothesized that exposure to microcystin should induce differential expression in genes responding to oxidative and envelope stress and trigger shifts in metabolite pools...
2017: PloS One
https://www.readbyqxmd.com/read/29239721/natural-changes-in-light-interact-with-circadian-regulation-at-promoters-to-control-gene-expression-in-cyanobacteria
#2
Joseph Robert Piechura, Kapil Amarnath, Erin K O'Shea
The circadian clock interacts with other regulatory pathways to tune physiology to predictable daily changes and unexpected environmental fluctuations. However, the complexity of circadian clocks in higher organisms has prevented a clear understanding of how natural environmental conditions affect circadian clocks and their physiological outputs. Here, we dissect the interaction between circadian regulation and responses to fluctuating light in the cyanobacterium Synechococcus elongatus. We demonstrate that natural changes in light intensity substantially affect the expression of hundreds of circadian-clock-controlled genes, many of which are involved in key steps of metabolism...
December 14, 2017: ELife
https://www.readbyqxmd.com/read/29238929/evaluation-of-zinc-oxide-nanoparticles-on-lettuce-lactuca-sativa-l-growth-and-soil-bacterial-community
#3
Jiangbing Xu, Xiaosan Luo, Yanling Wang, Youzhi Feng
The wide spread of nanoparticles (NPs) has caused tremendous concerns on agricultural ecosystem. Some metallic NPs, such as zinc oxide (ZnO), can be utilized as a nano-fertilizer when used at optimal doses. However, little is known about the responses of plant development and concomitant soil bacteria community to ZnO NPs. The present pot experiment studied the impacts of different doses of ZnO NPs and bulk ZnO (0, 1, 10, 100 mg ZnO/kg), on the growth of lettuce (Lactuca sativa L.) and the associated rhizospheric soil bacterial community...
December 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29238333/environmental-factors-shape-water-microbial-community-structure-and-function-in-shrimp-cultural-enclosure-ecosystems
#4
Dongwei Hou, Zhijian Huang, Shenzheng Zeng, Jian Liu, Dongdong Wei, Xisha Deng, Shaoping Weng, Zhili He, Jianguo He
The effects of environmental factors on water microbial communities have been extensively studied, but little is known about the effects in shrimp cultural enclosure ecosystems. We analyzed 16S rRNA gene amplicons to determine the principal environmental factors that shape the structure and function of microbial communities in shrimp cultural enclosure ecosystems from Guangdong and Hainan provinces, in China. High quality sequences were clustered into operational taxonomic units (OTUs) at the 97% similarity level, generating 659-1,835 OTUs per sample...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29235513/metabolic-engineering-of-the-pentose-phosphate-pathway-for-enhanced-limonene-production-in-the-cyanobacterium-synechocysti-s-sp-pcc-6803
#5
Po-Cheng Lin, Rajib Saha, Fuzhong Zhang, Himadri B Pakrasi
Isoprenoids are diverse natural compounds, which have various applications as pharmaceuticals, fragrances, and solvents. The low yield of isoprenoids in plants makes them difficult for cost-effective production, and chemical synthesis of complex isoprenoids is impractical. Microbial production of isoprenoids has been considered as a promising approach to increase the yield. In this study, we engineered the model cyanobacterium Synechocystis sp. PCC 6803 for sustainable production of a commercially valuable isoprenoid, limonene...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29235508/genetic-adaptation-of-microbial-populations-present-in-high-intensity-catfish-production-systems-with-therapeutic-oxytetracycline-treatment
#6
Qifan Zeng, Xiangli Tian, Luxin Wang
Microbial communities that are present in aquaculture production systems play significant roles in degrading organic matter, controlling diseases, and formation of antibiotic resistance. It is important to understand the diversity and abundance of microbial communities and their genetic adaptations associated with environmental physical and chemical changes. Here we collected water and sediment samples from a high-intensity catfish production system and its original water reservoir. The metagenomic analysis showed that Proteobacteria, Actinobacteria, Bacteroidetes, Cyanobacteria, and Firmicutes were the top five phyla identified from all samples...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29235032/monitoring-and-research-of-microcystins-and-environmental-factors-in-a-typical-artificial-freshwater-aquaculture-pond
#7
Xiaobin Hu, Rongfei Zhang, Jinyun Ye, Xiang Wu, Yixiang Zhang, Chenglong Wu
Freshwater aquaculture ponds are important artificially regulated aquatic ecosystems which provide a large number of freshwater fish products in China. The cyanobacteria bloom and microcystin (MC) pollution caused by anthropogenic eutrophication have attracted much attention due to their toxic effects. To provide an insight into the cyanobacterial problem in the ponds, the environmental parameters and MCs of a typical artificial pond in the Yangtze River Delta region of China were monitored and studied from May to December 2015...
December 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29235019/investigation-of-the-interaction-of-%C3%AE-methylamino-l-alanine-with-eukaryotic-and-prokaryotic-proteins
#8
Brendan J Main, Carly J Italiano, Kenneth J Rodgers
There is a strong body of evidence linking the non-protein amino acid (NPAA) β-methylamino-L-alanine (BMAA) to the development of a number of neurodegenerative diseases. BMAA has been found globally, is produced by a number of organisms including cyanobacteria, diatoms, and dinoflagellates; and has been shown to biomagnify through trophic levels. The role of BMAA in neurodegenerative disease is highlighted by its presence in the brains of a number of neurodegenerative disease patients, where it was found in a protein-bound form...
December 12, 2017: Amino Acids
https://www.readbyqxmd.com/read/29233225/photosynthetic-water-splitting-by-the-mn4ca2-ox-catalyst-of-photosystem-ii-its-structure-robustness-and-mechanism
#9
James Barber
The biological energy cycle of our planet is driven by photosynthesis whereby sunlight is absorbed by chlorophyll and other accessory pigments. The excitation energy is then efficiently transferred to a reaction centre where charge separation occurs in a few picoseconds. In the case of photosystem II (PSII), the energy of the charge transfer state is used to split water into oxygen and reducing equivalents. This is accomplished by the relatively low energy content of four photons of visible light. PSII is a large multi-subunit membrane protein complex embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria...
January 2017: Quarterly Reviews of Biophysics
https://www.readbyqxmd.com/read/29232504/a-genetic-toolbox-for-modulating-the-expression-of-heterologous-genes-in-the-cyanobacterium-synechocystis-sp-pcc-6803
#10
Bo Wang, Carrie Eckert, Pin-Ching Maness, Jianping Yu
Cyanobacteria, genetic models for photosynthesis research for decades, have recently become attractive hosts for producing renewable fuels and chemicals, owing to their genetic tractability, relatively fast growth, and their ability to utilize sunlight, fix carbon dioxide and, in some cases, fix nitrogen. Despite significant advances, there is still an urgent demand for synthetic biology tools in order to effectively manipulate genetic circuits in cyanobacteria. In this study, we have compared a total of 17 natural and chimeric promoters, focusing on expression of the ethylene-forming enzyme (EFE) in the cyanobacterium Synechocystis sp...
December 12, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29230026/homogenization-of-lake-cyanobacterial-communities-over-a-century-of-climate-change-and-eutrophication
#11
Marie-Eve Monchamp, Piet Spaak, Isabelle Domaizon, Nathalie Dubois, Damien Bouffard, Francesco Pomati
Human impacts on biodiversity are well recognized, but uncertainties remain regarding patterns of diversity change at different spatial and temporal scales. Changes in microbial assemblages are, in particular, not well understood, partly due to the lack of community composition data over relevant scales of space and time. Here, we investigate biodiversity patterns in cyanobacterial assemblages over one century of eutrophication and climate change by sequencing DNA preserved in the sediments of ten European peri-Alpine lakes...
December 11, 2017: Nature Ecology & Evolution
https://www.readbyqxmd.com/read/29229875/re-engineering-the-two-component-systems-as-light-regulated-in-escherichia-coli
#12
Siya Ma, Siwei Luo, L I Wu, Zhi Liang, Jia-Rui Wu
Bacteria live in environments with dynamic changes. To sense and respond to different external stimuli, bacteria make use of various sensor-response circuits, called two-component systems (TCSs). A TCS comprises a histidine protein kinase (HK) sensing environmental stimuli and a response regulator protein (RR) regulating downstream genes. The two components are coupled via a phosphorylation control mechanism. In a recent study, we adopted an optogenetics approach to re-engineer the sensor HKs in Escherichia coli as a light-sensing fusion protein...
December 2017: Journal of Biosciences
https://www.readbyqxmd.com/read/29229775/molecular-characterization-of-dxcf-cyanobacteriochromes-from-the-cyanobacterium-acaryochloris-marina-identifies-a-blue-light-power-sensor
#13
Masumi Hasegawa, Keiji Fushimi, Keita Miyake, Takahiro Nakajima, Yuki Oikawa, Gen Enomoto, Moritoshi Sato, Masahiko Ikeuchi, Rei Narikawa
Cyanobacteriochromes (CBCRs) are linear tetrapyrrole-binding photoreceptors that sense a wide range of wavelengths from ultraviolet to far-red. The primary photoreaction in these reactions is a Z/E isomerization of the double bond between rings C and D. After this isomerization, various color-tuning events establish distinct spectral properties of the CBCRs. Among the various CBCRs, the DXCF CBCR lineage is widely distributed among cyanobacteria. Because the DXCF CBCRs from the cyanobacterium Acaryochloris marina vary widely in sequence, we focused on these CBCRs in this study...
December 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29228342/a-highly-asynchronous-developmental-program-triggered-during-germination-of-dormant-akinetes-of-the-filamentous-diazotrophic-cyanobacteria
#14
Rebeca Perez, Lars Wörmer, Peter Sass, Iris Maldener
Germination of akinetes of filamentous heterocyst-forming cyanobacteria of the order Nostocales is an essential process that ensures survival and recolonization after long periods of unfavorable conditions, as desiccation, cold and low light. We studied the morphological, physiological, and metabolic changes that occur during germination of akinetes in two model species of cell differentiation, Anabaena variabilis ATCC 29413 and Nostoc punctiforme ATCC 29133, which live in different habitats. We characterized the akinete envelopes and showed their similarity to envelopes of N2-fixing heterocysts...
December 6, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29226768/algal-treatment-of-wastewater-generated-during-oil-and-gas-production-using-hydraulic-fracturing-technology
#15
Giovanni Antonio Lutzu, Nurhan Turgut Dunford
Hydraulic fracturing technology is widely used for recovering natural gas and oil from tight oil and gas reserves. Large volumes of wastewater, flowback water, are produced during the fracturing process. This study examines algal treatment of flowback water. Thirteen microalgae strains consisting of cyanobacteria and green algae were examined. Wastewater quality before and after algae treatment and volatile matter, fixed carbon and ash contents of the biomass grown in flowback water were examined. The experimental results demonstrated that microalgae can grow in flowback water...
December 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29225764/sodium-chloride-accumulation-in-glycophyte-plants-with-cyanobacterial-symbionts
#16
Thomas George Allan Green, Leopoldo G Sancho, Ana Pintado, Dolores Saco, Soledad Martín, María Arróniz-Crespo, Miguel Angel Casermeiro, Maria Teresa de la Cruz Caravaca, Steven Cameron, Ricardo Rozzi
The majority of plant species are glycophytes and are not salt-tolerant and maintain low sodium levels within their tissues; if. high tissue sodium concentrations do occur, it is in response to elevated environmental salt levels. Here we report an apparently novel and taxonomically diverse grouping of plants that continuously maintain high tissue sodium contents and share the rare feature of possessing symbiotic cyanobacteria. Leaves of Gunnera magellanica in Tierra del Fuego always had sodium contents (dry weight basis) of around 4...
November 2017: AoB Plants
https://www.readbyqxmd.com/read/29223152/electron-transfer-through-the-acceptor-side-of-photosystem-i-interaction-with-exogenous-acceptors-and-molecular-oxygen
#17
REVIEW
D A Cherepanov, G E Milanovsky, A A Petrova, A N Tikhonov, A Yu Semenov
This review considers the state-of-the-art on mechanisms and alternative pathways of electron transfer in photosynthetic electron transport chains of chloroplasts and cyanobacteria. The mechanisms of electron transport control between photosystems (PS) I and II and the Calvin-Benson cycle are considered. The redistribution of electron fluxes between the noncyclic, cyclic, and pseudocyclic pathways plays an important role in the regulation of photosynthesis. Mathematical modeling of light-induced electron transport processes is considered...
November 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/29222097/a-new-niche-for-anoxygenic-phototrophs-as-endoliths
#18
Daniel Roush, Estelle Couradeau, Brandon Guida, Susanne Neuer, Ferran Garcia-Pichel
Anoxygenic phototrophic bacteria (APBs) occur in a wide range of aquatic habitats, from hot springs to freshwater lakes and intertidal microbial mats. Here we report the discovery of a novel niche for APBs: endoliths within marine littoral carbonates. In a study of 40 locations around Isla de Mona, Puerto Rico, and Menorca, Spain, 16S rRNA high-throughput sequencing of endolithic community DNA revealed the presence of abundant phylotypes potentially belonging to well-known APB clades. An ad hoc phylogenetic classification of these sequences allowed us to refine the assignments more stringently...
December 8, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29221464/molecular-and-functional-characterization-of-ferredoxin-nadp-h-oxidoreductase-from-gracilaria-chilensis-and-its-complex-with-ferredoxin
#19
María Alejandra Vorphal, Carola Bruna, Traudy Wandersleben, Jorge Dagnino-Leone, Francisco Lobos-González, Elena Uribe, José Martínez-Oyanedel, Marta Bunster
BACKGROUD: Ferredoxin NADP(H) oxidoreductases (EC 1.18.1.2) (FNR) are flavoenzymes present in photosynthetic organisms; they are relevant for the production of reduced donors to redox reactions, i.e. in photosynthesis, the reduction of NADP+ to NADPH using the electrons provided by Ferredoxin (Fd), a small FeS soluble protein acceptor of electrons from PSI in chloroplasts. In rhodophyta no information about this system has been reported, this work is a contribution to the molecular and functional characterization of FNR from Gracilaria chilensis, also providing a structural analysis of the complex FNR/Fd...
December 8, 2017: Biological Research
https://www.readbyqxmd.com/read/29220784/physiological-effects-caused-by-microcystin-producing-and-non-microcystin-producing-microcystis-aeruginosa-on-medaka-fish-a%C3%A2-proteomic-and-metabolomic-study-on-liver
#20
Séverine Le Manach, Benoit Sotton, Hélène Huet, Charlotte Duval, Alain Paris, Arul Marie, Claude Yépremian, Arnaud Catherine, Lucrèce Mathéron, Joelle Vinh, Marc Edery, Benjamin Marie
Cyanobacterial blooms have become a common phenomenon in eutrophic freshwater ecosystems worldwide. Microcystis is an important bloom-forming and toxin-producing genus in continental aquatic ecosystems, which poses a potential risk to Human populations as well as on aquatic organisms. Microcystis is known to produce along with various bioactive peptides, the microcystins (MCs) that have attracted more attention notably due to their high hepatotoxicity. To better understand the effects of cyanobacterial blooms on fish, medaka fish (Oryzias latipes) were sub-chronically exposed to either non-MC-producing or MC-producing living strains and, for this latter, to its subsequent MC-extract of Microcystis aeruginosa...
December 5, 2017: Environmental Pollution
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