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https://www.readbyqxmd.com/read/28345890/relationship-of-microbiota-and-cyanobacterial-secondary-metabolites-in-planktothricoides-dominated-bloom
#1
Shu Harn Te, Boon Fei Tan, Janelle Renee Thompson, Karina Yew-Hoong Gin
Identification of phytoplankton species and microbial biodiversity is necessary to assess water ecosystem health and the quality of water resources. We investigated the short-term (2 days) vertical and diel variations in bacterial community structure and microbially-derived secondary metabolites during a cyanobacterial bloom that emerged in a highly urbanized tropical reservoir. The waterbody was largely dominated by the cyanobacteria Planktothricoides spp., together with the Synechococcus, Pseudanabaena, Prochlorothrix and Limnothrix...
March 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28344645/mimicking-lichens-incorporation-of-yeast-strains-together-with-sucrose-secreting-cyanobacteria-improves-survival-growth-ros-removal-and-lipid-production-in-a-stable-mutualistic-co-culture-production-platform
#2
Tingting Li, Chien-Ting Li, Kirk Butler, Stephanie G Hays, Michael T Guarnieri, George A Oyler, Michael J Betenbaugh
BACKGROUND: The feasibility of heterotrophic-phototrophic symbioses was tested via pairing of yeast strains Cryptococcus curvatus, Rhodotorula glutinis, or Saccharomyces cerevisiae with a sucrose-secreting cyanobacterium Synechococcus elongatus. RESULTS: The phototroph S. elongatus showed no growth in standard BG-11 medium with yeast extract, but grew well in BG-11 medium alone or supplemented with yeast nitrogen base without amino acids (YNB w/o aa). Among three yeast species, C...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28343753/limnothrix-sp-ko05-a-newly-characterized-cyanobacterial-biosorbent-for-cadmium-removal-the-enzymatic-and-non-enzymatic-antioxidant-reactions-to-cadmium-toxicity
#3
Omid Haghighi, Shahab Shahryari, Mojgan Ebadi, Sima Modiri, Hossein Shahbani Zahiri, Hadi Maleki, Kambiz Akbari Noghabi
In this study, we isolated five indigenous cyanobacterial strains from different aqueous environments, with heavy metals contamination, in East Azerbaijan Province (northwest portion of Iran). A strain was identified by morphological and 16S rRNA sequence analysis as Limnothrix sp. KO05 and selected for further studies as having the greatest potential for cadmium uptake. Scanning electron microscopy (SEM) demonstrated cyanobacterium Limnothrix sp. KO05 forms filamentous structures and is straight or curved to some extent...
March 18, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28343358/expression-of-the-cyanobacterial-enzyme-cyanase-increases-cyanate-metabolism-and-cyanate-tolerance-in-arabidopsis
#4
Rashad Kebeish, Omar Al-Zoubi
Cyanate and its derivatives are considered as environmental hazardous materials. Cyanate is released to the environment through many chemical industries and mining wastewater. Cyanase enzyme converts cyanate into CO2 and NH3 in a bicarbonate-dependent reaction. At low cyanate concentrations, the endogenous plant cyanases play a vital role in cyanate detoxification. However, such cyanate biodegradation system is probably insufficient due to the excess cyanate concentrations at contaminated sites. In this study, we have transferred the activity of the cyanobacterial cyanase into Arabidopsis thaliana plants in order to enhance plant resistance against cyanate toxicity...
March 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28334407/organismal-and-spatial-partitioning-of-energy-and-macronutrient-transformations-within-a-hypersaline-mat
#5
Jennifer M Mobberley, Stephen R Lindemann, Hans C Bernstein, James J Moran, Ryan S Renslow, Jerome Babauta, Dehong Hu, Haluk Beyenal, William C Nelson
Phototrophic mat communities are model ecosystems for studying energy cycling and elemental transformations because complete biogeochemical cycles occur over millimeter-to-centimeter scales. Characterization of energy and nutrient capture within hypersaline phototrophic mats has focused on specific processes and organisms, however little is known about community-wide distribution of and linkages between these processes. To investigate energy and macronutrient capture and flow through a structured community, the spatial and organismal distribution of metabolic functions within a compact hypersaline mat community from Hot Lake have been broadly elucidated through species-resolved metagenomics and geochemical, microbial diversity, and metabolic gradient measurements...
March 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28334116/spatial-and-temporal-variability-in-the-nitrogen-cyclers-of-hypereutrophic-lake-taihu
#6
Lauren E Krausfeldt, Xiangming Tang, Jodie van de Kamp, Guang Gao, Levente Bodrossy, Gregory L Boyer, Steven W Wilhelm
Harmful cyanobacterial blooms (cyanoHABs) are a major threat to freshwater ecosystems worldwide. Evidence suggests that both nitrogen and phosphorus are important nutrients in the development and proliferation of blooms, yet much less is known about nitrogen cycling dynamics in these systems. To assess the potential nitrogen cycling function of the cyanoHAB community, surface water samples were collected in Lake Tai (Taihu), China over a 5-month bloom event in 2014. The expression of six nitrogen cycling genes (nifH, hzsA, nxrB, nrfA, amoA, nosZ) was surveyed using a targeted microarray with probes designed to provide phylogenetic information...
February 23, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28331161/isolation-of-cyanobacterial-mutants-exhibiting-growth-defects-under-microoxic-conditions-by-transposon-tagging-mutagenesis-of-synechocystis-sp-pcc-6803
#7
Kazuki Terauchi, Riho Sobue, Yuho Furutani, Rina Aoki, Yuichi Fujita
Cyanobacteria are photosynthetic prokaryotes that perform oxygenic photosynthesis by extracting electrons from water, with the generation of oxygen as a byproduct. Cyanobacteria use oxygen not only for respiration to produce energy in the dark but also for biosynthesis of various metabolites, such as heme and chlorophyll. Oxygen levels dynamically fluctuate in the field environments, from hyperoxic at daytime to almost anaerobic at night. Thus, adaptation to anaerobiosis should be important for cyanobacteria to survive in low-oxygen and anaerobic environments...
March 22, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/28330987/architecture-and-mechanism-of-the-central-gear-in-an-ancient-molecular-timer
#8
REVIEW
Martin Egli
Molecular clocks are the product of natural selection in organisms from bacteria to human and their appearance early in evolution such as in the prokaryotic cyanobacterium Synechococcus elongatus suggests that these timers served a crucial role in genetic fitness. Thus, a clock allows cyanobacteria relying on photosynthesis and nitrogen fixation to temporally space the two processes and avoid exposure of nitrogenase carrying out fixation to high levels of oxygen produced during photosynthesis. Fascinating properties of molecular clocks are the long time constant, their precision and temperature compensation...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28330144/upcot-an-integrated-pipeline-tool-for-clustering-upstream-dna-sequences-of-orthologous-genes-in-prokaryotic-genomes
#9
P V Parvati Sai Arun, Jogadhenu S S Prakash
UpCoT is a pipeline tool developed by automating the series of steps involved in prediction of cis-regulatory elements. UpCoT generates orthologs for each gene in target genome using bi-directional best blast hit against the reference genomes, then identifies potential orthologous transcriptional units using intergenic distance. Finally it generates the FASTA files containing upstream sequences of orthologous transcriptional units of each gene in target genome. The inputs of UpCoT are protein sequence files (*...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28323299/cyanobacterial-nitrogenases-phylogenetic-diversity-regulation-and-functional-predictions
#10
Alberto A Esteves-Ferreira, João Henrique Frota Cavalcanti, Marcelo Gomes Marçal Vieira Vaz, Luna V Alvarenga, Adriano Nunes-Nesi, Wagner L Araújo
Cyanobacteria is a remarkable group of prokaryotic photosynthetic microorganisms, with several genera capable of fixing atmospheric nitrogen (N2) and presenting a wide range of morphologies. Although the nitrogenase complex is not present in all cyanobacterial taxa, it is spread across several cyanobacterial strains. The nitrogenase complex has also a high theoretical potential for biofuel production, since H2 is a by-product produced during N2 fixation. In this review we discuss the significance of a relatively wide variety of cell morphologies and metabolic strategies that allow spatial and temporal separation of N2 fixation from photosynthesis in cyanobacteria...
March 20, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28319393/natural-abenquines-and-their-synthetic-analogues-exert-algicidal-activity-against-bloom-forming-cyanobacteria
#11
Amalyn Nain-Perez, Luiz Cláudio Almeida Barbosa, Célia Regina Álvares Maltha, Giuseppe Forlani
Abenquines are natural quinones, produced by some Streptomycetes, showing the ability to inhibit cyanobacterial growth in the 1 to 100 μM range. To further elucidate their biological significance, the synthesis of several analogues (4f-h, 5a-h) allowed us to identify some steric and electronic requirements for bioactivity. Replacing the acetyl by a benzoyl group in the quinone core and also changing the amino acid moiety with ethylpyrimidinyl or ethylpyrrolidinyl groups resulted in analogues 25-fold more potent than the natural abenquines...
March 20, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28319100/metagenomic-discovery-of-polybrominated-diphenyl-ether-biosynthesis-by-marine-sponges
#12
Vinayak Agarwal, Jessica M Blanton, Sheila Podell, Arnaud Taton, Michelle A Schorn, Julia Busch, Zhenjian Lin, Eric W Schmidt, Paul R Jensen, Valerie J Paul, Jason S Biggs, James W Golden, Eric E Allen, Bradley S Moore
Naturally produced polybrominated diphenyl ethers (PBDEs) pervade the marine environment and structurally resemble toxic man-made brominated flame retardants. PBDEs bioaccumulate in marine animals and are likely transferred to the human food chain. However, the biogenic basis for PBDE production in one of their most prolific sources, marine sponges of the order Dysideidae, remains unidentified. Here, we report the discovery of PBDE biosynthetic gene clusters within sponge-microbiome-associated cyanobacterial endosymbionts through the use of an unbiased metagenome-mining approach...
March 20, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28318304/sequential-role-of-biosorption-and-biodegradation-in-rapid-removal-degradation-and-utilization-of-methyl-parathion-as-a-phosphate-source-by-a-new-cyanobacterial-isolate-scytonema-sp-bhus-5
#13
Balkrishna Tiwari, Savita Singh, Sindhunath Chakraborty, Ekta Verma, Arun Kumar Mishra
A new isolate of genus Scytonema distinct from its closest relative Scytonema hofmanni was found efficient in removal and degradation of organophosphorus pesticide methyl parathion (MP). The cyanobacterial isolate was also capable to utilize the phosphorous present in the methyl parathion following its degradation which was evident from the increase in growth (chlorophyll content), biomass, protein content and total phosphorous in comparison to cyanobacterium grown in phosphate deficient cultures. The rapid removal of MP by the cyanobacterium during initial 6 hours of incubation was defined by the pseudo second order of biosorption kinetics model, which has indicated the involvement of chemosorption in initial removal of pesticide...
March 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28318016/the-transporter-synpam71-is-located-in-the-plasma-membrane-and-thylakoids-and-mediates-manganese-tolerance-in-synechocystis-pcc6803
#14
Chiara Gandini, Sidsel Birkelund Schmidt, Søren Husted, Anja Schneider, Dario Leister
Manganese (Mn) is an essential constituent of photosystem II (PSII) and therefore indispensable for oxygenic photosynthesis. Very little is known about how Mn is transported, delivered and retained in photosynthetic cells. Recently, the thylakoid-localized transporter PAM71 has been linked to chloroplast Mn homeostasis in Arabidopsis thaliana. Here, we characterize the function of its homolog in Synechocystis (SynPAM71). We used a loss-of-function line (ΔSynPAM71), wild-type (WT) cells exposed to Mn stress and strains expressing a tagged variant of SynPAM71 to characterize the role of SynPAM71 in cyanobacterial Mn homeostasis...
March 20, 2017: New Phytologist
https://www.readbyqxmd.com/read/28303404/phylogenetic-analysis-of-proteins-involved-in-the-stringent-response-in-plant-cells
#15
Doshun Ito, Yuta Ihara, Hidenori Nishihara, Shinji Masuda
The nucleotide (p)ppGpp is a second messenger that controls the stringent response in bacteria. The stringent response modifies expression of a large number of genes and metabolic processes and allows bacteria to survive under fluctuating environmental conditions. Recent genome sequencing analyses have revealed that genes responsible for the stringent response are also found in plants. These include (p)ppGpp synthases and hydrolases, RelA/SpoT homologs (RSHs), and the pppGpp-specific phosphatase GppA/Ppx. However, phylogenetic relationship between enzymes involved in bacterial and plant stringent responses is as yet generally unclear...
March 16, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28302852/structures-of-the-cyanobacterial-circadian-oscillator-frozen-in-a-fully-assembled-state
#16
Joost Snijder, Jan M Schuller, Anika Wiegard, Philip Lössl, Nicolas Schmelling, Ilka M Axmann, Jürgen M Plitzko, Friedrich Förster, Albert J R Heck
Cyanobacteria have a robust circadian oscillator, known as the Kai system. Reconstituted from the purified protein components KaiC, KaiB, and KaiA, it can tick autonomously in the presence of adenosine 5'-triphosphate (ATP). The KaiC hexamers enter a natural 24-hour reaction cycle of autophosphorylation and assembly with KaiB and KaiA in numerous diverse forms. We describe the preparation of stoichiometrically well-defined assemblies of KaiCB and KaiCBA, as monitored by native mass spectrometry, allowing for a structural characterization by single-particle cryo-electron microscopy and mass spectrometry...
March 17, 2017: Science
https://www.readbyqxmd.com/read/28302170/identification-of-residues-important-for-the-activity-of-aldehyde-deformylating-oxygenase-through-investigation-into-the-structure-activity-relationship
#17
Qing Wang, Luyao Bao, Chenjun Jia, Mei Li, Jian-Jun Li, Xuefeng Lu
BACKGROUND: Aldehyde-deformylating oxygenase (ADO) is a key enzyme involved in the biosynthetic pathway of fatty alk(a/e)nes in cyanobacteria. However, cADO (cyanobacterial ADO) showed extreme low activity with the k cat value below 1 min(-1), which would limit its application in biofuel production. To identify the activity related key residues of cADO is urgently required. RESULTS: The amino acid residues which might affect cADO activity were identified based on the crystal structures and sequence alignment of cADOs, including the residues close to the di-iron center (Tyr39, Arg62, Gln110, Tyr122, Asp143 of cADO-1593), the protein surface (Trp 178 of cADO-1593), and those involved in two important hydrogen bonds (Gln49, Asn123 of cADO-1593, and Asp49, Asn123 of cADO-sll0208) and in the oligopeptide whose conformation changed in the absence of the di-iron center (Leu146, Asn149, Phe150 of cADO-1593, and Thr146, Leu148, Tyr150 of cADO-sll0208)...
March 16, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28301562/diversity-and-community-structure-of-cyanobacteria-and-other-microbes-in-recycling-irrigation-reservoirs
#18
Ping Kong, Patricia Richardson, Chuanxue Hong
Recycling irrigation reservoirs (RIRs) are emerging aquatic environments of global significance to crop production, water conservation and environmental sustainability. This study characterized the diversity and population structure of cyanobacteria and other detected microbes in water samples from eight RIRs and one adjacent runoff-free stream at three ornamental crop nurseries in eastern (VA1 and VA3) and central (VA2) Virginia after cloning and sequencing the 16S rRNA gene targeting cyanobacteria and chloroplast of eukaryotic phytoplankton...
2017: PloS One
https://www.readbyqxmd.com/read/28299571/impacts-of-potassium-ferrate-vi-on-the-growth-and-organic-matter-accumulation-production-and-structural-changes-in-the-cyanobacterium-microcystis-aeruginosa
#19
Shu-Yu Liu, Jingling Xu, Wen-Li Chen, Berthold E David, Minghong Wu, Fang Ma
Cyanobacterial blooms generated by nutrient addition into aquatic systems pose serious risks to ecosystems and human health. Though there are established chemical, physical, and biological means of eradication, more efficient and environmentally friendly measures are desired. This study investigates the effect of potassium ferrate(VI) on the growth and intracellular and extracellular organic matter accumulations of the cyanobacterium Microcystis aeruginosa. Cultures were inoculated with three separate concentrations of potassium ferrate(VI) (3, 15, 30 mg L(-1)) and monitored by measuring chlorophyll-a (Chl-a) and intracellular/extracellular dissolved organic carbon...
March 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28295163/cyanobacterial-carbon-metabolism-fluxome-plasticity-and-oxygen-dependence
#20
Ni Wan, Drew M DeLorenzo, Lian He, Le You, Cheryl M Immethun, George Wang, Edward E K Baidoo, Whitney Hollinshead, Jay D Keasling, Tae Seok Moon, Yinjie J Tang
Synechocystis sp. strain PCC 6803 has been widely used as a photo-biorefinery chassis. Based on its genome annotation, this species contains a complete TCA cycle, an Embden-Meyerhof-Parnas pathway (EMPP), an oxidative pentose phosphate pathway (OPPP), and an Entner-Doudoroff pathway (EDP). To evaluate how Synechocystis 6803 catabolizes glucose under heterotrophic conditions, we performed (13) C metabolic flux analysis, metabolite pool size analysis, gene knockouts, and heterologous expressions. The results revealed a cyclic mode of flux through the OPPP...
March 14, 2017: Biotechnology and Bioengineering
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