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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
#1
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/28303404/phylogenetic-analysis-of-proteins-involved-in-the-stringent-response-in-plant-cells
#2
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/28303312/neutral-evolution-and-dispersal-limitation-produce-biogeographic-patterns-in-microcystis-aeruginosa-populations-of-lake-systems
#3
Sahar Shirani, Ferdi L Hellweger
Molecular observations reveal substantial biogeographic patterns of cyanobacteria within systems of connected lakes. An important question is the relative role of environmental selection and neutral processes in the biogeography of these systems. Here, we quantify the effect of genetic drift and dispersal limitation by simulating individual cyanobacteria cells using an agent-based model (ABM). In the model, cells grow (divide), die, and migrate between lakes. Each cell has a full genome that is subject to neutral mutation (i...
March 16, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28303150/development-of-synebrick-vectors-as-a-synthetic-biology-platform-for-gene-expression-in-synechococcus-elongatus-pcc-7942
#4
Wook Jin Kim, Sun-Mi Lee, Youngsoon Um, Sang Jun Sim, Han Min Woo
Cyanobacteria are oxygenic photosynthetic prokaryotes that are able to assimilate CO2 using solar energy and water. Metabolic engineering of cyanobacteria has suggested the possibility of direct CO2 conversion to value-added chemicals. However, engineering of cyanobacteria has been limited due to the lack of various genetic tools for expression and control of multiple genes to reconstruct metabolic pathways for biochemicals from CO2. Thus, we developed SyneBrick vectors as a synthetic biology platform for gene expression in Synechococcus elongatus PCC 7942 as a model cyanobacterium...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28299588/chemical-cues-which-include-amino-acids-mediate-species-specific-feeding-behavior-in-invasive-filter-feeding-bigheaded-carps
#5
Aaron W Claus, Peter W Sorensen
This study tested whether and how dissolved chemicals might assist food recognition in two filter-feeding fishes, the silver (Hypophthalmichthys molitrix) and the bighead carp (H. nobilis). These species evolved in Asia, are now invasive in the Mississippi River, and feed voraciously on microparticles including plankton. The food habits and biology of these carps are broadly similar to many filter-feeding fish, none of whose chemical ecology has been examined. We conducted five experiments. First, we demonstrated that buccal-pharngeal pumping (BPP), a behavior in which fish pump water into their buccal cavities, is responsible for sampling food: BPP activity in both silver and bighead carps was low and increased nearly 25-fold after exposure to a filtrate of a planktonic food mixture (P < 0...
March 15, 2017: Journal of Chemical Ecology
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
#6
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/28296888/a-thermodynamically-consistent-model-of-the-post-translational-kai-circadian-clock
#7
Joris Paijmans, David K Lubensky, Pieter Rein Ten Wolde
The principal pacemaker of the circadian clock of the cyanobacterium S. elongatus is a protein phosphorylation cycle consisting of three proteins, KaiA, KaiB and KaiC. KaiC forms a homohexamer, with each monomer consisting of two domains, CI and CII. Both domains can bind and hydrolyze ATP, but only the CII domain can be phosphorylated, at two residues, in a well-defined sequence. While this system has been studied extensively, how the clock is driven thermodynamically has remained elusive. Inspired by recent experimental observations and building on ideas from previous mathematical models, we present a new, thermodynamically consistent, statistical-mechanical model of the clock...
March 15, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28295918/the-intrinsically-disordered-inhibitor-of-glutamine-synthetase-is-a-functional-protein-with-random-coil-like-pka-values
#8
Concetta Cozza, José L Neira, Francisco J Florencio, M Isabel Muro-Pastor, Bruno Rizzuti
The sequential action of glutamine synthetase (GS) and glutamate synthase (GOGAT) in cyanobacteria allows the incorporation of ammonium into carbon skeletons. In the cyanobacterium Synechocystis sp. PCC 6803, the activity of GS is modulated by the interaction with proteins, which include a 65-residue-long intrinsically disordered protein (IDP), the inactivating factor IF7. This interaction is regulated by the presence of charged residues in both IF7 and GS. In order to understand how charged amino acids can affect the binding of an IDP with its target, and to provide clues on electrostatic interactions in disordered states of proteins, we measured the pKa values of all IF7 acidic groups (Glu32, Glu36, Glu38, Asp40, Asp58, and Ser65, the backbone C-terminus) at 100 mM NaCl concentration, by using NMR spectroscopy...
March 15, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28294609/biseokeaniamides-a-b-and-c-sterol-o-acyltransferase-inhibitors-from-an-okeania-sp-marine-cyanobacterium
#9
Arihiro Iwasaki, Takato Tadenuma, Shimpei Sumimoto, Taichi Ohshiro, Kaori Ozaki, Keisuke Kobayashi, Toshiaki Teruya, Hiroshi Tomoda, Kiyotake Suenaga
Biseokeaniamides A, B, and C (1-3), structurally novel sterol O-acyltransferase (SOAT) inhibitors, were isolated from an Okeania sp. marine cyanobacterium. Their structures were elucidated by spectroscopic analyses and degradation reactions. Biseokeaniamide B (2) exhibited moderate cytotoxicity against human HeLa cancer cells, and compounds 1-3 inhibited both SOAT1 and SOAT2, not only at an enzyme level but also at a cellular level. Biseokeaniamides (1-3) are the first linear lipopeptides that have been shown to exhibit SOAT-inhibitory activity...
March 15, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28289984/in-silico-characterization-and-transcriptomic-analysis-of-nif-family-genes-from-anabaena-sp-pcc7120
#10
Shilpi Singh, Alok Kumar Shrivastava
In silico approaches in conjunction with morphology, nitrogenase activity, and qRT-PCR explore the impact of selected abiotic stressor such as arsenic, salt, cadmium, copper, and butachlor on nitrogen fixing (nif family) genes of diazotrophic cyanobacterium Anabaena sp. PCC7120. A total of 19 nif genes are present within the Anabaena genome that is involved in the process of nitrogen fixation. Docking studies revealed the interaction between these nif gene-encoded proteins and the selected abiotic stressors which were further validated through decreased heterocyst frequency, fragmentation of filaments, and downregulation of nitrogenase activity under these stresses indicating towards their toxic impact on nitrogen fixation potential of filamentous cyanobacterium Anabaena sp...
March 14, 2017: Cell Biology and Toxicology
https://www.readbyqxmd.com/read/28289730/indirect-interspecies-regulation-transcriptional-and-physiological-responses-of-a-cyanobacterium-to-heterotrophic-partnership
#11
Hans C Bernstein, Ryan S McClure, Vera Thiel, Natalie C Sadler, Young-Mo Kim, William B Chrisler, Eric A Hill, Donald A Bryant, Margaret F Romine, Janet K Jansson, Jim K Fredrickson, Alexander S Beliaev
The mechanisms by which microbes interact in communities remain poorly understood. Here, we interrogated specific interactions between photoautotrophic and heterotrophic members of a model consortium to infer mechanisms that mediate metabolic coupling and acclimation to partnership. This binary consortium was composed of a cyanobacterium, Thermosynechococcus elongatus BP-1, which supported growth of an obligate aerobic heterotroph, Meiothermus ruber strain A, by providing organic carbon, O2, and reduced nitrogen...
March 2017: MSystems
https://www.readbyqxmd.com/read/28286552/systematic-and-functional-identification-of-small-non-coding-rnas-associated-with-exogenous-biofuel-stress-in-cyanobacterium-synechocystis-sp-pcc-6803
#12
Guangsheng Pei, Tao Sun, Shuo Chen, Lei Chen, Weiwen Zhang
BACKGROUND: The unicellular model cyanobacterium Synechocystis sp. PCC 6803 is considered a promising microbial chassis for biofuel production. However, its low tolerance to biofuel toxicity limits its potential application. Although recent studies showed that bacterial small RNAs (sRNAs) play important roles in regulating cellular processes in response to various stresses, the role of sRNAs in resisting exogenous biofuels is yet to be determined. RESULTS: Based on genome-wide sRNA sequencing combined with systematic analysis of previous transcriptomic and proteomic data under the same biofuel or environmental perturbations, we report the identification of 133 trans-encoded sRNA transcripts with high-resolution mapping of sRNAs in Synechocystis, including 23 novel sRNAs identified for the first time...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28286551/systems-analysis-of-ethanol-production-in-the-genetically-engineered-cyanobacterium-synechococcus-sp-pcc-7002
#13
Joachim Kopka, Stefanie Schmidt, Frederik Dethloff, Nadin Pade, Susanne Berendt, Marco Schottkowski, Nico Martin, Ulf Dühring, Ekaterina Kuchmina, Heike Enke, Dan Kramer, Annegret Wilde, Martin Hagemann, Alexandra Friedrich
BACKGROUND: Future sustainable energy production can be achieved using mass cultures of photoautotrophic microorganisms, which are engineered to synthesize valuable products directly from CO2 and sunlight. As cyanobacteria can be cultivated in large scale on non-arable land, these phototrophic bacteria have become attractive organisms for production of biofuels. Synechococcus sp. PCC 7002, one of the cyanobacterial model organisms, provides many attractive properties for biofuel production such as tolerance of seawater and high light intensities...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28284152/characterization-of-zinc-stress-response-in-cyanobacterium-synechococcus-sp-iu-625
#14
Robert Newby, Lee H Lee, Jose L Perez, Xin Tao, Tinchun Chu
The ability of cyanobacteria to survive many environmental stress factors is a testament to their resilience in nature. Of these environmental stress factors, overexposure to zinc is important to study since excessive zinc intake can be a severe hazard. Zinc toxicity in freshwater has been demonstrated to affects organisms such as invertebrates, algae and cyanobacteria. Cyanobacteria which possess increased resistance to zinc have been isolated. It is therefore important to elucidate the mechanism of survival and response to determine what factors allow their survival; as well as any remediation implications they may have...
March 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28281671/visualizing-adsorption-of-cyanophage-p-ssp7-onto-marine-prochlorococcus
#15
Kazuyoshi Murata, Qinfen Zhang, Jesús Gerardo Galaz-Montoya, Caroline Fu, Maureen L Coleman, Marcia S Osburne, Michael F Schmid, Matthew B Sullivan, Sallie W Chisholm, Wah Chiu
Marine cyanobacteria perform roughly a quarter of global carbon fixation, and cyanophages that infect them liberate some of this carbon during infection and cell lysis. Studies of the cyanobacterium Prochlorococcus MED4 and its associated cyanophage P-SSP7 have revealed complex gene expression dynamics once infection has begun, but the initial cyanophage-host interactions remain poorly understood. Here, we used single particle cryo-electron tomography (cryo-ET) to investigate cyanophage-host interactions in this model system, based on 170 cyanophage-to-host adsorption events...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28281066/effects-of-microcystin-producing-and-microcystin-freemicrocystis-aeruginosa-on-enzyme-activity-and-nutrient-content-in-the-rotifer-brachionus-calyciflorus
#16
Ye Liang, Yuqi Su, Kai Ouyang, Xinglan Chen, Jiaxin Yang
Toxic cyanobacterial blooms disrupt freshwater recreation and adversely affect zooplankton. The freshwater cyanobacterium Microcystis aeruginosa produces microcystins, which are compounds toxic to rotifers. This study evaluated the effects of M. aeruginosa on enzyme activity and nutrient content in the rotifer Brachionus calyciflorus Pallas. The rotifers were fed on Chlorella pyrenoidosa, Scenedesmus obliquus, microcystin-producing and microcystin-free M. aeruginosa alone, and mixtures of green algae combined with toxic and nontoxic cyanobacteria, respectively...
March 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28277971/distinct-light-stress-and-nutrient-dependent-regulation-of-multiple-tryptophan-rich-sensory-protein-tspo-genes-in-the-cyanobacterium-fremyella-diplosiphon
#17
Andrea W U Busch, Beronda L Montgomery
The cyanobacterium Fremyella diplosiphon possesses 3 genes encoding homologs of the tryptophan-rich sensory protein (TSPO). TSPO proteins are membrane proteins implicated in stress responses across a range of organisms from bacteria to humans. Diverse TSPO proteins appear to generally bind tetrapyrrole ligands. Previously, we reported that one of these homologs, FdTSPO1, is involved in salt-, osmotic- and oxidative stress responses in F. diplosiphon. Here, we show distinct regulation of cellular mRNA levels of all 3 FdTSPO homologs by different abiotic stresses...
March 4, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28270809/functional-diversity-of-transcriptional-regulators-in-the-cyanobacterium-synechocystis-sp-pcc-6803
#18
Mengliang Shi, Xiaoqing Zhang, Guangsheng Pei, Lei Chen, Weiwen Zhang
Functions of transcriptional regulators (TRs) are still poorly understood in the model cyanobacterium Synechocystis sp. PCC 6803. To address the issue, we constructed knockout mutants for 32 putative TR-encoding genes of Synechocystis, and comparatively analyzed their phenotypes under autotrophic growth condition and metabolic profiles using liquid chromatography-mass spectrometry-based metabolomics. The results showed that only four mutants of TR genes, sll1872 (lytR), slr0741 (phoU), slr0395 (ntcB), and slr1871 (pirR), showed differential growth patterns in BG11 medium when compared with the wild type; however, in spite of no growth difference observed for the remaining TR mutants, metabolomic profiling showed that they were different at the metabolite level, suggesting significant functional diversity of TRs in Synechocystis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28270686/two-new-sacrolide-class-oxylipins-from-the-edible-cyanobacterium-aphanothece-sacrum
#19
Naoya Oku, Sayaka Hana, Miyako Matsumoto, Kohsuke Yonejima, Keijiroh Tansei, Yasuhiro Isogai, Yasuhiro Igarashi
No abstract text is available yet for this article.
March 8, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28270586/emergent-phototactic-responses-of-cyanobacteria-under-complex-light-regimes
#20
Rosanna Man Wah Chau, Devaki Bhaya, Kerwyn Casey Huang
Environmental cues can stimulate a variety of single-cell responses, as well as collective behaviors that emerge within a bacterial community. These responses require signal integration and transduction, which can occur on a variety of time scales and often involve feedback between processes, for example, between growth and motility. Here, we investigate the dynamics of responses of the phototactic, unicellular cyanobacterium Synechocystis sp. PCC6803 to complex light inputs that simulate the natural environments that cells typically encounter...
March 7, 2017: MBio
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