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https://www.readbyqxmd.com/read/29793056/high-myristic-acid-content-in-the-cyanobacterium-cyanothece-sp-pcc-8801-results-from-substrate-specificity-of-lysophosphatidic-acid-acyltransferase
#1
Masakazu Saito, Kaichiro Endo, Koichi Kobayashi, Mai Watanabe, Masahiko Ikeuchi, Akio Murakami, Norio Murata, Hajime Wada
Analysis of fatty acids from the cyanobacterium Cyanothece sp. PCC 8801 revealed that this species contained high levels of myristic acid (14:0) and linoleic acid in its glycerolipids, with minor contributions from palmitic acid (16:0), stearic acid, and oleic acid. The level of 14:0 relative to total fatty acids reached nearly 50%. This 14:0 fatty acid was esterified primarily to the sn-2 position of the glycerol moiety of glycerolipids. This characteristic is unique because, in most of the cyanobacterial strains, the sn-2 position is esterified exclusively with C16 fatty acids, generally 16:0...
May 21, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29791446/nitrogen-limitation-toxin-synthesis-potential-and-toxicity-of-cyanobacterial-populations-in-lake-okeechobee-and-the-st-lucie-river-estuary-florida-during-the-2016-state-of-emergency-event
#2
Benjamin J Kramer, Timothy W Davis, Kevin A Meyer, Barry H Rosen, Jennifer A Goleski, Gregory J Dick, Genesok Oh, Christopher J Gobler
Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to declare a state of emergency. This study reports on measurements and nutrient amendment experiments performed in this freshwater-estuarine ecosystem (salinity 0-25 PSU) during and after the bloom...
2018: PloS One
https://www.readbyqxmd.com/read/29791035/uncovering-cryptic-diversity-of-lyngbya-the-new-tropical-marine-cyanobacterial-genus-dapis-oscillatoriales
#3
Niclas Engene, Ana Tronholm, Valerie J Paul
Cyanobacteria comprise an extraordinarily diverse group of microorganisms and, as revealed by increasing molecular information, this biodiversity is even more extensive than previously estimated. In this sense, the cyanobacterial genus Lyngbya is a highly polyphyletic group composed of many unrelated taxa with morphological similarities. In this study, the new genus Dapis was erected from the genus Lyngbya, based on a combined molecular, chemical, and morphological approach. Herein, two new species of cyanobacteria are described: D...
May 23, 2018: Journal of Phycology
https://www.readbyqxmd.com/read/29783168/fluorescence-probes-for-real-time-remote-cyanobacteria-monitoring-a-review-of-challenges-and-opportunities
#4
REVIEW
Edoardo Bertone, Michele A Burford, David P Hamilton
In recent years, there has been a widespread deployment of submersible fluorescence sensors by water utilities. They are used to measure diagnostic pigments and estimate algae and cyanobacteria abundance in near real-time. Despite being useful and promising tools, operators and decision-makers often rely on the data provided by these probes without a full understanding of their limitations. As a result, this may lead to wrong and misleading estimations which, in turn, means that researchers and technicians distrust these sensors...
May 10, 2018: Water Research
https://www.readbyqxmd.com/read/29782156/combining-high-throughput-sequencing-of-sedadna-and-traditional-palaeolimnological-techniques-to-infer-historical-trends-in-cyanobacterial-communities
#5
Timothy J Tse, Lorne E Doig, Song Tang, Xiaohui Zhang, Weimin Sun, Steve B Wiseman, Cindy Xin Feng, Hongling Liu, John P Giesy, Markus Hecker, Paul D Jones
Freshwaters worldwide are under increasing pressure from anthropogenic activities and changing climate. Unfortunately, many inland waters lack sufficient long-term monitoring to assess environmental trends. Analysis of sedimentary ancient DNA (sedaDNA) is emerging as a means to reconstruct the past occurrence of microbial communities of inland waters. The purpose of this study was to assess a combination of high-throughput sequencing (16S rRNA) of sedaDNA and traditional palaeolimnological analyses to explore multidecadal relationships among cyanobacterial community composition, the potential for cyanotoxin production and palaeoenvironmental proxies...
May 21, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29780373/regulation-mechanism-mediated-by-trans-encoded-srna-nc117-in-short-chain-alcohols-tolerance-in-synechocystis-sp-pcc-6803
#6
Yanqi Bi, Guangsheng Pei, Tao Sun, Zixi Chen, Lei Chen, Weiwen Zhang
Microbial small RNAs (sRNAs) play essential roles against many stress conditions in cyanobacteria. However, little is known on their regulatory mechanisms on biofuels tolerance. In our previous sRNA analysis, a trans -encoded sRNA Nc117 was found involved in the tolerance to ethanol and 1-butanol in Synechocystis sp. PCC 6803. However, its functional mechanism is yet to be determined. In this study, functional characterization of sRNA Nc117 was performed. Briefly, the exact length of the trans -encoded sRNA Nc117 was determined to be 102 nucleotides using 3' RACE, and the positive regulation of Nc117 on short chain alcohols tolerance was further confirmed...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29779660/in-vitro-analysis-of-cyanobacterial-nonheme-iron-dependent-aliphatic-halogenases-welo5-and-ambo5
#7
Xinyu Liu
Aliphatic carbon-halogen (C-X) bonds are prevalent in modern pharmaceuticals and bioactive natural products. Three distinct chemical strategies are known in Nature to generate these structural motifs. The first is via the nucleophilic substitution at a prefunctionalized electrophilic carbon center with a halide anion (X- ), known for the S-adenosyl-l-methionine-dependent halogenases. The second is via the electrophilic activation of an alkene or its equivalent by a halenium ion (X+ ) donor, known for the haloperoxidases and flavin-dependent halogenases...
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29779654/radical-s-adenosylmethionine-peptide-epimerases-detection-of-activity-and-characterization-of-d-amino-acid-products
#8
Brandon I Morinaka, Anna L Vagstad, Jörn Piel
The identification of the polytheonamide (poy) gene cluster led to the discovery of the enzyme PoyD, a member of the radical S-adenosylmethionine superfamily capable of introducing d-amino acids into a ribosomally synthesized peptide. This enzyme was used as a starting point to identify additional radical S-adenosylmethionine peptide epimerases in other cyanobacterial genomes, which show different epimerization patterns compared to PoyD. During the course of studying these enzymes by heterologous expression in Escherichia coli, we developed a two-step strategy to (1) detect epimerase activity and (2) localize where epimerization occurs based on an in vivo deuterium labeling strategy...
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29778219/survival-of-cyanobacteria-in-rivers-following-their-release-in-water-from-large-headwater-reservoirs
#9
Nicholas Williamson, Tsuyoshi Kobayashi, David Outhet, Lee C Bowling
Cyanobacterial survival following their release in water from major headwaters reservoirs was compared in five New South Wales rivers. Under low flow conditions, cyanobacterial presence disappeared rapidly with distance downstream in the Cudgegong and Hunter Rivers, whereas the other three rivers were contaminated for at least 300 km. Cyanobacterial survival is likely to be impacted by the geomorphology of each river, especially the extent of gravel riffle reaches (cells striking rocks can destroy them) and by the different turbulent flow conditions it produces within each...
May 2018: Harmful Algae
https://www.readbyqxmd.com/read/29776183/slowdown-of-surface-diffusion-during-early-stages-of-bacterial-colonization
#10
T Vourc'h, H Peerhossaini, J Léopoldès, A Méjean, F Chauvat, C Cassier-Chauvat
We study the surface diffusion of the model cyanobacterium Synechocystis sp. PCC6803 during the incipient stages of cell contact with a glass surface in the dilute regime. We observe a twitching motility with alternating immobile tumble and mobile run periods, resulting in a normal diffusion described by a continuous-time random walk with a coefficient of diffusion D. Surprisingly, D is found to decrease with time down to a plateau. This is observed only when the cyanobacterial cells are able to produce released extracellular polysaccharides, as shown by a comparative study between the wild-type strain and various polysaccharides-depleted mutants...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775927/effects-of-microcystin-lr-on-the-tissue-growth-and-physiological-responses-of-the-aquatic-plant-iris-pseudacorus-l
#11
Naiyu Wang, Can Wang
The release of cyanobacterial toxins during algal bloom has adverse effects on aquatic plants and animals. This study aimed to understand the toxic effects and mechanism of microcystin-LR (MC-LR) on the seedling growth and physiological responses of Iris pseudacorus L. (calamus). After a one-month exposure experiment, the growth and development of the calamus leaves were significantly inhibited, and this inhibitory effect was verified to be concentration dependent. Furthermore, the cell membrane system was damaged, and the photosynthesis was also adversely affected by MC-LR...
April 27, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29775481/widespread-anatoxin-a-detection-in-benthic-cyanobacterial-mats-throughout-a-river-network
#12
Keith Bouma-Gregson, Raphael M Kudela, Mary E Power
Benthic algae fuel summer food webs in many sunlit rivers, and are hotspots for primary and secondary production and biogeochemical cycling. Concerningly, riverine benthic algal assemblages can become dominated by toxic cyanobacteria, threatening water quality and public health. In the Eel River in Northern California, over a dozen dog deaths have been attributed to cyanotoxin poisonings since 2000. During the summers of 2013-2015, we documented spatial and temporal patterns of cyanotoxin concentrations in the watershed, showing widespread distribution of anatoxin-a in benthic cyanobacterial mats...
2018: PloS One
https://www.readbyqxmd.com/read/29774347/effect-of-humic-acid-bacterial-exudates-on-sorption-desorption-interactions-of-90-sr-with-brucite
#13
Hollie Ashworth, Liam Abrahamsen-Mills, Nick Bryan, Lynn Foster, Jonathan R Lloyd, Simon Kellet, Sarah Heath
One of the nuclear fuel storage ponds at Sellafield (United Kingdom) is open to the air, and has contained a significant inventory of corroded magnox fuel and sludge for several decades. As a result, some fission products have also been released into solution. 90Sr is known to constitute a small mass of the radionuclides present in the pond, but due to its solubility and activity, it is at risk of challenging effluent discharge limits. The sludge is predominantly composed of brucite (Mg(OH)2), and organic molecules are known to be present in the pond liquor with occasional algal blooms restricting visibility...
May 18, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29767343/effect-of-artificial-redox-mediators-on-the-photoinduced-oxygen-reduction-by-photosystem-i-complexes
#14
Anastasia Petrova, Mahir Mamedov, Boris Ivanov, Alexey Semenov, Marina Kozuleva
The peculiarities of interaction of cyanobacterial photosystem I with redox mediators 2,6-dichlorophenolindophenol (DCPIP) and N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) were investigated. The higher donor efficiency of the reduced DCPIP form was demonstrated. The oxidized form of DCPIP was shown to be an efficient electron acceptor for terminal iron-sulfur cluster of photosystem I. Likewise methyl viologen, after one-electron reduction, DCPIP transfers an electron to the molecular oxygen. These results were discussed in terms of influence of these interactions on photosystem I reactions with the molecular oxygen and natural electron acceptors...
May 16, 2018: Photosynthesis Research
https://www.readbyqxmd.com/read/29764363/gatc-a-genetic-algorithm-for-gene-tree-construction-under-the-duplication-transfer-loss-model-of-evolution
#15
Emmanuel Noutahi, Nadia El-Mabrouk
BACKGROUND: Several methods have been developed for the accurate reconstruction of gene trees. Some of them use reconciliation with a species tree to correct, a posteriori, errors in gene trees inferred from multiple sequence alignments. Unfortunately the best fit to sequence information can be lost during this process. RESULTS: We describe GATC, a new algorithm for reconstructing a binary gene tree with branch length. GATC returns optimal solutions according to a measure combining both tree likelihood (according to sequence evolution) and a reconciliation score under the Duplication-Transfer-Loss (DTL) model...
May 9, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29763862/hydrogen-peroxide-treatment-promotes-chlorophytes-over-toxic-cyanobacteria-in-a-hyper-eutrophic-aquaculture-pond
#16
Zhen Yang, Riley P Buley, Edna G Fernandez-Figueroa, Mario U G Barros, Soorya Rajendran, Alan E Wilson
Controlling blooms of toxigenic phytoplankton, including cyanobacteria, is a high priority for managers of aquatic systems that are used for drinking water, recreation, and aquaculture production. Although a variety of treatment approaches exist, hydrogen peroxide (H2 O2 ) has the potential to be an effective and ecofriendly algaecide given that this compound may select against cyanobacteria while not producing harmful residues. To broadly evaluate the effectiveness of H2 O2 on toxigenic phytoplankton, we tested multiple concentrations of H2 O2 on (1) four cyanobacterial cultures, including filamentous Anabaena, Cylindrospermopsis, and Planktothrix, and unicellular Microcystis, in a 5-day laboratory experiment and (2) a dense cyanobacterial bloom in a 7-day field experiment conducted in a nutrient-rich aquaculture pond...
May 12, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29756682/design-strategy-of-multi-electron-transfer-catalysts-based-on-a-bioinformatic-analysis-of-oxygen-evolution-and-reduction-enzymes
#17
Hideshi Ooka, Kazuhito Hashimoto, Ryuhei Nakamura
Understanding the design strategy of photosynthetic and respiratory enzymes is important to develop efficient artificial catalysts for oxygen evolution and reduction reactions. Here, based on a bioinformatic analysis of cyanobacterial oxygen evolution and reduction enzymes (photosystem II: PS II and cytochrome c oxidase: COX, respectively), the gene encoding the catalytic D1 subunit of PS II was found to be expressed individually across 38 phylogenetically diverse strains, which is in contrast to the operon structure of the genes encoding major COX subunits...
May 14, 2018: Molecular Informatics
https://www.readbyqxmd.com/read/29756453/bacterial-membrane-depolarization-linked-fuel-cell-potential-burst-as-signal-for-selective-detection-of-alcohol
#18
Sharbani Kaushik, Pranab Goswami
The biosensing application of microbial fuel cell (MFC) is hampered by its long response time, poor selectivity, and technical difficulty in developing portable devices. Herein, a novel signal form for rapid detection of ethanol was generated in a photosynthetic MFC (PMFC). First, a dual chambered (100 ml each) PMFC was fabricated by using cyanobacteria based anode and abiotic cathode and its performance was examined for detection of alcohols. A graphene-based nano-biocomposite matrix was layered over graphite anode to support cyanobacterial biofilm growth and to facilitate electron transfer...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29755429/cyanobacterial-community-composition-and-bacteria-bacteria-interactions-promote-the-stable-occurrence-of-particle-associated-bacteria
#19
Jason N Woodhouse, Jennifer Ziegler, Hans-Peter Grossart, Brett A Neilan
Within meso/eutrophic freshwater ecosystems the dominance of cyanobacterial blooms during summer months has substantial impacts on ecosystem function with the production of toxins and subsequent induction of hypoxia altering food web structures and biogeochemical cycles. Cyanobacterial aggregates are extensively colonized by heterotrophic bacteria that provide the cyanobacteria with key nutrients and contribute towards remineralisation of organic matter. Here we sampled from five sites within a shallow eutrophic pond over a 6 months period, relating changes in the abundance of particle-associated heterotrophic taxa to phytoplankton abundance, toxin gene copies and physiochemical properties...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29755206/epilithic-chamaesiphon-synechococcales-cyanobacteria-species-in-mountain-streams-of-the-alps-interspecific-differences-in-photo-physiological-traits
#20
Siegfried Aigner, Klaus Herburger, Andreas Holzinger, Ulf Karsten
Many alpine streams inhabit conspicuous epilithic biofilms on pebbles and rocks that are formed by members of the cyanobacterial genus Chamaesiphon (Synechococcales). In the Austrian Alps, some Chamaesiphon species can even overgrow up to 70% of the surface of river rocks, and hence they must play an important but still unstudied ecological role in the organic matter flux. Since photo-biological traits have not been investigated so far, photosynthetic features, pigments, and UV-sunscreen compounds were studied in three Chamaesiphon morphospecies ( C...
2018: Journal of Applied Phycology
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