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https://www.readbyqxmd.com/read/29162705/three-dimensional-superresolution-imaging-of-the-ftsz-ring-during-cell-division-of-the-cyanobacterium-prochlorococcus
#1
Riyue Liu, Yaxin Liu, Shichang Liu, Ying Wang, Kim Li, Ning Li, Daiying Xu, Qinglu Zeng
Superresolution imaging has revealed subcellular structures and protein interactions in many organisms. However, superresolution microscopy with lateral resolution better than 100 nm has not been achieved in photosynthetic cells due to the interference of a high-autofluorescence background. Here, we developed a photobleaching method to effectively reduce the autofluorescence of cyanobacterial and plant cells. We achieved lateral resolution of ~10 nm with stochastic optical reconstruction microscopy (STORM) in the sphere-shaped cyanobacterium Prochlorococcus and the flowering plant Arabidopsis thaliana During the cell cycle of Prochlorococcus, we characterized the three-dimensional (3D) organization of the cell division protein FtsZ, which forms a ring structure at the division site and is important for cytokinesis of bacteria and chloroplasts...
November 21, 2017: MBio
https://www.readbyqxmd.com/read/29161470/resequencing-of-a-mutant-bearing-an-iron-starvation-recovery-phenotype-defines-slr1658-as-a-new-player-in-the-regulatory-network-of-a-model-cyanobacterium
#2
Hagit Zer, Ketty Margulis, Jens Georg, Yoram Shotland, Gergana Kostova, Laure Sultan, Wolfgang R Hess, Nir Keren
Photosynthetic microorganisms encounter an erratic nutrient environment characterized by periods of iron limitation and sufficiency. Surviving in such an environment requires mechanisms for handling these transitions. Our study identified a regulatory system involved in the process of recovery from iron limitation in cyanobacteria. We set out to study the role of bacterioferritin co-migratory proteins during transitions in iron bioavailability in the cyanobacterium Synechocystis sp. PCC 6803 using knockout strains coupled with physiological and biochemical measurements...
November 21, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29159995/multiple-abc-glucoside-transporters-mediate-sugar-stimulated-growth-in-the-heterocyst-forming-cyanobacterium-anabaena-sp-strain-pcc-7120
#3
Mercedes Nieves-Morión, Enrique Flores
Cyanobacteria are generally capable of photoautotrophic growth and are widely distributed on Earth. The model filamentous, heterocyst-forming strain Anabaena sp. PCC 7120 has been long considered a strict photoautotroph but is now known to be able to assimilate fructose. We have previously described two components of ABC glucoside uptake transporters from Anabaena that are involved in uptake of the sucrose analog esculin: GlsC (a nucleotide-binding domain subunit [NBD]) and GlsP (a transmembrane component [TMD])...
November 21, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29156281/dry-hot-stress-significantly-reduced-the-nitrogenase-activity-of-epiphytic-cyanolichen
#4
Shuai Liu, Wenyao Liu, Xianmeng Shi, Su Li, Tao Hu, Liang Song, Chuansheng Wu
Nitrogen (N) fixed by epiphytic cyanolichens (i.e. lichens that contain cyanobacterial symbionts) is thought to be the most important resource of this nutrient in some natural forest ecosystems. Although a great deal of work has been carried out to evaluate the biomass of this group as well as its contribution to ecosystem N budgets, empirical studies are needed to confirm the N input responses by cyanolichens under climate change conditions (dry-hot stress) as well as to determine the factors that control this process...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29154789/biosynthesis-of-microcystin-hepatotoxins-in-the-cyanobacterial-genus-fischerella
#5
Karina Heck, Danillo O Alvarenga, Tania K Shishido, Alessandro M Varani, Felipe A Dörr, Ernani Pinto, Leo Rouhiainen, Jouni Jokela, Kaarina Sivonen, Marli F Fiore
Microcystins (MCs) are serine/threonine phosphatase inhibitors synthesized by several members of the phylum Cyanobacteria. Mining the draft genome sequence of the nostocalean MC-producing Fischerella sp. strain CENA161 led to the identification of three contigs containing mcy genes. Subsequent PCR and Sanger sequencing allowed the assembling of its complete biosynthetic mcy gene cluster with 55,016 bases in length. The cluster encoding ten genes (mcyA-J) with a central bidirectional promoter was organized in a similar manner as found in other genera of nostocalean cyanobacteria...
November 14, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29151643/cyanobacteria-nostoc-punctiforme-from-abyssal-benthos-of-lake-baikal-unique-ecology-and-metabolic-potential
#6
Irina Tikhonova, Anton Kuzmin, Diana Deeva, Ekaterina Sorokovikova, Sergey Potapov, Anna Lomakina, Olga Belykh
A strain of Nostoc punctiforme was isolated from the bottom sediments of the oil seep at Gorevoy Utes (Central Baikal) at a depth of 890 m. The Baikal strain is highly similar (98-99%) to the N. punctiforme CCAP 1453/9 strain and the typical N. punctiforme PCC 73103 strain isolated from soil ecotopes. Based on the analysis of functional genes and mass spectrometry data, we determined that the strain can produce bioactive peptides and polyketides, but does not produce known cyanobacterial toxins, saxitoxin or its analogs, or microcystins...
December 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/29151571/host-genotype-dependent-gut-microbiota-drives-zooplankton-tolerance-to-toxic-cyanobacteria
#7
Emilie Macke, Martijn Callens, Luc De Meester, Ellen Decaestecker
The gut microbiota impacts many aspects of its host's biology, and is increasingly considered as a key factor mediating performance of host individuals in continuously changing environments. Here we use gut microbiota transplants to show that both host genotype and gut microbiota mediate tolerance to toxic cyanobacteria in the freshwater crustacean Daphnia magna. Interclonal variation in tolerance to cyanobacteria disappears when Daphnia are made germ-free and inoculated with an identical microbial inoculum...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29149675/evaluation-of-potassium-ferrate-as-an-alternative-disinfectant-on-cyanobacteria-inactivation-and-associated-toxin-fate-in-various-waters
#8
Jiajia Fan, Bo-Hung Lin, Che-Wei Chang, Yuqing Zhang, Tsair-Fuh Lin
Potassium ferrate (K2FeO4) is an effective oxidant that may be used as a pre- or post-oxidant in the purification of source water with cyanobacterial issues. To provide a better basis for the application of this oxidant during water treatment processes, the impacts of K2FeO4 on the cell viability of Microcystis aeruginosa and the fate of associated microcystins (MCs) were investigated in various water matrices. The results showed that a water matrix can significantly affect the effectiveness of K2FeO4 on cyanobacteria inactivation...
November 9, 2017: Water Research
https://www.readbyqxmd.com/read/29145606/-prokaryotic-pathway-is-not-prokaryotic-non-cyanobacterial-origin-of-the-chloroplast-lipid-biosynthetic-pathway-revealed-by-comprehensive-phylogenomic-analysis
#9
Naoki Sato, Koichiro Awai
Lipid biosynthesis within the chloroplast, or more generally plastids, was conventionally called "prokaryotic pathway", which produces glycerolipids bearing C18 acids at the sn-1 position and C16 acids at the sn-2 position, as in cyanobacteria such as Anabaena and Synechocystis. This positional specificity is determined during the synthesis of phosphatidate, which is a precursor to diacylglycerol, the acceptor of galactose for the synthesis of galactolipids. The first acylation at sn-1 is catalyzed by glycerol-3-phosphate acyltransferase (GPAT or GPT), whereas the second acylation at sn-2 is performed by lysophosphatidate acyltransferase (LPAAT, AGPAT or PlsC)...
November 14, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29142439/screening-of-norharmane-from-seven-cyanobacteria-by-high-performance-liquid-chromatography
#10
Tunay Karan, Ramazan Erenler
Background: Cyanobacteria, including pharmaceutically and medicinally valuable compounds attract the great attention lately. Norharmane (9H-pyrido (3,4-b) indole found in some cyanobacteria revealed a great number of biological effects. Objective: Seven cyanobacteria were isolated and identified from Yesilirmak River and Gaziosmanpasa University Campus to determine the norharmane content. Materials and Methods: Cyanobacteria collected from Tokat, Turkey were isolated and identified by morphologically...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29138260/chloroplast-division-protein-arc3-acts-on-ftsz2-by-preventing-filament-bundling-and-enhancing-gtpase-activity
#11
Rahamthulla S Shaik, Min Woo Sung, Stanislav Vitha, Andreas Holzenburg
Chloroplasts evolved from cyanobacterial endosymbiotic ancestors and their division is a complex process initiated by assembly of cytoskeletal FtsZ proteins into a ring structure at the division site (Z-ring). The cyanobacterial Z-ring positioning system (MinCDE proteins) is also conserved in chloroplasts except that MinC was lost and replaced by the eukaryotic ARC3. Both MinC and ARC3 act as negative regulators of FtsZ assembly, but ARC3 bears little sequence similarity with MinC. Here, light scattering assays, co-sedimentation, GTPase assay and transmission electron microscopy (TEM) in conjunction with single particle analysis have been used to elucidate the structure of ARC3 and its effect on its main target in chloroplast division: FtsZ2...
November 14, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/29137991/spectrally-decomposed-dark-to-light-transitions-in-a-psi-deficient-mutant-of-synechocystis-sp-pcc-6803
#12
Alonso M Acuña, Pascal van Alphen, Filipe Branco Dos Santos, Rienk van Grondelle, Klaas J Hellingwerf, Ivo H M van Stokkum
Cyanobacterial thylakoid membranes are known to host photosynthetic and respiratory complexes. This hampers a straight forward interpretation of the highly dynamic fluorescence originating from photosynthetic units. The present study focuses on dark-to-light transitions in whole cells of a PSI-deficient mutant of the cyanobacterium Synechocystis sp. PCC 6803. The time-dependent cellular fluorescence spectrum has been measured, while having previously exposed the cells to different conditions that affect respiratory activity...
November 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29132031/effects-of-microcystis-on-development-of-early-life-stage-japanese-medaka-oryzias-latipes-comparative-toxicity-of-natural-blooms-cultured-microcystis-and-microcystin-lr
#13
Spencer R Saraf, Amy Frenkel, Matthew J Harke, Jennifer G Jankowiak, Christopher J Gobler, Anne E McElroy
Freshwater cyanobacterial harmful algal blooms (CyanoHABs) caused by algae in the genus Microcystis have been increasing in frequency and severity in recent decades. Microcystis blooms threaten aquatic organisms through effects associated with the rapid increase of biomass and the production of the hepatotoxin microcystin (MC) by toxic strains. Among fish, effects of blooms are likely to be more severe for early life stages, and physiological impacts on this life stage could significantly impact recruitment and fish populations...
November 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29124873/exposure-to-predicted-precipitation-patterns-decrease-population-size-and-alter-community-structure-of-cyanobacteria-in-biological-soil-crusts-from-the-chihuahuan-desert
#14
Vanessa Moreira Câmara Fernandes, Náthali Maria Machado de Lima, Daniel Roush, Jennifer Rudgers, Scott L Collins, Ferran Garcia-Pichel
Cyanobacteria typically colonize the surface of arid soils, building biological soil crust (biocrusts) that provide a variety of ecosystem benefits, ranging from fertilization to stabilization against erosion. We investigated how future scenarios in precipitation anticipated for the Northern Chihuahuan Desert affected abundance and composition of biocrust cyanobacteria in two grassland ecosystems. Scenarios included a decrease in precipitation and a delay of monsoon rainfall. After three years, both treatments negatively affected cyanobacteria, although the effects of monsoon delay were milder than those of decreased precipitation...
November 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29124450/stepwise-strategy-for-monitoring-toxic-cyanobacterial-blooms-in-lentic-water-bodies
#15
Inês P E Macário, Bruno B Castro, Isabel M S Nunes, Cristina Pizarro, Carla Coelho, Fernando Gonçalves, Daniela R de Figueiredo
Climate change has been causing the increase in frequency, severity, and duration of harmful algal blooms, which makes the establishment of water management strategies indispensable. For cyanobacteria, several methods are currently used in monitoring programs. However, these methods are time-consuming and require specialists, and results are usually not provided within an adequate timeframe for taking timely mitigation actions. This work proposes a strategy for a faster, easier, and more cost-effective monitoring of cyanobacterial blooms, using a stepwise approach based on fluorometric determination of phycocyanin at an early stage...
November 9, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29122244/bloom-dynamics-and-chemical-defenses-of-benthic-cyanobacteria-in-the-indian-river-lagoon-florida
#16
Jennifer M Sneed, Theresa Meickle, Niclas Engene, Sherry Reed, Sarath Gunasekera, Valerie J Paul
Cyanobacterial blooms are predicted to become more prominent in the future as a result of increasing seawater temperatures and the continued addition of nutrients to coastal waters. Many benthic marine cyanobacteria have potent chemical defenses that protect them from top down pressures and contribute to the persistence of blooms. Blooms of benthic cyanobacteria have been observed along the coast of Florida and within the Indian River Lagoon (IRL), a biodiverse estuary system that spans 250km along Florida's east coast...
November 2017: Harmful Algae
https://www.readbyqxmd.com/read/29122241/variation-within-and-between-cyanobacterial-species-and-strains-affects-competition-implications-for-phytoplankton-modelling
#17
Man Xiao, Matthew P Adams, Anusuya Willis, Michele A Burford, Katherine R O'Brien
Cyanobacteria Microcystis aeruginosa and Cylindrospermopsis raciborskii are two harmful species which co-occur and successively dominate in freshwaters globally. Within-species strain variability affects cyanobacterial population responses to environmental conditions, and it is unclear which species/strain would dominate under different environmental conditions. This study applied a Monte Carlo approach to a phytoplankton dynamic growth model to identify how growth variability of multiple strains of these two species affects their competition...
November 2017: Harmful Algae
https://www.readbyqxmd.com/read/29122239/early-warning-of-limit-exceeding-concentrations-of-cyanobacteria-and-cyanotoxins-in-drinking-water-reservoirs-by-inferential-modelling
#18
Friedrich Recknagel, Philip T Orr, Michael Bartkow, Annelie Swanepoel, Hongqing Cao
An early warning scheme is proposed that runs ensembles of inferential models for predicting the cyanobacterial population dynamics and cyanotoxin concentrations in drinking water reservoirs on a diel basis driven by in situ sonde water quality data. When the 10- to 30-day-ahead predicted concentrations of cyanobacteria cells or cyanotoxins exceed pre-defined limit values, an early warning automatically activates an action plan considering in-lake control, e.g. intermittent mixing and ad hoc water treatment in water works, respectively...
November 2017: Harmful Algae
https://www.readbyqxmd.com/read/29119488/combining-hydrogen-peroxide-addition-with-sunlight-regulation-to-control-algal-blooms
#19
Qichao Zhou, Lin Li, Licheng Huang, Liangliang Guo, Lirong Song
The concentration, light conditions during treatment, and the number of hydrogen peroxide (H2O2) additions as well as the H2O2 treatment combined with subsequent shading to control algal blooms were studied in the field (Lake Dianchi, China). The cyanobacterial stress and injury due to H2O2 were dose dependent, and the control effectiveness and degradation of H2O2 were better and faster under full light than under shading. However, H2O2 was only able to control a bloom for a short time, so it may have promoted the recovery of algae and allowed the biomass to rebound due to the growth of eukaryotic algae...
November 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29118438/substrate-specificity-and-allosteric-regulation-of-a-d-lactate-dehydrogenase-from-a-unicellular-cyanobacterium-are-altered-by-an-amino-acid-substitution
#20
Shoki Ito, Masahiro Takeya, Takashi Osanai
Lactate/lactic acid is an important chemical compound for the manufacturing of bioplastics. The unicellular cyanobacterium Synechocystis sp. PCC 6803 can produce lactate from carbon dioxide and possesses D-lactate dehydrogenase (Ddh). Here, we performed a biochemical analysis of the Ddh from this cyanobacterium (SyDdh) using recombinant proteins. SyDdh was classified into a cyanobacterial clade similar to those from Gram-negative bacteria, although it was distinct from them. SyDdh can use both pyruvate and oxaloacetate as a substrate and is activated by fructose-1,6-bisphosphate and repressed by divalent cations...
November 8, 2017: Scientific Reports
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