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https://www.readbyqxmd.com/read/28634470/the-dark-side-of-the-mushroom-spring-microbial-mat-life-in-the-shadow-of-chlorophototrophs-ii-metabolic-functions-of-abundant-community-members-predicted-from-metagenomic-analyses
#1
Vera Thiel, Michael Hügler, David M Ward, Donald A Bryant
Microbial mat communities in the effluent channels of Octopus and Mushroom Springs within the Lower Geyser Basin of Yellowstone National Park have been extensively characterized. Previous studies have focused on the chlorophototrophic organisms of the phyla Cyanobacteria and Chloroflexi. However, the diversity and metabolic functions of the other portion of the community in the microoxic/anoxic region of the mat are poorly understood. We recently described the diverse but extremely uneven microbial assemblage in the undermat of Mushroom Spring based on 16S rRNA amplicon sequences, which was dominated by Roseiflexus members, filamentous anoxygenic chlorophototrophs...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28630913/an-innovative-biologic-system-for-photon-powered-myocardium-in-the-ischemic-heart
#2
Jeffrey E Cohen, Andrew B Goldstone, Michael J Paulsen, Yasuhiro Shudo, Amanda N Steele, Bryan B Edwards, Jay B Patel, John W MacArthur, Michael S Hopkins, Casey E Burnett, Kevin J Jaatinen, Akshara D Thakore, Justin M Farry, Vi N Truong, Alexandra T Bourdillon, Lyndsay M Stapleton, Anahita Eskandari, Alexander S Fairman, William Hiesinger, Tatiana V Esipova, William L Patrick, Keven Ji, Judith A Shizuru, Y Joseph Woo
Coronary artery disease is one of the most common causes of death and disability, afflicting more than 15 million Americans. Although pharmacological advances and revascularization techniques have decreased mortality, many survivors will eventually succumb to heart failure secondary to the residual microvascular perfusion deficit that remains after revascularization. We present a novel system that rescues the myocardium from acute ischemia, using photosynthesis through intramyocardial delivery of the cyanobacterium Synechococcus elongatus...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630351/evolutionary-radiation-of-lanthipeptides-in-marine-cyanobacteria
#3
Andres Cubillos-Ruiz, Jessie W Berta-Thompson, Jamie W Becker, Wilfred A van der Donk, Sallie W Chisholm
Lanthipeptides are ribosomally derived peptide secondary metabolites that undergo extensive posttranslational modification. Prochlorosins are a group of lanthipeptides produced by certain strains of the ubiquitous marine picocyanobacteria Prochlorococcus and Synechococcus Unlike other lanthipeptide-producing bacteria, picocyanobacteria use an unprecedented mechanism of substrate promiscuity for the production of numerous and diverse lanthipeptides using a single lanthionine synthetase. Through a cross-scale analysis of prochlorosin biosynthesis genes-from genomes to oceanic populations-we show that marine picocyanobacteria have the collective capacity to encode thousands of different cyclic peptides, few of which would display similar ring topologies...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28628991/bacterial-community-composition-in-rainwater-associated-with-synoptic-weather-in-an-area-downwind-of-the-asian-continent
#4
Wei Hu, Kotaro Murata, Yuka Horikawa, Ayumi Naganuma, Daizhou Zhang
Bacteria are abundant in atmospheric waters and can be disseminated by precipitation to the surface of the Earth, potentially influencing ecosystems, public health and climate. However, data on bacterial communities in rainwater, especially on the association with weather, are very limited. In this study, rainwater was collected at the coastal city Kumamoto, southwestern Japan, in 2015. The bacterial communities in fourteen samples were identified using 16S rRNA sequencing and compared according to the rain types at the synoptic scale, i...
June 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28622287/a-niche-for-cyanobacteria-producing-chlorophyll-f-within-a-microbial-mat
#5
Satoshi Ohkubo, Hideaki Miyashita
Acquisition of additional photosynthetic pigments enables photosynthetic organisms to survive in particular niches. To reveal the ecological significance of chlorophyll (Chl) f, we investigated the distribution of Chl and cyanobacteria within two microbial mats. In a 7-mm-thick microbial mat beneath the running water of the Nakabusa hot spring, Japan, Chl f was only distributed 4.0-6.5 mm below the surface, where the intensity of far-red light (FR) was higher than that of photosynthetically active radiation (PAR)...
June 16, 2017: ISME Journal
https://www.readbyqxmd.com/read/28618153/cascading-influence-of-inorganic-nitrogen-sources-on-dom-production-composition-lability-and-microbial-community-structure-in-the-open-ocean
#6
S J Goldberg, C E Nelson, D A Viviani, C N Shulse, M J Church
Nitrogen frequently limits oceanic photosynthesis and the availability of inorganic nitrogen sources in the surface oceans is shifting with global change. We evaluated the potential for abrupt increases in inorganic N sources to induce cascading effects on DOM and microbial communities in the surface ocean. We collected water from 5 m depth in the central North Pacific and amended duplicate 20 L polycarbonate carboys with nitrate or ammonium, tracking planktonic carbon fixation, DOM production, DOM composition and microbial community structure responses over 1 week relative to controls...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28616951/direct-characterization-of-the-native-structure-and-mechanics-of-cyanobacterial-carboxysomes
#7
Matthew Faulkner, Jorge Rodriguez-Ramos, Gregory F Dykes, Siân V Owen, Selene Casella, Deborah M Simpson, Robert J Beynon, Lu-Ning Liu
Carboxysomes are proteinaceous organelles that play essential roles in enhancing carbon fixation in cyanobacteria and some proteobacteria. These self-assembling organelles encapsulate Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) and carbonic anhydrase using a protein shell structurally resembling an icosahedral viral capsid. The protein shell serves as a physical barrier to protect enzymes from the cytosol and a selectively permeable membrane to mediate transport of enzyme substrates and products...
June 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28611738/identification-of-cyanobacteria-in-a-eutrophic-coastal-lagoon-on-the-southern-baltic-coast
#8
Martin Albrecht, Thomas Pröschold, Rhena Schumann
Cyanobacteria are found worldwide in various habitats. Members of the picocyanobacteria genera Synechococcus and Prochlorococcus dominate in oligotrophic ocean waters. Other picocyanobacteria dominate in eutrophic fresh or brackish waters. Usually, these are morphologically determined as species of the order Chroococcales/clade B2. The phytoplankton of a shallow, eutrophic brackish lagoon was investigated. Phytoplankton was dominated by Aphanothece-like morphospecies year-round for more than 20 years, along a trophy and salinity gradient...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28600876/rerouting-of-carbon-flux-in-a-glycogen-mutant-of-cyanobacteria-assessed-via-isotopically-non-stationary-13-c-metabolic-flux-analysis
#9
John I Hendry, Charulata Prasannan, Fangfang Ma, K Benedikt Möllers, Damini Jaiswal, Madhuri Digmurti, Doug K Allen, Niels-Ulrik Frigaard, Santanu Dasgupta, Pramod P Wangikar
Cyanobacteria, which constitute a quantitatively dominant phylum, have attracted attention in biofuel applications due to favorable physiological characteristics, high photosynthetic efficiency and amenability to genetic manipulations. However, quantitative aspects of cyanobacterial metabolism have received limited attention. In the present study, we have performed isotopically non-stationary (13) C metabolic flux analysis (INST-(13) C-MFA) to analyze rerouting of carbon in a glycogen synthase deficient mutant strain (glgA-I glgA-II) of the model cyanobacterium Synechococcus sp...
June 10, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28595872/distribution-and-diversity-of-marine-picocyanobacteria-community-targeting-of-prochlorococcus-ecotypes-in-winter-conditions-southern-adriatic-sea
#10
Ivana Babić, Ines Petrić, Sunčica Bosak, Hrvoje Mihanović, Iris Dupčić Radić, Zrinka Ljubešić
Adriatic, the northernmost part of the Mediterranean Sea, due its oligotrophy, topography, and hydrology dynamics, and complex circulation patterns, was suggested as an important study site for rapid climatology impacts. Its southern part is mainly oligotrophic and dominated by picophytoplankton, with cyanobacteria as main representatives. Diversity and distribution patterns of different Prochlorococcus ecotypes were investigated by molecular tools and flow cytometry during the winter convection event in the southern Adriatic (BIOTA winter cruise; February/March 2015)...
June 5, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28592992/streamlining-recombination-mediated-genetic-engineering-by-validating-three-neutral-integration-sites-in-synechococcus-sp-pcc-7002
#11
Anne Ilse Maria Vogel, Rahmi Lale, Martin Frank Hohmann-Marriott
BACKGROUND: Synechococcus sp. PCC 7002 (henceforth Synechococcus) is developing into a powerful synthetic biology chassis. In order to streamline the integration of genes into the Synechococcus chromosome, validation of neutral integration sites with optimization of the DNA transformation protocol parameters is necessary. Availability of BioBrick-compatible integration modules is desirable to further simplifying chromosomal integrations. RESULTS: We designed three BioBrick-compatible genetic modules, each targeting a separate neutral integration site, A2842, A0935, and A0159, with varying length of homologous region, spanning from 100 to 800 nt...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28585390/type-4-pili-are-dispensable-for-biofilm-development-in-the-cyanobacterium-synechococcus-elongatus
#12
Elad Nagar, Shaul Zilberman, Eleonora Sendersky, Ryan Simkovsky, Eyal Shimoni, Diana Gershtein, Moshe Herzberg, Susan S Golden, Rakefet Schwarz
The hair-like cell appendages denoted as type IV pili are crucial for biofilm formation in diverse eubacteria. The protein complex responsible for type IV pilus assembly is homologous with the type II protein secretion complex. In the cyanobacterium Synechococcus elongatus PCC 7942, the gene Synpcc7942_2071 encodes an ATPase homologue of type II/type IV systems. Here we report that inactivation of Synpcc7942_2071 strongly affected the suite of proteins present in the extracellular milieu (exo-proteome) and eliminated pili observable by electron microscopy...
June 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28580015/removal-of-the-product-from-the-culture-medium-strongly-enhances-free-fatty-acid-production-by-genetically-engineered-synechococcus-elongatus
#13
Akihiro Kato, Nobuyuki Takatani, Kazutaka Ikeda, Shin-Ichi Maeda, Tatsuo Omata
BACKGROUND: Cyanobacterial mutants engineered for production of free fatty acids (FFAs) secrete the products to the medium and hence are thought to be useful for biofuel production. The dAS1T mutant constructed from Synechococcus elongatus PCC 7942 has indeed a large capacity of FFA production, which is comparable to that of triacylglycerol production in green algae, but the yield of secreted FFAs is low because the cells accumulate most of the FFAs intracellularly and eventually die of their toxicity...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28574452/two-synechococcus-genes-two-different-effects-on-cyanophage-infection
#14
Ayalla Fedida, Debbie Lindell
Synechococcus is an abundant marine cyanobacterium that significantly contributes to primary production. Lytic phages are thought to have a major impact on cyanobacterial population dynamics and evolution. Previously, an investigation of the transcriptional response of three Synechococcus strains to infection by the T4-like cyanomyovirus, Syn9, revealed that while the transcript levels of the vast majority of host genes declined soon after infection, those for some genes increased or remained stable. In order to assess the role of two such host-response genes during infection, we inactivated them in Synechococcus sp...
June 2, 2017: Viruses
https://www.readbyqxmd.com/read/28551744/endophytic-bacterial-and-fungal-communities-transmitted-from-cotyledons-and-germs-in-peanut-arachis-hypogaea-l-sprouts
#15
Yali Huang, Zaoyuan Kuang, Zujun Deng, Ren Zhang, Lixiang Cao
Seed-borne endophytes could be transmitted into sprouts. Whether this happened in peanuts and the difference between microbial taxa in peanut germs and cotyledons remain unknown. In this research, Illumina-based sequencing was employed to investigate the microbial taxa in peanut germs, cotyledons, and sprouts. Sulfur-oxidizing bacteria was isolated and inoculated into peanut sprouts, and then, the growth of peanut seedlings was measured. The results illustrated that diverse bacteria and fungi were detected in peanut germs, cotyledons, and sprouts...
May 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28550166/lysine-acetylome-analysis-reveals-photosystem-ii-manganese-stabilizing-protein-acetylation-is-involved-in-negative-regulation-of-oxygen-evolution-in-model-cyanobacterium-synechococcus-sp-pcc-7002
#16
Zhuo Chen, Guiying Zhang, Mingkun Yang, Tao Li, Feng Ge, Jindong Zhao
Nϵ-Acetylation of lysine residues represents a frequently occurring post-translational modification widespread in bacteria that plays vital roles in regulating bacterial physiology and metabolism. However, the role of lysine acetylation in cyanobacteria remains unclear, presenting a hurdle to in-depth functional study of this post-translational modification. Here, we report the lysine acetylome of Synechococcus sp. PCC 7002 (hereafter Synechococcus) using peptide prefractionation, immunoaffinity enrichment, and coupling with high-precision liquid chromatography-tandem mass spectrometry analysis...
May 26, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28549253/synechococcus-nidulans-from-a-thermoelectric-coal-power-plant-as-a-potential-co2-mitigation-in-culture-medium-containing-flue-gas-wastes
#17
Jessica Hartwig Duarte, Jorge Alberto Vieira Costa
This study evaluated the intermittent addition of coal flue gas wastes (CO2, SO2, NO and ash) into a Synechococcus nidulans LEB 115 cultivation in terms of growth parameters, CO2 biofixation and biomass characterization. The microalga from a coal thermoelectric plant showed tolerance up to 200ppm SO2 and NO, with a maximum specific growth rate of 0.18±0.03d(-)(1). The addition of thermal coal ash to the cultivation increased the Synechococcus nidulans LEB 115 maximum cell growth by approximately 1.3 times...
May 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28544262/synthesis-theoretical-studies-and-effect-on-the-photosynthetic-electron-transport-of-trifluoromethyl-arylamides
#18
Róbson Ricardo Teixeira, Marcus Vinícius de Andrade Barros, Gustavo Costa Bressan, Raoni Pais Siqueira, Fabíola Suelen Dos Santos, Michele Bertazzini, Rudolf Kiralj, Márcia Miguel Castro Ferreira, Giuseppe Forlani
BACKGROUND: The photosynthetic apparatus is targeted by various herbicides, including several amides such as diuron and linuron. Considering the need for the discovery of new active ingredients to cope with weed resistance, the synthesis of a series of trifluoromethyl aryl amides is herein described whose inhibitory properties were assessed in vitro on the photosynthetic electron transport chain, and in vivo on the growth of a model cyanobacterial strain. Theoretical studies were also carried out...
May 25, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28533966/microbiome-patterns-across-the-gastrointestinal-tract-of-the-rabbitfish-siganus-fuscescens
#19
Shaun Nielsen, Jackson Wilkes Walburn, Adriana Vergés, Torsten Thomas, Suhelen Egan
Most of our knowledge regarding the biodiversity of gut microbes comes from terrestrial organisms or marine species of economic value, with less emphasis on ecologically important species. Here we investigate the bacterial composition associated with the gut of Siganus fuscescens, a rabbitfish that plays an important ecological role in coastal ecosystems by consuming seaweeds. Members of Firmicutes, Bacteroidetes and delta-Proteobacteria were among the dominant taxa across samples taken from the contents and the walls (sites) of the midgut and hindgut (location)...
2017: PeerJ
https://www.readbyqxmd.com/read/28520412/identification-of-the-ferredoxin-binding-site-of-a-ferredoxin-dependent-cyanobacterial-nitrate-reductase
#20
Anurag P Srivastava, Emily P Hardy, James P Allen, Brian J Vaccaro, Michael K Johnson, David B Knaff
An in silico model for the 1:1 ferredoxin (Fd)/nitrate reductase (NR) complex, using the known structure of Synechocystis sp. PCC 6803 Fd and the in silico model of Synechococcus sp. PCC 7942 NR, is used to map the interaction sites that define the interface between Fd and NR. To test the electrostatic interactions predicted by the model complex, five positively charged NR amino acids (Arg43, Arg46, Arg197, Lys201, and Lys614) and a negatively charged amino acid (Glu219) were altered using site-directed mutagenesis and characterized by activity measurements, metal analysis, and electron paramagnetic resonance (EPR) studies...
May 26, 2017: Biochemistry
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