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https://www.readbyqxmd.com/read/28813016/a-novel-high-mannose-specific-lectin-from-the-green-alga-halimeda-renschii-exhibits-a-potent-anti-influenza-virus-activity-through-high-affinity-binding-to-the-viral-hemagglutinin
#1
Jinmin Mu, Makoto Hirayama, Yuichiro Sato, Kinjiro Morimoto, Kanji Hori
We have isolated a novel lectin, named HRL40 from the green alga Halimeda renschii. In hemagglutination-inhibition test and oligosaccharide-binding experiment with 29 pyridylaminated oligosaccharides, HRL40 exhibited a strict binding specificity for high-mannose N-glycans having an exposed (α1-3) mannose residue in the D2 arm of branched mannosides, and did not have an affinity for monosaccharides and other oligosaccharides examined, including complex N-glycans, an N-glycan core pentasaccharide, and oligosaccharides from glycolipids...
August 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28808107/structure-of-psb29-thf1-and-its-association-with-the-ftsh-protease-complex-involved-in-photosystem-ii-repair-in-cyanobacteria
#2
Martina Bec Ková, Jianfeng Yu, Vendula Krynická, Amanda Kozlo, Shengxi Shao, Peter Koník, Josef Komenda, James W Murray, Peter J Nixon
One strategy for enhancing photosynthesis in crop plants is to improve their ability to repair photosystem II (PSII) in response to irreversible damage by light. Despite the pivotal role of thylakoid-embedded FtsH protease complexes in the selective degradation of PSII subunits during repair, little is known about the factors involved in regulating FtsH expression. Here we show using the cyanobacterium Synechocystis sp. PCC 6803 that the Psb29 subunit, originally identified as a minor component of His-tagged PSII preparations, physically interacts with FtsH complexes in vivo and is required for normal accumulation of the FtsH2/FtsH3 hetero-oligomeric complex involved in PSII repair...
September 26, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28808099/enhancing-crop-plant-photosynthesis-by-introducing-novel-genetic-diversity
#3
REVIEW
Marcel Dann, Dario Leister
Although some elements of the photosynthetic light reactions might appear to be ideal, the overall efficiency of light conversion to biomass has not been optimized during evolution. Because crop plants are depleted of genetic diversity for photosynthesis, efforts to enhance its efficiency with respect to light conversion to yield must generate new variation. In principle, three sources of natural variation are available: (i) rare diversity within extant higher plant species, (ii) photosynthetic variants from algae, and (iii) reconstruction of no longer extant types of plant photosynthesis...
September 26, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28808098/overexpression-of-plastid-terminal-oxidase-in-synechocystis-sp-pcc-6803-alters-cellular-redox-state
#4
Kathleen Feilke, Ghada Ajlani, Anja Krieger-Liszkay
Cyanobacteria are the most ancient organisms performing oxygenic photosynthesis, and they are the ancestors of plant plastids. All plastids contain the plastid terminal oxidase (PTOX), while only certain cyanobacteria contain PTOX. Many putative functions have been discussed for PTOX in higher plants including a photoprotective role during abiotic stresses like high light, salinity and extreme temperatures. Since PTOX oxidizes PQH2 and reduces oxygen to water, it is thought to protect against photo-oxidative damage by removing excess electrons from the plastoquinone (PQ) pool...
September 26, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28808007/early-photosynthetic-eukaryotes-inhabited-low-salinity-habitats
#5
Patricia Sánchez-Baracaldo, John A Raven, Davide Pisani, Andrew H Knoll
The early evolutionary history of the chloroplast lineage remains an open question. It is widely accepted that the endosymbiosis that established the chloroplast lineage in eukaryotes can be traced back to a single event, in which a cyanobacterium was incorporated into a protistan host. It is still unclear, however, which Cyanobacteria are most closely related to the chloroplast, when the plastid lineage first evolved, and in what habitats this endosymbiotic event occurred. We present phylogenomic and molecular clock analyses, including data from cyanobacterial and chloroplast genomes using a Bayesian approach, with the aim of estimating the age for the primary endosymbiotic event, the ages of crown groups for photosynthetic eukaryotes, and the independent incorporation of a cyanobacterial endosymbiont by Paulinella Our analyses include both broad taxon sampling (119 taxa) and 18 fossil calibrations across all Cyanobacteria and photosynthetic eukaryotes...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28803778/an-unstable-singularity-underlies-stochastic-phasing-of-the-circadian-clock-in-individual-cyanobacterial-cells
#6
Siting Gan, Erin K O'Shea
The endogenous circadian clock synchronizes with environmental time by appropriately resetting its phase in response to external cues. Of note, some resetting stimuli induce attenuated oscillations of clock output, which has been observed at the population-level in several organisms and in studies of individual humans. To investigate what is happening in individual cellular clocks, we studied the unicellular cyanobacterium S. elongatus. By measuring its phase-resetting responses to temperature changes, we found that population-level arrhythmicity occurs when certain perturbations cause stochastic phases of oscillations in individual cells...
August 9, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28802140/cell-density-dependence-of-microcystis-aeruginosa-responses-to-copper-algaecide-concentrations-implications-for-microcystin-lr-release
#7
Ciera M Kinley, Kyla J Iwinski, Maas Hendrikse, Tyler D Geer, John H Rodgers
Along with mechanistic models, predictions of exposure-response relationships for copper are often derived from laboratory toxicity experiments with standardized experimental exposures and conditions. For predictions of copper toxicity to algae, cell density is a critical factor often overlooked. For pulse exposures of copper-based algaecides in aquatic systems, cell density can significantly influence copper sorbed by the algal population, and consequent responses. A cyanobacterium, Microcystis aeruginosa, was exposed to a copper-based algaecide over a range of cell densities to model the density-dependence of exposures, and effects on microcystin-LR (MC-LR) release...
August 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28799935/effects-of-toxic-microcystis-genotypes-on-natural-colony-formation-and-mechanism-involved
#8
Xiangdong Bi, Wei Dai, Shulin Zhang, Shaojie Dong, Dajuan Zhang
The cyanobacterium Microcystis occurs as colonies of different sizes with varying abundance of toxic genotypes versus non-toxic genotypes under natural conditions. To investigate the effects of toxic Microcystis genotypes on natural colony formation, samples collected from the mainstream of Haihe River from July to October 2015 were sieved into four colony classes with sizes of <8 μm, 8-20 μm, 20-90 μm and >90 μm. Each colony size class was analyzed for the proportion of toxic Microcystis genotypes, and microcystins (MCs) cellular production of toxic genotypes...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28797629/molecular-and-morphological-survey-of-saxitoxin-producing-cyanobacterium-dolichospermum-circinale-anabaena-circinalis-isolated-from-geographically-distinct-regions-of-australia
#9
Joao P A Pereyra, Paul M D'Agostino, Rabia Mazmouz, Jason N Woodhouse, Russell Pickford, Ian Jameson, Brett A Neilan
The cyanobacterium Dolichospermum circinale (formerly Anabaena circinalis) is responsible for neurotoxic saxitoxin-producing blooms in Australia. Previous studies have reported distinct isolates of toxic D. circinale producing different saxitoxin analogues at varying amounts, but the mechanisms responsible remain poorly understood. To assess the characteristics that may be responsible for this variance, a morphological, molecular and chemical survey of 28 Anabaena isolates was conducted. Morphological characteristics, presence or absence of saxitoxin biosynthetic genes and toxin amount and profile were assessed...
August 7, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28795265/the-stress-induced-scp-hlip-family-of-small-light-harvesting-like-proteins-scpabcde-protects-photosystem-ii-from-photoinhibitory-damages-in-the-cyanobacterium-synechocystis-sp-pcc-6803
#10
Tania Tibiletti, Ateeq Ur Rehman, Imre Vass, Christiane Funk
Small CAB-like proteins (SCPs) are single-helix light-harvesting-like proteins found in all organisms performing oxygenic photosynthesis. We investigated the effect of growth in moderate salt stress on these stress-induced proteins in the cyanobacterium Synechocystis sp. PCC 6803 depleted of Photosystem I (PSI), which expresses SCPs constitutively, and compared these cells with a PSI-less/ScpABCDE(-) mutant. SCPs, by stabilizing chlorophyll-binding proteins and Photosystem II (PSII) assembly, protect PSII from photoinhibitory damages, and in their absence electrons accumulate and will lead to ROS formation...
August 9, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28794262/super-resolution-microscopy-of-the-%C3%A3-carboxysome-reveals-a-homogenous-matrix
#11
Matthew J Niederhuber, Talley J Lambert, Clarence Yapp, Pamela A Silver, Jessica K Polka
Carbon fixation in cyanobacteria makes a major contribution to the global carbon cycle. The cyanobacterial carboxysome is a proteinaceous microcompartment that protects and concentrates the carbon-fixing enzyme RuBisCO in a paracrystalline lattice, making it possible for these organisms to fix CO2 from the atmosphere. The protein responsible for the organization of this lattice in beta-type carboxysomes of the freshwater cyanobacterium Synechococcus elongatus, CcmM, occurs in two isoforms thought to localize differentially within the carboxysome matrix...
August 9, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28783344/columbamides-d-and-e-chlorinated-fatty-acid-amides-from-the-marine-cyanobacterium-moorea-bouillonii-collected-in-malaysia
#12
Julius Adam V Lopez, Julie G Petitbois, Charles S Vairappan, Taiki Umezawa, Fuyuhiko Matsuda, Tatsufumi Okino
Two new chlorinated fatty acid amides, columbamides D (1) and E (2), along with apratoxins A and C and wewakazole, were isolated from the organic extract of a Moorea bouillonii sample from Sabah, Malaysia. Structure elucidation was accomplished by a combination of MS and NMR analyses. The total synthesis of all four stereoisomers of 1 was completed, and the absolute configuration was determined by chiral-phase HPLC and Marfey's analysis.
August 7, 2017: Organic Letters
https://www.readbyqxmd.com/read/28783331/discovery-and-synthesis-of-caracolamide-a-an-ion-channel-modulating-dichlorovinylidene-containing-phenethylamide-from-a-panamanian-marine-cyanobacterium-cf-symploca-species
#13
C Benjamin Naman, Jehad Almaliti, Lorene Armstrong, Eduardo J Caro-Díaz, Marsha L Pierce, Evgenia Glukhov, Amanda Fenner, Carmenza Spadafora, Hosana M Debonsi, Pieter C Dorrestein, Thomas F Murray, William H Gerwick
A recent untargeted metabolomics investigation into the chemical profile of 10 organic extracts from cf. Symploca spp. revealed several interesting chemical leads for further natural product drug discovery. Subsequent target-directed isolation efforts with one of these, a Panamanian marine cyanobacterium cf. Symploca sp., yielded a phenethylamide metabolite that terminates in a relatively rare gem-dichlorovinylidene moiety, caracolamide A (1), along with a known isotactic polymethoxy-1-alkene (2). Detailed NMR and HRESIMS analyses were used to determine the structures of these molecules, and compound 1 was confirmed by a three-step synthesis...
August 7, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28782566/small-monomeric-and-highly-stable-near-infrared-fluorescent-markers-derived-from-the-thermophilic-phycobiliprotein-apcf2
#14
Wen-Long Ding, Dan Miao, Ya-Nan Hou, Su-Ping Jiang, Bao-Qin Zhao, Ming Zhou, Hugo Scheer, Kai-Hong Zhao
Biliproteins have extended the spectral range of fluorescent proteins into the region of maximal transmission of most tissues and are favorable for multiplexing, but their application presents considerable challenges. Their fluorescence derives from open-chain tetrapyrrole chromophores which often require the introduction of dedicated reductases and lyases. In addition, their fluorescence yield generally decreases with increasing wavelengths and depends strongly on the state of the binding protein. We report fluorescent biliproteins, termed BDFPs, that are derived from the phycobilisome core subunit, ApcF2: this subunit is induced in the thermophilic cyanobacterium, Chroococcidiopsis thermalis, by far-red light and binds phycocyanobilin non-covalently...
August 3, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28768428/evaluation-of-antiplasmodial-properties-of-a-cyanobacterium-spirulina-platensis-and-its-mechanism-of-action
#15
Diah Anggraini Wulandari, Elizabeth Sidhartha, Iriani Setyaningsih, Jonathan Marshall Marbun, Din Syafruddin, Puji Budi Setia Asih
The rapid emergence of antimalarial drug resistance necessitates a continual effort on novel drug discovery. A cyanobacterium, Spirulina platensis, is a potential antimalarial agent that has been widely consumed as food supplement in the form of crude extract. It is known to possess antiviral, antibacterial and antifungi activities. This study examined the antimalarial activities of several Spirulina formulas against Plasmodium falciparum 3D7, in vitro. The tested Spirulina formulas included commercially available capsule, crude extract and alkaloid fraction...
August 2, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28762722/posttranslational-modification-of-heme-b-in-a-bacterial-peroxidase-the-role-of-heme-to-protein-ester-bonds-in-ligand-binding-and-catalysis
#16
Andrea Nicolussi, Markus Auer, Julia Weissensteiner, Georg Schütz, Sonja Katz, Daniel Maresch, Stefan Hofbauer, Marzia Bellei, Gianantonio Battistuzzi, Paul G Furtmüller, Christian Obinger
The existence of covalent heme to protein bonds is the most striking structural feature of mammalian peroxidases, including myeloperoxidase and lactoperoxidase (LPO). These autocatalytic posttranslational modifications (PTMs) were shown to strongly influence the biophysical and biochemical properties of these oxidoreductases. Recently, we reported the occurrence of stable LPO-like counterparts with two heme to protein ester linkages in bacteria. This study focuses on the model wild-type peroxidase from the cyanobacterium Lyngbya sp...
August 16, 2017: Biochemistry
https://www.readbyqxmd.com/read/28762000/production-of-%C3%AF-3-fatty-acids-in-marine-cyanobacterium-synechococcus-sp-strain-nkbg-15041c-via-genetic-engineering
#17
Tomoko Yoshino, Natsumi Kakunaka, Yue Liang, Yasuhito Ito, Yoshiaki Maeda, Tatsuhiro Nomaguchi, Tadashi Matsunaga, Tsuyoshi Tanaka
Omega-3 fatty acids (ω3 FAs) have attracted attention because they have various health benefits for humans. Fish oils are currently major sources of ω3 FAs, but a sustainable supply of ω3 FAs based on fish oils is problematic because of the increasing demand. In this study, the production potential of a genetically engineered marine cyanobacterium, Synechococcus sp. strain NKBG 15041c, was examined as an alternative source of ω3 FAs. A change in fatty acid composition of this cyanobacterium was successfully induced by the expression of a heterologous Δ6-desaturase, and the transformants synthesized stearidonic acid, which the wild type cannot produce...
August 1, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28758990/coordinated-regulation-of-growth-activity-and-transcription-in-natural-populations-of-the-unicellular-nitrogen-fixing-cyanobacterium-crocosphaera
#18
Samuel T Wilson, Frank O Aylward, Francois Ribalet, Benedetto Barone, John R Casey, Paige E Connell, John M Eppley, Sara Ferrón, Jessica N Fitzsimmons, Christopher T Hayes, Anna E Romano, Kendra A Turk-Kubo, Alice Vislova, E Virginia Armbrust, David A Caron, Matthew J Church, Jonathan P Zehr, David M Karl, Edward F DeLong
The temporal dynamics of phytoplankton growth and activity have large impacts on fluxes of matter and energy, yet obtaining in situ metabolic measurements of sufficient resolution for even dominant microorganisms remains a considerable challenge. We performed Lagrangian diel sampling with synoptic measurements of population abundances, dinitrogen (N2) fixation, mortality, productivity, export and transcription in a bloom of Crocosphaera over eight days in the North Pacific Subtropical Gyre (NPSG). Quantitative transcriptomic analyses revealed clear diel oscillations in transcript abundances for 34% of Crocosphaera genes identified, reflecting a systematic progression of gene expression in diverse metabolic pathways...
July 31, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28756560/in-silico-analysis-of-the-cyanobacterial-lectin-scytovirin-new-insights-into-binding-properties
#19
Andrei Santos Siqueira, Alex Ranieri Jerônimo Lima, Rafael Conceição de Souza, Alberdan Silva Santos, João Lídio da Silva Gonçalves Vianez Júnior, Evonnildo Costa Gonçalves
Scytovirin is a lectin isolated from the cyanobacterium Scytonema varium that has shown activity against HIV, SARS coronavirus and Zaire Ebola virus. Its 95 amino acids are divided into two structural domains (SD), the first spanning amino acids 1-48 (SD1) and the second 49-95 (SD2). Interestingly, the domains are nearly identical but differ in their affinities for carbohydrates. With the aim of enhancing understanding of the binding properties of scytovirin, we performed molecular dynamics (MD) simulations of scytovirin complexed with Man4...
July 29, 2017: Molecular Biology Reports
https://www.readbyqxmd.com/read/28755723/review-a-meta-analysis-comparing-cell-division-and-cell-adhesion-in-microcystis-colony-formation
#20
REVIEW
Man Xiao, Anusuya Willis, Michele A Burford, Ming Li
The freshwater cyanobacterium Microcystis is a nuisance species. It forms large blooms on the water surface and overwhelmingly dominates the ecosystem through the formation of colonies from single cells surrounded by mucilage; however, the mechanism of colony formation is poorly understood. Two mechanisms of Microcystis colony formation have been proposed: cell-division, where cells remain attached after binary fission; and cell-adhesion, where single cells stick together. This paper examined the published literature on Microcystis colony formation to clarify the mechanism of colony formation and its relationship to environmental drivers...
July 2017: Harmful Algae
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