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https://www.readbyqxmd.com/read/28632895/genome-mining-reveals-high-incidence-of-putative-lipopeptide-biosynthesis-nrps-pks-clusters-containing-fatty-acyl-amp-ligase-genes-in-biofilm-forming-cyanobacteria
#1
Tomáš Galica, Pavel Hrouzek, Jan Mareš
Cyanobacterial lipopeptides exhibit antimicrobial and antifungal bioactivities with potential for use in pharmaceutical research. However, due to their haemolytic activity and cytotoxic effects against human cells, they may pose a health issue if produced in substantial amounts in the environment. In bacteria, lipopeptides can be synthesized via several well-evidenced mechanisms. In one of them, fatty acyl-AMP ligase (FAAL) initiates the biosynthesis by activation of a fatty acyl residue. We have performed a bioinformatic survey of the cyanobacterial genomic information available in the public databases for the presence of FAAL-containing non-ribosomal peptide synthetase/polyketide synthetase (NRPS/PKS) biosynthetic clusters, as a genetic basis for lipopeptide biosynthesis...
June 20, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28628993/the-impact-of-silver-nanoparticles-on-marine-plankton-dynamics-dependence-on-coating-size-and-concentration
#2
Anastasia Tsiola, Paraskevi Pitta, Agnès Junyer Callol, Margarita Kagiorgi, Ioanna Kalantzi, Kyriaki Mylona, Ioulia Santi, Claudio Toncelli, Spyros Pergantis, Manolis Tsapakis
During this study, three microcosm experiments were carried out with natural coastal seawater, collected in the Eastern Mediterranean Sea, in order to assess the effect of silver nanoparticle (AgNP) exposure to natural plankton communities. The impact of coating (branched-polyethyleneimine: BPEI vs. poly-vinylpyrrolidone: PVP), size (40 vs. 60nm), concentration (200, 500, 2000, 5000 and 10,000ng Ag L(-1)) and silver form (dissolved Ag(+) vs. AgNPs) were tested. The results of chlorophyll a concentration revealed that PVP AgNPs caused a higher toxicity than BPEI AgNPs, and this was possibly related to the measured higher dissolution rate...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28626613/modelling-environmental-drivers-of-black-band-disease-outbreaks-in-populations-of-foliose-corals-in-the-genus-montipora
#3
Carla C M Chen, David G Bourne, Christopher C Drovandi, Kerrie Mengersen, Bette L Willis, M Julian Caley, Yui Sato
Seawater temperature anomalies associated with warming climate have been linked to increases in coral disease outbreaks that have contributed to coral reef declines globally. However, little is known about how seasonal scale variations in environmental factors influence disease dynamics at the level of individual coral colonies. In this study, we applied a multi-state Markov model (MSM) to investigate the dynamics of black band disease (BBD) developing from apparently healthy corals and/or a precursor-stage, termed 'cyanobacterial patches' (CP), in relation to seasonal variation in light and seawater temperature at two reef sites around Pelorus Island in the central sector of the Great Barrier Reef...
2017: PeerJ
https://www.readbyqxmd.com/read/28624729/modis-observations-of-cyanobacterial-risks-in-a-eutrophic-lake-implications-for-long-term-safety-evaluation-in-drinking-water-source
#4
Hongtao Duan, Min Tao, Steven Arthur Loiselle, Wei Zhao, Zhigang Cao, Ronghua Ma, Xiaoxian Tang
The occurrence and related risks from cyanobacterial blooms have increased world-wide over the past 40 years. Information on the abundance and distribution of cyanobacteria is fundamental to support risk assessment and management activities. In the present study, an approach based on Empirical Orthogonal Function (EOF) analysis was used to estimate the concentrations of chlorophyll a (Chla) and the cyanobacterial biomarker pigment phycocyanin (PC) using data from the MODerate resolution Imaging Spectroradiometer (MODIS) in Lake Chaohu (China's fifth largest freshwater lake)...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28620737/analysis-of-bmaa-enantiomers-in-cycads-cyanobacteria-and-mammals-in-vivo-formation-and-toxicity-of-d-bmaa
#5
J S Metcalf, Doug Lobner, Sandra Anne Banack, Gregory A Cox, Peter B Nunn, Peter B Wyatt, Paul Alan Cox
Chronic dietary exposure to the cyanobacterial toxin β-N-methylamino-L-alanine (BMAA) triggers neuropathology in non-human primates, providing support for the theory that BMAA causes a fatal neurodegenerative illness among the indigenous Chamorro people of Guam. However, since there are two stereoisomers of BMAA, it is important to know if both can occur in nature, and if so, what role they might play in disease causation. As a first step, we analysed both BMAA enantiomers in cyanobacteria, cycads, and in mammals orally dosed with L-BMAA, to determine if enantiomeric changes could occur in vivo...
June 15, 2017: Amino Acids
https://www.readbyqxmd.com/read/28619807/genome-sequence-of-prosthecochloris-sp-strain-hl-130-gsb-from-the-phylum-chlorobi
#6
Vera Thiel, Daniela I Drautz-Moses, Rikky W Purbojati, Stephan C Schuster, Stephen Lindemann, Donald A Bryant
The genome of the green sulfur bacterium Prosthecochloris sp. strain HL-130-GSB, isolated from a cyanobacterial mat obtained from Hot Lake, a saline meromictic lake in Washington, USA, comprises 2,437,774 bp in a single contig. The genome is predicted to encode 2,565 proteins and contain 47 tRNA genes and 2 rRNA operons.
June 15, 2017: Genome Announcements
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/28604725/subunit-and-chlorophyll-organization-of-the-plant-photosystem-ii-supercomplex
#8
Laura S van Bezouwen, Stefano Caffarri, Ravindra S Kale, Roman Kouřil, Andy-Mark W H Thunnissen, Gert T Oostergetel, Egbert J Boekema
Photosystem II (PSII) is a light-driven protein, involved in the primary reactions of photosynthesis. In plant photosynthetic membranes PSII forms large multisubunit supercomplexes, containing a dimeric core and up to four light-harvesting complexes (LHCs), which act as antenna proteins. Here we solved a three-dimensional (3D) structure of the C2S2M2 supercomplex from Arabidopsis thaliana using cryo-transmission electron microscopy (cryo-EM) and single-particle analysis at an overall resolution of 5.3 Å...
June 12, 2017: Nature Plants
https://www.readbyqxmd.com/read/28604700/excess-of-non-conservative-amino-acid-changes-in-marine-bacterioplankton-lineages-with-reduced-genomes
#9
Haiwei Luo, Yongjie Huang, Ramunas Stepanauskas, Jijun Tang
Surface ocean waters are dominated by planktonic bacterial lineages with highly reduced genomes. The best examples are the cyanobacterial genus Prochlorococcus, the alphaproteobacterial clade SAR11 and the gammaproteobacterial clade SAR86, which together represent over 50% of the cells in surface oceans. Several studies have identified signatures of selection on these lineages in today's ocean and have postulated selection as the primary force throughout their evolutionary history. However, massive loss of genomic DNA in these lineages often occurred in the distant past, and the selective pressures underlying these ancient events have not been assessed...
June 12, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28602253/understanding-interactive-inducible-defenses-of-daphnia-and-its-phytoplankton-prey
#10
Siddiq Akbar, Jingjing Du, Hong Lin, Xiangshi Kong, Shucun Sun, Xingjun Tian
Cyanobacterial and zooplankton inducible defenses are important but understudied process that regulate the trophic interactions of freshwater ecosystem. Daphnia due to its large size is considered an important zooplankton with the high potential to control cyanobacterial blooms. It has been shown that Daphnia through maternal induction transfer tolerance to their next generation against Microcystis toxicity. Maternal induction has been investigated in different Daphnia species without considering phenotypic plasticity of prey...
June 2017: Harmful Algae
https://www.readbyqxmd.com/read/28602249/ten-year-survey-of-cyanobacterial-blooms-in-ohio-s-waterbodies-using-satellite-remote-sensing
#11
Tyler Gorham, Yuanyuan Jia, C K Shum, Jiyoung Lee
Cyanobacterial blooms are on the rise globally and are capable of adversely impacting human, animal, and ecosystem health. Blooms dominated by cyanobacteria species capable of toxin-production are commonly observed in eutrophic freshwater. The presence of cyanobacterial blooms in selected Ohio lakes, such as Lake Erie and Grand Lake St. Marys, has been well studied, but much less is known about the geographic distribution of these blooms across all of Ohio's waterbodies. We examined the geographic distribution of cyanobacterial blooms in Ohio's waterbodies from 2002 to 2011, using a nested semi-empirical algorithm and remotely sensed data from the Medium Resolution Imaging Spectrometer (MERIS) onboard the European Space Agency's Envisat...
June 2017: Harmful Algae
https://www.readbyqxmd.com/read/28602248/critical-assessment-of-chitosan-as-coagulant-to-remove-cyanobacteria
#12
Miquel Lürling, Natalia Pessoa Noyma, Leonardo de Magalhães, Marcela Miranda, Maíra Mucci, Frank van Oosterhout, Vera L M Huszar, Marcelo Manzi Marinho
Removal of cyanobacteria from the water column using a coagulant and a ballast compound is a promising technique to mitigate nuisance. As coagulant the organic, biodegradable polymer chitosan has been promoted. Results in this study show that elevated pH, as may be common during cyanobacterial blooms, as well as high alkalinity may hamper the coagulation of chitosan and thus impair its ability to effectively remove positively buoyant cyanobacteria from the water column. The underlying mechanism is likely a shielding of the protonated groups by anions...
June 2017: Harmful Algae
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
#13
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/28600685/aquidulcibacter-paucihalophilus-gen-nov-sp-nov-a-novel-member-of-family-caulobacteraceae-isolated-from-cyanobacterial-aggregates-in-a-eutrophic-lake
#14
Haiyuan Cai, Yuan Shi, Yanan Wang, Henglin Cui, Helong Jiang
A bacterial strain, TH1-2(T), was isolated from cyanobacterial aggregates in the eutrophic Lake Taihu, Jiangsu Province, China. Cells were observed to be Gram-negative, slightly curved and rod-shaped. Optimal growth was obtained at pH 7.0 (range 5.5-8.5) and 30 °C (range 20-37 °C) in trypticase soy broth (TSB) without NaCl. Growth was not observed in TSB with 1.0% (w/v) NaCl added. The cells were found to be positive for oxidase and catalase activities. The major fatty acids were identified as 3-hydroxy hexadecanoic acid (C16:0 3-OH), C16:1 ω5c and summed feature 8 (consisting of C18:1 ω6c and cis-11-Octadecenoic acid (C18:1 ω7c)...
June 9, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28598977/coagulant-plus-ballast-technique-provides-a-rapid-mitigation-of-cyanobacterial-nuisance
#15
Natalia P Noyma, Leonardo de Magalhães, Marcela Miranda, Maíra Mucci, Frank van Oosterhout, Vera L M Huszar, Marcelo M Marinho, Eduardo R A Lima, Miquel Lürling
Cyanobacteria blooms are a risk to environmental health and public safety due to the potent toxins certain cyanobacteria can produce. These nuisance organisms can be removed from water bodies by biomass flocculation and sedimentation. Here, we studied the efficacy of combinations of a low dose coagulant (poly-aluminium chloride-PAC-or chitosan) with different ballast compounds (red soil, bauxite, gravel, aluminium modified zeolite and lanthanum modified bentonite) to remove cyanobacterial biomass from water collected in Funil Reservoir (Brazil)...
2017: PloS One
https://www.readbyqxmd.com/read/28597371/uptake-and-biotransformation-of-pure-commercial-microcystin-lr-versus-microcystin-lr-from-a-natural-cyanobacterial-bloom-extract-in-the-aquatic-fungus-mucor-hiemalis
#16
Maranda Esterhuizen-Londt, Stefanie Hertel, Stephan Pflugmacher
OBJECTIVES: To evaluate the remediation efficiency of Mucor hiemalis by comparing media elimination, uptake, and biotransformation of microcystin-LR with exposure to pure toxin versus a crude bloom extract. RESULTS: With exposure to the extract, the elimination rate of microcystin-LR from the media, which was 0.28 ng MC-LR l(-1) h(-1), was significantly higher compared to that achieved with exposure to the pure toxin (0.16 ng MC-LR l(-1) h(-1)) after 24 h...
June 8, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28594867/gene-essentiality-conservation-index-and-co-evolution-of-genes-in-cyanobacteria
#17
Gopi Siva Sai Tiruveedula, Pramod P Wangikar
Cyanobacteria, a group of photosynthetic prokaryotes, dominate the earth with ~ 1015 g wet biomass. Despite diversity in habitats and an ancient origin, cyanobacterial phylum has retained a significant core genome. Cyanobacteria are being explored for direct conversion of solar energy and carbon dioxide into biofuels. For this, efficient cyanobacterial strains will need to be designed via metabolic engineering. This will require identification of target knockouts to channelize the flow of carbon toward the product of interest while minimizing deletions of essential genes...
2017: PloS One
https://www.readbyqxmd.com/read/28594045/chromophorylation-in-escherichia-coli-of-allophycocyanin-b-subunits-from-far-red-light-acclimated-chroococcidiopsis-thermalis-sp-pcc7203
#18
Qian-Zhao Xu, Qi-Ying Tang, Jia-Xin Han, Wen-Long Ding, Bao-Qing Zhao, Ming Zhou, Wolfgang Gärtner, Hugo Scheer, Kai-Hong Zhao
Cyanobacterial phycobilisomes funnel the harvested light energy to the reaction centers via two terminal emitters, allophycocyanin B and the core-membrane linker. ApcD is the α-subunit of allophycocyanin B responsible for its red-shifted absorbance (λmax 665 nm). Far-red photo-acclimated cyanobacteria contain certain allophycocyanins that show even further red-shifted absorbances (λmax > 700 nm). We studied the chromophorylation of the three far-red induced ApcD subunits ApcD2, ApcD3 and ApcD4 from Chroococcidiopsis thermalis sp...
June 8, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28593520/antioxidant-properties-and-polyphenolic-content-in-terrestrial-cyanobacteria
#19
Dhananjaya P Singh, Ratna Prabha, Shaloo Verma, Kamlesh K Meena, Mahesh Yandigeri
Cell-free extracts of twenty terrestrial cyanobacteria were evaluated for their antioxidant properties in terms of free-radical scavenging (DPPH and ABTS) and metal chelating activity and deoxyribose protection. Extract of Anabaena constricta was the most prominent antioxidant agent (IC50 for DPPH activity 0.91 mg ml(-1), ABTS 0.23 mg ml(-1), deoxyribose protection 0.63 mg ml(-1) and Fe(+2)-ion chelating 0.9 mg ml(-1)). The extracts of cyanobacterial species contained high quantity of total phenol and total flavonoid that were supposed to impart prominent antioxidant properties...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28592994/effects-of-global-transcription-factor-ntca-on-photosynthetic-production-of-ethylene-in-recombinant-synechocystis-sp-pcc-6803
#20
Huilin Mo, Xiaoman Xie, Tao Zhu, Xuefeng Lu
BACKGROUND: Cyanobacteria are considered potential photosynthetic microbial cell factories for biofuel and biochemical production. Ethylene, one of the most important organic chemicals, has been successfully synthesized in cyanobacteria by introducing an exogenous ethylene-forming enzyme (Efe). However, it remains challenging to significantly improve the biosynthetic efficiency of cyanobacterial ethylene. Genetic modification of transcription factors is a powerful strategy for reprogramming cellular metabolism toward target products...
2017: Biotechnology for Biofuels
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