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https://www.readbyqxmd.com/read/28213741/assembly-of-photoactive-orange-carotenoid-protein-from-its-domains-unravels-a-carotenoid-shuttle-mechanism
#1
Marcus Moldenhauer, Nikolai N Sluchanko, David Buhrke, Dmitry V Zlenko, Neslihan N Tavraz, Franz-Josef Schmitt, Peter Hildebrandt, Eugene G Maksimov, Thomas Friedrich
The photoswitchable orange carotenoid protein (OCP) is indispensable for cyanobacterial photoprotection by quenching phycobilisome fluorescence upon photoconversion from the orange OCP(O) to the red OCP(R) form. Cyanobacterial genomes frequently harbor, besides genes for orange carotenoid proteins (OCPs), several genes encoding homologs of OCP's N- or C-terminal domains (NTD, CTD). Unlike the well-studied NTD homologs, called Red Carotenoid Proteins (RCPs), the role of CTD homologs remains elusive. We show how OCP can be reassembled from its functional domains...
February 17, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28209822/complete-genome-sequence-of-methanohalophilus-halophilus-dsm-3094-t-isolated-from-a-cyanobacterial-mat-and-bottom-deposits-at-hamelin-pool-shark-bay-northwestern-australia
#2
Stéphane L'Haridon, Erwan Corre, Yue Guan, Manikandan Vinu, Violetta La Cono, Mickail Yakimov, Ulrich Stingl, Laurent Toffin, Mohamed Jebbar
The complete genome sequence of Methanohalophilus halophilus DSM 3094(T), a member of the Methanosarcinaceae family and the Methanosarcianales order, consists of 2,022,959 bp in one contig and contains 2,137 predicted genes. The genome is consistent with a halophilic methylotrophic anaerobic lifestyle, including the methylotrophic and CO2-H2 methanogensis pathways.
February 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28208670/eutrophication-and-warming-boost-cyanobacterial-biomass-and-microcystins
#3
Miquel Lürling, Frank van Oosterhout, Elisabeth Faassen
Eutrophication and warming are key drivers of cyanobacterial blooms, but their combined effects on microcystin (MC) concentrations are less studied. We tested the hypothesis that warming promotes cyanobacterial abundance in a natural plankton community and that eutrophication enhances cyanobacterial biomass and MC concentrations. We incubated natural seston from a eutrophic pond under normal, high, and extreme temperatures (i.e., 20, 25, and 30 °C) with and without additional nutrients added (eutrophication) mimicking a pulse as could be expected from projected summer storms under climate change...
February 11, 2017: Toxins
https://www.readbyqxmd.com/read/28208628/variable%C3%A2-cyanobacterial%C3%A2-toxin%C3%A2-and%C3%A2-metabolite%C3%A2-profiles%C3%A2-across%C3%A2-six%C3%A2-eutrophic%C3%A2-lakes%C3%A2-of%C3%A2-differing%C3%A2-physiochemical%C3%A2-characteristics
#4
Lucas J Beversdorf, Chelsea A Weirich, Sarah L Bartlett, Todd R Miller
Future sustainability of freshwater resources is seriously threatened due to the presence  of  harmful  cyanobacterial  blooms,  and  yet,  the  number,  extent,  and  distribution  of  most  cyanobacterial toxins-including "emerging" toxins and other bioactive compounds-are poorly  understood.  We  measured  15  cyanobacterial  compounds-including  four  microcystins  (MC),  saxitoxin (SXT), cylindrospermopsin (CYL), anatoxin-a (ATX) and homo-anatoxin-a (hATX), two  anabaenopeptins (Apt), three cyanopeptolins (Cpt), microginin (Mgn), and nodularin (NOD)-in  six freshwater lakes that regularly experience noxious cHABs...
February 10, 2017: Toxins
https://www.readbyqxmd.com/read/28204603/expression-of-cyanobacterial-fbp-sbpase-in-soybean-prevents-yield-depression-under-future-climate-conditions
#5
Iris H Köhler, Ursula M Ruiz-Vera, Andy VanLoocke, Michell L Thomey, Tom Clemente, Stephen P Long, Donald R Ort, Carl J Bernacchi
No abstract text is available yet for this article.
January 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28202362/effects-of-crude-extracts-of-a-saxitoxin-producer-strain-of-the-cyanobacterium-cylindrospermopsis-raciborskii-on-the-swimming-behavior-of-wild-and-laboratory-reared-guppy-poecilia-vivipara
#6
Karina C Lopes, Aloysio da S Ferrão-Filho, Everton G N Dos Santos, Rodolfo A Cunha, Cláudia P Santos
The cyanobacterium Cylindrospermopsis raciborskii is an invasive species in water supply reservoirs worldwide, which can produces cylindrospermopsins and saxitoxins. In the wild, guppy (Poecilia vivipara) can be exposed to cyanotoxins, but those born and reared in laboratory are free of this contact. The aim of this paper was to comparatively measure the locomotor activity of 'wild' and 'lab' P. vivipara before and after exposure to crude extracts of two different cultures of C. raciborskii (CYRF-01), a saxitoxin-procucer strain...
February 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28196492/long-term-microfluidic-tracking-of-coccoid-cyanobacterial-cells-reveals-robust-control-of-division-timing
#7
Feiqiao Brian Yu, Lisa Willis, Rosanna Man Wah Chau, Alessandro Zambon, Mark Horowitz, Devaki Bhaya, Kerwyn Casey Huang, Stephen R Quake
BACKGROUND: Cyanobacteria are important agents in global carbon and nitrogen cycling and hold great promise for biotechnological applications. Model organisms such as Synechocystis sp. and Synechococcus sp. have advanced our understanding of photosynthetic capacity and circadian behavior, mostly using population-level measurements in which the behavior of individuals cannot be monitored. Synechocystis sp. cells are small and divide slowly, requiring long-term experiments to track single cells...
February 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/28193843/bound-substrate-in-the-structure-of-cyanobacterial-branching-enzyme-supports-a-new-mechanistic-model
#8
Mari Hayashi, Ryuichiro Suzuki, Christophe Colleoni, Steven G Ball, Naoko Fujita, Eiji Suzuki
Branching enzyme (BE) catalyzes the formation of α-1,6-glucosidic linkages in amylopectin and glycogen. The reaction products are variable depending on the organism sources, and the mechanistic basis for these different outcomes is unclear. Although most cyanobacteria have only one BE isoform belonging to glycoside hydrolase (GH) family 13, Cyanothece sp. ATCC 51142 has three isoforms (BE1, BE2, and BE3) with distinct enzymatic properties, suggesting that investigations of these enzymes might provide unique insights into this system...
February 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28193586/influence-of-cuso4-and-chelated-copper-algaecide-exposures-on-biodegradation-of-microcystin-lr
#9
Kyla J Iwinski, John H Rodgers, Ciera M Kinley, Maas Hendrikse, Alyssa J Calomeni, Andrew D McQueen, Tyler D Geer, Jenny Liang, Vanessa Friesen, Monique Haakensen
Copper exposures from algaecide applications in aquatic systems are hypothesized to impede bacterial degradation of microcystin (MC), a cyanobacterial produced hepatotoxin. Despite regulatory implications of this hypothesis, limited data exist on influences of copper-exposures on MC-degrading bacteria and consequent MC-degradation. In this study, influences of copper-algaecide concentrations and formulations on bacterial composition and microcystin-LR (MCLR) degradation were investigated. Microcystis aeruginosa was exposed to four concentrations (0-5...
January 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28188781/the-cyanobacterial-fluorescence-recovery-protein-has-two-distinct-activities-orange-carotenoid-protein-amino-acids-involved-in-frp-interaction
#10
Adrien Thurotte, Céline Bourcier de Carbon, Adjélé Wilson, Léa Talbot, Sandrine Cot, Rocio López-Igual, Diana Kirilovsky
To deal with fluctuating light condition, cyanobacteria have developed a photoprotective mechanism which, under high light conditions, decreases the energy arriving at the photochemical centers. It relies on a photoswitch, the Orange Carotenoid Protein (OCP). Once photoactivated, OCP binds to the light harvesting antenna, the phycobilisome (PBS), and triggers the thermal dissipation of the excess energy absorbed. Deactivation of the photoprotective mechanism requires the intervention of a third partner, the Fluorescence Recovery Protein (FRP)...
February 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28188780/structural-insights-into-the-cold-adaptation-of-the-photosynthetic-pigment-protein-c-phycocyanin-from-an-arctic-cyanobacterium
#11
Hai-Nan Su, Qian-Min Wang, Chun-Yang Li, Kang Li, Wei Luo, Bo Chen, Xi-Ying Zhang, Qi-Long Qin, Bai-Cheng Zhou, Xiu-Lan Chen, Yu-Zhong Zhang, Bin-Bin Xie
The cold adaptation mechanism of phycobiliproteins, the major photosynthetic pigment-proteins in cyanobacteria and red algae, has rarely been studied. Here we reported the biochemical, structural, and molecular dynamics simulation study of the C-phycocyanin from Arctic cyanobacterial strain Pseudanabaena sp. LW0831. We characterized the phycobilisome components of LW0831 and obtained their gene sequences. Compared to the mesophilic counterpart from Arthrospira platensis (Ar-C-PC), LW0831 C-phycocyanin (Ps-C-PC) has a decreased thermostability (∆Tm of -16°C), one of the typical features of cold-adapted enzymes...
February 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28188680/experimental-fossilization-of-mat-forming-cyanobacteria-in-coarse-grained-siliciclastic-sediments
#12
S A Newman, V Klepac-Ceraj, G Mariotti, S B Pruss, N Watson, T Bosak
Microbial fossils and textures are commonly preserved in Ediacaran and early Cambrian coarse-grained siliciclastic sediments that were deposited in tidal and intertidal marine settings. In contrast, the fossilization of micro-organisms in similar marine environments of post-Cambrian age is less frequently reported. Thus, temporal discrepancies in microbial preservation may have resulted from the opening and closing of a unique taphonomic window during the terminal Proterozoic and early Phanerozoic, respectively...
February 11, 2017: Geobiology
https://www.readbyqxmd.com/read/28188547/structurally-conserved-channels-in-cyanobacterial-and-plant-photosystem-ii
#13
Naoki Sakashita, Hiroshi C Watanabe, Takuya Ikeda, Hiroshi Ishikita
In the cyanobacterial photosystem II (PSII), the O4-water chain in the D1 and CP43 proteins, a chain of water molecules that are directly H-bonded to O4 of the Mn4Ca cluster, is linked with a channel that connects the protein bulk surface along with a membrane-extrinsic protein subunit, PsbU (O4-PsbU channel). The cyanobacterial PSII structure also shows that the O1 site of the Mn4Ca cluster has a chain of H-bonded water molecules, which is linked with the channel that proceeds toward the bulk surface via PsbU and PsbV (O1-PsbU/V channel)...
February 10, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28186498/underlying-mechanisms-for-syntrophic-metabolism-of-essential-enzyme-cofactors-in-microbial-communities
#14
Margaret F Romine, Dmitry A Rodionov, Yukari Maezato, Andrei L Osterman, William C Nelson
Many microorganisms are unable to synthesize essential B vitamin-related enzyme cofactors de novo. The underlying mechanisms by which such microbes survive in multi-species communities are largely unknown. We previously reported the near-complete genome sequence of two ~18-member unicyanobacterial microbial consortia that maintain stable membership on defined medium lacking vitamins. Here we have used genome analysis and growth studies on isolates derived from the consortia to reconstruct pathways for biogenesis of eight essential cofactors and predict cofactor usage and precursor exchange in these communities...
February 10, 2017: ISME Journal
https://www.readbyqxmd.com/read/28184984/allelopathic-effects-of-myriophyllum-aquaticum-on-two-cyanobacteria-of-anabaena-flos-aquae-and-microcystis-aeruginosa
#15
Haiping Wang, Feng Liu, Pei Luo, Zihan Li, Liguo Zheng, Hua Wang, Dongsheng Zou, Jinshui Wu
Allelopathy has been proposed as a sustainable means to control undesired algal growth and to reduce blooms threatening freshwater systems worldwide. In this study, the allelopathic effects of Myriophyllum aquaticum and its exudate on two typical bloom-forming cyanobacteria, Microcystis aeruginosa and Anabaena flos-aquae, were investigated under laboratory conditions. The growth of the cyanobacteria was strongly inhibited by live M. aquaticum while the primary addition of M. Aquaticum exudates had a significant inhibitory effect on the growth of M...
February 9, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28183779/draft-genome-sequence-of-candidatus-synechococcus-spongiarum-m9-binned-from-a-metagenome-of-south-china-sea-sponge-theonella-swinhoei
#16
Fang Liu, Jinlong Li, Zhiyong Li
"Candidatus Synechococcus spongiarum" represents the widespread cyanobacterial symbionts found in marine sponges with relatively high genomic variability and likely important ecological roles. We present here the draft genome sequence of "Candidatus Synechococcus spongiarum" m9, which was assembled from a metagenome of Theonella swinhoei sampled in the South China Sea.
February 9, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28182317/impact-of-light-intensity-and-quality-on-chromatophore-and-nuclear-gene-expression-in-paulinella-chromatophora-an-amoeba-with-nascent-photosynthetic-organelles
#17
Ru Zhang, Eva C M Nowack, Dana C Price, Debashish Bhattacharya, Arthur R Grossman
Plastid evolution has been attributed to a single primary endosymbiotic event that occurred ~1.6 BYA in which a cyanobacterium was engulfed and retained by a eukaryotic cell, although early steps in plastid integration are poorly understood. The photosynthetic amoeba Paulinella chromatophora represents a unique model to study plastid evolution because it contains cyanobacterium-derived photosynthetic organelles termed "chromatophores" that originated relatively recently (0.06-0.14 BYA). The chromatophore genome is ~1/3 the size of the genome of closely related cyanobacteria, but 10-fold larger than most plastid genomes...
February 9, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28181142/erratum-to-is-raf1-protein-from-synechocystis-sp-pcc-6803-really-needed-in-the-cyanobacterial-rubisco-assembly-process
#18
Piotr Kolesinski, Malgorzata Rydzy, Andrzej Szczepaniak
No abstract text is available yet for this article.
February 8, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28179548/multi-step-excitation-energy-transfer-engineered-in-genetic-fusions-of-natural-and-synthetic-light-harvesting-proteins
#19
Joshua A Mancini, Goutham Kodali, Jianbing Jiang, Kanumuri Ramesh Reddy, Jonathan S Lindsey, Donald A Bryant, P Leslie Dutton, Christopher C Moser
Synthetic proteins designed and constructed from first principles with minimal reference to the sequence of any natural protein have proven robust and extraordinarily adaptable for engineering a range of functions. Here for the first time we describe the expression and genetic fusion of a natural photosynthetic light-harvesting subunit with a synthetic protein designed for light energy capture and multi-step transfer. We demonstrate excitation energy transfer from the bilin of the CpcA subunit (phycocyanin α subunit) of the cyanobacterial photosynthetic light-harvesting phycobilisome to synthetic four-helix-bundle proteins accommodating sites that specifically bind a variety of selected photoactive tetrapyrroles positioned to enhance energy transfer by relay...
February 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28174568/co-expression-of-cyanobacterial-genes-for-arsenic-methylation-and-demethylation-in-escherichia-coli-offers-insights-into-arsenic-resistance
#20
Yu Yan, Xi-Mei Xue, Yu-Qing Guo, Yong-Guan Zhu, Jun Ye
Arsenite [As(III)] and methylarsenite [MAs(III)] are the most toxic inorganic and methylated arsenicals, respectively. As(III) and MAs(III) can be interconverted in the unicellular cyanobacterium Nostoc sp. PCC 7120 (Nostoc), which has both the arsM gene (NsarsM), which is responsible for arsenic methylation, and the arsI gene (NsarsI), which is responsible for MAs(III) demethylation. It is not clear how the cells prevent a futile cycle of methylation and demethylation. To investigate the relationship between arsenic methylation and demethylation, we constructed strains of Escherichia coli AW3110 (ΔarsRBC) expressing NsarsM or/and NsarsI...
2017: Frontiers in Microbiology
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