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Marine biotechnology

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https://www.readbyqxmd.com/read/27881980/comparative-genomics-of-dna-recombination-and-repair-in-cyanobacteria-biotechnological-implications
#1
REVIEW
Corinne Cassier-Chauvat, Théo Veaudor, Franck Chauvat
Cyanobacteria are fascinating photosynthetic prokaryotes that are regarded as the ancestors of the plant chloroplast; the purveyors of oxygen and biomass for the food chain; and promising cell factories for an environmentally friendly production of chemicals. In colonizing most waters and soils of our planet, cyanobacteria are inevitably challenged by environmental stresses that generate DNA damages. Furthermore, many strains engineered for biotechnological purposes can use DNA recombination to stop synthesizing the biotechnological product...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27878745/characterization-of-a-marine-microbial-community-used-for-enhanced-sulfate-reduction-and-copper-precipitation-in-a-two-step-process
#2
Octavio García-Depraect, Claudia Guerrero-Barajas, Janet Jan-Roblero, Alberto Ordaz
Marine microorganisms that are obtained from hydrothermal vent sediments present a great metabolic potential for applications in environmental biotechnology. However, the work done regarding their applications in engineered systems is still scarce. Hence, in this work, the sulfate reduction process carried out by a marine microbial community in an upflow anaerobic sludge blanket (UASB) reactor was investigated for 190 days under sequential batch mode. The effects of 1000 to 5500 mg L(-1) of SO4(-2) and the chemical oxygen demand (COD)/SO4(-2) ratio were studied along with a kinetic characterization with lactate as the electron donor...
November 23, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27869696/pilot-scale-production-and-thermostability-improvement-of-the-m23-protease-pseudoalterin-from-the-deep-sea-bacterium-pseudoalteromonas-sp-cf6-2
#3
Jie Yang, Yang Yu, Bai-Lu Tang, Shuai Zhong, Mei Shi, Bin-Bin Xie, Xi-Ying Zhang, Bai-Cheng Zhou, Yu-Zhong Zhang, Xiu-Lan Chen
Pseudoalterin is the most abundant protease secreted by the marine sedimental bacterium Pseudoalteromonas sp. CF6-2 and is a novel cold-adapted metalloprotease of the M23 family. Proteases of the M23 family have high activity towards peptidoglycan and elastin, suggesting their promising biomedical and biotechnological potentials. To lower the fermentive cost and improve the pseudoalterin production of CF6-2, we optimized the fermentation medium by using single factor experiments, added 0.5% sucrose as a carbon source, and lowered the usage of artery powder from 1...
November 17, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27824282/marine-sponge-associated-bacteria-as-a-potential-source-for-polyhydroxyalkanoates
#4
Ganesan Sathiyanarayanan, Ganesan Saibaba, George Seghal Kiran, Yung-Hun Yang, Joseph Selvin
Marine sponges are filter feeding porous animals and usually harbor a remarkable array of microorganisms in their mesohyl tissues as transient and resident endosymbionts. The marine sponge-microbial interactions are highly complex and, in some cases, the relationships are thought to be truly symbiotic or mutualistic rather than temporary associations resulting from sponge filter-feeding activity. The marine sponge-associated bacteria are fascinating source for various biomolecules that are of potential interest to several biotechnological industries...
November 8, 2016: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/27822708/quorum-sensing-and-quorum-quenching-in-the-phycosphere-of-phytoplankton-a-case-of-chemical-interactions-in-ecology
#5
REVIEW
Jean Luc Rolland, Didier Stien, Sophie Sanchez-Ferandin, Raphaël Lami
The interactions between bacteria and phytoplankton regulate many important biogeochemical reactions in the marine environment, including those in the global carbon, nitrogen, and sulfur cycles. At the microscopic level, it is now well established that important consortia of bacteria colonize the phycosphere, the immediate environment of phytoplankton cells. In this microscale environment, abundant bacterial cells are organized in a structured biofilm, and exchange information through the diffusion of small molecules called semiochemicals...
November 7, 2016: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/27782372/theoretical-calculations-on-the-feasibility-of-microalgal-biofuels-utilization-of-marine-resources-could-help-realizing-the-potential-of-microalgae
#6
Hanwool Park, Choul-Gyun Lee
Microalgae have long been considered as one of most promising feedstocks with better characteristics for biofuels production over conventional energy crops. There have been a wide range of estimations on the feasibility of microalgal biofuels based on various productivity assumptions and data from different scales. The theoretical maximum algal biofuel productivity, however, can be calculated by the amount of solar irradiance and photosynthetic efficiency (PE), assuming other conditions are within the optimal range...
November 2016: Biotechnology Journal
https://www.readbyqxmd.com/read/27770862/marine-microbes-as-a-potential-source-of-cellulolytic-enzymes
#7
N Trivedi, C R K Reddy, A M Lali
Marine environment hosts the wide range of habitats with remarkably high and diverse microbial populations. The ability of marine microorganisms to survive in extreme temperature, salinity, and pressure depends on the function of multivarious enzyme systems that in turn provide vast potential for biotechnological exploration studies. Therefore, the enzymes from marine microorganism represent novel bio catalytic potential with stable and reliable properties. Microbial cellulases constitute a major group of industrial enzymes that find applications in various industries...
2016: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/27768719/rlj-rgd3-a-novel-recombinant-toxin-protein-from-lampetra-japonica-protects-against-cerebral-reperfusion-injury-following-middle-cerebral-artery-occlusion-involving-the-integrin-pi3k-akt-pathway-in-rats
#8
Qian Lu, Jihong Wang, Junshu Jiang, Shengnan Wang, Qilan Jia, Yue Wang, Weiping Li, Qin Zhou, Li Lv, Qingwei Li
BACKGROUND: The RGD-toxin protein Lj-RGD3 is a naturally occurring 118 amino acid peptide that can be obtained from the salivary gland of the Lampetra japonica fish. This unique peptide contains 3 RGD (Arg-Gly-Asp) motifs in its primary structure. Lj-RGD3 is available in recombinant form (rLj-RGD3) and can be produced in large quantities using DNA recombination techniques. The pharmacology of the three RGD motif-containing peptides has not been studied. This study investigated the protective effects of rLj-RGD3, a novel polypeptide, against ischemia/reperfusion-induced damage to the brain caused by middle cerebral artery occlusion (MCAO) in a rat stroke model...
2016: PloS One
https://www.readbyqxmd.com/read/27718421/dna-damage-protecting-and-free-radical-scavenging-properties-of-mycosporine-2-glycine-from-the-dead-sea-cyanobacterium-in-a375-human-melanoma-cell-lines
#9
Vipaporn Cheewinthamrongrod, Hakuto Kageyama, Tanapat Palaga, Teruhiro Takabe, Rungaroon Waditee-Sirisattha
Mycosporine-like amino acids (MAAs) are a group of natural sunscreen compounds that possess highly photoprotective properties. The most commonly found MAAs in marine organisms is shinorine, porphyra-334, and mycosporine-glycine. However, the halophilic species accumulate mycosporine-2-glycine (M2G) as the major MAA. In this study, we have investigated the protective effect of M2G against oxidative stress. In vitro radical scavenging activity revealed that M2G exhibited a significant inhibition with scavenging concentration (SC) 50 value of 22±1...
September 29, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27644133/bioprospecting-from-cultivable-bacterial-communities-of-marine-sediment-and-invertebrates-from-the-underexplored-ubatuba-region-of-brazil
#10
Marcelo M P Tangerina, Hebelin Correa, Brad Haltli, Wagner Vilegas, Russell G Kerr
Shrimp fisheries along the Brazilian coast have significant environmental impact due to high by-catch rates (21 kg per kilogram of shrimp). Typically discarded, by-catch contains many invertebrates that may host a great variety of bacterial genera, some of which may produce bioactive natural products with biotechnological applications. Therefore, to utilize by-catch that is usually discarded we explored the biotechnological potential of culturable bacteria of two abundant by-catch invertebrate species, the snail Olivancillaria urceus and the sea star Luidia senegalensis...
September 19, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27624095/o-heterocyclic-derivatives-with-antibacterial-properties-from-marine-bacterium-bacillus-subtilis-associated-with-seaweed-sargassum-myriocystum
#11
Kajal Chakraborty, Bini Thilakan, Rekha Devi Chakraborty, Vamshi Krishna Raola, Minju Joy
The brown seaweed, Sargassum myriocystum associated with heterotrophic bacterium, Bacillus subtilis MTCC 10407 (JF834075) exhibited broad-spectra of potent antibacterial activities against pathogenic bacteria Aeromonas hydrophila, Vibrio vulnificus, and Vibrio parahaemolyticus. B. subtilis MTCC 10407 was found to be positive for polyketide synthetase (pks) gene, and therefore, was considered to characterize secondary metabolites bearing polyketide backbone. Using bioassay-guided fractionation, two new antibacterial O-heterocyclic compounds belonging to pyranyl benzoate analogs of polyketide origin, with activity against pathogenic bacteria, have been isolated from the ethyl acetate extract of B...
September 13, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27621725/diversity-biogeography-and-biodegradation-potential-of-actinobacteria-in-the-deep-sea-sediments-along-the-southwest-indian-ridge
#12
Ping Chen, Limin Zhang, Xiaoxuan Guo, Xin Dai, Li Liu, Lijun Xi, Jian Wang, Lei Song, Yuezhu Wang, Yaxin Zhu, Li Huang, Ying Huang
The phylum Actinobacteria has been reported to be common or even abundant in deep marine sediments, however, knowledge about the diversity, distribution, and function of actinobacteria is limited. In this study, actinobacterial diversity in the deep sea along the Southwest Indian Ridge (SWIR) was investigated using both 16S rRNA gene pyrosequencing and culture-based methods. The samples were collected at depths of 1662-4000 m below water surface. Actinobacterial sequences represented 1.2-9.1% of all microbial 16S rRNA gene amplicon sequences in each sample...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27614749/pharmacological-potential-of-phylogenetically-diverse-actinobacteria-isolated-from-deep-sea-coral-ecosystems-of-the-submarine-avil%C3%A3-s-canyon-in-the-cantabrian-sea
#13
Aida Sarmiento-Vizcaíno, Verónica González, Alfredo F Braña, Juan J Palacios, Luis Otero, Jonathan Fernández, Axayacatl Molina, Andreas Kulik, Fernando Vázquez, José L Acuña, Luis A García, Gloria Blanco
Marine Actinobacteria are emerging as an unexplored source for natural product discovery. Eighty-seven deep-sea coral reef invertebrates were collected during an oceanographic expedition at the submarine Avilés Canyon (Asturias, Spain) in a range of 1500 to 4700 m depth. From these, 18 cultivable bioactive Actinobacteria were isolated, mainly from corals, phylum Cnidaria, and some specimens of phyla Echinodermata, Porifera, Annelida, Arthropoda, Mollusca and Sipuncula. As determined by 16S rRNA sequencing and phylogenetic analyses, all isolates belong to the phylum Actinobacteria, mainly to the Streptomyces genus and also to Micromonospora, Pseudonocardia and Myceligenerans...
September 10, 2016: Microbial Ecology
https://www.readbyqxmd.com/read/27610212/complete-genome-sequence-of-halomonas-sp-r5-57
#14
Adele Williamson, Concetta De Santi, Bjørn Altermark, Christian Karlsen, Erik Hjerde
The marine Arctic isolate Halomonas sp. R5-57 was sequenced as part of a bioprospecting project which aims to discover novel enzymes and organisms from low-temperature environments, with potential uses in biotechnological applications. Phenotypically, Halomonas sp. R5-57 exhibits high salt tolerance over a wide range of temperatures and has extra-cellular hydrolytic activities with several substrates, indicating it secretes enzymes which may function in high salinity conditions. Genome sequencing identified the genes involved in the biosynthesis of the osmoprotectant ectoine, which has applications in food processing and pharmacy, as well as those involved in production of polyhydroxyalkanoates, which can serve as precursors to bioplastics...
2016: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/27597262/marine-biotechnology-diving-deeper-for-drugs
#15
Detmer Sipkema
No abstract text is available yet for this article.
September 6, 2016: Microbial Biotechnology
https://www.readbyqxmd.com/read/27538735/complete-genome-sequence-of-astaxanthin-producing-bacterium-altererythrobacter-ishigakiensis-nbrc-107699
#16
Xiao-Lai Shi, Yue-Hong Wu, Hong Cheng, Xin-Qi Zhang, Chun-Sheng Wang, Xue-Wei Xu
Altererythrobacter ishigakiensis NBRC 107699 was isolated from marine sediment collected from a site on the coast of Ishigaki Island, Japan and deposited to the NITE Biological Resource Center. This strain is able to produce astaxanthin, which can be used as a food supplement. Here we describe the genome sequence and annotation, as well as the features of the organism. The genome of strain NBRC 107699 comprises 2,673,978bp and contains 2618 protein-coding genes (1966 with predicted functions), 42 tRNA genes and 3 rRNA genes...
August 15, 2016: Marine Genomics
https://www.readbyqxmd.com/read/27527694/marine-fungi-as-source-of-new-hydrophobins
#17
Paola Cicatiello, Alfredo Maria Gravagnuolo, Giorgio Gnavi, Giovanna Cristina Varese, Paola Giardina
Hydrophobins have been described as the most powerful surface-active proteins known. They are produced by filamentous fungi and exhibit a distinct amphiphilic structure determining their self-assembly at hydrophilic-hydrophobic interfaces and surfactant properties which have been demonstrated to be useful for several biotechnological applications. The marine environment represents a vast natural resource of new molecules produced by organisms growing in various stressful conditions. This study was focused on the screening of 100 marine fungi from Mycoteca Universitatis Taurinensis (MUT) for the identification of new hydrophobins...
November 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27491380/phycobiliproteins-a-novel-green-tool-from-marine-origin-blue-green-algae-and-red-algae
#18
Rashmi Chandra, Roberto Parra-Saldivar, Hafiz M N Iqbal
Marine species are comprising about a half of the whole global biodiversity; the sea offers an enormous resource for novel bioactive compounds. Several of the marine origin species show multifunctional bioactivities and characteristics that are useful for a discovery and/or reinvention of biologically active compounds. For millennia, marine species that includes cyanobacteria (blue-green algae) and red algae have been targeted to explore their enormous potential candidature status along with a wider spectrum of novel applications in bio- and non-bio sectors of the modern world...
August 2, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27486455/exploring-the-diversity-and-antimicrobial-potential-of-marine-actinobacteria-from-the-comau-fjord-in-northern-patagonia-chile
#19
Agustina Undabarrena, Fabrizio Beltrametti, Fernanda P Claverías, Myriam González, Edward R B Moore, Michael Seeger, Beatriz Cámara
Bioprospecting natural products in marine bacteria from fjord environments are attractive due to their unique geographical features. Although, Actinobacteria are well known for producing a myriad of bioactive compounds, investigations regarding fjord-derived marine Actinobacteria are scarce. In this study, the diversity and biotechnological potential of Actinobacteria isolated from marine sediments within the Comau fjord, in Northern Chilean Patagonia, were assessed by culture-based approaches. The 16S rRNA gene sequences revealed that members phylogenetically related to the Micrococcaceae, Dermabacteraceae, Brevibacteriaceae, Corynebacteriaceae, Microbacteriaceae, Dietziaceae, Nocardiaceae, and Streptomycetaceae families were present at the Comau fjord...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27474110/improvement-in-extracellular-protease-production-by-the-marine-antarctic-yeast-rhodotorula-mucilaginosa-l7
#20
Luciana C S Chaud, Luciana D Lario, Rafaella C Bonugli-Santos, Lara D Sette, Adalberto Pessoa Junior, Maria das Graças de A Felipe
Microorganisms from extreme and restrictive eco systems, such as the Antarctic continent, are of great interest due to their ability to synthesize products of commercial value. Among these, enzymes from psychrotolerant and psychrophilic microorganisms offer potential economical benefits due to their high activity at low and moderate temperatures. The cold adapted yeast Rhodotorula mucilaginosa L7 was selected out of 97 yeasts isolated from Antarctica as having the highest extracellular proteolytic activity in preliminary tests...
December 25, 2016: New Biotechnology
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