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Metabolic engineering

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https://www.readbyqxmd.com/read/28334019/cell-survival-and-differentiation-with-nanocrystalline-glass-like-carbon-using-substantia-nigra-dopaminergic-cells-derived-from-transgenic-mouse-embryos
#1
Noela Rodriguez-Losada, Pablo Romero, Guillermo Estivill-Torrús, Roberto Guzmán de Villoria, Jose A Aguirre
Regenerative medicine requires, in many cases, physical supports to facilitate appropriate cellular architecture, cell polarization and the improvement of the correct differentiation processes of embryonic stem cells, induced pluripotent cells or adult cells. Because the interest in carbon nanomaterials has grown within the last decade in light of a wide variety of applications, the aim of this study was to test and evaluate the suitability and cytocompatibility of a particular nanometer-thin nanocrystalline glass-like carbon film (NGLC) composed of curved graphene flakes joined by an amorphous carbon matrix...
2017: PloS One
https://www.readbyqxmd.com/read/28331545/metabolic-engineering-of-saccharomyces-cerevisiae-to-produce-a-reduced-viscosity-oil-from-lignocellulose
#2
Tam N T Tran, Rebecca J Breuer, Ragothaman Avanasi Narasimhan, Lucas S Parreiras, Yaoping Zhang, Trey K Sato, Timothy P Durrett
BACKGROUND: Acetyl-triacylglycerols (acetyl-TAGs) are unusual triacylglycerol (TAG) molecules that contain an sn-3 acetate group. Compared to typical triacylglycerol molecules (here referred to as long chain TAGs; lcTAGs), acetyl-TAGs possess reduced viscosity and improved cold temperature properties, which may allow direct use as a drop-in diesel fuel. Their different chemical and physical properties also make acetyl-TAGs useful for other applications such as lubricants and plasticizers...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28330168/metabolism-of-waste-engine-oil-by-pseudomonas-species
#3
Lateef B Salam
Two bacterial strains phylogenetically identified as Pseudomonas aeruginosa strains RM1 and SK1 displayed extensive degradation ability on waste engine oil (SAE 40W) in batch cultures. Spectrophotometric analysis revealed the presence of various heavy metals such as lead, chromium and nickel in the waste engine oil. The rate of degradation of waste engine oil by the isolates, for the first 12 days and the last 9 days were 66.3, 31.6 mg l(-1) day(-1)  and 69.6, 40.0 mg l(-1) day(-1) for strains RM1 and SK1, respectively...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329726/folate-biofortification-in-food-crops
#4
REVIEW
Simon Strobbe, Dominique Van Der Straeten
Folates are essential vitamins in the human diet. Folate deficiency is still very common, provoking disorders such as birth defects and anemia. Biofortification via metabolic engineering is a proven powerful means to alleviate folate malnutrition. A variety of metabolic engineering approaches have been successfully implemented in different crops and tissues. Furthermore, ensuring folate stability is crucial for long-term storage of crop products. However, the current strategies, shown to be successful in rice and tomato, will need to be fine-tuned to enable adequate biofortification of other staples such as potato, wheat and cassava...
March 19, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28327426/current-strategies-for-vitamin-e-biofortification-of-crops
#5
REVIEW
Laurent Mène-Saffrané, Sébastien Pellaud
Vitamin E refers to four tocopherols and four tocotrienols that are exclusively synthesized by photosynthetic organisms. While α-tocopherol is the most potent vitamin E compound, it is not the main form consumed since the composition of most major crops is dominated by γ-tocopherol. Nutritional studies show that populations of developed countries do not consume enough vitamin E and that a large proportion of individuals exhibit plasma α-tocopherol deficiency. Following the identification of vitamin E biosynthetic genes, several strategies including metabolic engineering, classic breeding and mutation breeding, have been undertaken to improve the vitamin E content of crops...
March 16, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28325659/construction-of-a-novel-d-lactate-producing-pathway-from-dihydroxyacetone-phosphate-of-the-calvin-cycle-in-cyanobacterium-synechococcus-elongatus-pcc%C3%A2-7942
#6
Yasutaka Hirokawa, Ryota Goto, Yoshitaka Umetani, Taizo Hanai
Using engineered cyanobacteria to produce various chemicals from carbon dioxide is a promising technology for a sustainable future. Lactate is a valuable commodity that can be used for the biodegradable plastic, polylactic acid. Typically, lactate production using engineered cyanobacteria was via the conversion of pyruvate in glycolysis by lactate dehydrogenase. In cyanobacteria, the metabolic flux in the Calvin cycle is higher than that in glycolysis under photoautotrophic conditions. The construction of a novel lactate producing pathway that uses metabolites from the Calvin cycle could potentially increase lactate productivity in cyanobacteria...
March 18, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28324506/induction-of-site-specific-oxidative-damage-at-telomeres-by-killerred-fused-shelretin-proteins
#7
Rong Tan, Li Lan
Chronic oxidative stress is the major endogenous metabolic stress and contributes directly to telomere shortening and senescence. Understanding the dysfunction of telomeres under oxidative stress will greatly facilitate healthy aging and advance the treatment of aging-related diseases. Here, we describe the KR-TEL (KillerRed induced DNA damage at telomeres) system that induces site-specific oxidative damage at telomeres. We have developed the KR-TEL system by fusing killerred with the shelterin component TRF1 (KR-TRF1) or other shelterin proteins...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28324236/efficient-de-novo-synthesis-of-resveratrol-by-metabolically-engineered-escherichia-coli
#8
Junjun Wu, Peng Zhou, Xia Zhang, Mingsheng Dong
Resveratrol has been the subject of numerous scientific investigations due to its health-promoting activities against a variety of diseases. However, developing feasible and efficient microbial processes remains challenging owing to the requirement of supplementing expensive phenylpropanoic precursors. Here, various metabolic engineering strategies were developed for efficient de novo biosynthesis of resveratrol. A recombinant malonate assimilation pathway from Rhizobium trifolii was introduced to increase the supply of the key precursor malonyl-CoA and simultaneously, the clustered regularly interspaced short palindromic repeats interference system was explored to down-regulate fatty acid biosynthesis pathway to inactivate the malonyl-CoA consumption pathway...
March 21, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28324011/a-novel-fc-fgf21-with-improved-resistance-to-proteolysis-increased-affinity-towards-%C3%AE-klotho-and-enhanced-efficacy-in-mice-and-cynomolgus-monkeys
#9
Shanaka Stanislaus, Randy Hecht, Junming Yie, Todd Hager, Michael Hall, Chris Spahr, Wei Wang, Jennifer Weiszmann, Yang Li, Liying Deng, Dwight Winters, Stephen Smith, Lei Zhou, Yuesheng Li, Murielle M Véniant, Jing Xu
FGF21 is a natural hormone that modulates glucose, lipid, and energy metabolism. Previously, we engineered an Fc fusion FGF21 variant with two mutations, Fc-FGF21(RG), to extend the half-life and reduce aggregation and in vivo degradation of FGF21. We now describe a new variant developed to reduce the extreme C-terminal degradation and improve the binding affinity to β-Klotho. We demonstrate, by introducing one additional mutation located at the C-terminus of FGF21 (A180E) that the new molecule, Fc-FGF21(RGE), has gained many improved attributes...
January 26, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323063/lipid-engineering-reveals-regulatory-roles-for-membrane-fluidity-in-yeast-flocculation-and-oxygen-limited-growth
#10
Daniel Degreif, Tristan de Rond, Adam Bertl, Jay D Keasling, Itay Budin
Cells modulate lipid metabolism in order to maintain membrane homeostasis. Here we use a metabolic engineering approach to manipulate the stoichiometry of fatty acid unsaturation, a regulator of cell membrane fluidity, in Saccharomyces cerevisiae. Unexpectedly, reduced lipid unsaturation triggered cell-cell adhesion (flocculation), a phenomenon characteristic of industrial yeast but uncommon in laboratory strains. We find that ER lipid saturation sensors induce expression of FLO1 - encoding a cell wall polysaccharide binding protein - independently of its canonical regulator...
March 16, 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/28319856/systems-biology-solutions-for-biochemical-production-challenges
#11
REVIEW
Anne Sofie Lærke Hansen, Rebecca M Lennen, Nikolaus Sonnenschein, Markus J Herrgård
There is an urgent need to significantly accelerate the development of microbial cell factories to produce fuels and chemicals from renewable feedstocks in order to facilitate the transition to a biobased society. Methods commonly used within the field of systems biology including omics characterization, genome-scale metabolic modeling, and adaptive laboratory evolution can be readily deployed in metabolic engineering projects. However, high performance strains usually carry tens of genetic modifications and need to operate in challenging environmental conditions...
March 16, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28319854/extremely-thermophilic-energy-metabolisms-biotechnological-prospects
#12
REVIEW
Christopher T Straub, Benjamin M Zeldes, Gerrit J Schut, Michael Ww Adams, Robert M Kelly
New strategies for metabolic engineering of extremely thermophilic microorganisms to produce bio-based fuels and chemicals could leverage pathways and physiological features resident in extreme thermophiles for improved outcomes. Furthermore, very recent advances in genetic tools for these microorganisms make it possible for them to serve as metabolic engineering hosts. Beyond providing a higher temperature alternative to mesophilic platforms, exploitation of strategic metabolic characteristics of high temperature microorganisms grants new opportunities for biotechnological products...
March 16, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28318948/comparative-assessment-of-intrinsic-mechanical-stimuli-on-knee-cartilage-and-compressed-agarose-constructs
#13
A Completo, C Bandeiras, F Fonseca
A well-established cue for improving the properties of tissue-engineered cartilage is mechanical stimulation. However, the explicit ranges of mechanical stimuli that correspond to favorable metabolic outcomes are elusive. Usually, these outcomes have only been associated with the applied strain and frequency, an oversimplification that can hide the fundamental relationship between the intrinsic mechanical stimuli and the metabolic outcomes. This highlights two important key issues: the firstly is related to the evaluation of the intrinsic mechanical stimuli of native cartilage; the second, assuming that the intrinsic mechanical stimuli will be important, deals with the ability to replicate them on the tissue-engineered constructs...
March 17, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28318939/early-metabolic-improvement-after-bariatric-surgery-the-first-steps-toward-remission-of-type-2-diabetes
#14
REVIEW
Thomas Grenier-Larouche, Anne-Marie Carreau, André C Carpentier
The introduction of bariatric surgery into clinical practice in the 1980s was followed by a relatively long watch-and-wait period before the very rapid accumulation of scientific literature, over the past decade, concerning its clinical effectiveness and safety and its mechanisms of action in the treatment of obesity. These surgical procedures now emerge as the most effective therapeutic modality to induce long-term remission of type 2 diabetes. Recent research has shed light on the potential mechanisms leading to the profound improvement of glucose homeostasis following most bariatric surgery procedures...
March 17, 2017: Canadian Journal of Diabetes
https://www.readbyqxmd.com/read/28317865/complete-genome-sequencing-and-antibiotics-biosynthesis-pathways-analysis-of-streptomyces-lydicus-103
#15
Nan Jia, Ming-Zhu Ding, Hao Luo, Feng Gao, Ying-Jin Yuan
More and more new natural products have been found in Streptomyces species, which become the significant resource for antibiotics production. Among them, Streptomyces lydicus has been known as its ability of streptolydigin biosynthesis. Herein, we present the genome analysis of S. lydicus based on the complete genome sequencing. The circular chromosome of S. lydicus 103 comprises 8,201,357 base pairs with average GC content 72.22%. With the aid of KEGG analysis, we found that S. lydicus 103 can transfer propanoate to succinate, glutamine or glutamate to 2-oxoglutarate, CO2 and L-glutamate to ammonia, which are conducive to the the supply of amino acids...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28316259/the-adipose-stromal-vascular-fraction-as-a-complex-cellular-source-for-tissue-engineering-applications
#16
Venkat M Ramakrishnan, Nolan L Boyd
A major challenge in tissue engineering is the generation of sufficient volumes of viable tissue for organ transplant. The development of a stable, mature vasculature is required to sustain the metabolic and functional activities of engineered tissues. Adipose stromal vascular fraction (SVF) cells are an easily accessible, heterogeneous cell system comprised of endothelial cells, macrophages, pericytes, and various stem cell populations. Collectively, SVF has been shown to spontaneously form vessel-like networks in vitro and robust, patent, and functional vasculatures in vivo...
March 19, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28306234/whole-community-metagenomics-in-two-different-anammox-configurations-process-performance-and-community-structure
#17
Ananda S Bhattacharjee, Sha Wu, Christopher E Lawson, Mike S M Jetten, Vikram Kapoor, Jorge W Santo Domingo, Katherine D McMahon, Daniel R Noguera, Ramesh Goel
Anaerobic-ammonia-oxidation (anammox) combined with partial-nitritation (PN) is an innovative treatment process for energy-efficient nitrogen removal from wastewater. In this study, we used genome-based metagenomics to investigate the overall community structure and anammox species enriched in suspended growth (SGR) and attached growth packed bed (AGR) anammox reactors after 220 days of operation. Both reactors removed more than 85% of the total inorganic nitrogen. Metagenomic binning and phylogenetic analysis revealed that two anammox population genomes, affiliated with the genus 'Candidatus Brocadia', were differentially abundant between the SGR and AGR...
March 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28303994/association-of-il-6-c-174g-rs-1800795-single-nucleotide-polymorphism-with-type-2-diabetes-mellitus-in-pakistani-population
#18
Amina Nadeem, Sadaf Mumtaz, Abdul Khaliq Naveed, Qaiser Mansoor, Muhammad Aslam, Arif Siddiqui, Muhammad Ismail
OBJECTIVE: To determine the association of interleukin-6 C-174G single nucleotide polymorphism with type 2 diabetes mellitus and metabolic parameters. METHODS: This case-control study was conducted from June 2012 to December 2013 at the Military Hospital Rawalpindi, the Centre for Research in Experimental and Applied Medicine, Army Medical College, Rawalpindi, and the Institute of Biomedical and Genetic Engineering, Islamabad, Pakistan. Two cohorts of subjects were genotyped for the single nucleotide polymorphism...
March 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28303457/lipid-metabolism-and-potentials-of-biofuel-and-high-added-value-oil-production-in-red-algae
#19
REVIEW
Naoki Sato, Takashi Moriyama, Natsumi Mori, Masakazu Toyoshima
Biomass production is currently explored in microalgae, macroalgae and land plants. Microalgal biofuel development has been performed mostly in green algae. In the Japanese tradition, macrophytic red algae such as Pyropia yezoensis and Gelidium crinale have been utilized as food and industrial materials. Researches on the utilization of unicellular red microalgae such as Cyanidioschyzon merolae and Porphyridium purpureum started only quite recently. Red algae have relatively large plastid genomes harboring more than 200 protein-coding genes that support the biosynthetic capacity of the plastid...
April 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28303150/development-of-synebrick-vectors-as-a-synthetic-biology-platform-for-gene-expression-in-synechococcus-elongatus-pcc-7942
#20
Wook Jin Kim, Sun-Mi Lee, Youngsoon Um, Sang Jun Sim, Han Min Woo
Cyanobacteria are oxygenic photosynthetic prokaryotes that are able to assimilate CO2 using solar energy and water. Metabolic engineering of cyanobacteria has suggested the possibility of direct CO2 conversion to value-added chemicals. However, engineering of cyanobacteria has been limited due to the lack of various genetic tools for expression and control of multiple genes to reconstruct metabolic pathways for biochemicals from CO2. Thus, we developed SyneBrick vectors as a synthetic biology platform for gene expression in Synechococcus elongatus PCC 7942 as a model cyanobacterium...
2017: Frontiers in Plant Science
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