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https://www.readbyqxmd.com/read/28433188/metabolic-engineering-of-saccharomyces-cerevisiae-for-production-of-spermidine-under-optimal-culture-conditions
#1
Sun-Ki Kim, Jung-Hyun Jo, Yong-Cheol Park, Yong-Su Jin, Jin-Ho Seo
Spermidine is a polyamine compound exhibiting important biological activities, such as increasing lifespan, inflammation reduction, and plant growth control. As such, many applications of spermidine as a bio-modulating agent are anticipated. However, sustainable and scalable production of spermidine has not been achieved yet. Therefore, construction of a spermidine production system using Saccharomyces cerevisiae was attempted in this study. In order to secrete spermidine into fermentation broth, TPO1 coding for the polyamine transporter was overexpressed in an engineered S...
June 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28432390/biomass-resources-agriculture
#2
Ingeborg N Kluts, Marnix L J Brinkman, Sierk A de Jong, H Martin Junginger
Bioenergy is the single largest source of renewable energy in the European Union (EU-28); of this, 14% was produced from agricultural feedstocks in 2012. This chapter provides an overview of the current use (for bioenergy) and future potential of agricultural feedstocks for (amongst others) biorefinery purposes in the European Union. The main application of these feedstocks is currently the production of biofuels for road transport. Biodiesel makes up 80% of the European biofuel production, mainly from rapeseed oil, and the remaining part is bioethanol from wheat and sugar beet...
April 22, 2017: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/28432302/a-bacterial-abc-transporter-enables-import-of-mammalian-host-glycosaminoglycans
#3
Sayoko Oiki, Bunzo Mikami, Yukie Maruyama, Kousaku Murata, Wataru Hashimoto
Glycosaminoglycans (GAGs), such as hyaluronan, chondroitin sulfate, and heparin, constitute mammalian extracellular matrices. The uronate and amino sugar residues in hyaluronan and chondroitin sulfate are linked by 1,3-glycoside bond, while heparin contains 1,4-glycoside bond. Some bacteria target GAGs as means of establishing colonization and/or infection, and bacterial degradation mechanisms of GAGs have been well characterized. However, little is known about the bacterial import of GAGs. Here, we show a GAG import system, comprised of a solute-binding protein (Smon0123)-dependent ATP-binding cassette (ABC) transporter, in the pathogenic Streptobacillus moniliformis...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432102/two-distinct-%C3%AE-l-arabinofuranosidases-in-caldicellulosiruptor-species-drive-degradation-of-arabinose-based-polysaccharides
#4
Md Abu Saleh, Wen-Jie Han, Ming Lu, Bing Wang, Huayue Li, Robert M Kelly, Fu-Li Li
Species in the extremely thermophilic genus Caldicellulosiruptor can degrade unpretreated plant biomass through the action of multi-modular glycoside hydrolases. To date, most focus with these bacteria has been on hydrolysis of glucans and xylans, while biodegradation mechanism for arabinose-based polysaccharides remains unclear. Here, putative α-L-arabinofuranosidases (AbFs) were identified in Caldicellulosiruptor species by homology to less thermophilic versions of these enzymes. From this screen, an extracellular XynF was determined to be a key factor in hydrolyzing α-1,2-, α-1,3-, and α-1,5-L-arabinofuranosyl residues of arabinose-based polysaccharides...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28429873/sucrose-transporters-and-plasmodesmal-regulation-in-passive-phloem-loading
#5
Johannes Liesche
An essential step for the distribution of carbon throughout the whole plant is the loading of sugars into the phloem in source organs. In many plants, accumulation of sugars in the sieve element-companion cell (SE-CC) complex is mediated and regulated by active processes. However, for poplar and many other tree species, a passive symplasmic mechanism of phloem loading has been proposed, characterized by symplasmic continuity along the pre-phloem pathway and the absence of active sugar accumulation in the SE-CC complex...
April 21, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28424722/the-role-of-auxin-ethylene-crosstalk-in-orchestrating-primary-root-elongation-in-sugar-beet
#6
Willem Abts, Bert Vandenbussche, Maurice P De Proft, Bram Van de Poel
It is well-established in Arabidopsis and other species that ethylene inhibits root elongation through the action of auxin. In sugar beet (Beta vulgaris L.) ethylene promotes root elongation in a concentration dependent manner. However, the crosstalk between ethylene and auxin remains unknown during sugar beet seedling development. Our experiments have shown that exogenously applied auxin (indole-3-acetic acid; IAA) also stimulates root elongation. We also show that auxin promotes ethylene biosynthesis leading to longer roots...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28411960/age-and-gender-influences-on-the-needs-concerns-and-strategies-of-cabg-caregivers
#7
Margo A Halm
BACKGROUND: Caring for coronary artery bypass (CABG) surgery patients can be challenging. No studies have explored caregiver burden by age and gender. OBJECTIVE: To describe age and gender-specific concerns, needs and strategies during the first 3 months. METHODS: Themes for burden concerns, needs and strategies were derived from interviews of 32 CABG caregivers using constant comparative analysis. RESULTS: Age-specific themes related to motivating exercise (<70), applying support hose, and self-reliance (>70)...
April 12, 2017: Heart & Lung: the Journal of Critical Care
https://www.readbyqxmd.com/read/28407382/carbohydrate-uptake-in-advenella-mimigardefordensis-strain-dpn7t-is-mediated-by-periplasmic-sugar-oxidation-and-a-trap-transport-system
#8
Christina Meinert, Jana Senger, Marco Witthohn, Jan Hendrik Wübbeler, Alexander Steinbüchel
In this study, we investigated an SBP (DctPAm) of a tripartite ATP-independent periplasmic transport system (TRAP) in Advenella mimigardefordensis strain DPN7(T) . Deletion of dctPAm as well as of the two transmembrane compounds of the tripartite transporter, dctQ and dctM, impaired growth of A. mimigardefordensis strain DPN7(T) , if cultivated on mineral salt medium supplemented with D-glucose, D-galactose, L-arabinose, D-fucose, D-xylose or D-gluconic acid, respectively. The wild type phenotype was restored during complementation studies of A...
April 13, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28407314/on-the-pull-periplasmic-trapping-of-sugars-before-transport
#9
Gavin Thomas
No abstract text is available yet for this article.
April 13, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28403831/the-role-of-tre6p-and-snrk1-in-maize-early-kernel-development-and-events-leading-to-stress-induced-kernel-abortion
#10
Samuel W Bledsoe, Clémence Henry, Cara A Griffiths, Matthew J Paul, Regina Feil, John E Lunn, Mark Stitt, L Mark Lagrimini
BACKGROUND: Drought stress during flowering is a major contributor to yield loss in maize. Genetic and biotechnological improvement in yield sustainability requires an understanding of the mechanisms underpinning yield loss. Sucrose starvation has been proposed as the cause for kernel abortion; however, potential targets for genetic improvement have not been identified. Field and greenhouse drought studies with maize are expensive and it can be difficult to reproduce results; therefore, an in vitro kernel culture method is presented as a proxy for drought stress occurring at the time of flowering in maize (3 days after pollination)...
April 12, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28398082/transcriptomic-response-of-arabidopsis-thaliana-l-heynh-roots-to-ibuprofen
#11
Premysl Landa, Sylva Prerostova, Lenka Langhansova, Petr Marsik, Tomas Vanek
Surface waters in urban areas are contaminated by ibuprofen (IBP), a popular and extensively used anti-inflammatory drug. In this study, we investigated the transcriptomic response in Arabidopsis thaliana (L.) Heynh. roots with the aim of revealing genes that are potentially involved in IBP detoxification and to elucidate the effect of IBP on plants. IBP up-regulated 63 and down-regulated 38 transcripts (p-value < 0.1, fold change ≥ 2) after two-day exposure to a 5 µM (1.03 mg L(-1)) concentration of IBP under hydroponic conditions...
April 11, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28392784/structure-and-function-of-the-fecal-microbiota-in-diarrheic-neonatal-piglets
#12
Qiaoli Yang, Xiaoyu Huang, Shengguo Zhao, Wenyang Sun, Zunqiang Yan, Pengfei Wang, Shenggui Li, Wangzhou Huang, Shengwei Zhang, Lixia Liu, Shuangbao Gun
Diarrhea is a leading cause of increased mortality in neonatal and young piglets. Aberration of the gut microbiota is one important factor in the etiology of piglet diarrhea. However, information regarding the structure and function of the gut microbiome in diarrheic neonatal piglets is limited. To investigate the composition and functional potential of the fecal microbiota in neonatal piglets, we performed 16S rRNA gene sequencing on 20 fecal samples from diarrheic piglets and healthy controls, and metagenomics sequencing on a subset of six samples...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28392608/stem-girdling-indicates-prioritized-carbon-allocation-to-the-root-system-at-the-expense-of-radial-stem-growth-in-norway-spruce-under-drought-conditions
#13
Walter Oberhuber, Andreas Gruber, Gina Lethaus, Andrea Winkler, Gerhard Wieser
The early culmination of maximum radial growth (RG) in late spring has been found in several coniferous species in a dry inner Alpine environment. We hypothesized that an early decrease in RG is an adaptation to cope with drought stress, which might require an early switch of carbon (C) allocation to belowground organs. To test this hypothesis, we experimentally subjected six-year-old Norway spruce saplings (tree height: 1.35 m; n = 80 trees) to two levels of soil water availability (watered versus drought conditions) and manipulated tree C status by physically blocking phloem transport at three girdling dates (GD)...
June 2017: Environmental and Experimental Botany
https://www.readbyqxmd.com/read/28392541/analysis-of-strain-specific-genes-in-glutamic-acid-producing-corynebacterium-glutamicum-ssp-lactofermentum-aj-1511
#14
Yousuke Nishio, Chie Koseki, Naoto Tonouchi, Kazuhiko Matsui, Shinichi Sugimoto, Yoshihiro Usuda
Strains of the bacterium, Corynebacterium glutamicum, are widely used for the industrial production of L-glutamic acid and various other substances. C. glutamicum ssp. lactofermentum AJ 1511, formerly classified as Brevibacterium lactofermentum, and the closely related C. glutamicum ATCC 13032 have been used as industrial strains for more than 50 years. We determined the whole genome sequence of C. glutamicum AJ 1511 and performed genome-wide comparative analysis with C. glutamicum ATCC 13032 to determine strain-specific genetic differences...
April 7, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/28392107/strigolactone-and-karrikin-independent-smxl-proteins-are-central-regulators-of-phloem-formation
#15
Eva-Sophie Wallner, Vadir López-Salmerón, Ilya Belevich, Gernot Poschet, Ilona Jung, Karin Grünwald, Iris Sevilem, Eija Jokitalo, Rüdiger Hell, Yrjö Helariutta, Javier Agustí, Ivan Lebovka, Thomas Greb
Plant stem cell niches, the meristems, require long-distance transport of energy metabolites and signaling molecules along the phloem tissue. However, currently it is unclear how specification of phloem cells is controlled. Here we show that the genes SUPPRESSOR OF MAX2 1-LIKE3 (SMXL3), SMXL4, and SMXL5 act as cell-autonomous key regulators of phloem formation in Arabidopsis thaliana. The three genes form an uncharacterized subclade of the SMXL gene family that mediates hormonal strigolactone and karrikin signaling...
March 28, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28389042/microreactor-based-mixing-strategy-suppresses-product-inhibition-to-enhance-sugar-yields-in-enzymatic-hydrolysis-for-cellulosic-biofuel-production
#16
Saikat Chakraborty, Prasun Kumar Singh, Pawan Paramashetti
A novel microreactor-based energy-efficient process of using complete convective mixing in a macroreactor till an optimal mixing time followed by no mixing in 200-400μl microreactors enhances glucose and reducing sugar yields by upto 35% and 29%, respectively, while saving 72-90% of the energy incurred on reactor mixing in the enzymatic hydrolysis of cellulose. Empirical exponential relations are provided for determining the optimal mixing time, during which convective mixing in the macroreactor promotes mass transport of the cellulase enzyme to the solid Avicel substrate, while the latter phase of no mixing in the microreactor suppresses product inhibition by preventing the inhibitors (glucose and cellobiose) from homogenizing across the reactor...
March 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28387741/effects-of-low-molecular-weight-fucoidan-and-high-stability-fucoxanthin-on-glucose-homeostasis-lipid-metabolism-and-liver-function-in-a-mouse-model-of-type-ii-diabetes
#17
Hong-Ting Victor Lin, Yu-Chi Tsou, Yu-Ting Chen, Wen-Jung Lu, Pai-An Hwang
The combined effects of low-molecular-weight fucoidan (LMF) and fucoxanthin (Fx) in terms of antihyperglycemic, antihyperlipidemic, and hepatoprotective activities were investigated in a mouse model of type II diabetes. The intake of LMF, Fx, and LMF + Fx lowered the blood sugar and fasting blood sugar levels, and increased serum adiponectin levels. The significant decrease in urinary sugar was only observed in LMF + Fx supplementation. LMF and Fx had ameliorating effects on the hepatic tissue of db/db mice by increasing hepatic glycogen and antioxidative enzymes, and LMF was more effective than Fx at improving hepatic glucose metabolism...
April 7, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28385528/mannose-conjugated-platinum-complexes-reveals-effective-tumor-targeting-mediated-by-glucose-transporter-1
#18
Ran Liu, Hong Li, Xiangqian Gao, Qian Mi, Hongxia Zhao, Qingzhi Gao
Despite numerous studies that report the glucose derived glycoconjugates as antitumor candidates, using mannose as sugar motif for specific tumor targeting remains less studied. In this research, two novel mannose-conjugated platinum complexes 4a and 4b that target the Warburg effect were designed, synthesized and evaluated for their antitumor activities in vitro and in vivo. Compared with oxaliplatin, both complexes exhibited substantial enhancement in water solubility as well as excellent or comparative cytotoxicity in six human cancer cell lines...
April 3, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28378090/solute-carrier-organic-anion-transporter-family-member-4a1-slco4a1-as-a-prognosis-marker-of-colorectal-cancer
#19
Myung Jin Ban, Sang Hee Ji, Chi-Kyu Lee, Sang Byung Bae, Han Jo Kim, Tae Sung Ahn, Moon Soo Lee, Moo-Jun Baek, Dongjun Jeong
PURPOSE: Solute carrier organic anion transporter family member 4A1 (SLCO4A1) is involved in the transport of various compounds, including sugars, bile salts, organic acids, metal ions, amine compounds, and estrogen. SLCO4A1 is highly expressed in several cancers and a gender bias has been observed in colorectal cancer (CRC). We investigated SLCO4A1 expression, its prognostic value in patients with CRC, and its role in CRC cell proliferation and metastasis. METHODS: SLCO4A1 expression was assessed by immunohistochemistry (IHC) on specimens from 84 patients with CRC...
April 4, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28377780/pseudomonas-fluorescens-transportome-is-linked-to-strain-specific-plant-growth-promotion-in-aspen-seedlings-under-nutrient-stress
#20
Shalaka Shinde, Jonathan R Cumming, Frank R Collart, Philippe H Noirot, Peter E Larsen
Diverse communities of bacteria colonize plant roots and the rhizosphere. Many of these rhizobacteria are symbionts and provide plant growth promotion (PGP) services, protecting the plant from biotic and abiotic stresses and increasing plant productivity by providing access to nutrients that would otherwise be unavailable to roots. In return, these symbiotic bacteria receive photosynthetically-derived carbon (C), in the form of sugars and organic acids, from plant root exudates. PGP activities have been characterized for a variety of forest tree species and are important in C cycling and sequestration in terrestrial ecosystems...
2017: Frontiers in Plant Science
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