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https://www.readbyqxmd.com/read/28330311/scaling-up-a-virginiamycin-production-by-a-high-yield-streptomyces-virginiae-vkm-ac-2738d-strain-using-adsorbing-resin-addition-and-fed-batch-fermentation-under-controlled-conditions
#1
Vakhtang Dzhavakhiya, Vyacheslav Savushkin, Alexander Ovchinnikov, Vladislav Glagolev, Veronika Savelyeva, Evgeniya Popova, Nikita Novak, Elena Glagoleva
Virginiamycin produced by Streptomyces virginiae as a natural mix of macrocyclic peptidolactones M and S is widely used in the industrial production of ethanol fuel and as an antibiotic feed additive for cattle and poultry. Its main antimicrobial components, M1 and S1 factors, act synergistically if the M1:S1 ratio in the final product is 70-75:25-30. This fact significantly complicates the development of stable high-yield strains suitable for industrial application. In the previous work, authors obtained a mutant S...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330286/effect-of-highly-branched-hyphal-morphology-on-the-enhanced-production-of-cellulase-in-trichoderma-reesei-des-15
#2
Ronglin He, Chen Li, Lijuan Ma, Dongyuan Zhang, Shulin Chen
The morphology of Trichoderma reesei is a vitally important factor for cellulase productivity. This study investigated the effect of hyphal morphology on cellulase production in the hyper-cellulolytic mutant, T. reesei DES-15. With a distinct morphology, T. reesei DES-15 was obtained through Diethyl sulfite (DES) mutagenesis. The hyphal morphology of DES-15 batch-cultured in a 5-L fermentor was significantly shorter and more branched than the parental strain RUT C30. The cellulase production of DES-15 during batch fermentation was 66 % greater than that of RUT C30 when cultured the same conditions...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28322433/a-9-pool-metabolic-structured-kinetic-model-describing-days-to-seconds-dynamics-of-growth-and-product-formation-by-penicillium-chrysogenum
#3
Wenjun Tang, Amit T Deshmukh, Cees Haringa, Guan Wang, Walter van Gulik, Wouter van Winden, Matthias Reuss, Joseph J Heijnen, Jianye Xia, Ju Chu, Henk J Noorman
A powerful approach for the optimization of industrial bioprocesses is to perform detailed simulations integrating large scale computational fluid dynamics (CFD) and cellular reaction dynamics (CRD). However, complex metabolic kinetic models containing a large number of equations pose formidable challenges in CFD-CRD coupling and computation time afterward. This necessitates to formulate a relatively simple but yet representative model structure. Such a kinetic model should be able to reproduce metabolic responses for short-term (mixing time scale of tens of seconds) and long-term (fed-batch cultivation of hours/days) dynamics in industrial bioprocesses...
March 21, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28285222/efficient-production-of-lactulose-from-whey-powder-by-cellobiose-2-epimerase-in-an-enzymatic-membrane-reactor
#4
Lingtian Wu, Cen Xu, Sha Li, Jinfeng Liang, Hong Xu, Zheng Xu
In this study, the gene encoding cellobiose 2-epimerase from Caldicellulosiruptor saccharolyticus (CsCE) was successfully expressed in Bacillus subtilis WB800. After the fermentation medium optimization, the activity of recombinant strain was 4.5-fold higher than the original medium in a 7.5L fermentor. The optimal catalytic pH and temperature of crude CsCE were 7.0 and 80°C, respectively. An enzymatic synthesis of lactulose was developed using cheese-whey lactose as its substrate. The maximum conversion rate of whey powder obtained was 58...
March 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28278108/influence-of-al-3-on-the-titer-of-spiramycin-and-effective-components-in-fermentor
#5
Zhen Li, Fengxian Hu, Ruifang Ye, Heping Lv, Jun Zeng
Spiramycin is a multi-component antibiotic and different components have different antibacterial activities. In Streptomyces spiramyceticus16-10-2, SPMII and SPMIII (spiramycin II and spiramycin III) are the main components, while SPMI (spiramycin I) need to be controlled below 12%. Based on this, the influences of Al(3+) on total spiramycin titer and components were investigated in this work. Those experiments were mainly performed in 15 L fermentor and Al(3+) made a great improvement in spiramycin titer...
February 17, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28274103/expression-and-characterization-of-a-single-chain-variable-fragment-against-human-lox-1-in-escherichia-coli-and-brevibacillus-choshinensis
#6
Wei Hu, Jun-Yan Xiang, Ping Kong, Ling Liu, Qiuhong Xie, Hongyu Xiang
The single-chain variable fragment (scFv) against lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is a promising molecule for its potential use in the diagnosis and immunotherapy of atherosclerosis. Producing this scFv in several milligram amounts could be the starting point for further engineering and application of the scFv. In this study, the abundant expression of the anti-LOX-1 scFv was attempted using Escherichia coli (E. coli) and Brevibacillus choshinensis (B. choshinensis). The scFv had limited soluble yield in E...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28261538/efficient-expression-of-sortase-a-from-staphylococcus-aureus-in-escherichia-coli-and-its-enzymatic-characterizations
#7
Zhimeng Wu, Haofei Hong, Xinrui Zhao, Xun Wang
BACKGROUND: Sortase A (SrtA) is a transpeptidase found in Staphylococcus aureus, which is widely used in site-specific protein modification. However, SrtA was expressed in Escherichia coli (E. coli) in rather low level (ranging from several milligrams to 76.9 mg/L at most). The present study aims to optimize fermentation conditions for improving SrtA expression in E. coli. RESULTS: Under the optimized media (0.48 g/L glycerol, 1.37 g/L tryptone, 0.51 g/L yeast extract, MOPS 0...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28191448/a-food-grade-expression-system-for-d-psicose-3-epimerase-production-in-bacillus-subtilis-using-an-alanine-racemase-encoding-selection-marker
#8
Jingqi Chen, Zhaoxia Jin, Yuanming Gai, Jibin Sun, Dawei Zhang
BACKGROUND: Food-grade expression systems require that the resultant strains should only contain materials from food-safe microorganisms, and no antibiotic resistance marker can be utilized. To develop a food-grade expression system for d-psicose 3-epimerase production, we use an alanine racemase-encoding gene as selection marker in Bacillus subtilis. RESULTS: In this study, the d-alanine racemase-encoding gene dal was deleted from the chromosome of B. subtilis 1A751 using Cre/lox system to generate the food-grade host...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28186321/plasmid-encoded-biosynthetic-genes-alleviate-metabolic-disadvantages-while-increasing-glucose-conversion-to-shikimate-in-an-engineered-escherichia-coli-strain
#9
Alberto Rodriguez, Juan A Martínez, Pierre Millard, Guillermo Gosset, Jean-Charles Portais, Fabien Létisse, Francisco Bolivar
Metabolic engineering strategies applied over the last two decades to produce shikimate (SA) in Escherichia coli have resulted in a battery of strains bearing many expression systems. However, the effects that these systems have on the host physiology and how they impact the production of SA are still not well understood. In this work we utilized an engineered E. coli strain to determine the consequences of carrying a vector that promotes SA production from glucose with a high yield but that is also expected to impose a significant cellular burden...
February 10, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28178978/enhanced-extracellular-production-of-recombinant-proteins-in-escherichia-coli-by-co-expression-with-bacillus-cereus-phospholipase-c
#10
Lingqia Su, Qi Jiang, Lingang Yu, Jing Wu
BACKGROUND: Our laboratory has reported a strategy for improving the extracellular production of recombinant proteins through co-expression with Thermobifida fusca cutinase, which increases membrane permeability via its phospholipid hydrolysis activity. However, the foam generated by the lysophospholipid product makes the fermentation process difficult to control in a fermentor. Phospholipase C (PLC) catalyzes the hydrolysis of phospholipids to produce sn1,2-diacylglycerides and organic phosphate, which do not induce foam formation...
February 8, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28089378/butyrate-production-under-aerobic-growth-conditions-by-engineered-escherichia-coli
#11
Naoya Kataoka, Alisa S Vangnai, Thunyarat Pongtharangkul, Toshiharu Yakushi, Kazunobu Matsushita
Butyrate is an important industrial platform chemical. Although several groups have reported butyrate production under oxygen-limited conditions by a native producer, Clostridium tyrobutylicum, and by a metabolically engineered Escherichia coli, efforts to produce butyrate under aerobic growth conditions have met limited success. Here, we constructed a novel butyrate synthetic pathway that functions under aerobic growth conditions in E. coli, by modifying the 1-butanol synthetic pathway reported previously...
January 11, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28050846/optimization-of-medium-compositions-to-improve-a-novel-glycoprotein-production-by-streptomyces-kanasenisi-zx01
#12
Yong Zhou, Yu-Bo Sun, Hong-Wei He, Jun-Tao Feng, Xing Zhang, Li-Rong Han
Streptomyces kanasenisi ZX01 was found to produce a novel glycoprotein GP-1 previously, which was secreted into medium and had significant activity against tobacco mosaic virus. However, the low production of GP-1 by strain ZX01 limited its further studies. In order to improve the yield of GP-1, a series of statistical experimental design methods were applied to optimize medium of strain ZX01 in this work. Millet medium was chosen to be the optimal original medium for optimization. Soluble starch and yeast extract were identified as the optimal carbon and nitrogen source using one-factor-at-a-time method...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28032228/sweet-sorghum-bagasse-and-corn-stover-serving-as-substrates-for-producing-sophorolipids
#13
Abdul Samad, Ji Zhang, Da Chen, Xiaowen Chen, Melvin Tucker, Yanna Liang
To make the process of producing sophorolipids by Candida bombicola truly sustainable, we investigated production of these biosurfactants on biomass hydrolysates. This study revealed: (1) yield of sophorolipds on bagasse hydrolysate decreased from 0.56 to 0.54 and to 0.37 g/g carbon source when yellow grease was dosed at 10, 40 and 60 g/L, respectively. In the same order, concentration of sophorolipids was 35.9, 41.9, and 39.3 g/L; (2) under similar conditions, sophorolipid yield was 0.12, 0.05 and 0.04 g/g carbon source when corn stover hydrolysate was mixed with soybean oil at 10, 20 and 40 g/L...
December 28, 2016: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/27959775/ruficoccus-amylovorans-gen-nov-sp-nov-an-amylolytic-and-nitrate-reducing-diazotroph-of-the-family-puniceicoccaceae
#14
Shih-Yao Lin, Asif Hameed, You-Cheng Liu, Yi-Han Hsu, Mei-Hua Hung, Wei-An Lai, Chiu-Chung Young
A novel amylolytic, nitrate-reducing and diazotrophic bacterium, designated strain CC-MHH0563T, isolated from a fermentor was assessed for its taxonomic status using polyphasic taxonomy. Cells of strain CC-MHH0563T was Gram-staining-negative, catalase- and oxidase-positive, mesophilic and aerobic cocci, which produced reddish nondiffusible-pigments. Growth was observed at 15-37 ºС (optimal 25 ºС), pH 6.0-8.0 (optimal pH 7.0) and salinity (0-3 %, w/v). Strain CC-MHH0563T showed highest pair-wise 16S rRNA gene sequence similarity to the members of genera Cerasicoccus (89...
December 12, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27939544/effect-of-feeding-warm-season-annuals-with-orchardgrass-on-ruminal-fermentation-and-methane-output-in-continuous-culture
#15
S L Dillard, A N Hafla, A I Roca-Fernández, A F Brito, M D Rubano, K J Soder
A 4-unit, dual-flow continuous culture fermentor system was used to assess nutrient digestibility, volatile fatty acids (VFA) production, bacterial protein synthesis, and methane (CH4) output of warm-season annual grasses. Treatments were randomly assigned to fermentors in a 4 × 4 Latin square design using 7 d for adaptation to treatment and 3 d for sample collection. Treatments were (1) 100% orchardgrass (Dactylis glomerata L.; ORD); (2) 50% orchardgrass + 50% Japanese millet [Echinochloa esculenta (A. Braun) H...
February 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/27917102/euler-lagrange-computational-fluid-dynamics-for-bio-reactor-scale-down-an-analysis-of-organism-lifelines
#16
Cees Haringa, Wenjun Tang, Amit T Deshmukh, Jianye Xia, Matthias Reuss, Joseph J Heijnen, Robert F Mudde, Henk J Noorman
The trajectories, referred to as lifelines, of individual microorganisms in an industrial scale fermentor under substrate limiting conditions were studied using an Euler-Lagrange computational fluid dynamics approach. The metabolic response to substrate concentration variations along these lifelines provides deep insight in the dynamic environment inside a large-scale fermentor, from the point of view of the microorganisms themselves. We present a novel methodology to evaluate this metabolic response, based on transitions between metabolic "regimes" that can provide a comprehensive statistical insight in the environmental fluctuations experienced by microorganisms inside an industrial bioreactor...
October 2016: Engineering in Life Sciences
https://www.readbyqxmd.com/read/27897254/high-level-expression-of-improved-thermo-stable-alkaline-xylanase-variant-in-pichia-pastoris-through-codon-optimization-multiple-gene-insertion-and-high-density-fermentation
#17
Yihong Lu, Cheng Fang, Qinhong Wang, Yuling Zhou, Guimin Zhang, Yanhe Ma
In paper industry, xylanases are used to increase the pulp properties in bleaching process as its eco-friendly nature. The xylanases activity is hindered by high temperature and alkaline conditions with high enzyme production cost in the paper industry. Here, XynHB, an alkaline stable xylanase from Bacillus pumilus HBP8 was mutated at N188A to XynHBN188A. Expressed mutant in E. coli showed 1.5-fold higher xylanase activity than XynHB at 60 °C. The mutant expressed in Pichia pastoris was glycosylated, remained stable for 30 min at 60 °C...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27861744/omega-3-production-by-fermentation-of-yarrowia-lipolytica-from-fed-batch-to-continuous
#18
Dongming Xie, Edward Miller, Pamela Sharpe, Ethel Jackson, Quinn Zhu
The omega-3 fatty acid, cis-5,8,11,14,17-eicosapentaenoic acid (C20:5; EPA) has wide-ranging benefits in improving heart health, immune function, and mental health. A sustainable source of EPA production through fermentation of metabolically engineered Yarrowia lipolytica has been developed. In this paper, key fed-batch fermentation conditions were identified to achieve 25% EPA in the yeast biomass, which is so far the highest EPA titer reported in the literature. Dynamic models of the EPA fermentation process were established for analyzing, optimizing, and scaling up the fermentation process...
November 14, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27855390/the-role-of-the-ydib-gene-which-encodes-quinate-shikimate-dehydrogenase-in-the-production-of-quinic-dehydroshikimic-and-shikimic-acids-in-a-pts-strain-of-escherichia-coli
#19
Sofía García, Noemí Flores, Ramón De Anda, Georgina Hernández, Guillermo Gosset, Francisco Bolívar, Adelfo Escalante
The culture of engineered Escherichia coli for shikimic acid (SA) production results in the synthesis of quinic acid (QA) and dehydroshikimic acid (DHS), reducing SA yield and impairing downstream processes. The synthesis of QA by quinate/shikimate dehydrogenase (YdiB, ydiB) has been previously proposed; however, the precise role for this enzyme in the production of QA in engineered strains of E. coli for SA production remains unclear. We report the effect of the inactivation or the overexpression of ydiB in E...
2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27830360/efficient-utilization-of-eucheuma-denticulatum-hydrolysates-using-an-activated-carbon-adsorption-process-for-ethanol-production-in-a-5-l-fermentor
#20
Chae Hun Ra, Min Ji Kim, Gwi-Taek Jeong, Sung-Koo Kim
A total monosaccharide concentration of 37.8 g/L and 85.9% conversion from total fermentable monosaccharides of 44.0 g/L from 110 g dw/L Eucheuma denticulatum slurry were obtained by thermal acid hydrolysis and enzymatic saccharification. Subsequent adsorption treatment to remove 5-hydroxymethylfurfural (5-HMF) using 5% activated carbon and an adsorption time of 10 min were used to prevent a prolonged lag phase, reduced cell growth, and low ethanol production. The equilibrium adsorption capacity (q e) of HMF (58...
March 2017: Bioprocess and Biosystems Engineering
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