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Martinus J A Daas, Antonius H P van de Weijer, Willem M de Vos, John van der Oost, Richard van Kranenburg
BACKGROUND: Due to the finite nature of global oil resources we are now faced with the challenge of finding renewable resources to produce fuels and chemicals in the future. Lactic acid has great potential as a precursor for the production of bioplastics alternatives to conventional plastics. Efficient lactic acid fermentation from non-food lignocellulosic substrates requires pretreatment and saccharification to generate fermentable sugars. A fermentation process that requires little to no enzyme additions, i...
2016: Biotechnology for Biofuels
Mathias Klein, Martina Carrillo, Joeline Xiberras, Zia-Ul Islam, Steve Swinnen, Elke Nevoigt
One advantage of using glycerol as a carbon source for industrial bioprocesses is its higher degree of reduction compared to glucose. In order to exploit this reducing power for the production of reduced compounds thereby significantly increasing maximum theoretical yields, the electrons derived from glycerol oxidation must first be saved in the form of cytosolic NAD(P)H. However, the industrial platform organism Saccharomyces cerevisiae naturally uses a FAD-dependent pathway for glycerol catabolism transferring the electrons to the respiratory chain...
October 14, 2016: Metabolic Engineering
Farshad Darvishi, Marzieh Moradi, Catherine Madzak, Claude Jolivalt
Laccases are used in numerous applications, from green degradation of various xenobiotic compounds, waste detoxification, textile dye bleaching, and delignification of lignocellulose materials to biofuel production. In this study, the recombinant Yarrowia lipolytica YL4 strain carrying the white-rot fungus Trametes versicolor laccase IIIb gene was used for laccase production from beet molasses as an agro-industrial residue. Response surface methodology was used to statistical optimization of the production of laccase by Y...
October 15, 2016: Applied Biochemistry and Biotechnology
Baisuo Zhao, Jie Liu, Craig Frear, Mark Holtzapple, Shulin Chen
This study employed mixed-culture consolidated bioprocessing (CBP) to digest microalgal biomass in an anaerobic sequencing batch reactor (ASBR). The primary objectives are to evaluate the impact of hydraulic residence time (HRT) on the productivity of carboxylic acids and to characterize the bacterial community. HRT affects the production rate and patterns of carboxylic acids. For the 5-L laboratory-scale fermentation, a 12-day HRT was selected because it offered the highest productivity of carboxylic acids and it synthesized longer chains...
October 1, 2016: Bioresource Technology
Wen Xu, Xi Ma, Yang Wang
Squalene, a naturally occurring linear triterpene formed via MVA or MEP biosynthetic pathway, is widely distributed in microorganisms, plants and animals. At present, squalene is used extensively in the food, cosmetic and medicine industries because of its antioxidant, antistatic and anti-carcinogenic properties. Increased consumer demand has led to the development of microbial bioprocesses for the commercial production of squalene, in addition to the traditional methods of isolating squalene from the liver oils of deep-sea sharks and plant seed oils...
December 2016: World Journal of Microbiology & Biotechnology
Antonietta Stellavato, Luisana Corsuto, Antonella D'Agostino, Annalisa La Gatta, Paola Diana, Patrizia Bernini, Mario De Rosa, Chiara Schiraldi
Hyaluronic Acid (HA)-based dermal formulations have rapidly gained a large consensus in aesthetic medicine and dermatology. HA, highly expressed in the Extracellular Matrix (ECM), acts as an activator of biological cascades, stimulating cell migration and proliferation, and operating as a regulator of the skin immune surveillance, through specific interactions with its receptors. HA may be used in topical formulations, as dermal inducer, for wound healing. Moreover, intradermal HA formulations (injectable HA) provide an attractive tool to counteract skin aging (e...
2016: PloS One
Fang Yuan, De-Wen Zhang, Jing-Xin Liu, Ying-Lin Zhou, Xin-Xiang Zhang
Phytochemicals are essential secondary plant metabolites which play important roles in the areas of plant biochemistry, pharmacy and medical science because of their significant bioactivities. Conventional analysis of phytochemicals in plants needs a complex combination of different extraction and separation steps. Here a simple and universal method for profiling phytochemicals in a single plant cell was demonstrated based on high performance liquid chromatography-mass spectrometry. Single purple and colorless cell samples (about 15 μm in size) found in the outer layer of a young stem of Forsythia suspensa, just inside the cuticles were collected and transferred by glass micropipettes from cell monolayers...
September 22, 2016: Analyst
Kavita R Pandey, Chetan Joshi, Babu V Vakil
Probiotics are microorganisms which when administered in adequate amounts confer health benefits to the host. A leading pharmaceutical company producing Bacillus coagulans as a probiotic was facing the problem of recurring phage attacks. Two mutants viz. B. co PIII and B. co MIII that were isolated as phage resistant mutants after UV irradiation and MMS treatment of phage sensitive B. coagulans parental culture were characterized at functional and molecular level and were noted to have undergone interesting genetic changes...
2016: SpringerPlus
Seung-Ho Baek, Eunice Y Kwon, Seon-Young Kim, Ji-Sook Hahn
Improving lactic acid (LA) tolerance is important for cost-effective microbial production of LA under acidic fermentation conditions. Previously, we generated LA-tolerant D-LA-producing S. cerevisiae strain JHY5310 by laboratory adaptive evolution of JHY5210. In this study, we performed whole genome sequencing of JHY5310, identifying four loss-of-function mutations in GSF2, SYN8, STM1, and SIF2 genes, which are responsible for the LA tolerance of JHY5310. Among the mutations, a nonsense mutation in GSF2 was identified as the major contributor to the improved LA tolerance and LA production in JHY5310...
October 6, 2016: Scientific Reports
Michael Costanzo, Benjamin VanderSluis, Elizabeth N Koch, Anastasia Baryshnikova, Carles Pons, Guihong Tan, Wen Wang, Matej Usaj, Julia Hanchard, Susan D Lee, Vicent Pelechano, Erin B Styles, Maximilian Billmann, Jolanda van Leeuwen, Nydia van Dyk, Zhen-Yuan Lin, Elena Kuzmin, Justin Nelson, Jeff S Piotrowski, Tharan Srikumar, Sondra Bahr, Yiqun Chen, Raamesh Deshpande, Christoph F Kurat, Sheena C Li, Zhijian Li, Mojca Mattiazzi Usaj, Hiroki Okada, Natasha Pascoe, Bryan-Joseph San Luis, Sara Sharifpoor, Emira Shuteriqi, Scott W Simpkins, Jamie Snider, Harsha Garadi Suresh, Yizhao Tan, Hongwei Zhu, Noel Malod-Dognin, Vuk Janjic, Natasa Przulj, Olga G Troyanskaya, Igor Stagljar, Tian Xia, Yoshikazu Ohya, Anne-Claude Gingras, Brian Raught, Michael Boutros, Lars M Steinmetz, Claire L Moore, Adam P Rosebrock, Amy A Caudy, Chad L Myers, Brenda Andrews, Charles Boone
We generated a global genetic interaction network for Saccharomyces cerevisiae, constructing more than 23 million double mutants, identifying about 550,000 negative and about 350,000 positive genetic interactions. This comprehensive network maps genetic interactions for essential gene pairs, highlighting essential genes as densely connected hubs. Genetic interaction profiles enabled assembly of a hierarchical model of cell function, including modules corresponding to protein complexes and pathways, biological processes, and cellular compartments...
September 23, 2016: Science
Nannan Zhang, Jinbao Wang, Yang Zhang, Haijun Gao
1,2,4-Butanetriol (BT) and related derivatives have been widely used in many fields, especially in the military and in medicine. In this paper, we systematically optimized the BT biosynthetic pathway. We first investigated the activities of various NADH dependent aldehyde reductases (ALRs), which catalyze the fourth reaction in the four-step pathway for BT production from xylose in E. coli, and found that a combination of multiple endogenous enzymes catalyzed aldehyde reduction in the BT production bioprocess and that YqhD in E...
November 2016: Enzyme and Microbial Technology
Anay Kumar Maurya, Deepak Parashar, T Satyanarayana
Thermophilc mold Sporotrichum thermophile secretes an acidstable and thermostable phytase, which finds application as a food and feed additive because of its adequate thermostability, acid stability, protease insensitivity and broad substrate spectrum. Low extracellular phytase production by the mold is a major bottleneck for its application on a commercial scale. We have successfully overcome this problem by constitutive secretary expression of codon optimized rStPhy under glyceraldehyde phosphate dehydrogenase (GAP) promoter in Pichia pastoris...
September 30, 2016: International Journal of Biological Macromolecules
Marcin Zabadaj, Karolina Chreptowicz, Jolanta Mierzejewska, Patrycja Ciosek
Soft sensors are powerful tools for bioprocess monitoring due to their ability to perform on-line, non-invasive measurement and possibility of detection of multiple components in cultivation media, which in turn can provide tools for the quantification of more than one metabolite/substrate/product in real time. In this work soft sensor based on excitation-emission fluorescence is for the first time applied for the monitoring of biotransformation production of 2-Phenylethanol (2-PE) by yeast strains. Main process parameters, such as optical density, glucose and 2-PE concentrations were determined with high accuracy and precision by fluorescence fingerprinting coupled with Partial Least Squares Regression...
October 3, 2016: Biotechnology Progress
Kevin C Sales, Filipa Rosa, Bernardo R Cunha, Pedro N Sampaio, Marta B Lopes, Cecília R C Calado
Escherichia coli is one of the most used host microorganism for the production of recombinant products, such as heterologous proteins and plasmids. However genetic, physiological and environmental factors influence the plasmid replication and cloned gene expression in a highly complex way. To control and optimize the recombinant expression system performance, it is very important to understand this complexity. Therefore, the development of rapid, highly sensitive and economic analytical methodologies, which enable the simultaneous characterization of heterologous product synthesis and physiologic cell behavior under a variety of culture conditions, is highly desirable...
October 3, 2016: Biotechnology Progress
M N Cruz Bournazou, T Barz, D Nickel, D Lopez Cárdenas, F Glauche, A Knepper, P Neubauer
We present an integrated framework for the online optimal experimental re-design of parallel nonlinear dynamic processes that aims to precisely estimate the parameter set of macro kinetic growth models with minimal experimental effort. This provides a systematic solution for rapid validation of a specific model to new strains, mutants, or products. In biosciences, this is especially important as model identification is a long and laborious process which is continuing to limit the use of mathematical modeling in this field...
October 3, 2016: Biotechnology and Bioengineering
Eric Y Liu, Sukwon Jung, Hyunmin Yi
We demonstrate a robust and tunable micromolding method to fabricate chemically functional poly(acrylamide-co-acrylic acid) (p(AAm-co-AA)) hydrogel microspheres with uniform dimensions and controlled porous network structures for rapid biomacromolecular conjugation. Specifically, p(AAm-co-AA) microspheres with abundant carboxylate functional groups are fabricated via surface tension-induced droplet formation in patterned poly(dimethylsiloxane) (PDMS) molds and photo-induced radical polymerization. To demonstrate chemical functionality, we enlisted a rapid EDC/NHS (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS)) chemistry for fluorescent labeling of the microspheres with a small molecule dye fluorescein glycine amide...
October 2, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Jian Lin Chen, Terry W J Steele, David C Stuckey
Stimulation of anaerobic digestion by essential trace metals is beneficial from a practical point of view to enhance the biodegradability and degradation rate of wastes. Hence, a quick method to determine which metal species, and at what concentration, can optimize anaerobic digestion is of great interest to both researchers and operators. In this present study, we investigated the effect of nickel(II), cobalt(II), and their mixture, on the anaerobic digestion of synthetic municipal wastewater. Using a volumetric method, that is, measuring methane production over time, revealed that anaerobic digestion was stimulated by the addition of 5 mg L(-1) nickel(II), and cobalt(II), and their mixture in day(s)...
October 3, 2016: Environmental Science & Technology
W N Reichelt, F Haas, P Sagmeister, C Herwig
Microbial bioprocesses need to be designed to be transferable from lab scale to production scale as well as between setups. Although substantial effort is invested to control technological parameters, usually the only true constant parameter is the actual producer of the product: the cell. Hence, instead of solely controlling technological process parameters the focus should be increasingly laid on physiological parameters. This contribution aims at illustrating a workflow of data life cycle management with special focus on physiology...
September 30, 2016: Biotechnology Progress
Victoria Steffen, Julia Otten, Susann Engelmann, Andreas Radek, Michael Limberg, Bernd W Koenig, Stephan Noack, Wolfgang Wiechert, Martina Pohl
Background: The fast development of microbial production strains for basic and fine chemicals is increasingly carried out in small scale cultivation systems to allow for higher throughput. Such parallelized systems create a need for new rapid online detection systems to quantify the respective target compound. In this regard, biosensors, especially genetically encoded Förster resonance energy transfer (FRET)-based biosensors, offer tremendous opportunities. As a proof-of-concept, we have created a toolbox of FRET-based biosensors for the ratiometric determination of l-lysine in fermentation broth...
2016: Sensors
Elena Antonov, Steffen Wirth, Tim Gerlach, Ivan Schlembach, Miriam A Rosenbaum, Lars Regestein, Jochen Büchs
BACKGROUND: Pretreated lignocellulosic biomass is considered as a suitable feedstock for the sustainable production of chemicals. However, the recalcitrant nature of cellulose often results in very cost-intensive overall production processes. A promising concept to reduce the costs is consolidated bioprocessing, which integrates in a single step cellulase production, cellulose hydrolysis, and fermentative conversion of produced sugars into a valuable product. This approach, however, requires assessing the digestibility of the applied celluloses and, thus, the released sugar amount during the fermentation...
September 29, 2016: Microbial Cell Factories
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