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Acidic stress yeast

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https://www.readbyqxmd.com/read/29789541/identifying-and-characterizing-scrambled-synthetic-yeast-using-rescues
#1
Zhouqing Luo, Lihui Wang, Yun Wang, Weimin Zhang, Yakun Guo, Yue Shen, Linghuo Jiang, Qingyu Wu, Chong Zhang, Yizhi Cai, Junbiao Dai
SCRaMbLE is a novel system implemented in the synthetic yeast genome, enabling massive chromosome rearrangements to produce strains with a large genotypic diversity upon induction. Here we describe a reporter of SCRaMbLEd cells using efficient selection, termed ReSCuES, based on a loxP-mediated switch of two auxotrophic markers. We show that all randomly isolated clones contained rearrangements within the synthetic chromosome, demonstrating high efficiency of selection. Using ReSCuES, we illustrate the ability of SCRaMbLE to generate strains with increased tolerance to several stress factors, such as ethanol, heat and acetic acid...
May 22, 2018: Nature Communications
https://www.readbyqxmd.com/read/29785040/archetypal-transcriptional-blocks-underpin-yeast-gene-regulation-in-response-to-changes-in-growth-conditions
#2
David Talavera, Christopher J Kershaw, Joseph L Costello, Lydia M Castelli, William Rowe, Paul F G Sims, Mark P Ashe, Chris M Grant, Graham D Pavitt, Simon J Hubbard
The transcriptional responses of yeast cells to diverse stresses typically include gene activation and repression. Specific stress defense, citric acid cycle and oxidative phosphorylation genes are activated, whereas protein synthesis genes are coordinately repressed. This view was achieved from comparative transcriptomic experiments delineating sets of genes whose expression greatly changed with specific stresses. Less attention has been paid to the biological significance of 1) consistent, albeit modest, changes in RNA levels across multiple conditions, and 2) the global gene expression correlations observed when comparing numerous genome-wide studies...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29777118/pdr18-is-involved-in-yeast-response-to-acetic-acid-stress-counteracting-the-decrease-of-plasma-membrane-ergosterol-content-and-order
#3
Cláudia P Godinho, Catarina S Prata, Sandra N Pinto, Carlos Cardoso, Narcisa M Bandarra, Fábio Fernandes, Isabel Sá-Correia
Saccharomyces cerevisiae has the ability to become less sensitive to a broad range of chemically and functionally unrelated cytotoxic compounds. Among multistress resistance mechanisms is the one mediated by plasma membrane efflux pump proteins belonging to the ABC superfamily, questionably proposed to enhance the kinetics of extrusion of all these compounds. This study provides new insights into the biological role and impact in yeast response to acetic acid stress of the multistress resistance determinant Pdr18 proposed to mediate ergosterol incorporation in plasma membrane...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29770550/improved-robustness-of-an-ethanologenic-yeast-strain-through-adaptive-evolution-in-acetic-acid-is-associated-with-its-enzymatic-antioxidant-ability
#4
N Gurdo, G F Novelli Poisson, Á B Juárez, M C Ríos de Molina, M A Galvagno
AIMS: To investigate multiple tolerance of Saccharomyces cerevisiae obtained through a laboratory strategy of adaptive evolution in acetic acid, its relation with enzymatic ROS detoxification and bioethanol 2G production. METHODS AND RESULTS: After adaptive evolution in acetic acid, a clone (Y8A) was selected for its tolerance to high acetic acid concentrations (13 g l-1 ) in batch cultures. Y8A was resistant to multiple stresses: osmotic, thermic, oxidative, saline, ethanol, organic acid, phenolic compounds and slow freeze-thawing cycles...
May 16, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29769066/phenolic-profile-and-biological-properties-of-the-leaves-of-ficus-vasta-forssk-moraceae-growing-in-egypt
#5
Maria Fernanda Taviano, Khaled Rashed, Angela Filocamo, Francesco Cacciola, Paola Dugo, Luigi Mondello, Carlo Bisignano, Rosaria Acquaviva, Manuela D'Arrigo, Natalizia Miceli
BACKGROUND: Ficus vasta Forssk. (Moraceae) is traditionally used for the treatment of various ailments; nonetheless, this species has been poorly studied to date. This work aimed to characterize the phenolic profile and to evaluate the antioxidant and antimicrobial properties of a hydroalcoholic extract obtained from F. vasta leaves collected in Egypt. METHODS: The phenolic profile of the extract was characterized by HPLC-PDA/ESI-MS. The antioxidant properties were examined by different in vitro systems: DPPH test, reducing power and metal chelating activity assays...
May 16, 2018: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29733968/molecular-characterization-of-elongase-of-very-long-chain-fatty-acids-6-elovl6-genes-in-misgurnus-anguillicaudatus-and-their-potential-roles-in-adaptation-to-cold-temperature
#6
Jingwen Chen, Yun Cui, Jie Yan, Jimin Jiang, Xiaojuan Cao, Jian Gao
Elongase of very long-chain fatty acids 6 (ELOVL6) is a rate-limiting enzyme catalyzing elongation of saturated and monounsaturated long-chain fatty acid. Although functional characteristics of Elovl6 have been demonstrated in mammal, the role of elovl6 in fish remains unclear. In this study, we firstly cloned three isoforms of elovl6 (elovl6a, elovl6b and elovl6-like) from loach (Misgurnus anguillicaudatus). Molecular characterizations of the three elovl6 isoforms in loach and their expressions of early life stages and different tissues were then determined...
May 4, 2018: Gene
https://www.readbyqxmd.com/read/29705357/low-doses-of-dna-damaging-agents-extend-saccharomyces-cerevisiae-chronological-lifespan-by-promoting-entry-into-quiescence
#7
Emily M Ross, Patrick H Maxwell
A variety of mild stresses have been shown to extend lifespan in diverse species through hormesis, which is a beneficial response to a stress or toxin that would cause a negative response at a higher exposure. Whether particular stresses induce hormesis can vary with genotype for a given species, and the underlying mechanisms of lifespan extension are only partly understood in most cases. We show that low doses of the DNA damaging or replication stress agents hydroxyurea, methyl methanesulfonate, 4-nitroquinoline 1-oxide, or Zeocin (a phleomycin derivative) lengthened chronological lifespan in Saccharomyces cerevisiae if cells were exposed during growth, but not if they were exposed during stationary phase...
April 26, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29705163/free-fatty-acids-reduce-metabolic-stress-and-favor-a-stable-production-of-heterologous-proteins-in-pichia-pastoris
#8
Andrea B Zepeda, Carolina A Figueroa, Adalberto Pessoa, Jorge G Farías
The growth of yeasts in culture media can be affected by many factors. For example, methanol can be metabolized by other pathways to produce ethanol, which acts as an inhibitor of the heterologous protein production pathway; oxygen concentration can generate aerobic or anaerobic environments and affects the fermentation rate; and temperature affects the central carbon metabolism and stress response protein folding. The main goal of this study was determine the implication of free fatty acids on the production of heterologous proteins in different culture conditions in cultures of Pichia pastoris...
April 12, 2018: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29698515/identification-and-characterization-of-a-plastidial-%C3%AF-3-fatty-acid-desaturase-egfad8-from-oil-palm-elaeis-guineensis-jacq-and-its-promoter-response-to-light-and-low-temperature
#9
Lizhi Chen, Lei Wang, Herong Wang, Ruhao Sun, Lili You, Yusheng Zheng, Yijun Yuan, Dongdong Li
In higher plants, ω-3 fatty acid desaturases are the key enzymes in the biosynthesis of alpha-linolenic acid (18:3), which plays key roles in plant metabolism as a structural component of both storage and membrane lipids. Here, the first ω-3 fatty acid desaturase gene was identified and characterized from oil palm. The bioinformatic analysis indicated it encodes a temperature-sensitive chloroplast ω-3 fatty acid desaturase, designated as EgFAD8. The expression analysis revealed that EgFAD8 is highly expressed in the oil palm leaves, when compared with the expression in the mesocarp...
2018: PloS One
https://www.readbyqxmd.com/read/29696514/characterizing-functional-differences-in-sea-anemone-hsp70-isoforms-using-budding-yeast
#10
Shawn J Waller, Laura E Knighton, Lenora M Crabtree, Abigail L Perkins, Adam M Reitzel, Andrew W Truman
Marine organisms experience abiotic stressors such as fluctuations in temperature, UV radiation, salinity, and oxygen concentration. Heat shock proteins (HSPs) assist in the response of cells to these stressors by refolding and maintaining the activity of damaged proteins. The well-conserved Hsp70 chaperone family is essential for cell viability as well as the response to stress. Organisms possess a variety of Hsp70 isoforms that differ slightly in amino acid sequence, yet very little is known about their functional relevance...
April 25, 2018: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/29682607/the-role-of-hsp40-conserved-motifs-in-the-response-to-cytotoxic-stress
#11
Samantha J Sojourner, Willie M Graham, Aurellia M Whitmore, Jana S Miles, Devon Freeny, Hernan Flores-Rozas
Doxorubicin, a highly effective therapeutic agent against several types of cancer, is associated with serious side-effects, particularly cardiotoxicity. In addition, drug resistance leads to unsuccessful outcomes in many patients. There are no current biomarkers to indicate doxorubicin treatment response in patients. To understand the mechanisms of toxicity of doxorubicin, a whole-genome sensitivity screen was performed in the yeast S. cerevisiae . A deletion mutant of the yeast DNAJ (YDJ1), a J-domain heat-shock protein 40 (HSP40) was among the most sensitive strains...
2018: Journal of Nature and Science
https://www.readbyqxmd.com/read/29677681/pphb22-a-member-of-hd-zip-proteins-activates-ppdam1-to-regulate-bud-dormancy-transition-in-suli-pear-pyrus-pyrifolia-white-pear-group
#12
Qinsong Yang, Qingfeng Niu, Jianzhao Li, Xiaoyan Zheng, Yunjing Ma, Songling Bai, Yuanwen Teng
Homeodomain-leucine zipper (HD-Zip) proteins, which form one of the largest and most diverse families, regulate many biological processes in plants, including differentiation, flowering, vascular development, and stress signaling. Abscisic acid (ABA) has been proved to be one of the key regulators of bud dormancy and to influence several HD-Zip genes expression. However, the role of HD-Zip genes in regulating bud dormancy remains unclear. We identified 47 pear (P. pyrifolia White Pear Group) HD-Zip genes, which were classified into four subfamilies (HD-Zip I-IV)...
April 5, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29671793/search-for-partner-proteins-of-a-thaliana-immunophilins-involved-in-the-control-of-plant-immunity
#13
Inna A Abdeeva, Gennady V Pogorelko, Liliya G Maloshenok, Maria V Mokrykova, Oksana V Fursova, Sergey A Bruskin
The involvement of plant immunophilins in multiple essential processes such as development, various ways of adapting to biotic and abiotic stresses, and photosynthesis has already been established. Previously, research has demonstrated the involvement of three immunophilin genes ( AtCYP19-1/ROC3 , AtFKBP65/ROF2 , and AtCYP57 ) in the control of plant response to invasion by various pathogens. Current research attempts to identify host target proteins for each of the selected immunophilins. As a result, candidate interactors have been determined and confirmed using a yeast 2-hybrid (Y2H) system for protein⁻protein interaction assays...
April 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29666939/a-transcriptomic-analysis-of-saccharomyces-cerevisiae-under-the-stress-of-2-phenylethanol
#14
Danfeng Jin, Bintao Gu, Dawei Xiong, Guochang Huang, Xiaoping Huang, Lan Liu, Jun Xiao
2-Phenylethanol (2-PE) is a kind of advanced aromatic alcohol with rose fragrance, which is wildly used for the deployment of flavors and fragrances. Microbial transformation is the most feasible method for the production of natural 2-PE. But a bottleneck problem is the toxicity of 2-PE on the cells. The molecular mechanisms of the toxic effect of 2-PE to Saccharomyces cerevisiae are not well studied. In this study, we analyzed the transcriptomes of S. cerevisiae in the media with and without 2-PE, respectively, using Illumina RNA-Seq technology...
April 17, 2018: Current Microbiology
https://www.readbyqxmd.com/read/29665400/tolerant-industrial-yeast-saccharomyces-cerevisiae-posses-a-more-robust-cell-wall-integrity-signaling-pathway-against-2-furaldehyde-and-5-hydroxymethyl-2-furaldehyde
#15
Z Lewis Liu, Xu Wang, Scott A Weber
Cell wall integrity signaling pathway in Saccharomyces cerevisiae is a conserved function for detecting and responding to cell stress conditions but less understood for industrial yeast. We examined gene expression dynamics for a tolerant industrial yeast strain NRRL Y-50049 in response to challenges of furfural and HMF through comparative quantitative gene expression analysis using pathway-based qRT-PCR array assays. All tested genes from Y-50049, except for MLP2, demonstrated more resistant and significantly increased gene expression than that from a laboratory strain BY4741...
April 14, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29662449/multiple-transceptors-for-macro-and-micro-nutrients-control-diverse-cellular-properties-through-the-pka-pathway-in-yeast-a-paradigm-for-the-rapidly-expanding-world-of-eukaryotic-nutrient-transceptors-up-to-those-in-human-cells
#16
REVIEW
Fenella Steyfkens, Zhiqiang Zhang, Griet Van Zeebroeck, Johan M Thevelein
The nutrient composition of the medium has dramatic effects on many cellular properties in the yeast Saccharomyces cerevisiae . In addition to the well-known specific responses to starvation for an essential nutrient, like nitrogen or phosphate, the presence of fermentable sugar or a respirative carbon source leads to predominance of fermentation or respiration, respectively. Fermenting and respiring cells also show strong differences in other properties, like storage carbohydrate levels, general stress tolerance and cellular growth rate...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29660470/the-effects-of-starvation-and-acidification-on-lag-phase-duration-of-surviving-yeast-cells
#17
Kenichi Shibata, Kohei Obase, Kiminori Itoh, Takashi Amemiya
Starvation is one of the most common forms of stress experienced in the wild life. Such conditions associate the other forms of stress such as acid, heat, oxidation, and so on. Organisms acclimate to such stresses and acquire the stress tolerances, which often trade-off their growth rates. To investigate whether starvation and the associated stresses may cause the changes in the growth and the central carbon metabolism, we stock-cultured the yeast S. cerevisiae on YNB agar plates up to a month and subsequently cultured in YNB broth...
April 13, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29655557/an-evaluation-of-the-effectiveness-of-a-chemical-additive-based-on-sodium-benzoate-potassium-sorbate-and-sodium-nitrite-on-the-fermentation-and-aerobic-stability-of-corn-silage
#18
Limin Kung, Megan L Smith, Erica Benjamim da Silva, Michelle C Windle, Thiago C da Silva, Stephanie A Polukis
We evaluated the effectiveness of an additive comprising sodium benzoate, potassium sorbate, and sodium nitrite (SSL) as active ingredients for its ability to improve the aerobic stability of corn silages made in North America. In experiment 1, treatment with SSL (1.5 and 2.0 L/t) on whole-plant corn (WPC) was compared with treatment with an additive containing buffered propionic acid and citric acid (BPA; 2 L/t) on corn harvested at 32 and 38% DM and ensiled for 120 d. Silage treated with BPA was higher in ammonia-N and propionic acid relative to other treatments...
April 11, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29627385/regulation-of-yeast-fatty-acid-desaturase-in-response-to-iron-deficiency
#19
Antonia María Romero, Tania Jordá, Nicolas Rozès, María Teresa Martínez-Pastor, Sergi Puig
Unsaturated fatty acids (UFA) are essential components of phospholipids that greatly contribute to the biophysical properties of cellular membranes. Biosynthesis of UFAs relies on a conserved family of iron-dependent fatty acid desaturases, whose representative in the model yeast Saccharomyces cerevisiae is Ole1. OLE1 expression is tightly regulated to adapt UFA biosynthesis and lipid bilayer properties to changes in temperature, and in UFA or oxygen availability. Despite iron deficiency being the most extended nutritional disorder worldwide, very little is known about the mechanisms and the biological relevance of fatty acid desaturases regulation in response to iron starvation...
April 5, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29621553/enhanced-polymalic-acid-production-from-the-glyoxylate-shunt-pathway-under-exogenous-alcohol-stress
#20
Jing Yang, Wenwen Yang, Jun Feng, Jie Chen, Min Jiang, XiangZou
Polymalic acid (PMA) is a water-soluble biopolymer produced by the yeast-like fungus Aureobasidium pullulans. In this study, the physiological response of A. pullulans against exogenous alcohols stress was investigated. Interestingly, ethanol stress was an effective inducer of enhanced PMA yield, although cell growth was slightly inhibited. The stress-responsive gene malate synthase (mls), which is involved in the glyoxylate shunt, was identified and was found to be regulated by exogenous ethanol stress. Therefore, an engineered strain, YJ-MLS, was constructed by overexpressing the endogenous mls gene, which increased the PMA titer by 16...
April 2, 2018: Journal of Biotechnology
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