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https://www.readbyqxmd.com/read/28426167/characterization-the-carotenoid-productions-and-profiles-of-three-rhodosporidium-toruloides-mutants-from-agrobacterium-tumefaciens-mediated-transformation
#1
Xinping Lin, Ning Gao, Sasa Liu, Sufang Zhang, Shuang Song, Chaofan Ji, Xiuping Dong, Yichen Su, Zongbao Kent Zhao, Beiwei Zhu
The red yeast Rhodosporidium toruloides is a known lipid producer capable of accumulating large amounts of triacylglycerols and carotenoids. However, it remains challenging to study its carotenoid production profiles due to limited biochemical information and inefficient genetic tools. Here we used an Agrobacterium tumefaciens-mediated transformation (ATMT) to change its carotenoid production and profiles. We constructed R. toruloides NP11 mutant libraries with ATMT, selected 3 mutants with different colors, characterized their carotenoid products by high pressure liquid chromatography-mass spectrometry (HPLC-MS) analysis, and assured differences among those strains in terms of carotenoid production and its composition profiles...
April 20, 2017: Yeast
https://www.readbyqxmd.com/read/28426144/a-multiplex-culture-system-for-the-long-term-growth-of-fission-yeast-cells
#2
Celine Callens, Nelson C Coelho, Aaron W Miller, Maria Rosa Domino Sananes, Maitreya J Dunham, Matthieu Denoual, Damien Coudreuse
Maintenance of long-term cultures of yeast cells is central to a broad range of investigations, from metabolic studies to laboratory evolution assays. However, repeated dilutions of batch cultures lead to variations in medium composition, with implications for cell physiology. In S. cerevisiae, powerful miniaturized chemostat setups, or ministat arrays, have been shown to allow for constant dilution of multiple independent cultures. Here we set out to adapt these arrays for continuous culture of a morphologically and physiologically distinct yeast, the fission yeast Schizosaccharomyces pombe, with the goal of maintaining constant population density over time...
April 20, 2017: Yeast
https://www.readbyqxmd.com/read/28423198/an-estradiol-inducible-promoter-enables-fast-graduated-control-of-gene-expression-in-fission-yeast
#3
Makoto J Ohira, David G Hendrickson, R Scott McIsaac, Nicholas Rhind
The fission yeast Schizosaccharomyces pombe lacks a diverse toolkit of inducible promoters for experimental manipulation. Available inducible promoters suffer from slow induction kinetics, limited control of expression levels and/or a requirement for defined growth medium. In particular, no S. pombe inducible promoter systems exhibit a linear dose response, which would allow expression to be tuned to specific levels. We have adapted a fast, orthogonal promoter system with a large dynamic range and a linear dose response, based on β-estradiol-regulated function of the human estrogen receptor, for use in S...
April 19, 2017: Yeast
https://www.readbyqxmd.com/read/28387035/the-frenemies-within-viruses-retrotransposons-and-plasmids-that-naturally-infect-saccharomyces-yeasts
#4
Paul A Rowley
Viruses are a major focus of current research efforts because of their detrimental impact on humanity and their ubiquity within the environment. Bacteriophages have long been used to study host-virus interactions within microbes, but it is often forgotten that the single-celled eukaryote Saccharomyces cerevisiae and related species are infected with double-stranded RNA viruses, single stranded RNA viruses, LTR-retrotransposons and double-stranded DNA plasmids. These intracellular nucleic acid elements have some similarities to higher eukaryotic viruses, i...
April 7, 2017: Yeast
https://www.readbyqxmd.com/read/28384382/the-neutral-n-linked-glycans-of-the-ustilaginomycete-yeast-sympodiomycopsis-paphiopedili
#5
Ronilo Jose D Flores, Takao Ohashi, Hiroko Kawasaki, Kazuhito Fujiyama
Sympodiomycopsis paphiopedili is a basidiomycetous yeast under the subphylum Ustilaginomycotina and is a commensal organism originally isolated from the nectar of a plant species in Japan. In this study, the neutral N-linked glycans of S. paphiopedili were prepared and structurally analyzed using high performance liquid chromatography (HPLC) and mass spectrometry (MS). Glycosidase digestion analyses were also performed to verify certain glycan linkages. HPLC and MS analyses revealed the presence of neutral N-linked glycans ranging from Man3 GlcNAc2 -PA to Man9 GlcNAc2 -PA in length...
April 6, 2017: Yeast
https://www.readbyqxmd.com/read/28303649/transforming-sugars-into-fat-lipid-biosynthesis-using-different-sugars-in-yarrowia-lipolytica
#6
Piotr Hapeta, Magdalena Rakicka, Remi Dulermo, Heber Gamboa-Meléndez, Anne-Marie Cruz-Le Coq, Jean-Marc Nicaud, Zbigniew Lazar
In an era of ever-increasing energy demands, a promising technology is being developed: the use of oleaginous microorganisms such as Yarrowia lipolytica to convert waste materials into biofuels. Here, we constructed two Y. lipolytica strains that displayed both increased lipid accumulation and more efficient use of biomass-derived sugars, including glucose, fructose, galactose and inulin. The first strain, Y. lipolytica YLZ150, was derived from the French wild-type strain W29. It had inhibited triacylglycerol mobilization (∆tgl4) and β-oxidation (∆pox1-6), and it overexpressed GPD1, DGA2, HXK1, the native Leloir pathway, SUC2 from Saccharomyces cerevisiae and INU1 from Kluyveromyces marxianus...
March 17, 2017: Yeast
https://www.readbyqxmd.com/read/28207166/a-set-of-isomeric-episomal-plasmids-for-systematic-examination-of-mitotic-stability-in-saccharomyces-cerevisiae
#7
Ruben Hohnholz, Kim Julia Pohlmann, Tilman Achstetter
Yeast episomal shuttle vectors (YEp type) are commonly used in fundamental research and biotechnology whenever elevated product levels are desired. Their instability, however, poses an impediment not only in industrial scale fermentation. In order to analyze instability which might be linked to plasmid structure, a series of YEp type plasmids identical in size has been assembled, differing only in the overall arrangement of the fragments used. Performance of the eight plasmid isoforms was studied with respect to mitotic stability...
February 16, 2017: Yeast
https://www.readbyqxmd.com/read/28181315/emodin-a-natural-inhibitor-of-protein-kinase-ck2-suppresses-growth-hyphal-development-and-biofilm-formation-of-candida-albicans
#8
Monika Janeczko, Maciej Masłyk, Konrad Kubiński, Hieronim Golczyk
Emodin (1,3,8-trihydroxy-6-methyl-anthraquinone) is a natural secondary plant product, originally isolated from the rhizomes of Rheum palmatum. Many reports show its diuretic, vasorelaxant, anti-bacterial, anti-viral, anti-ulcerogenic, immunosuppressive, hepatoprotective, anti-inflammatory, and anti-cancer potential. Emodin is a pleiotropic molecule capable of interacting with several major molecular targets, e.g. NF-κB, AKT/mTOR, and STAT3. The compound can also act as an inhibitor of some protein kinases, with special affinity to protein kinase CK2...
February 8, 2017: Yeast
https://www.readbyqxmd.com/read/28160314/saccharomyces-cerevisiae-atf1p-is-an-alcohol-acetyltransferase-and-a-thioesterase-in-vitro
#9
Bethany Nancolas, Ian D Bull, Richard Stenner, Virginie Dufour, Paul Curnow
The alcohol-O-acyltransferases are bisubstrate enzymes that catalyse the transfer of acyl chains from an acyl-CoA donor to an acceptor alcohol. In the industrial yeast Saccharomyces cerevisiae this reaction produces acyl esters that are an important influence on the flavor of fermented beverages and foods. There is also a growing interest in using acyltransferases to produce bulk quantities of acyl esters in engineered microbial cell factories. However, the structure and function of the alcohol-O-acyltransferases remain only partly understood...
February 3, 2017: Yeast
https://www.readbyqxmd.com/read/28072905/saccharomyces-cerevisiae-shuttle-vectors
#10
REVIEW
Robert Gnügge, Fabian Rudolf
Yeast shuttle vectors are indispensable tools in yeast research. They enable cloning of defined DNA sequences in Escherichia coli and their direct transfer into Saccharomyces cerevisiae cells. There are three types of commonly used yeast shuttle vectors: centromeric plasmids, episomal plasmids and integrating plasmids. In this review, we discuss the different plasmid systems and their characteristic features. We focus on their segregational stability and copy number and indicate how to modify these properties...
January 10, 2017: Yeast
https://www.readbyqxmd.com/read/28084030/use-of-a-fluoride-channel-as-a-new-selection-marker-for-fission-yeast-plasmids-and-application-to-fast-genome-editing-with-crispr-cas9
#11
(no author information available yet)
No abstract text is available yet for this article.
January 2017: Yeast
https://www.readbyqxmd.com/read/27668839/proteomic-and-genomic-characterization-of-a-yeast-model-for-ogden-syndrome
#12
Max J Dörfel, Han Fang, Jonathan Crain, Michael Klingener, Jake Weiser, Gholson J Lyon
Naa10 is an N(α) -terminal acetyltransferase that, in a complex with its auxiliary subunit Naa15, co-translationally acetylates the α-amino group of newly synthetized proteins as they emerge from the ribosome. Roughly 40-50% of the human proteome is acetylated by Naa10, rendering this an enzyme one of the most broad substrate ranges known. Recently, we reported an X-linked disorder of infancy, Ogden syndrome, in two families harbouring a c.109 T > C (p.Ser37Pro) variant in NAA10. In the present study we performed in-depth characterization of a yeast model of Ogden syndrome...
January 2017: Yeast
https://www.readbyqxmd.com/read/27943405/n-ice-plasmids-for-generating-n-terminal-3%C3%A2-%C3%A3-%C3%A2-flag-tagged-genes-that-allow-inducible-constitutive-or-endogenous-expression-in-saccharomyces-cerevisiae
#13
Yueping Zhang, Nina D Serratore, Scott D Briggs
PCR-mediated homologous recombination is a powerful approach to introduce epitope tags into the chromosomal loci at the N-terminus or the C-terminus of targeted genes. Although strategies of C-terminal epitope tagging of target genes at their loci are simple and widely used in yeast, C-terminal epitope tagging is not practical for all proteins. For example, a C-terminal tag may affect protein function or a protein may get cleaved or processed resulting in the loss of the epitope tag. Therefore, N-terminal epitope tagging may be necessary to resolve these problems...
December 12, 2016: Yeast
https://www.readbyqxmd.com/read/27930825/modulation-of-meiotic-homologous-recombination-by-dna-helicases
#14
Alexander Lorenz
DNA helicases are ATP-driven motor proteins which translocate along DNA capable of dismantling DNA-DNA interactions and/or removing proteins bound to DNA. These biochemical capabilities make DNA helicases main regulators of crucial DNA metabolic processes, including DNA replication, DNA repair, and genetic recombination. This budding topic will focus on reviewing the function of DNA helicases important for homologous recombination during meiosis, and discuss recent advances in how these modulators of meiotic recombination are themselves regulated...
December 8, 2016: Yeast
https://www.readbyqxmd.com/read/27669110/development-of-stable-haploid-strains-and-molecular-genetic-tools-for-naumovozyma-castellii-saccharomyces-castellii
#15
Ahu Karademir Andersson, Stina Oredsson, Marita Cohn
The budding yeast Naumovozyma castellii (syn. Saccharomyces castellii) has been included in comparative genomics studies and functional analyses of centromere DNA elements, and has been shown to possess beneficial traits for telomere biology research. To provide useful tools for molecular genetic approaches, we produced stable haploid heterothallic strains from an early ancestral strain derived from the N. castellii collection strain CBS 4310. To this end, we deleted the gene encoding the Ho endonuclease, which is essential for the mating type switching...
December 2016: Yeast
https://www.readbyqxmd.com/read/27668979/erg6-gene-deletion-modifies-kluyveromyces-lactis-susceptibility-to-various-growth-inhibitors
#16
Alexandra Konecna, Nora Toth Hervay, Martin Valachovic, Yvetta Gbelska
The ERG6 gene encodes an S-adenosylmethionine dependent sterol C-24 methyltransferase in the ergosterol biosynthetic pathway. In this work we report the results of functional analysis of the Kluyveromyces lactis ERG6 gene. We cloned the KlERG6 gene, which was able to complement the erg6Δ mutation in both K. lactis and Saccharomyces cerevisiae. The lack of ergosterol in the Klerg6 deletion mutant was accompanied by increased expression of genes encoding the last steps of the ergosterol biosynthesis pathway as well as the KlPDR5 gene encoding an ABC transporter...
December 2016: Yeast
https://www.readbyqxmd.com/read/27654890/use-of-ade1-and-ade2-mutations-for-development-of-a-versatile-red-white-colour-assay-of-amyloid-induced-oxidative-stress-in-saccharomyces-cerevisiae
#17
Vidhya Bharathi, Amandeep Girdhar, Archana Prasad, Meenkshi Verma, Vibha Taneja, Basant K Patel
Mutations in adenine biosynthesis pathway genes ADE1 and ADE2 have been conventionally used to score for prion [PSI(+) ] in yeast. If ade1-14 mutant allele is present, which contains a premature stop codon, [psi(-) ] yeast appear red on YPD medium owing to accumulation of a red intermediate compound in vacuoles. In [PSI(+) ] yeast, partial inactivation of the translation termination factor, Sup35 protein, owing to its amyloid aggregation allows for read-through of the ade1-14 stop codon and the yeast appears white as the red intermediate pigment is not accumulated...
December 2016: Yeast
https://www.readbyqxmd.com/read/27886402/analysis-of-paracoccidioides-lutzii-mitochondria-a-proteomic-approach
#18
L Casaletti, P S Lima, L N Oliveira, C L Borges, S N Báo, A M Bailão, C M A Soares
The genus Paracoccidioides is composed of thermal dimorphic fungi, causative agents of paracoccidioidomycosis, one of the most frequent systemic mycoses in Latin America. Mitochondria have sophisticated machinery for ATP production, which involves metabolic pathways such as citric acid and glyoxylate cycles, electron transport chain and oxidative phosphorylation. In addition, this organelle performs a variety of functions in the cell, working as an exceptional metabolic signalling centre that contributes to cellular stress responses, as autophagy and apoptosis in eukaryotic organisms...
November 25, 2016: Yeast
https://www.readbyqxmd.com/read/27862252/specific-populations-of-the-yeast-geotrichum-candidum-revealed-by-molecular-typing
#19
Noémie Jacques, Sandrine Mallet, Fatima Laaghouiti, Colin R Tinsley, Serge Casaregola
Geotrichum candidum is a ubiquitous yeast and an essential component in the production of many soft cheeses. We developed a multilocus sequence typing (MLST) scheme with five retained loci (NUP116, URA1, URA3, SAPT4 and PLB3) which were sufficiently divergent to distinguish 40 sequence types (STs) among the 67 G. candidum strains tested. Phylogenetic analyses defined five main clades; one clade was restricted to environmental isolates, three other clades included distinct environmental isolates and dairy strains, while the fifth clade comprised 34 strains (13 STs), among which all but two were isolated from milk, cheese or the dairy environment...
November 18, 2016: Yeast
https://www.readbyqxmd.com/read/27862271/it-s-not-all-about-us-evolution-and-maintenance-of-cryptococcus-virulence-requires-selection-outside-the-human-host
#20
Aleeza C Gerstein, Kirsten Nielsen
Cryptococcus is predominantly an AIDS-related pathogen that causes significant morbidity and mortality in immunocompromised patients. Research studies have historically focused on understanding how the organism causes human disease through the use of in vivo and in vitro model systems to identify virulence factors. Cryptococcus is not an obligate pathogen, however, as human-human transmission is either absent or rare. Selection in the environment must thus be invoked to shape the evolution of this taxa, and directly influences genotypic and trait diversity...
November 11, 2016: Yeast
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