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https://www.readbyqxmd.com/read/28088729/new-insights-into-aox2-transcriptional-regulation-in-chlamydomonas-reinhardtii
#1
Mariya Ostroukhova, Zhanneta Zalutskaya, Elena Ermilova
A feature of the mitochondrial electron transport chain in plants, some protists and many fungi is the presence of two terminal oxidases, the energy-conserving cytochrome oxidase and another termed alternative oxidase (AOX). AOX branches from the main respiratory chain, directly coupling the oxidation of ubiquinol with reduction of oxygen to water. The AOX genes can be divided into two discrete subfamilies, AOX1 and AOX2. Although AOX has been proposed to play essential roles in stress tolerance of organisms, the role of subfamily AOX2 is largely unknown...
December 13, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28088418/laboratory-silo-type-and-inoculation-effects-on-nutritional-composition-fermentation-and-bacterial-and-fungal-communities-of-oat-silage
#2
J J Romero, Y Zhao, M A Balseca-Paredes, F Tiezzi, E Gutierrez-Rodriguez, M S Castillo
The objectives were to evaluate (1) the use of 2 types of experimental silos (S) to characterize whole-crop oat (Avena sativa L.) silage with or without addition of an inoculant (I), and (2) the effect of inoculation on the microbial community structure of oats ensiled using only plastic bucket silos (BKT). From each of 6 sections in a field, oats were harvested, treated (INO) or not (CON) with inoculant, packed into 19-L BKT or vacuum bags (BG), and ensiled for 217 d. The inoculant added contained Lactobacillus buchneri and Pediococcus pentosaceus (4 × 10(5) and 1 × 10(5) cfu/g of fresh oats, respectively)...
January 11, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28088403/ginkgo-fruit-extract-as-an-additive-to-modify-rumen-microbiota-and-fermentation-and-to-mitigate-methane-production
#3
S Oh, R Shintani, S Koike, Y Kobayashi
Ginkgo fruit, an unused byproduct of the ginkgo nut industry, contains antimicrobial compounds known as anacardic acids. Two major cultivars of ginkgo, Kyuju (K) and Tokuro (T), were evaluated for their potential as a feed additive for ruminants. In batch culture, we incubated a mixture of hay and concentrate in diluted rumen fluid with or without 1.6% (fruit equivalent) ginkgo fruit extract. We conducted another series of batch culture studies to determine the dose response of fermentation. We also conducted continuous culture using the rumen simulation technique (RUSITEC) with cultivar K and carried out a pure culture study to monitor the sensitivity of 17 representative rumen bacterial species to ginkgo extract and component phenolics...
January 11, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28087950/amyloid-prions-in-fungi
#4
Sven J Saupe, Daniel F Jarosz, Heather L True
Prions are infectious protein polymers that have been found to cause fatal diseases in mammals. Prions have also been identified in fungi (yeast and filamentous fungi), where they behave as cytoplasmic non-Mendelian genetic elements. Fungal prions correspond in most cases to fibrillary β-sheet-rich protein aggregates termed amyloids. Fungal prion models and, in particular, yeast prions were instrumental in the description of fundamental aspects of prion structure and propagation. These models established the "protein-only" nature of prions, the physical basis of strain variation, and the role of a variety of chaperones in prion propagation and amyloid aggregate handling...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087947/lichenized-fungi-and-the-evolution-of-symbiotic-organization
#5
Martin Grube, Mats Wedin
Lichen symbioses comprise a fascinating relationship between algae and fungi. The lichen symbiotic lifestyle evolved early in the evolution of ascomycetes and is also known from a few basidiomycetes. The ascomycete lineages have diversified in the lichenized stage to give rise to a tremendous variety of morphologies. Their thalli are often internally complex and stratified for optimized integration of algal and fungal metabolisms. Thalli are frequently colonized by specific nonlichenized fungi and occasionally also by other lichens...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087943/rna-interference-in-fungi-retention-and-loss
#6
Francisco E Nicolás, Victoriano Garre
RNA interference (RNAi) is a mechanism conserved in eukaryotes, including fungi, that represses gene expression by means of small noncoding RNAs (sRNAs) of about 20 to 30 nucleotides. Its discovery is one of the most important scientific breakthroughs of the past 20 years, and it has revolutionized our perception of the functioning of the cell. Initially described and characterized in Neurospora crassa, the RNAi is widespread in fungi, suggesting that it plays important functions in the fungal kingdom. Several RNAi-related mechanisms for maintenance of genome integrity, particularly protection against exogenous nucleic acids such as mobile elements, have been described in several fungi, suggesting that this is the main function of RNAi in the fungal kingdom...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087942/the-mutualistic-interaction-between-plants-and-arbuscular-mycorrhizal-fungi
#7
Luisa Lanfranco, Paola Bonfante, Andrea Genre
Mycorrhizal fungi belong to several taxa and develop mutualistic symbiotic associations with over 90% of all plant species, from liverworts to angiosperms. While descriptive approaches have dominated the initial studies of these fascinating symbioses, the advent of molecular biology, live cell imaging, and "omics" techniques have provided new and powerful tools to decipher the cellular and molecular mechanisms that rule mutualistic plant-fungus interactions. In this article we focus on the most common mycorrhizal association, arbuscular mycorrhiza (AM), which is formed by a group of soil fungi belonging to Glomeromycota...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087936/fungal-ligninolytic-enzymes-and-their-applications
#8
Miia R Mäkelä, Erin L Bredeweg, Jon K Magnuson, Scott E Baker, Ronald P de Vries, Kristiina Hildén
The global push toward an efficient and economical biobased economy has driven research to develop more cost-effective applications for the entirety of plant biomass, including lignocellulosic crops. As discussed elsewhere (Karlsson M, Atanasova L, Funck Jensen D, Zeilinger S, in Heitman J et al. [ed], Tuberculosis and the Tubercle Bacillus, 2nd ed, in press), significant progress has been made in the use of polysaccharide fractions from lignocellulose, cellulose, and various hemicellulose types. However, developing processes for use of the lignin fraction has been more challenging...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087932/the-complexity-of-fungal-vision
#9
Reinhard Fischer, Jesus Aguirre, Alfredo Herrera-Estrella, Luis M Corrochano
Life, as we know it, would not be possible without light. Light is not only a primary source of energy, but also an important source of information for many organisms. To sense light, only a few photoreceptor systems have developed during evolution. They are all based on an organic molecule with conjugated double bonds that allows energy transfer from visible (or UV) light to its cognate protein to translate the primary physical photoresponse to cell-biological actions. The three main classes of receptors are flavin-based blue-light, retinal-based green-light (such as rhodopsin), and linear tetrapyrrole-based red-light sensors...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087930/fungal-ecology-principles-and-mechanisms-of-colonization-and-competition-by-saprotrophic-fungi
#10
Lynne Boddy, Jennifer Hiscox
Decomposer fungi continually deplete the organic resources they inhabit, so successful colonization of new resources is a crucial part of their ecology. Colonization success can be split into (i) the ability to arrive at, gain entry into, and establish within a resource and (ii) the ability to persist within the resource until reproduction and dissemination. Fungi vary in their life history strategies, the three main drivers of which are stress (S-selected), disturbance (ruderal, or R-selected), and incidence of competitors (C-selected); however, fungi often have combinations of characteristics from different strategies...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087929/fungal-plant-pathogenesis-mediated-by-effectors
#11
Pierre J G M De Wit, Alison C Testa, Richard P Oliver
The interactions between fungi and plants encompass a spectrum of ecologies ranging from saprotrophy (growth on dead plant material) through pathogenesis (growth of the fungus accompanied by disease on the plant) to symbiosis (growth of the fungus with growth enhancement of the plant). We consider pathogenesis in this article and the key roles played by a range of pathogen-encoded molecules that have collectively become known as effectors.
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087801/occurrence-of-similar-mycoviruses-in-pathogenic-saprotrophic-and-mycorrhizal-fungi-inhabiting-the-same-forest-stand
#12
Eeva J Vainio, Taina Pennanen, Tiina Rajala, Jarkko Hantula
Fungal viruses (mycoviruses) are considered to be highly host specific, but phylogenetic analysis supports the occasional occurrence of horizontal transmission between species. We used an extensive sampling strategy to investigate whether similar viruses occur in more than one fungal species of the same forest habitat. Mycelial samples were collected from in-growth mesh bags (N = 259), fruiting bodies (N = 173) and cultured isolates (N = 68) at a forest site where the spatial distribution of viral infections in clonal individuals of the wood decay fungus H...
January 12, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28087662/terpenoids-in-plant-and-arbuscular-mycorrhiza-reinforced-defence-against-herbivorous-insects
#13
REVIEW
Esha Sharma, Garima Anand, Rupam Kapoor
BACKGROUND: Plants, though sessile, employ various strategies to defend themselves against herbivorous insects and convey signals of an impending herbivore attack to other plant(s). Strategies include the production of volatiles that include terpenoids and the formation of symbiotic associations with fungi, such as arbuscular mycorrhiza (AM). This constitutes a two-pronged above-ground/below-ground attack-defence strategy against insect herbivores. SCOPE: Terpenoids represent an important constituent of herbivore-induced plant volatiles that deter herbivores and/or attract their predators...
January 12, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28087464/mitochondrial-reactive-oxygen-species-regulate-fungal-protease-induced-inflammatory-responses
#14
Yun Hee Kim, Seung-Hyo Lee
Epidemiological studies have shown that fungal infections are a main cause of respiratory tract diseases, such as asthma, bronchopneumonia, intoxication, and invasive fungal disease. Fungi such as Aspergillus and Candida species have become increasingly important pathogens as the global climate changes. Accordingly, in this study, we evaluated the toxicological potential of Aspergillus protease in the lower respiratory tract. Exposure of Aspergillus protease to A549 cells induced upregulation of tumor necrosis factor (TNF)-α, monocyte chemoattractant protein (MCP)-1, and intercellular adhesion molecule (ICAM)-1 mRNAs and increased production of interleukin (IL)-8 and MCP-1 protein through enhanced mitochondrial reactive oxygen species (ROS) generation and activation of mitogen-activated protein kinase (MAPK) and activator protein (AP)-1...
January 10, 2017: Toxicology
https://www.readbyqxmd.com/read/28087206/spatial-relationships-between-entomopathogenic-nematodes-and-nematophagous-fungi-in-florida-citrus-orchards
#15
Ekta Pathak, Raquel Campos-Herrera, Fahiem E El-Borai, Larry W Duncan
Relationships between entomopathogenic nematodes (EPNs), nematophagous fungi (NF) and soil physical and chemical properties were studied in a survey of 53 citrus orchards in central ridge and flatwoods ecoregions of Florida. Seven species of NF associated with nematodes were quantified directly using a real time qPCR assay. All nematophagous fungi studied exceptArthrobotrys musiformis andHirsutella rhossiliensiswere frequently detected (24-56%) in both regions.Paecilomyces lilacinusandGamsylella gephyropagumwere encountered more frequently in the flatwoods (P = 0...
January 10, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28081580/biosynthetic-studies-on-acetosellin-and-structure-elucidation-of-a-new-acetosellin-derivative
#16
Peter Hufendiek, Simon Stephan Martin Stölben, Stefan Kehraus, Nicole Merten, Henrik Harms, Max Crüsemann, Idris Arslan, Michael Gütschow, Tanja Schneider, Gabriele Maria König
Natural products from fungi, especially Ascomycota, play a major role in therapy and drug discovery. Fungal strains originating from marine habitats offer a new avenue for finding unusual molecular skeletons. Here, the marine-derived fungus Epicoccum nigrum (strain 749) was found to produce the azaphilonoid compounds acetosellin and 5',6'-dihydroxyacetosellin. The latter is a new natural product. The biosynthesis of these polyketide-type compounds is intriguing, since two polyketide chains are assembled to the final product...
January 12, 2017: Planta Medica
https://www.readbyqxmd.com/read/28081358/microbial-diversity-during-fermentation-of-sweet-paste-a-chinese-traditional-seasoning-using-pcr-denaturing-gradient-gel-electrophoresis
#17
Ping Mao, Yuanliang Hu, Tingting Liao, Zhaoting Wang, Shumiao Zhao, Yunxiang Liang, Yongmei Hu
The aim of this study was to elucidate the changes in the microbial community and biochemical properties of a traditional sweet paste during fermentation. PCR-denaturing gradient gel electrophoresis (DGGE) analysis showed that Aspergillus oryzae was the predominant species in the koji and the majority of the fungi isolated belonged to 2 Zygosaccharomyces species in the mash. The bacterial DGGE profiles revealed the presence of Bacillus subtilis during fermentation, and Lactobacillus acidipiscis, Lactobacillus pubuzihii, Lactobacillus sp, Staphylococcus kloosi and several uncultured bacteria were also detected in the mash after 14 days of main fermentation...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28081356/canna-edulis-leaf-extract-mediated-preparation-of-stabilized-silver-nanoparticles-characterization-antimicrobial-activity-and-toxicity-studies
#18
S V Otari, S H Pawar, Sanjay K S Patel, Raushan K Singh, Sang-Yong Kim, Jai Hyo Lee, Liaoyuan Zhang, Jung-Kul Lee
A novel approach to synthesize silver nanoparticles (AgNPs) using leaf extract of Canna edulis Ker-Gawl. (CELE) under ambient conditions is reported here. The as-prepared AgNPs were analyzed by UV-visible spectroscopy, transmission emission microscopy, X-ray diffraction, Fourier transform-infra red spectroscopy, energy-dispersive analysis of X-ray spectroscopy, zeta potential, and dynamic light scattering. The AgNPs showed excellent antimicrobial activity against various pathogens, including bacteria and various fungi...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28080997/tackling-emerging-fungal-threats-to-animal-health-food-security-and-ecosystem-resilience
#19
Matthew C Fisher, Neil A R Gow, Sarah J Gurr
Emerging infections caused by fungi have become a widely recognized global phenomenon. Their notoriety stems from their causing plagues and famines, driving species extinctions, and the difficulty in treating human mycoses alongside the increase of their resistance to antifungal drugs. This special issue comprises a collection of articles resulting from a Royal Society discussion meeting examining why pathogenic fungi are causing more disease now than they did in the past, and how we can tackle this rapidly emerging threat to the health of plants and animals worldwide...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28080996/mitigating-amphibian-chytridiomycoses-in-nature
#20
REVIEW
Trenton W J Garner, Benedikt R Schmidt, An Martel, Frank Pasmans, Erin Muths, Andrew A Cunningham, Che Weldon, Matthew C Fisher, Jaime Bosch
Amphibians across the planet face the threat of population decline and extirpation caused by the disease chytridiomycosis. Despite consensus that the fungal pathogens responsible for the disease are conservation issues, strategies to mitigate their impacts in the natural world are, at best, nascent. Reducing risk associated with the movement of amphibians, non-amphibian vectors and other sources of infection remains the first line of defence and a primary objective when mitigating the threat of disease in wildlife...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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