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https://www.readbyqxmd.com/read/29320408/outer-membrane-vesicle-vaccines-from-biosafe-surrogates-prevent-acute-lethal-glanders-in-mice
#1
Michael H Norris, Mohammad S R Khan, Sunisa Chirakul, Herbert P Schweizer, Apichai Tuanyok
Burkholderia mallei is a host-adapted Gram-negative mammalian pathogen that causes the severe disease glanders. Glanders can manifest as a rapid acute progression or a chronic debilitating syndrome primarily affecting solipeds and humans in close association with infected animals. In USA, B. mallei is classified as one of the most important bacterial biothreat agents. Presently, there is no licensed glanders vaccine available for humans or animals. In this work, outer membrane vesicles (OMVs) were isolated from three attenuated biosafe bacterial strains, Burkholderia pseudomallei Bp82, B...
January 10, 2018: Vaccines
https://www.readbyqxmd.com/read/29317789/aspergillus-subgenus-polypaecilum-from-the-built-environment
#2
J B Tanney, C M Visagie, N Yilmaz, K A Seifert
Xerophilic fungi, especially Aspergillus species, are prevalent in the built environment. In this study, we employed a combined culture-independent (454-pyrosequencing) and culture-dependent (dilution-to-extinction) approach to investigate the mycobiota of indoor dust collected from 93 buildings in 12 countries worldwide. High and low water activity (aw) media were used to capture mesophile and xerophile biodiversity, resulting in the isolation of approximately 9 000 strains. Among these, 340 strains representing seven putative species in Aspergillus subgenus Polypaecilum were isolated, mostly from lowered aw media, and tentatively identified based on colony morphology and internal transcribed spacer rDNA region (ITS) barcodes...
September 2017: Studies in Mycology
https://www.readbyqxmd.com/read/29286449/the-madagascar-hissing-cockroach-as-an-alternative-non-mammalian-animal-model-to-investigate-virulence-pathogenesis-and-drug-efficacy
#3
Jennifer Chua, Nathan A Fisher, Shane D Falcinelli, David DeShazer, Arthur M Friedlander
Many aspects of innate immunity are conserved between mammals and insects. An insect, the Madagascar hissing cockroach from the genus Gromphadorhina, can be utilized as an alternative animal model for the study of virulence, host-pathogen interaction, innate immune response, and drug efficacy. Details for the rearing, care and breeding of the hissing cockroach are provided. We also illustrate how it can be infected with bacteria such as the intracellular pathogens Burkholderia mallei, B. pseudomallei, and B...
November 24, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29283242/correction-to-global-awakening-of-cryptic-biosynthetic-gene-clusters-in-burkholderia-thailandensis
#4
Ashish Gupta, Renesh Bedre, Sudarshan Singh Thapa, Afsana Sabrin, Guannan Wang, Maheshi Dassanayake, Anne Grove
No abstract text is available yet for this article.
December 28, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/29245462/-i-dolichocephala-i-macquart-of-thailand-diptera-empididae-clinocerinae
#5
Bradley J Sinclair, Adrian R Plant
Seven new species of Dolichocephala Macquart from Thailand are described (D. bicolor sp. nov., D. curvata sp. nov., D. immaculata sp. nov., D. incus sp. nov., D. longicerca sp. nov., D. srisukai sp. nov., D. thailandensis sp. nov.). A key to species is provided, distributions mapped and phenology and biogeography discussed.
November 30, 2017: Zootaxa
https://www.readbyqxmd.com/read/29233899/detection-of-cytosolic-shigella-flexneri-via-a-c-terminal-triple-arginine-motif-of-gbp1-inhibits-actin-based-motility
#6
Anthony S Piro, Dulcemaria Hernandez, Sarah Luoma, Eric M Feeley, Ryan Finethy, Azeb Yirga, Eva M Frickel, Cammie F Lesser, Jörn Coers
Dynamin-like guanylate binding proteins (GBPs) are gamma interferon (IFN-γ)-inducible host defense proteins that can associate with cytosol-invading bacterial pathogens. Mouse GBPs promote the lytic destruction of targeted bacteria in the host cell cytosol, but the antimicrobial function of human GBPs and the mechanism by which these proteins associate with cytosolic bacteria are poorly understood. Here, we demonstrate that human GBP1 is unique among the seven human GBP paralogs in its ability to associate with at least two cytosolic Gram-negative bacteria, Burkholderia thailandensis and Shigella flexneri Rough lipopolysaccharide (LPS) mutants of S...
December 12, 2017: MBio
https://www.readbyqxmd.com/read/29208745/the-complex-quorum-sensing-circuitry-of-burkholderia-thailandensis-is-both-hierarchically-and-homeostatically-organized
#7
Servane Le Guillouzer, Marie-Christine Groleau, Eric Déziel
The genome of the bacterium Burkholderia thailandensis encodes three complete LuxI/LuxR-type quorum sensing (QS) systems: BtaI1/BtaR1 (QS-1), BtaI2/BtaR2 (QS-2), and BtaI3/BtaR3 (QS-3). The LuxR-type transcriptional regulators BtaR1, BtaR2, and BtaR3 modulate the expression of target genes in association with various N-acyl-l-homoserine lactones (AHLs) as signaling molecules produced by the LuxI-type synthases BtaI1, BtaI2, and BtaI3. We have systematically dissected the complex QS circuitry of B. thailandensis strain E264...
December 5, 2017: MBio
https://www.readbyqxmd.com/read/29208119/comparative-analysis-of-the-burkholderia-cenocepacia-k56-2-essential-genome-reveals-cell-envelope-functions-that-are-uniquely-required-for-survival-in-species-of-the-genus-burkholderia
#8
April S Gislason, Keith Turner, Mike Domaratzki, Silvia T Cardona
Burkholderia cenocepacia K56-2 belongs to the Burkholderia cepacia complex, a group of Gram-negative opportunistic pathogens that have large and dynamic genomes. In this work, we identified the essential genome of B. cenocepacia K56-2 using high-density transposon mutagenesis and insertion site sequencing (Tn-seq circle). We constructed a library of one million transposon mutants and identified the transposon insertions at an average of one insertion per 27 bp. The probability of gene essentiality was determined by comparing of the insertion density per gene with the variance of neutral datasets generated by Monte Carlo simulations...
November 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29166641/agrowastes-as-feedstock-for-the-production-of-endo-%C3%AE-xylanase-from-cohnella-sp-strain-ar92
#9
José H Pisa, Adriana P Manfredi, Nora I Perotti, Héctor G Romero, Javier D Breccia, María Alejandra Martínez
Members of Cohnella sp. isolated from a variety of environments have been shown to be glycoside hydrolase producers. Nevertheless, most evaluations of members of this genus are limited to their taxonomic description. The strain AR92, previously identified as belonging to the genus Cohnella, formed a well-supported cluster with C. thailandensis and C. formosensis (>80% bootstrap confidence). Its growth and xylanase production were approached by using a mineral-based medium containing alkali-pretreated sugarcane bagasse as the main carbon source, which was assayed as a convenient source to produce biocatalysts potentially fitting its degradation...
November 23, 2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29136176/mutations-in-metg-methionyl-trna-synthetase-and-trmd-trna-guanine-n1-methyltransferase-conferring-meropenem-tolerance-in-burkholderia-thailandensis
#10
Hyojeong Yi, Hyeri Lee, Kwang-Hwi Cho, Heenam Stanley Kim
Objectives: Although meropenem is widely used to treat Burkholderia infections, the response of Burkholderia pathogens to this antibiotic is largely unexplored. Methods: Burkholderia thailandensis, a model for Burkholderia spp., particularly Burkholderia mallei and Burkholderia pseudomallei, was challenged with a lethal level of meropenem and survivors were isolated. The genomes of two of the isolates were analysed to identify mutated genes and these genes were then specifically examined in more isolates to profile mutation diversity...
November 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29122686/an-artificially-constructed-dimer-through-deformation-of-a-short-zinc-binding-loop
#11
Jimin Park, Mi-Sun Kim, Keehyoung Joo, Jooyoung Lee, Dong Hae Shin
We have analyzed the crystal structure of the dimeric form of d-glycero-d-manno-heptose-1,7-bisphosphate phosphatase from Burkholderia thailandensis (BtGmhB), catalyzing the removal of the phosphate at the 7 position of d-glycero-d-manno-heptose-1,7-bisphosphate. The crystal structure of BtGmhB revealed a dimeric form caused by a disruption of a short zinc-binding loop. The dimeric BtGmhB structure was induced by triggering the loss of Zn(2+)via the protonation of cysteine residues at pH 4.8 of the crystallization condition...
November 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29089426/synergy-between-active-efflux-and-outer-membrane-diffusion-defines-rules-of-antibiotic-permeation-into-gram-negative-bacteria
#12
Ganesh Krishnamoorthy, Inga V Leus, Jon W Weeks, David Wolloscheck, Valentin V Rybenkov, Helen I Zgurskaya
Gram-negative bacteria are notoriously resistant to antibiotics, but the extent of the resistance varies broadly between species. We report that in significant human pathogens Acinetobacter baumannii, Pseudomonas aeruginosa, and Burkholderia spp., the differences in antibiotic resistance are largely defined by their penetration into the cell. For all tested antibiotics, the intracellular penetration was determined by a synergistic relationship between active efflux and the permeability barrier. We found that the outer membrane (OM) and efflux pumps select compounds on the basis of distinct properties and together universally protect bacteria from structurally diverse antibiotics...
October 31, 2017: MBio
https://www.readbyqxmd.com/read/29050323/histone-deacetylase-inhibitor-thailandepsin-a-activates-notch-signaling-and-suppresses-neuroendocrine-cancer-cell-growth-in-vivo
#13
Samuel Jang, Andrew Janssen, Zviadi Aburjania, Matthew B Robers, April Harrison, Ajitha Dammalapati, Yi-Qiang Cheng, Herbert Chen, Renata Jaskula-Sztul
Novel therapies for neuroendocrine (NE) cancers are desperately needed as they frequently present as metastatic disease and cause debilitating symptoms by secreting excessive hormones. Induction of Notch isoforms has a tumor suppressive effect in NE cancer cell lines, and we have observed that histone deacetylase inhibitors (HDACi) potently activate Notch. In this study, we describe the potential for Burkholderia thailandensis-derived class I HDACi thailandepsin A (TDP-A) as a Notch activator and therapeutic agent against NE cancer...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29043376/enhanced-rhamnolipid-production-in-burkholderia-thailandensis-transposon-knockout-strains-deficient-in-polyhydroxyalkanoate-pha-synthesis
#14
Scott J Funston, Konstantina Tsaousi, Thomas J Smyth, Matthew S Twigg, Roger Marchant, Ibrahim M Banat
Microbially produced rhamnolipids have significant commercial potential; however, the main bacterial producer, Pseudomonas aeruginosa, is an opportunistic human pathogen, which limits biotechnological exploitation. The non-pathogenic species Burkholderia thailandensis produces rhamnolipids; however, yield is relatively low. The aim of this study was to determine whether rhamnolipid production could be increased in Burkholderia thailandensis through mutation of genes responsible for the synthesis of the storage material polyhydroxyalkanoate (PHA), thereby increasing cellular resources for the production of rhamnolipids...
December 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29033316/synergy-and-target-promiscuity-drive-structural-divergence-in-bacterial-alkylquinolone-biosynthesis
#15
Yihan Wu, Mohammad R Seyedsayamdost
Microbial natural products are genetically encoded by dedicated biosynthetic gene clusters (BGCs). A given BGC usually produces a family of related compounds that share a core but contain variable substituents. Though common, the reasons underlying this divergent biosynthesis are in general unknown. Herein, we have addressed this issue using the hydroxyalkylquinoline (HAQ) family of natural products synthesized by Burkholderia thailandensis. Investigations into the detailed functions of two analogs show that they act synergistically in inhibiting bacterial growth...
September 28, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/29024844/structural-characterisation-of-the-capsular-polysaccharide-expressed-by-burkholderia-thailandensis-strain-e555-wbii-pknock-kmr-and-assessment-of-the-significance-of-the-2-o-acetyl-group-in-immune-protection
#16
Marc Bayliss, Matthew I Donaldson, Sergey A Nepogodiev, Giulia Pergolizzi, Andrew E Scott, Nicholas J Harmer, Robert A Field, Joann L Prior
Burkholderia pseudomallei and its close relative B. mallei are human pathogens that are classified as Tier 1 bio-threat agents. Both organisms have previously been shown to constitutively produce a capsular polysaccharide (CPS) that is both a virulence determinant and protective antigen. Extraction and purification of CPS for use as a potential vaccine candidate requires containment level 3 laboratories which is expensive and time-consuming. B. thailandensis strain E555 is closely related to B. pseudomallei and B...
November 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28973030/cholesterol-and-host-cell-surface-proteins-contribute-to-cell-cell-fusion-induced-by-the-burkholderia-type-vi-secretion-system-5
#17
Liam Whiteley, Maria Haug, Kristina Klein, Matthias Willmann, Erwin Bohn, Salvatore Chiantia, Sandra Schwarz
Following escape into the cytoplasm of host cells, Burkholderia pseudomallei and the related species Burkholderia thailandensis employ the type VI secretion system 5 (T6SS-5) to induce plasma membrane fusion with an adjacent host cell. This process leads to the formation of multinucleated giant cells and facilitates bacterial access to an uninfected host cell in a direct manner. Despite its importance in virulence, the mechanism of the T6SS-5 and the role of host cell factors in cell-cell fusion remain elusive...
2017: PloS One
https://www.readbyqxmd.com/read/28965656/effects-of-binge-alcohol-exposure-on-burkholderia-thailandensis-alveolar-macrophage-interaction
#18
Victor Jimenez, Ryan Moreno, Emily Kaufman, Heidie Hornstra, Erik Settles, Bart J Currie, Paul Keim, Fernando P Monroy
Alcohol consumption has diverse and well-documented effects on the human immune system and its ability to defend against infective agents. One example is melioidosis, a disease caused by infection with Burkholderia pseudomallei, which is of public health importance in Southeast Asia and Northern Australia, with an expanding global distribution. While B. pseudomallei infections can occur in healthy humans, binge alcohol use is progressively being recognized as a major risk factor. Although binge alcohol consumption has been considered as a risk factor for the development of melioidosis, no experimental studies have investigated the outcomes of alcohol exposure on Burkholderia spp...
November 2017: Alcohol
https://www.readbyqxmd.com/read/28855059/molecular-signature-analyses-support-the-establishment-of-the-actinobacterial-genus-sphaerimonospora-mingma-et-al-2016
#19
Paul R Meyers
The genera Microbispora and Sphaerimonospora were examined for GyrB and RecA amino-acid signatures to determine whether molecular-signature analyses support the recent establishment of the genus Sphaerimonospora. The creation of Sphaerimonospora was based mainly upon morphological differences between Microbispora and Sphaerimonospora and the clustering of the type strains of the two genera in phylogenetic trees based on a multilocus sequence analysis. The molecular-signature analyses showed that all members of Sphaerimonospora can be distinguished from all members of Microbispora at 14 amino acid positions in the GyrB protein and at four positions in the shorter RecA protein...
August 18, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28853680/pseudonocardia-thailandensis-sp-nov-an-actinomycete-isolated-from-a-subterranean-termite-nest
#20
Kanaporn Sujarit, Nikhom Sujada, Takuji Kudo, Moriya Ohkuma, Wasu Pathom-Aree, Saisamorn Lumyong
A novel Gram-stain-positive bacterium designated CMU-NKS-70T was isolated from a subterranean termite nest and characterized using a polyphasic approach. The strain exhibited branching, pinkish-cream aerial mycelium and cream-brown substrate mycelium, and formed chains of rod-like spores. The 16S rRNA gene sequence analyses indicated that strain CMU-NKS-70T belonged to the genus Pseudonocardia, showing high similarity with Pseudonocardia oroxyli D10T (98.9 % 16S rRNA gene sequence similarity), Pseudonocardia xishanensis YIM 63638T (98...
August 2017: International Journal of Systematic and Evolutionary Microbiology
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