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Journal of Microbiology and Biotechnology

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https://www.readbyqxmd.com/read/28301920/burkholderia-tropica-as-a-potential-microalgal-growth-promoting-bacterium-in-the-biosorption-of-mercury-from-aqueous-solutions
#1
Ana Maráa ZÁrate, July Ziret Florez, Edgardo Angulo, Lourdes Varela-Prieto, Cherlys Infante, Fredy Barrios, Beatriz Barraza, Diego Gallardo, Jorge Valdés
The use of microalgal biomass is an interesting technology for the removal of heavy metals due to its high metal-binding capacity from aqueous solutions but the interactions with bacteria as a strategy for the removal of toxic metals have been poorly studied. The goal of the current research is to investigate the potential of Burkholderia tropica co-immobilized with Chlorella sp. in polyurethane discs for the biosorption of Hg(II) from aqueous solutions and to evaluate the influence of different Hg(II) concentrations (0...
March 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28301919/clostridium-difficile-toxin-a-induces-reactive-oxygen-species-production-and-p38mapk-activation-to-exert-cellular-toxicity-in-neuronal-cells
#2
Peng Zhang, Ji Hong, I Na Yoon, Jin Ku Kang, Jae Sam Hwang, Ho Kim
Clostridium difficile releases two exotoxins, toxin A and toxin B, which disrupt the epithelial cell barrier in the gut to increase mucosal permeability and trigger inflammation with severe diarrhea. Many studies have suggested that enteric nerves are also directly involved in the progression of this toxin-mediated inflammation and diarrhea. C. difficile toxin A is known to enhance neurotransmitter secretion, increase gut motility, and suppress sympathetic neurotransmission in the guinea pig colitis model. Although previous studies have examined the pathophysiological role of enteric nerves in gut inflammation, the direct effect of toxins on neuronal cells and the molecular mechanisms underlying toxin-induced neuronal stress remained to be unveiled...
March 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28301918/pseudomonas-aeruginosa-biofilm-a-programmed-bacterial-life-for-fitness
#3
REVIEW
Keehoon Lee, Sang Sun Yoon
Biofilm is a community of microbes that typically inhabits on surfaces and is encased in an extracellular matrix. Biofilms display very dissimilar characteristics to their planktonic counterparts. Biofilms are ubiquitous in the environments and influence our life tremendously in both positive and negative ways. Pseudomonas aeruginosa is a bacterium, known to produce robust biofilms. P. aeruginosa biofilms cause severe problems in immunocompromised patients including those with cystic fibrosis or wound infection...
March 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297751/preparation-of-vsv-g-viral-envelope-glycoprotein-from-pichia-pastoris-enhances-transfection-of-dna-into-animal-cells
#4
Xin Liu, Ying Dong, Jingquan Wang, Long Li, Zhenmin Zhong, Yun-Pan Li, Shao-Jun Chen, Yu-Cai Fu, Wen-Can Xu, Chi-Ju Wei
Vesicular stomatitis virus G glycoprotein (VSV-G) has been widely used for pseudotyping retroviral, lentiviral and artificial viral vectors. The objective of this study was to establish a potential approach for large scale production of VSV-G. To this end, VSV-G was cloned with a N-terminal His-tag into Pichia pastoris expression vector pPIC3.5K. Three clones (Mut(s)) containing the VSV-G expression cassette were identified by PCR. All clones proliferated normally in expansion medium, while the proliferation was reduced significantly under induction conditions...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297750/ros-scavenging-and-anti-wrinkle-effects-of-clitocybin-a-isolated-from-the-mycelium-of-the-mushroom-clitocybe-aurantiaca
#5
Joo-Eun Lee, Ik-Soo Lee, Kwan-Chul Kim, Ick-Dong Yoo, Han-Mo Yang
Clitocybin A, an isoindolinone from Clitocybe aurantiaca, was investigated to assess its anti-wrinkle properties, through reactive oxygen species (ROS) scavenging and elastase inhibitory activities, procollagen synthesis, and matrix metalloproteinase-1 (MMP-1) expression, in human dermal fibroblast (HDF-N) cells. Clitocybin A exhibited no significant cytotoxicity up to 10 ppm in HDF-N cells, with cell viability and cell proliferation activity greater than 94.6% and 91.9%, respectively. Strong and concentration-dependent ROS radical scavenging activities of clitocybin A were observed following irradiation with UVB at 30 mJ/cm²...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297749/endophytic-diaporthe-sp-ed2-produces-a-novel-anti-candidal-ketone-derivative
#6
Woei Yenn Tong, Chean Ring Leong, Wen Nee Tan, Melati Khairuddean, Latiffah Zakaria, Darah Ibrahim
This study was aimed to ascertain the anti-candidal efficacy of a novel ketone derivative isolated from Diaporthe sp. ED2, an endophytic fungus residing in medicinal herb Orthosiphon stamieus Benth. The ethyl acetate extract of the fungal culture was separated by open column and reverse phase- high performance liquid chromatography. The eluent of the second peak at retention time 5.64 minute in the HPLC system was the only peak that exhibited anti-candidal activity on Kirby Bauer assay. The structure of the compound was also elucidated by nuclear magnetic resonance and spectroscopy techniques...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297748/bioconversion-using-lactic-acid-bacteria-ginsenosides-gaba-and-phenolic-compounds
#7
REVIEW
Na-Kyoung Lee, Hyun-Dong Paik
Lactic acid bacteria (LAB) are used as fermentation starters in vegetable and dairy products and influence the pH and flavors of foods. For many centuries, LAB have been used to manufacture fermented foods; therefore, they are generally regarded as safe. LAB produce various substances such as lactic acid, β-glucosidase, or β-galactosidase, making them useful as fermentation starters. Existing functional substances have been tried as fermentation substrates for better bioavailability or other functions. Representative materials that were bioconverted using LAB have been reported and include minor ginsenoside, γ-amino butyric acid, equol, aglycone, bioactive isoflavones, genistein, daidzein, and others...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297747/enterococcus-faecium-fc-k-derived-from-kimchi-is-a-probiotc-lactic-acid-bacteria-that-shows-anti-allergic-activity
#8
Man-Kwang Rho, Young-Eun Kim, Hyun-In Rho, Tae-Rahk Kim, Yoon-Bum Kim, Won-Kyung Sung, Taw-Woo Kim, Dae-Ok Kim, Hee Kang
A rise in the occurrence of allergic diseases is attributed to the dysregulated balance of type 1/type 2 immunity, where type 2 T helper (Th2) cells predominate over type 1 T helper (Th1) cells, leading to an abnormally increased production of IgE in response to unharmful antigens. Kimchi, a traditional Korean fermented food, is a rich source of beneficial lactic acid bacteria. In this study, we investigated the ability of Enterococcus faecium FC-K derived from kimchi to induce type I immunity in the presence of Th2 polarizing conditions in vitro and in vivo...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28297746/screening-of-anti-biofilm-compounds-from-marine-derived-fungi-and-the-effects-of-secalonic-acid-d-on-staphylococcus-aureus-biofilm
#9
Jie Wang, Xu-Hua Nong, Xiao-Yong Zhang, Xin-Ya Xu, Muhammad Amin, Shu-Hua Qi
Biofilm formation of Staphylococcus aureus is one of the mechanisms of its drug resistance. Anti-biofilm screening of 106 compounds from marine-derived fungi displayed that 12 compounds inhibited S. aureus biofilm formation by > 50% at the concentration of 100 μg/ml, and only secalonic acid D (SAD) and B inhibited by > 90% at 6.25 μg/ml without inhibiting cell growth after 24-hour incubation. Meanwhile, it was found that the double bond between C-1 and C-10 of citrinin derivatives and the C-C connection position of two chromone monomers may be important for their anti-biofilm activities...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28285498/profiling-total-viable-bacteria-in-a-hemodialysis-water-treatment-system
#10
Lihua Chen, Xuan Zhu, Menglu Zhang, Yuxin Wang, Tianyu Lv, Shenghua Zhang, Xin Yu
The culture-dependent methods such as heterotrophic plate counting (HPC) are usually applied to evaluate the bacteriological quality of the hemodialysis water. However, these methods cannot detect the uncultured or viable but non-culturable (VBNC) bacteria both of which may be quantitatively predominant throughout the hemodialysis water treatment system. Therefore, PMA-qPCR associated with HPC was used together to profile the distribution of the total viable bacteria in such a system. Moreover, high-throughput sequencing of 16s rRNA gene amplicons was utilized to analyze the microbial community structure and diversity...
March 13, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28285497/cytomegalovirus-infection-among-pregnant-women-in-beijing-seroepidemiological-survey-and-intrauterine-transmission
#11
Qing-E Jin, Jian-Rong Su, Shan-Na Wu
Primary cytomegalovirus (CMV) infection during pregnancy can cause congenital defects. Available data for CMV infection during pregnancy in north China is inadequate. The aim of this study was to evaluate the epidemiology of maternal CMV infection and explore the incidence of congenital infection. In this prospective study, serum CMV IgG and IgM antibody were measured in 2887 pregnant women using ELISA, and IgG avidity test was performed on all IgM positive subjects. The seroprevalence of anti-CMV IgG was 94...
March 13, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28285496/maldi-tof-mass-spectrometry-as-a-useful-tool-for-identification-of-enterococcus-spp-from-wild-birds-and-differentiation-of-closely-related-species
#12
Dagmara Stępień-Pyśniak, Tomasz Hauschild, Paweł Różański, Agnieszka Marek
The aim of this study was to explore the accuracy and feasibility of Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) in identifying bacteria from environmental sources, as compared to rpoA gene sequencing, and to evaluate the occurrence of bacteria of the genus Enterococcus in wild birds. In addition, a phyloproteomic analysis of certain Enterococcus species with spectral relationships was performed. The enterococci were isolated from 25 species of wild birds in central Europe (Poland)...
March 13, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274104/biochemical-analysis-of-interaction-between-kringle-domains-of-plasminogen-and-prion-proteins-with-q167r-mutation
#13
Jeongmin Lee, Byoung Woo Lee, Hae-Eun Kang, Kevine K Choe, Moosik Kwon, Chongsuk Ryou
The conformational change of cellular prion protein (PrP(C)) to the misfolded counterpart, termed PrP(Sc), is mediated by a hypothesized cellular cofactor. This cofactor is believed to directly interact with certain amino acid residues of PrP(C). When these are mutated into cationic amino acid residues, PrP(Sc) formation and prion replication halt in a dominant negative (DN) manner, presumably due to strong binding of the cofactor to mutated PrP(C), designated as DN PrP mutants. Previous studies demonstrated that plasminogen and its kringle domains bind to PrP and accelerates PrP(Sc) generation...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274103/expression-and-characterization-of-a-single-chain-variable-fragment-against-human-lox-1-in-escherichia-coli-and-brevibacillus-choshinensis
#14
Wei Hu, Jun-Yan Xiang, Ping Kong, Ling Liu, Qiuhong Xie, Hongyu Xiang
The single-chain variable fragment (scFv) against lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is a promising molecule for its potential use in the diagnosis and immunotherapy of atherosclerosis. Producing this scFv in several milligram amounts could be the starting point for further engineering and application of the scFv. In this study, the abundant expression of the anti-LOX-1 scFv was attempted using Escherichia coli (E. coli) and Brevibacillus choshinensis (B. choshinensis). The scFv had limited soluble yield in E...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274102/production-of-curcuminoids-in-engineered-escherichia-coli
#15
Eun Ji Kim, Mi Na Cha, Bog-Gyu Kim, Joong-Hoon Ahn
Curcumin, a hydrophobic polyphenol derived from the rhizome of the herb Curcuma longa, possesses diverse pharmacological properties including anti-inflammatory, antioxidant, antiproliferative and antiangiogenic activity. Two curcuminoids (dicinnamoylmethane and bisdemethoxycurcumin) were synthesized from glucose in Escherichia coli. PAL (phenylalanine ammonia lyase) or TAL (tyrosine ammonia lyase), along with Os4CL (p-coumaroyl-CoA ligase) and CUS (curcumin synthase), were introduced in to E. coli, and each strain produced dicinnamoylmethane or bisdemethoxycurcumin, respectively...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274101/enhanced-purification-of-recombinant-rat-nadph-p450-reductase-by-using-a-hexahistidine-tag
#16
Hyoung-Goo Park, Young-Ran Lim, Songhee Han, Dabin Jeong, Donghak Kim
NADPH-P450 reductase (NPR) transfers electrons from NADPH to cytochrome P450 and heme oxygenase enzymes to support their catalytic activities. This protein is localized within the endoplasmic reticulum (ER) membrane and utilizes FMN, FAD, and NADPH as cofactors. While NPR is essential toward enabling the biochemical and pharmacological analyses of P450 enzymes, its production as a recombinant purified protein requires a series of tedious efforts and a high cost due to the use of NADP⁺ in the affinity chromatography process...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274100/production-of-polyhydroxyalkanoates-from-sludge-palm-oil-using-pseudomonas-putida-s12
#17
Du-Kyeong Kang, Cho-Ryong Lee, Sun Hee Lee, Jung-Hoon Bae, Young-Kwon Park, Young Ha Rhee, Bong Hyun Sung, Jung-Hoon Sohn
Polyhydroxyalkanoates (PHAs) are biodegradable plastics produced by bacteria, but their use in diverse applications is prohibited by high production costs. To reduce these costs, the conversion of PHAs from crude sludge palm oil (SPO) as an inexpensive renewable raw material by Pseudomonas strains was tested. Pseudomonasputida S12 was found to produce the highest yield (~41%) of elastomeric medium-chain-length (MCL)-PHAs from SPO. The MCL-PHA characteristics were analyzed by gas-chromatography/mass spectrometry, gel permeation chromatography, and differential scanning calorimetry...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274099/hydroxylation-of-compactin-ml-236b-by-cyp105d7-sav_7469-from-streptomyces-avermitilis
#18
Qiuping Yao, Li Ma, Ling Liu, Haruo Ikeda, Shinya Fushinobu, Shengying Li, Lian-Hua Xu
Compactin and pravastatin are competitive cholesterol biosynthesis inhibitors of 3-hydroxy-3-methylglutaryl-CoA reductase and belong to the statin drugs; however, the former shows superior pharmacokinetic characteristics. Previously, we reported that the bacterial P450, CYP105D7, from Streptomyces avermitilis can catalyze the hydroxylation of 1-deoxypentalenic acid, diclofenac and naringenin. Here, we demonstrate that CYP105D7 could also catalyze compactin hydroxylation in vitro. In the presence of both bacterial and cyanobacterial redox partner systems with an NADPH regeneration system, the reaction produced two hydroxylated products including pravastatin (hydroxylated at the C6 position)...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274098/genomic-insights-of-weissella-jogaejeotgali-fol01t-reveals-its-food-fermentation-ability-and-human-gut-adaptive-potential-for-probiotic-applications-in-food-industries
#19
Hye-Jin Ku, You-Tae Kim, Ju-Hoon Lee
While the genus Leuconostoc has often been suggested to be a novel probiotic for food fermentation and health promotion, the strains in this genus showed low acid tolerance and low osmotic stress resistance activities. Recently, a novel species of Weissella, W. jogaejeotgali FOL01(T) (= KCCM 43128 = JCM 30580), was isolated from Korean fermented clams. Its genome was completely sequenced and analyzed, consisting of a 2.1-Mb circular chromosome and a 35.4-kb plasmid pFOL01. The genome analysis showed potential for use in food fermentation and osmotic stress resistance abilities for processing in food industries...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28260346/mass-based-metabolomic-analysis-of-lactobacillus-sakei-and-its-growth-media-at-different-growth-phases
#20
Sang Bong Lee, Young Kyoung Rhee, Eun-Ji Gu, Dong-Wook Kim, Gwang-Ju Jang, Seong-Hwa Song, Jae-In Lee, Bo-Min Kim, Hyeon-Jeong Lee, Hee-Do Hong, Chang-Won Cho, Hyun-Jin Kim
Changes in the metabolite profiles of Lactobacillus sakei and its growth media, based on different culture times (0, 6, 12 and 24 h), were investigated using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-MS (LC-MS) with partial least squares discriminant analysis (PLS-DA), in order to understand the growth characteristics of this organism. Cell and media samples of L. sakei were significantly separated on PLS-DA score plots. Cell [28] and media [7] metabolites including sugars, amino acids, and organic acids were identified as major metabolites contributing to the difference among samples...
March 6, 2017: Journal of Microbiology and Biotechnology
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