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https://www.readbyqxmd.com/read/29793202/itraq-based-quantitative-proteomic-analysis-of-the-earthworm-eisenia-fetida-response-to-escherichia-coli-o157-h7
#1
Xing Wang, Xiaoqin Li, Zhenjun Sun
Soil environment contaminated by Escherichia coli O157:H7 which come from the waste of infected animals. Earthworms can live in the pathogens-polluted soil by their innate immunity. How the proteins of earthworms E. fetida will response to E. coli O157:H7-contaminated-soil still unclear? To identify the defense proteins under E. coli O157:H7 stress, we performed a proteomic analysis of earthworm under E. coli O157:H7 exposure through an iTRAQ technology. In total, we found 283 non-redundant proteins, including fibrinolytic protease 1, lombricine kinase, lysozyme, gelsolin, coelomic cytolytic factor-1, antimicrobial peptide lumbricin-l, lysenin, and et al...
May 21, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29793200/influence-of-auxochrome-group-in-disperse-dyes-bearing-azo-groups-as-chromophore-center-in-the-biotransformation-and-molecular-docking-prediction-by-reductase-enzyme-implications-and-assessment-for-environmental-toxicity-of-xenobiotics
#2
Jefferson Honorio Franco, Bianca F da Silva, Elisangela Franciscon G Dias, Alexandre A de Castro, Teodorico C Ramalho, Maria Valnice Boldrin Zanoni
Synthetic azo dyes have increasingly become a matter of great concern as a result of the genotoxic and mutagenic potential of the products derived from azo dye biotransformation. This work evaluates the manner in which reducing enzymes produced by Escherichia coli (E. coli) act on three disperse dyes bearing azo groups, namely Disperse Red 73 (DR 73), Disperse Red 78 (DR 78), and Disperse Red 167 (DR 167). UV-Vis spectrophotometry, high-performance liquid chromatography with diode array detector (HPLC-DAD), and liquid chromatography mass spectrometry (LC-MS/MS) were applied towards the identification of the main products...
May 21, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29793033/expression-of-anabaena-sensory-rhodopsin-is-influenced-by-different-codons-of-seven-residues-at-the-n-terminal-region
#3
Otgontuya Tsogbadrakh, Ah Reum Choi, Kwang-Hwan Jung
Microbial rhodopsins are well-known seven-transmembrane proteins that have been extensively studied for their structure and function. These retinal-binding proteins can be divided into two types. Type I is microbial rhodopsin, and type II (visual pigment) is expressed mostly in mammalian eyes. The two primary functions of type I rhodopsin are ion pumping activity and sensory transduction. Anabaena sensory rhodopsin (ASR) is a microbial rhodopsin with a specific function of photosensory transduction. ASR is expressed at moderate levels in Escherichia coli, but its expression level is lower compared to the general green light absorbing proteorhodopsin (GPR)...
May 21, 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29793032/phosphorylated-and-non-phosphorylated-hck-kinase-domains-produced-by-cell-free-protein-expression
#4
Kazushige Katsura, Yuri Tomabechi, Takayoshi Matsuda, Mayumi Yonemochi, Junko Mikuni, Noboru Ohsawa, Takaho Terada, Shigeyuki Yokoyama, Mutsuko Kukimoto-Niino, Chie Takemoto, Mikako Shirouzu
Since phosphorylation is involved in various physiological events, kinases and interacting factors can be potential targets for drug discovery. For the development and improvement of inhibitors from the point of view of mechanistic enzymology, a cell-free protein synthesis system would be advantageous, since it could prepare mutant proteins easily. However, especially in the case of protein kinase, product solubility remains one of the major challenges. To overcome this problem, we prepared a chaperone-supplemented extract from Escherichia coli BL21 cells harboring a plasmid encoding a set of chaperone genes, dnaK, dnaJ, and grpE...
May 21, 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29792968/applicability-of-endochitinase-of-flavobacterium-johnsoniae-with-transglycosylation-activity-in-generating-long-chain-chitooligosaccharides
#5
Papa Rao Vaikuntapu, Mohan Krishna Mallakuntla, Subha Narayan Das, Bhoopal Bhuvanachandra, Bellamkonda Ramakrishna, Sandhya Rani Nadendla, Appa Rao Podile
Chitin and its derivatives are used for a variety of applications. Flavobacterium johnsoniae UW1 is an aerobic Gram-negative bacterium and genome analysis revealed the presence of 10 glycoside hydrolases (GHs) that may degrade or modify chitin. The gene encoding chitinase B (FjchiB), which encodes a single catalytic GH18 domain has been cloned and heterologously expressed in Escherichia coli. FjChiB was optimally active in 50 mM sodium citrate buffer (pH 6.0) at 40 °C. FjChiB was salt-tolerant and catalytically versatile, with substrate specificity towards 75% DDA (degree of de-acetylation) chitosan, followed by colloidal chitin...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792906/four-novel-antibacterial-sesquiterpene-%C3%AE-amino-acid-quaternary-ammonium-hybrids-from-the-mycelium-of-mushroom-stereum-hirsutum
#6
Yuan-Chang Duan, Jun Feng, Na Bai, Guo-Hong Li, Ke-Qin Zhang, Pei-Ji Zhao
The mushroom Stereum hirsutum is parasitized by Tremella aurantia to form a heterogeneous basidiocarp Jin'er, which has been used as food and folk medicine in Chinese society. In present work, the S. hirsutum was fermented in YMG broth, and four novel mixed terpenes, stereumamides A-D (1-4), which are sesquiterpenes combined with α-amino acids to form quaternary ammonium hybrids, were isolated from the Stereum hirsutum FP-91666 and their structures were elucidated by spectroscopic data analysis. Stereumamides A and D showed antibacterial activity against Escherichia coli, Staphylococcus aureus, and Salmonella typhimurium, with the minimum inhibitory concentration (MIC) values of 12...
May 21, 2018: Fitoterapia
https://www.readbyqxmd.com/read/29792781/is-bla-ctx-m-1-riding-the-same-plasmid-among-horses-in-sweden-and-france
#7
Agnese Lupo, Marisa Haenni, Estelle Saras, Joanna Gradin, Jean-Yves Madec, Stefan Börjesson
A predominance of the blaCTX-M-1 /IncHI1 plasmid combination in horses has been reported in Czech-Republic, Denmark, and The Netherlands. To clarify a possible specific plasmid epidemiology of blaCTX-M-1 in horses in a European perspective, a collection of 74 extended-spectrum beta-lactamase-producing Escherichia coli recovered from diseased horses in France and Sweden during the period 2009-2014 was investigated in respect of their genetic relatedness, plasmid content, and molecular features. Overall, 80% of E...
May 24, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29792415/two-photon-active-organotin-iv-complexes-for-antibacterial-function-and-superresolution-bacteria-imaging
#8
Lei Hu, Hui Wang, Tingting Xia, Bin Fang, Yu Shen, Qiong Zhang, Xiaohe Tian, Hongping Zhou, Jieying Wu, Yupeng Tian
Antibacterial agents with two-photon absorption are expected to play a significant role in biomedical science. Herein, two novel organotin complexes, HLSn1 and HLSn2, based on coumarin were designed, synthesized, and systematically investigated. It was found that these complexes possessed suitable two-photon-active cross sections in the near-infrared region. Moreover, complex HLSn1 could efficiently inhibit the growth of Gram-negative Escherichia coli and Gram-positive Bacillus subtilis, especially the latter with a minimum inhibitory concentration (MIC; 90%) of 2 ± 0...
May 24, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29792233/antibiotic-resistance-and-molecular-characterization-of-diarrheagenic-escherichia-coli-and-non-typhoidal-salmonella-strains-isolated-from-infections-in-southwest-china
#9
Shun-Xian Zhang, Yong-Ming Zhou, Li-Guang Tian, Jia-Xu Chen, Rita Tinoco-Torres, Emmanuel Serrano, Shi-Zhu Li, Shao-Hong Chen, Lin Ai, Jun-Hu Chen, Shang Xia, Yan Lu, Shan Lv, Xue-Jiao Teng, Wen Xu, Wen-Peng Gu, Si-Tang Gong, Xiao-Nong Zhou, Lan-Lan Geng, Wei Hu
BACKGROUND: Bacterial diarrhea is one of the most common causes for medical consultations, mortality and morbidity in the world. Diarrheagenic Escherichia coli (DEC) and non-typhoidal Salmonella (NTS) are major intestinal pathogens in developing countries, and the indiscriminate use of antibiotics has greatly contributed to resistant strains. Hence, the aim of the present study is to identify the antimicrobial resistance patterns and the molecular characteristics of DEC and NTS in southwest, China...
May 7, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29792229/characterization-of-medle-1-a-protein-in-early-development-of-cryptosporidium-parvum
#10
Jilan Fei, Haizhen Wu, Jiayuan Su, Chanchan Jin, Na Li, Yaqiong Guo, Yaoyu Feng, Lihua Xiao
BACKGROUND: Cryptosporidium spp. are important diarrhea-causing pathogens in humans and animals. Comparative genomic analysis indicated that Cryptosporidium-specific MEDLE family proteins may contribute to host adaptation of Cryptosporidium spp., and a recent study of one member of this family, CpMEDLE-2 encoded by cgd5_4590, has provided evidence supporting this hypothesis. In this study, another member of the protein family, CpMEDLE-1 of Cryptosporidium parvum encoded by cgd5_4580, which is distinct from CpMEDLE-2 and has no signature motif MEDLE, was cloned, expressed and characterized to understand its function...
May 23, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29791796/tracking-of-engineered-bacteria-in-vivo-using-non-standard-amino-acid-incorporation
#11
Pichet Praveschotinunt, Noemie-Manuelle Dorval Courchesne, Ilona den Hartog, Chaochen Lu, Jessica J Kim, Peter Q Nguyen, Neel S Joshi
The rapidly growing field of microbiome research presents a need for better methods of monitoring gut microbes in vivo with high spatial and temporal resolution. We report a method of tracking microbes in vivo within the gastrointestinal tract by programming them to incorporate non-standard amino acids (NSAA) and labeling them via click chemistry. Using established machinery constituting an orthogonal translation system (OTS), we engineered Escherichia coli to incorporate p-azido-L-phenylalanine (pAzF) in place of the UAG (amber) stop codon...
May 23, 2018: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29791769/bioprospecting-from-marine-coastal-sediments-of-colombian-caribbean-screening-and-study-of-antimicrobial-activity
#12
M Quintero, A Velásquez, L M Jutinico, E Jiménez-Vergara, L M Blandón, K Martinez, H S Lee, J Gómez-León
AIMS: To isolate microorganisms associated to marine - coastal sediments of colombian Caribbean and for evaluating its antimicrobial activity in order to identify the most active strains. METHODS AND RESULTS: 104 strains were isolated from sediment samples of the colombian Caribbean. First at all, an antimicrobial activity screening was made using agar well diffusion method against the pathogens: Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Candida albicans, Candida tropicalis and Pseudomonas aeruginosa...
May 23, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29791251/prevalence-of-ctx-m-type-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-b2-o25-st131-h30r-among-residents-in-nonacute-care-facilities-in-japan
#13
Kumiko Kawamura, Kengo Hayashi, Nao Matsuo, Kazuki Kitaoka, Kouji Kimura, Jun-Ichi Wachino, Takaaki Kondo, Yoshitsugu Iinuma, Nobuo Murakami, Shuhei Fujimoto, Yoshichika Arakawa
We investigated the prevalence and characteristics of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli among 258 residents of long-term care facilities (LTCFs) in Japan. Out of 258 fecal samples collected from nine LTCFs between November 2015 and March 2017, we recovered 59 ESBL-producing E. coli isolates. All isolates carried blaCTX-M genes, mainly blaCTX-M-27 (42.4%), blaCTX-M-14 (23.7%), and blaCTX-M-15 (18.6%). The isolates showed 7 serotypes (STs), including ST131 (n = 49, 83.1%) and ST38 (n = 4, 6...
May 23, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29791143/water-soluble-silver-i-complexes-featuring-the-hemilabile-3-7-dimethyl-1-3-5-triaza-7-phosphabicyclo-3-3-1-nonane-ligand-synthesis-characterization-and-antimicrobial-activity
#14
Declan Armstrong, Sarah M Kirk, Cormac Murphy, Antonella Guerriero, Maurizio Peruzzini, Luca Gonsalvi, Andrew D Phillips
This paper describes the preparation and comprehensive characterization of a series of water-soluble cationic silver(I)-centered complexes featuring the hemilabile P, N-ligand known as 3,7-dimethyl-1,3,5-triaza-7-phosphabicyclo[3.3.1]nonane (herein abbreviated as PTN(Me)) and differing types of monoanionic counterions including known biologically active sulfadiazine and triclosan. The complexes primarily differed though the number of coordinating PTN(Me) ligands. The bis-substituted Ag(I) complexes revealed P, N bidentate coordination, while the only P-monocoordination of the metal center was observed for the tris-substituted systems...
May 23, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29790689/detection-of-brucella-abortus-by-immunofluorescence-assay-using-anti-outer-membrane-protein-of-19-kda-antibody
#15
Elham Mohammadi, Mehdi Golchin
BACKGROUND: Brucellosis in humans is one of the most prevalent zoonotic diseases around the world with more than 500,000 new cases per year. It is a weakening disease that requires long-term antibiotic treatment, often resulting in permanent and disabling consequences. Outer membrane proteins (OMPs) of Brucella, which are non-lipopolysaccharide (LPS) antigens, have been used for the diagnostic kits of brucellosis and vaccine design. OBJECTIVES: The aim of this study was to identify Brucella abortus with an immunofluorescence (IF) test using an antibody against recombinant outer membrane protein (OMP) of 19 kDa of this bacterium...
May 15, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29790650/a-redox-based-superoxide-generation-system-using-quinone-quinone-reductase
#16
Shailesh Kumar Singh, Syed Masood Husain
Superoxide (O2*-) generation in biological systems is achieved through some of the most complex enzymatic systems. Of these, only the xanthine/xanthine oxidase has been used for in vitro biochemical studies. However, it suffers from limitations such as, lack of suitable heterologous expression system for xanthine oxidase and the irreversible consumption along with low solubility of xanthine under physiological conditions. Here, we report a redox-based, enzyme-catalyzed system where autoxidation of hydroquinone to quinone via semiquinone results in superoxide generation...
May 23, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29790644/crispr-cas9-assisted-multiplex-genome-editing-technique-in-escherichia-coli
#17
Xu Feng, Dongdong Zhao, Xueli Zhang, Xiang Ding, Changhao Bi
Genome editing for site-specific chromosome modification is one of the most significant techniques in biological research. While conventional techniques usually deal with one genomic locus at a time, multiple genomic targets are often required to be modified to develop microbial cell factories. Thus, it is necessary to develop techniques for simultaneous editing of multiple loci. In this work, we developed a CRISPR/Cas9 assisted multiplex genome editing (CMGE) technique in Escherichia coli. With this editing method, all functional parts were assembled into replicable plasmids, and stringent inducible expression systems were used to control Cas9 gene expression, which was to decouple transformation from editing process to increase editing efficiency...
May 23, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29790623/the-analysis-of-microbial-spectrum-and-antibiotic-resistance-of-uropathogens-isolated-from-patients-with-urinary-stones
#18
Dong Chen, Yuyan Zhang, Jian Huang, Xiongfa Liang, Tao Zeng, Chuangxin Lan, Xiaolu Duan, Zhijian Zhao, Guohua Zeng, Hans-Göran Tiselius, Xiaogang Lu, Wenqi Wu
PURPOSE: The characteristics and resistance patterns of urine bacteriology in patients with urinary tract stones have not been extensively studied. This study aims to investigate the microbial spectrum and antibiotic resistance of uropathogens isolated from urinary tract infections in patients with urinary stones and provide a basis for appropriate antimicrobial treatments. METHODS: The results of positive bladder midstream urine cultures and their antimicrobial susceptibility were retrospectively analysed from hospitalised patients with diagnosis of urinary calculi and urinary tract infections between January 2010 and December 2015...
May 23, 2018: International Journal of Clinical Practice
https://www.readbyqxmd.com/read/29790584/effects-of-psidium-guajava-leaf-extract-on-secretion-systems-of-gram-negative-enteropathogenic-bacteria
#19
Noboru Nakasone, Yasunori Ogura, Naomi Higa, Claudia Toma, Yukiko Koizumi, Giichi Takaesu, Toshihiko Suzuki, Tetsu Yamashiro
We screened a total of 672 plant-tissue extracts to search for phytochemicals that inhibit the function of the type III secretion system (T3SS) of enteropathogenic Escherichia coli (EPEC) and enterohemorrhagic E. coli (EHEC). Among candidates examined, we found that an extract from the leaves of Psidium guajava (guava) inhibited the secretion of the EspB protein from EPEC and EHEC without affecting bacterial growth. The guava extract (GE) also inhibited EPEC and EHEC from adhering to and injecting EspB protein into HEp-2 cells...
May 23, 2018: Microbiology and Immunology
https://www.readbyqxmd.com/read/29790468/-polysaccharide-of-escherichia-coli-in-the-prevention-of-recurrent-urinary-tract-infection-an-evidence-based-review
#20
REVIEW
Manuel Tinoco, Mélody Santos, Conceição Reitor, Andreia Rodrigues, João Monteiro
INTRODUCTION: Recurrent urinary tract infection is frequent and it is related to morbidity, costs and growing antibiotic resistance. OM 8930 vaccine is composed by Escherichia coli polysaccharide and it is a possible prophylactic measure, but there is doubt as to its effectiveness. MATERIAL AND METHODS: We performed a systematic review in evidence-based medicine databases with rigorous bibliography selection. RESULTS: We found an effective decrease of recurrences in test groups...
March 29, 2018: Acta Médica Portuguesa
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