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https://www.readbyqxmd.com/read/28938637/the-loss-of-function-of-dna-methyltransferase-1-by-sirna-impairs-the-growth-of-non-small-cell-lung-cancer-with-alleviated-side-effects-via-reactivation-of-rassf1a-and-apc-in-vitro-and-vivo
#1
Qi Lai, Yin-Hui Xu, Qiang Chen, Liang Tang, An-Gui Li, Li-Fei Zhang, Chun-Fang Zhang, Jian-Fei Song, Zhen-Zong Du
Hypermethylation of tumor suppressor genes (TSGs) promoters by DNA methyltransferase (DNMT) can be observed in almost all cancers which represent a hallmark of carcinogenesis, including lung cancer. DNMT inhibitors (e.g.5-Aza-CR/CdR) reactivate TSGs to exert anti-cancer activity and have been applied into the clinical. However, it is cytotoxic even at low concentrations, which might be not directly related to DNA methylation. We here investigated an alternative strategy in the lung cancer therapy and aimed to estimate and compare its efficiency and side effects of knockdown of DNMT1 in vitro and in vivo...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28938099/plasmid-dna-launches-live-attenuated-japanese-encephalitis-virus-and-elicits-virus-neutralizing-antibodies-in-balb-c-mice
#2
Brian Nickols, Irina Tretyakova, Alexander Tibbens, Elena Klyushnenkova, Peter Pushko
We describe novel plasmid DNA that encodes the full-length Japanese encephalitis virus (JEV) genomic cDNA and launches live-attenuated JEV vaccine in vitro and in vivo. The synthetic cDNA based on the sequence of JEV SA14-14-2 live-attenuated virus was placed under transcriptional control of the cytomegalovirus major immediate-early promoter. The stability and yields of the plasmid in E. coli were optimized by inserting three synthetic introns that disrupted JEV cDNA in the structural and nonstructural genes...
September 19, 2017: Virology
https://www.readbyqxmd.com/read/28938097/effect-of-sos-induced-levels-of-imuabc-on-spontaneous-and-damage-induced-mutagenesis-in-caulobacter-crescentus
#3
Ingrid R Alves, Marco A Lima-Noronha, Larissa G Silva, Frank S Fernández-Silva, Aline Luiza D Freitas, Marilis V Marques, Rodrigo S Galhardo
imuABC (imuAB dnaE2) genes are responsible for SOS-mutagenesis in Caulobacter crescentus and other bacterial species devoid of umuDC. In this work, we have constructed operator-constitutive mutants of the imuABC operon. We used this genetic tool to investigate the effect of SOS-induced levels of these genes upon both spontaneous and damage-induced mutagenesis. We showed that constitutive expression of imuABC does not increase spontaneous or damage-induced mutagenesis, nor increases cellular resistance to DNA-damaging agents...
September 14, 2017: DNA Repair
https://www.readbyqxmd.com/read/28938028/association-between-implant-abutment-microgap-and-implant-circularity-to-bacterial-leakage-an-in-vitro-study-using-tapered-connection-implants
#4
Eduardo Cláudio Lopes de Chaves E Mello Dias, Marcelo Sperandio, Marcelo Henrique Napimoga
PURPOSE: The aim of this study was to evaluate the microgap between the abutment and implant as well as the circularity of implant platforms and associating conformational errors with bacterial microleakage in tapered connection implant systems. MATERIALS AND METHODS: Four brands of implants with a tapered abutment connection were tested. Bacterial leakage was assessed using 0.3 μL of Escherichia coli suspension inoculated into the abutment screw chamber of the implants, which were then torqued and incubated at 37°C for 14 days...
September 22, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28937656/characterization-of-diarrheagenic-escherichia-coli-isolated-in-organic-waste-products-cattle-fecal-matter-manure-and-slurry-from-cattle-s-markets-in-ouagadougou-burkina-faso
#5
Evariste Bako, Assèta Kagambèga, Kuan Abdoulaye Traore, Touwendsida Serge Bagre, Hadiza Bawa Ibrahim, Soutongnooma Caroline Bouda, Isidore Juste Ouindgueta Bonkoungou, Saidou Kaboré, Cheikna Zongo, Alfred Sababenejo Traore, Nicolas Barro
Cattle farming can promote diarrheal disease transmission through waste, effluents or cattle fecal matter. The study aims to characterize the diarrheagenic Escherichia coli (DEC) isolated from cattle feces, manure in the composting process and slurry, collected from four cattle markets in Ouagadougou. A total of 585 samples (340 cattle feces, 200 slurries and 45 manures in the composting process) were collected from the four cattle markets between May 2015 and May 2016. A multiplex Polymerase Chain Reaction (PCR), namely 16-plex PCR, was used to screen simultaneously the virulence genes specific for shiga toxin-producing E...
September 22, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28937591/metabolic-engineering-of-escherichia-coli-for-producing-astaxanthin-as-the-predominant-carotenoid
#6
Qian Lu, Yi-Fan Bu, Jian-Zhong Liu
Astaxanthin is a carotenoid of significant commercial value due to its superior antioxidant potential and wide applications in the aquaculture, food, cosmetic and pharmaceutical industries. A higher ratio of astaxanthin to the total carotenoids is required for efficient astaxanthin production. β-Carotene ketolase and hydroxylase play important roles in astaxanthin production. We first compared the conversion efficiency to astaxanthin in several β-carotene ketolases from Brevundimonas sp. SD212, Sphingomonas sp...
September 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28937154/structural-basis-of-interstrand-cross-link-repair-by-o-6-alkylguanine-dna-alkyltransferase
#7
Alexey Y Denisov, Francis P McManus, Derek K O'Flaherty, Anne M Noronha, Christopher J Wilds
DNA interstrand cross-links (ICL) are among the most cytotoxic lesions found in biological systems. O(6)-Alkylguanine DNA alkyltransferases (AGTs) are capable of removing alkylation damage from the O(6)-atom of 2'-deoxyguanosine and the O(4)-atom of thymidine. Human AGT (hAGT) has demonstrated the ability to repair an interstrand cross-linked duplex where two O(6)-atoms of 2'-deoxyguanosine were tethered by a butylene (XLGG4) or heptylene (XLGG7) linkage. However, the analogous ICL between the O(4)-atoms of thymidine was found to evade repair...
September 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28936975/single-molecular-biology-coming-of-age-in-dna-replication
#8
Xiao-Jing Liu, Hui-Qiang Lou
DNA replication is an essential process of the living organisms. To achieve precise and reliable replication, DNA polymerases play a central role in DNA synthesis. Previous investigations have shown that the average rates of DNA synthesis on the leading and lagging strands in a replisome must be similar to avoid the formation of significant gaps in the nascent strands. The underlying mechanism has been assumed to be coordination between leading- and lagging-strand polymerases. However, Kowalczykowski's lab members recently performed single molecule techniques in E...
September 20, 2017: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/28936681/production-of-r-mandelic-acid-using-nitrilase-from-recombinant-e-coli-cells-immobilized-with-tris-hydroxymethyl-phosphine
#9
Xin-Hong Zhang, Zhi-Qiang Liu, Ya-Ping Xue, Yuan-Shan Wang, Bo Yang, Yu-Guo Zheng
Recombinant Escherichia coli cells harboring nitrilase from Alcaligenes faecalis were immobilized using tris(hydroxymethyl)phosphine (THP) as the coupling agent. The optimal pH and temperature of the THP-immobilized cells were determined at pH 8.0 and 55 °C. The half-lives of THP-immobilized cells measured at 35, 40, and 50 °C were 1800, 965, and 163 h, respectively. The concentration of R-mandelic acid (R-MA) reached 358 mM after merely 1-h conversion by the immobilized cells with 500 mM R,S-mandelonitrile (R,S-MN), affording the highest productivity of 1307 g L(-1) day(-1) and the space-time productivity of 143...
September 22, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28935987/toward-the-identification-of-a-type-i-toxin-antitoxin-system-in-the-plasmid-dna-of-dairy-lactobacillus-rhamnosus
#10
Claudia Folli, Alessia Levante, Riccardo Percudani, Davide Amidani, Stefania Bottazzi, Alberto Ferrari, Claudio Rivetti, Erasmo Neviani, Camilla Lazzi
Plasmids carry genes that give bacteria beneficial traits and allow them to survive in competitive environments. In many cases, they also harbor toxin-antitoxin (TA) systems necessary for plasmid maintenance. TA systems are generally characterized by a stable "toxin", a protein or peptide capable of killing the cell upon plasmid loss and by an unstable "antitoxin", a protein or a non-coding RNA that inhibits toxin activity. Here we report data toward the identification of a RNA-regulated TA system in the plasmid DNA of L...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28935873/whole-genome-sequencing-molecular-typing-and-in-vivo-virulence-of-oxa-48-producing-escherichia-coli-isolates-including-st131-h30-rx-h22-and-h41-subclones
#11
María de Toro, Javier Fernández, Vanesa García, Azucena Mora, Jorge Blanco, Fernando de la Cruz, M Rosario Rodicio
Carbapenem-resistant Enterobacteriaceae, including the increasingly reported OXA-48 Escherichia coli producers, are an emerging public health threat worldwide. Due to their alarming detection in our healthcare setting and their possible presence in the community, seven OXA-48-producing, extraintestinal pathogenic E. coli were analysed by whole genome sequencing as well as conventional tools, and tested for in vivo virulence. As a result, five E. coli OXA-48-producing subclones were detected (O25:H4-ST131/PST43-fimH30-virotype E; O25:H4-ST131/PST9-fimH22-virotype D5, O16:H5-ST131/PST506-fimH41; O25:H5-ST83/PST207 and O9:H25-ST58/PST24)...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28935842/the-paralogs-to-the-c-terminal-domain-of-the-cyanobacterial-ocp-are-carotenoid-donors-to-hcps
#12
Fernando Muzzopappa, Adjélé Wilson, Vinosa Yogarajah, Sandrine Cot, François Perreau, Cédric Montigny, Céline Bourcier de Carbon, Diana Kirilovsky
The photoactive Orange Carotenoid Protein photoprotects cyanobacteria cells by quenching singlet oxygen and excess excitation energy. Its N-terminal domain (NTD) is the active part of the protein and the C-terminal domain (CTD) regulates the activity. Recently, the characteristics of a family of soluble carotenoid-binding proteins (Helical Carotenoid Proteins or HCPs), paralogs of NTD-OCP, were described. Bioinformatics studies also revealed the existence of genes coding for homologs of CTD. Here, we show that the latter genes encode carotenoid proteins (CTDHs)...
September 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28935609/novel-insights-into-the-vancomycin-resistant-enterococcus-faecalis-v583-alkylhydroperoxide-reductase-subunit-f
#13
Yew Kwang Toh, Asha Manikkoth Balakrishna, Malathy Sony Subramanian Manimekalai, Boon Bin Chionh, Ramya Ramaswamy Chettiyan Seetharaman, Frank Eisenhaber, Birgit Eisenhaber, Gerhard Grüber
The ability of the vancomycin-resistant Enterococcus faecalis (V583) to restore redox homeostasis via antioxidant defense mechanism is of importance, and knowledge into this defense is essential to understand its antibiotic-resistance and survival in hosts. The flavoprotein disulfide reductase AhpR, composed of the subunits AhpC and AhpF, represents one such vital part. Circular permutation was found to be a feature of the AhpF protein family. E. faecalis (V583) AhpF (EfAhpF) appears to be a representative of a minor subclass of this family, the typically N-terminal two-fold thioredoxin-like domain (NTD_N/C) is located at the C-terminus, whereas the pyridine nucleotide-disulfide oxidoreductase domain is encoded in the N-terminal part of its sequence...
September 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28935539/molecular-structure-of-cyclomaltodextrinase-derived-from-amylolytic-lactic-acid-bacterium-enterococcus-faecium-k-1-and-properties-of-recombinant-enzymes-expressed-in-escherichia-coli-and-lactobacillus-plantarum
#14
Kridsada Unban, Apinun Kanpiengjai, Saisamorn Lumyong, Thu-Ha Nguyen, Dietmar Haltrich, Chartchai Khanongnuch
Gene encoding cyclomaltodextrinase (Cdx) from amylolytic lactic acid bacterium Enterococcus faecium K-1 was cloned and nucleotide sequence was analyzed. The open-reading frame consisted of 1767bp encoding 588 deduced amino acids. Consequently, four typically conserved regions of the glycoside hydrolase family 13 were revealed; however, nine exceeding amino acids (DSYQMTDVP) were found at the 282-290 position in comparison to previously reported cyclomaltodextrinases. This difference is believed to have an influence on the substrate specificity of this enzyme...
September 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28934947/-1-h-nmr-spectroscopy-based-metabolomics-analysis-for-the-diagnosis-of-symptomatic-e-coli-associated-urinary-tract-infection-uti
#15
Milena Lussu, Tania Camboni, Cristina Piras, Corrado Serra, Francesco Del Carratore, Julian Griffin, Luigi Atzori, Aldo Manzin
BACKGROUND: Urinary tract infection (UTI) is one of the most common diagnoses in girls and women, and to a lesser extent in boys and men younger than 50 years. Escherichia coli, followed by Klebsiella spp. and Proteus spp., cause 75-90% of all infections. Infection of the urinary tract is identified by growth of a significant number of a single species in the urine, in the presence of symptoms. Urinary culture is an accurate diagnostic method but takes several hours or days to be carried out...
September 21, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28934938/shifting-trends-in-bacteriology-and-antimicrobial-resistance-among-gastrointestinal-fistula-patients-in-china-an-eight-year-review-in-a-tertiary-care-hospital
#16
Qinjie Liu, Jianan Ren, Xiuwen Wu, Gefei Wang, Zhiwei Wang, Jie Wu, Jinjian Huang, Tianyu Lu, Jieshou Li
BACKGROUND: The purpose of this study was to determine the shifting trends in bacteriology and antimicrobial resistance of infectious specimens isolated from gastrointestinal (GI) fistula patients over eight years in China. METHODS: We retrospectively reviewed the microbial records of intra-abdominal specimens at a teaching hospital from 2008 to 2015. Study period was divided into the first half (2008-2011) and the second half (2012-2015). All isolates underwent antibiotic susceptibility testing by the micro dilution method...
September 21, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28934611/enhanced-biodegradation-of-atrazine-by-bacteria-encapsulated-in-organically-modified-silica-gels
#17
Joey J Benson, Jonathan K Sakkos, Adi Radian, Lawrence P Wackett, Alptekin Aksan
Biodegradation by cells encapsulated in silica gel is an economical and environmentally friendly method for the removal of toxic chemicals from the environment. In this work, recombinant E. coli expressing atrazine chlorohydrolase (AtzA) were encapsulated in organically modified silica (ORMOSIL) gels composed of TEOS, silica nanoparticles (SNPs), and either phenyltriethoxysilane (PTES) or methyltriethoxysilane (MTES). ORMOSIL gels adsorbed much higher amounts of atrazine than the hydrophilic TEOS gels. The highest amount of atrazine adsorbed by ORMOSIL gels was 48...
September 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28934496/activities-of-gyrase-and-topoisomerase-iv-on-positively-supercoiled-dna
#18
Rachel E Ashley, Andrew Dittmore, Sylvia A McPherson, Charles L Turnbough, Keir C Neuman, Neil Osheroff
Although bacterial gyrase and topoisomerase IV have critical interactions with positively supercoiled DNA, little is known about the actions of these enzymes on overwound substrates. Therefore, the abilities of Bacillus anthracis and Escherichia coli gyrase and topoisomerase IV to relax and cleave positively supercoiled DNA were analyzed. Gyrase removed positive supercoils ∼10-fold more rapidly and more processively than it introduced negative supercoils into relaxed DNA. In time-resolved single-molecule measurements, gyrase relaxed overwound DNA with burst rates of ∼100 supercoils per second (average burst size was 6...
September 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28934348/antimicrobial-resistance-in-clinical-escherichia-coli-isolates-from-poultry-and-livestock-china
#19
Afrah Kamal Yassin, Jiansen Gong, Patrick Kelly, Guangwu Lu, Luca Guardabassi, Lanjing Wei, Xiangan Han, Haixiang Qiu, Stuart Price, Darong Cheng, Chengming Wang
Poultry and livestock are the most important reservoirs for pathogenic Escherichia coli and use of antimicrobials in animal farming is considered the most important factor promoting the emergence, selection and dissemination of antimicrobial-resistant microorganisms. The aim of our study was to investigate antimicrobial resistance in E. coli isolated from food animals in Jiangsu, China. The disc diffusion method was used to determine susceptibility to 18 antimicrobial agents in 862 clinical isolates collected from chickens, ducks, pigs, and cows between 2004 and 2012...
2017: PloS One
https://www.readbyqxmd.com/read/28934346/antibacterial-effects-of-carbon-dots-in-combination-with-other-antimicrobial-reagents
#20
Xiuli Dong, Mohamad Al Awak, Nicholas Tomlinson, Yongan Tang, Ya-Ping Sun, Liju Yang
This study was designed to investigate the antimicrobial effects of CDots in combination with other antimicrobial reagents, including H2O2, Na2CO3, and AcOH (acetic acid). CDots were synthesized and passivated with 2,2'-(ethylenedioxy)bis(ethylamine) (EDA). The minimal inhibitory concentration (MIC) of CDots was 64 μg/mL on both Gram negative bacteria E.coli cells and Gram positive bacteria Bacillus subtilis cells. When CDots were combined with H2O2, antibacterial synergistic effects were observed based on the fractional inhibitory concentration (FIC) index, and further confirmed by an isobologram analysis and viable cell number counting methods...
2017: PloS One
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