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e. coli

Jing Huang, Guohe Huang, Chunjiang An, Yuan He, Yao Yao, Peng Zhang, Jian Shen
Global water safety is facing great challenges due to increased population and demand. There is an urgent need to develop suitable water treatment strategy for small rural and remote communities in low-income developing countries. In order to find a low-cost solution, the reduction of E. coli using ceramic water disk coated with nano ZnO was investigated in this study. The performance of modified ceramic disk filters was influenced by several factors in the filter production process. Based on the factorial analysis, the pore size of the disk filters was the most significant factor for influencing E...
March 12, 2018: Environmental Pollution
Suhyung Cho, Donghui Choe, Eunju Lee, Sun Chang Kim, Bernhard Ø Palsson, Byung-Kwan Cho
Along with functional advances in the use of CRISPR/Cas9 for genome editing, endonuclease-deficient Cas9 (dCas9) has provided a versatile molecular tool for exploring gene functions. In principle, differences in cell phenotypes that result from the RNA-guided modulation of transcription levels by dCas9 are critical for inferring with gene function; however, the effect of intracellular dCas9 expression on bacterial morphology has not been systematically elucidated. Here, we observed unexpected morphological changes in Escherichia coli mediated by dCas9, which were then characterized using RNA sequencing (RNA-Seq) and chromatin immunoprecipitation sequencing (ChIP-Seq)...
March 15, 2018: ACS Synthetic Biology
Olivier Poupel, Caroline Proux, Bernd Jagla, Tarek Msadek, Sarah Dubrac
The success of Staphylococcus aureus, as both a human and animal pathogen, stems from its ability to rapidly adapt to a wide spectrum of environmental conditions. Two-component systems (TCSs) play a crucial role in this process. Here, we describe a novel staphylococcal virulence factor, SpdC, an Abi-domain protein, involved in signal sensing and/or transduction. We have uncovered a functional link between the WalKR essential TCS and the SpdC Abi membrane protein. Expression of spdC is positively regulated by the WalKR system and, in turn, SpdC negatively controls WalKR regulon genes, effectively constituting a negative feedback loop...
March 2018: PLoS Pathogens
Ya-Li Zhang, Xiao-Bin Fu, Hong-Chun Cui, Lei Zhao, Ji-Zhong Yu, Hong-Liang Li
As one of the main lepidopteran pests in Chinese tea plantations, Ectropis obliqua Warren (tea geometrids) can severely decrease yields of tea products. The olfactory system of the adult tea geometrid plays a significant role in seeking behaviors, influencing their search for food, mating partners, and even spawning grounds. In this study, a general odorant-binding protein (OBP) gene, EoblGOBP2 , was identified in the antennae of E. obliqua using reverse transcription quantification PCR (RT-qPCR). Results showed that EoblGOBP2 was more highly expressed in the antennae of males than in females relative to other tissues...
March 15, 2018: International Journal of Molecular Sciences
Quintin Borgersen, David T Bolick, Glynis L Kolling, Matthew Aijuka, Fernando Ruiz-Perez, Richard L Guerrant, James P Nataro, Araceli E Santiago
Enteroaggregative E. coli (EAEC) is associated with food-borne outbreaks of diarrhea and growth faltering among children in developing countries. A Shiga toxin-producing EAEC strain of serotype O104:H4 strain caused one of the largest outbreaks of a food-borne infection in Europe in 2011. The outbreak was traced to contaminated fenugreek sprouts, yet the mechanisms whereby such persistent contamination of sprouts could have occurred are not clear. We found that under ambient conditions of temperature and in minimal media, pathogenic Shiga toxin-producing EAEC O104:H4 227-11 and non-Shiga toxin-producing 042 strains both produce high levels of exopolysaccharide structures (EPS) that are released to the external milieu...
March 15, 2018: Gut Microbes
Geng Li, Chenhui He, Peixuan Bu, Huimin Bi, Sichen Pan, Ronghua Sun, Xin Sheng Zhao
Skp and SurA are both periplasmic chaperones involved in the biogenesis of E. coli β-barrel outer membrane proteins (OMPs). It is commonly assumed that SurA plays a major role, whereas Skp is a minor factor. However, there is no molecular evidence for whether their roles are redundant or not. Here, by using different dilution methods, we obtained monodisperse and aggregated forms of OmpC and studied their interactions with Skp and SurA by single-molecule fluorescence resonance energy transfer (smFRET) and fluorescence correlation spectroscopy (FCS)...
March 15, 2018: ACS Chemical Biology
Neerupma Bhardwaj, Kirtimaan Syal, Dipankar Chatterji
ppGpp, an alarmone for stringent response, plays an important role in the reprogramming of the transcription complex at the time of stress. In Escherichia coli, ppGpp mediates its action by binding to at least two different sites on RNA polymerase (RNAP). One of the sites to which ppGpp binds to RNAP is at the β'-ω interface; however, the underlying molecular mechanism and the physiological relevance of ppGpp binding to this site remain unclear. In this study, we have performed UV cross-linking experiments using32 P azido-labeled ppGpp to probe its association with RNAP in the absence and presence of ω, and observed weaker binding of ppGpp to the RNAP without ω...
March 15, 2018: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
Ingo de Vries, Sarah Schreiber, Daniel Boßmann, Zawadi Hellmann, Jens Kopatz, Harald Neumann, Sascha Beutel
Polysialic acid (polySia) is a promising molecule for various medical applications (e.g., treatment of inflammatory neurodegenerative diseases). In this study a complete production process for human-identical α-(2,8)-linked polySia was developed using a disposable bioreactor for cultivation of Escherichia coli K1 and single-use membrane adsorbers for downstream processing (DSP). The cultivation process was optimized to minimize complex media components and a maturation process after cultivation was established...
March 2018: Biotechnology Reports
Christian E Ogaugwu, Qiuying Cheng, Annabeth Fieck, Ivy Hurwitz, Ravi Durvasula
Constitutively active promoter elements for heterologous protein production in Lactococcus lactis are scarce. Here, the promoter of the PTS-IIC gene cluster from L. lactis NZ3900 is described. This promoter was cloned upstream of an enhanced green fluorescent protein, GFPmut3a, and transformed into L. lactis. Transformants produced up to 13.5 μg of GFPmut3a per milliliter of log phase cells. Addition of cellobiose further increased the production of GFPmut3a by up to two-fold when compared to glucose. Analysis of mutations at two specific positions in the PTS-IIC promoter showed that a 'T' to 'G' mutation within the -35 element resulted in constitutive expression in glucose, while a 'C' at nucleotide 7 in the putative cre site enhanced promoter activity in cellobiose...
March 2018: Biotechnology Reports
Azeem Ullah, Yuxiang Zhang, Zafar Iqbal, Yaxin Zhang, Dong Wang, Jincan Chen, Ping Hu, Zhuo Chen, Mingdong Huang
Photodynamic antimicrobial chemotherapy (PACT) is considered a promising alternative to conventional antibiotic approach. We have previously developed a novel PS containing five lysine amino acids, pentalysine-β-carbonylphthalocyanine Zinc (ZnPc(Lys)5 ), which in the presence of light, is highly toxic against a range of bacterial strains, including hospital isolated, drug resistant Acinetobacter baumannii. Here, we study the effect of light fluence of the two light sources on the PACT potency of ZnPc(Lys)5 ...
March 1, 2018: Biomedical Optics Express
Nicholas Agyepong, Usha Govinden, Alex Owusu-Ofori, Sabiha Yusuf Essack
Background: Multidrug-resistant Gram-negative bacteria have emerged as major clinical and therapeutic dilemma in hospitals in Ghana.To describe the prevalence and profile of infections attributable to multidrug-resistant Gram-negative bacteria among patients at the Komfo Anokye Teaching Hospital in the Ashanti region of Ghana. Methods: Bacterial cultures were randomly selected from the microbiology laboratory from February to August, 2015. Bacterial identification and minimum inhibitory concentrations were conducted using standard microbiological techniques and the Vitek-2 automated system...
2018: Antimicrobial Resistance and Infection Control
G Ström, S Boqvist, A Albihn, L-L Fernström, A Andersson Djurfeldt, S Sokerya, T Sothyra, U Magnusson
Background: Administration of antimicrobials to food-producing animals is regarded as a major contributor to the overall emergence of resistance in bacteria worldwide. However, few data are available on global antimicrobial use and resistance (AMR) in livestock, especially from low- and middle-income countries. Methods: We conducted a structured survey of 91 small-scale pig farms in the urban and peri-urban areas of Phnom Penh, Cambodia, to assess the farmers' knowledge, attitudes and practices related to antimicrobial use in their pig production...
2018: Antimicrobial Resistance and Infection Control
Joshua N Edokpayi, John O Odiyo, Elizabeth O Popoola, Titus A M Msagati
Background: Access to clean and safe drinking water is still a problem in developing countries and more pronounced in rural areas. Due to erratic supply of potable, rural dwellers often seek for an alternative source of water to meet their basic water needs. The objective of this study is to monitor the microbiological and physicochemical water quality parameters of Nzhelele River which is a major alternative source of drinking water to villages along its course in Limpopo province of South Africa...
2018: Open Microbiology Journal
Ishan Ghai, Harsha Bajaj, Jayesh Arun Bafna, Hussein Ali El Damrany Hussein, Mathias Winterhalter, Richard Wagner
The outer cell wall of the Gram-negative bacteria is a crucial barrier for antibiotics to reach their target. Here we show that the chemical stability of the widely used antibiotic ampicillin is a major factor in the permeation across OmpF to reach the target in the periplasm. Using planar lipid bilayer we investigated the interactions and permeation of OmpF with ampicillin, its basic pH induced primary degradation product (penicilloic acid), and the chemically more stable benzylpenicillin. We found that the solute induced ion current fluctuation is 10 times higher with penicilloic-acid than with ampicillin...
March 14, 2018: Journal of Biological Chemistry
Valeryi K Lishko, Valentin P Yakubenko, Tatiana P Ugarova, Nataly P Podolnikova
Platelet Factor 4 (PF4) is one of the most abundant cationic proteins secreted from α-granules of activated platelets. Based on its structure, PF4 was assigned to the CXC family of chemokines and has been shown to have numerous effects on myeloid leukocytes. However, the receptor for PF4 remains unknown. Here, we demonstrate that PF4 induces leukocyte responses through the integrin Mac-1 (αM β2 , CD11b/CD18). Human neutrophils, monocytes, U937 monocytic and HEK293 cells expressing Mac-1 strongly adhered to immobilized PF4 in a concentration-dependent manner...
March 14, 2018: Journal of Biological Chemistry
Shun Tamaki, Mitsuhiko Yagi, Yuki Nishihata, Hideki Yamaji, Yasushi Shigeri, Tomohide Uno, Hiromasa Imaishi
The aromatic compound p -hydroxybenzoate (PHBA) is an important material with multiple applications, including as a building block of liquid crystal polymers in chemical industries. The cytochrome P450 (CYP) enzymes are beneficial monooxygenases for the synthesis of chemicals and CYP53A15 from fungus Cochliobolus lunatus is capable of the hydroxylation from benzoate to PHBA. Here we constructed a system for the bioconversion of benzoate to PHBA in Escherichia coli cells co-expressing CYP53A15 and human NADPH-P450 oxidoreductase ( CPR ) genes as a redox partner...
March 15, 2018: Journal of Microbiology and Biotechnology
Sureyya Mert Selimoglu, Murat Kasap, Gurler Akpinar, Aynur Karadenizli, Abdul Mounem Wis, Uzay Gormus
Human creatine kinase MB (hCKMB) is one of the most preferred biomarkers used for the diagnosis of acute coronary syndrome due to its high sensitivity and specificity. The increasing need for highly purified and biologically active hCKMB in the field of diagnostics makes its production valuable. Currently, the production of hCKMB is mainly achieved in methylotrophic yeast, Pichia pastoris, because the production in Escherichia coli is challenging and generally yields an inactive enzyme with a low quantity. With the aim of finding the best way for the high-yield production of active hCKMB in E...
March 14, 2018: Journal of Molecular Microbiology and Biotechnology
Hiroto Kambara, Fei Liu, Xiaoyu Zhang, Peng Liu, Besnik Bajrami, Yan Teng, Li Zhao, Shiyi Zhou, Hongbo Yu, Weidong Zhou, Leslie E Silberstein, Tao Cheng, Mingzhe Han, Yuanfu Xu, Hongbo R Luo
Gasdermin D (GSDMD) is considered a proinflammatory factor that mediates pyroptosis in macrophages to protect hosts from intracellular bacteria. Here, we reveal that GSDMD deficiency paradoxically augmented host responses to extracellular Escherichia coli, mainly by delaying neutrophil death, which established GSDMD as a negative regulator of innate immunity. In contrast to its activation in macrophages, in which activated inflammatory caspases cleave GSDMD to produce an N-terminal fragment (GSDMD-cNT) to trigger pyroptosis, GSDMD cleavage and activation in neutrophils was caspase independent...
March 13, 2018: Cell Reports
Yong-Zhe Zhu, Jing-Wen Liu, Xue Wang, In-Hong Jeong, Young-Joon Ahn, Chuan-Jie Zhang
The human β-site amyloid cleaving enzyme (BACE1) has been considered as an effective drug target for treatment of Alzheimer's disease (AD). In this study, Urechis unicinctus (U. unicinctus) , which is a Far East specialty food known as innkeeper worm, ethanol extract was studied by bioassay-directed fractionation and isolation to examine its potential β-site amyloid cleaving enzyme inhibitory and antimicrobial activity. The following compounds were characterized: hecogenin, cholest-4- en -3-one, cholesta-4,6- dien -3-ol, and hurgadacin...
March 14, 2018: Marine Drugs
Jon M Kaguni
DNA replication is an essential process. Although the fundamental strategies to duplicate chromosomes are similar in all free-living organisms, the enzymes of the three domains of life that perform similar functions in DNA replication differ in amino acid sequence and their three-dimensional structures. Moreover, the respective proteins generally utilize different enzymatic mechanisms. Hence, the replication proteins that are highly conserved among bacterial species are attractive targets to develop novel antibiotics as the compounds are unlikely to demonstrate off-target effects...
March 14, 2018: Antibiotics
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