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Elina Cernooka, Janis Rumnieks, Kaspars Tars, Andris Kazaks
Modern DNA sequencing capabilities have led to the discovery of a large number of new bacteriophage genomes, which are a rich source of novel proteins with an unidentified biological role. The genome of Enterobacter cancerogenus bacteriophage Enc34 contains several proteins of unknown function that are nevertheless conserved among distantly related phages. Here, we report the crystal structure of a conserved Enc34 replication protein ORF6 which contains a domain of unknown function DUF2815. Despite the low (~15%) sequence identity, the Enc34 ORF6 structurally resembles the gene 2...
November 14, 2017: Scientific Reports
Josiane Ferreira Pires, Larissa de Souza Cardoso, Rosane Freitas Schwan, Cristina Ferreira Silva
Cultivable microbiota presents in a coffee semi-dry processing wastewater treatment plant (WTP) was identified. Thirty-two operational taxonomic units (OTUs) were detected, these being 16 bacteria, 11 yeasts and 4 filamentous fungi. Bacteria dominated the microbial population (11.61 log CFU mL(- 1)), and presented the highest total diversity index when observed in the WTP aerobic stage (Shannon = 1.94 and Simpson = 0.81). The most frequent bacterial species were Enterobacter asburiae, Sphingobacterium griseoflavum, Chryseobacterium bovis, Serratia marcescens, Corynebacterium flavescens, Acetobacter orientalis and Acetobacter indonesiensis; these showed the largest total bacteria populations in the WTP, with approximately 10 log CFU mL(- 1)...
November 13, 2017: World Journal of Microbiology & Biotechnology
Mojgan Sabet, Ziad Tarazi, Debora Rubio-Aparicio, Thomas G Nolan, Jonathan Parkinson, Olga Lomovskaya, Michael N Dudley, David C Griffith
The objective of these studies was to evaluate the exposures of meropenem and vaborbactam that would produce antibacterial activity and prevent resistance development in carbapenem-resistant, Klebsiella pneumoniae carbapenemase (KPC)-producing Enterobacteriaceae strains when tested at an inocula of 10(8) CFU/mL. Thirteen K. pneumoniae isolates, three Enterobacter cloacae isolates, and one Escherichia coli isolate were examined in an in vitro hollow fiber model over 32 hours. Simulated dosage regimens of meropenem 1-2 g with vaborbactam 1-2 g, meropenem administered every 8 hours by 3 hour infusion based on Phase 1 or Phase 3 patient pharmacokinetic data were studied in the model...
November 13, 2017: Antimicrobial Agents and Chemotherapy
Xia Tang, Bingxin Liu, Qiusui Deng, Ruitao Zhang, Xue Li, Heng Xu
To develop an efficient and environmental-friendly approach to detoxicate nickel (Ni) and fluoranthene co-contaminated soil, the combined application of Coprinus comatus (C. comatus) with Serratia sp. FFC5 and/or Enterobacter sp. E2 was investigated. The pot experiment tested the influences of bacterial inoculation on the growth of C. comatus, content of Ni in C. comatus, Ni speciation in soil, fluoranthene dissipation, soil enzymatic activities, bacterial population and community structure. With the inoculation of bacteria, the fresh weights of C...
November 10, 2017: Journal of Environmental Management
Renpeng Du, Gang Song, Dan Zhao, Jian Sun, Wenxiang Ping, Jingping Ge
The bacterial diversity and community structure involved in Chinese sauerkraut is one of the most important factors shaping the final characteristics of traditional foods. In this research, Lactobacillus casei 11MZ-5-1 was applied in Chinese sauerkraut fermentation as a starter culture. Illumina Miseq sequencing analysis was used to reveal the bacterial diversity and community structure during Chinese sauerkraut fermentation. A total of 177283 high quality reads of 16S rRNA V4 regions were obtained. The inoculation of L...
November 13, 2017: Letters in Applied Microbiology
Mitali Mishra, Shashank Patole, Harapriya Mohapatra
Enterobacter spp. have been implicated as opportunistic pathogens which over the years have gained resistance toward most of the available therapeutic drugs. We sequenced two multidrug-resistant Enterobacter cloacae isolates harboring multiple efflux pump genes. These isolates exhibited strain-specific modulation of efflux pump protein expression.
November 9, 2017: Genome Announcements
Xi Li, Yongze Zhu, Mengyuan Shen, Jing Du, Lei Zhang, Dairong Wang
OBJECTIVES: Enterobacter cloacae is one of the major pathogens responsible for a variety of human infections. Here, we report the draft genome sequence of a multidrug-resistant E. cloacae strain HBY that was isolated from a female in China. METHODS: Whole-genomic DNA of E. cloacae strain HBY was extracted and was sequenced using an Illumina-Hiseq™ 2000 platform. The generated sequence reads were assembled using CLC Genomics Workbench. The draft genome was annotated using Rapid Annotation using Subsystem Technology and the presence of antimicrobial resistance genes was identified...
November 6, 2017: Journal of Global Antimicrobial Resistance
LongFei Zhao, YaJun Xu, XinHe Lai
A total of 276 endophytic bacteria were isolated from the root nodules of soybean (Glycine max L.) grown in 14 sites in Henan Province, China. The inhibitory activity of these bacteria against pathogenic fungus Phytophthora sojae 01 was screened in vitro. Six strains with more than 63% inhibitory activities were further characterized through optical epifluorescence microscopic observation, sequencing, and phylogenetic analysis of 16S rRNA gene, potential plant growth-promoting properties analysis, and plant inoculation assay...
October 13, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Marília Viana Albuquerque de Almeida, Ítalo Mendes Cangussú, Antonia Leonadia Siqueira de Carvalho, Izabelly Linhares Ponte Brito, Renata Albuquerque Costa
The present study aims to detect the production of extended-spectrum beta-lactamases (ESBL) by enterobacteria isolated from samples of fresh shrimp and fish obtained from the retail trade of the city of Sobral, Ceará State, Brazil. All bacterial isolates were submitted to identification and antimicrobial susceptibility testing using aminopenicillin, beta-lactamase inhibitors, carbapenem, 1st, 2nd, 3rd and 4th generation cephalosporins, and monobactam. Three types of beta-lactamases - ESBL, AmpC and KPC - were investigated...
November 6, 2017: Revista do Instituto de Medicina Tropical de São Paulo
Juan G Duero Posada, Yasbanoo Moayedi, Mosaad Alhussein, Paul E Bunce, Terrence M Yau, Heather J Ross
A 60-year-old woman with a history of dilated cardiomyopathy underwent heart transplantation. One month post-discharge, she presented to clinic with low-grade fever and productive cough. Her chest radiograph showed air-fluid levels in the pericardial silhouette. Transthoracic echocardiogram showed a large complex pericardial collection with no evidence of cardiac tamponade. The patient was urgently taken to the operating room for exploration. A large "egg-shaped" mass in the pericardium measuring 10x12 cm with gaseous material was aspirated...
November 4, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
H Y Liu, R Hou, G Q Yang, F Zhao, W G Dong
The experiment was conducted to investigate the in vitro effects of inulin and soya bean oligosaccharide (SBO) on the metabolism of L-tryptophan (L-try) to skatole production, and the intestinal microbiota in broilers. Treatments were as follows: caecal microbiota control (Cc), Cc + inulin, Cc + SBO, rectal microbiota control (Rc), Rc + inulin and Rc + SBO. Microbial suspensions were anaerobically incubated at 38°C for 24 hr. The results showed that concentrations of skatole and acetic acid were significantly lower in caecal microbiota fermentation broth (MFB) than those in rectal MFB (p < ...
November 3, 2017: Journal of Animal Physiology and Animal Nutrition
Amit Frenkel, Abraham Borer, Aviel Roy-Shapira, Evgeni Brotfain, Leonid Koyfman, Lisa Saidel-Odes, Alir Adina, Moti Klein
BACKGROUND: The authors describe a multifaceted cross-infection control program that was implemented to contain an epidemic of multidrug-resistant microorganisms (MRO) (carbapenem resistant Pseudomonas aeruginosa and Acinetobacter baumannii; extended spectrum β-lactamase producing Klebsiella pneumoniae, Escherichia coli, Enterobacter Cloacae, and Proteus mirabilis; and ‎methicillin-resistant Staphylococcus aureus and Candida species). OBJECTIVES: To assess the effect of a control program on the incidence of cross-infection with MRO...
October 2017: Israel Medical Association Journal: IMAJ
J C Ribeiro Júnior, A M de Oliveira, F de G Silva, R Tamanini, A L M de Oliveira, V Beloti
Refrigerated raw milk may contain psychrotrophic microorganisms that produce thermoresistant exoproteases and lipases, which may compromise the quality of processed fluid milk and dairy products during storage. The aim of this work was to quantify and identify the deteriorating psychrotrophic microbiota in Brazilian refrigerated raw milk using genetic diversity analysis. The mean psychrotrophic count was 1.1 × 10(4) cfu/mL. Of the total isolates, 47.8 and 29.8% showed deteriorating activity at 35°C within 48 h and 7°C within 10 d, respectively...
October 25, 2017: Journal of Dairy Science
K L Hon, M Ip, C K Wong, Ben C L Chan, P C Leung, T F Leung
BACKGROUND: In a series of bench and clinical trials, our group has determined the immunologic effects and clinical efficacy of a concoction of five herbal ingredients (PentaHerbs Formula, PHF) in treating children with atopic eczema (AE). This study investigates the antimicrobial effects that may be induced with PHF treatment. METHODS: We investigated the effects of PHF on the minimal inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of staphylococcus aureus and various bacteria that are commonly present on the skin of patients with AE...
November 3, 2017: Journal of Dermatological Treatment
Yan Wu, Yaqiao Hao, Xuan Wei, Qi Shen, Xuanwei Ding, Liyan Wang, Hongxin Zhao, Yuan Lu
Background: Enterobacter aerogenes is a facultative anaerobe and is one of the most widely studied bacterial strains because of its ability to use a variety of substrates, to produce hydrogen at a high rate, and its high growth rate during dark fermentation. However, the rate of hydrogen production has not been optimized. In this present study, three strategies to improve hydrogen production in E. aerogenes, namely the disruption of nuoCDE, overexpression of the small RNA RyhB and of NadE to regulate global anaerobic metabolism, and the redistribution of metabolic flux...
2017: Biotechnology for Biofuels
Valérie Denervaud-Tendon, Laurent Poirel, Lynn E Connolly, Kevin M Krause, Patrice Nordmann
Objectives: Plazomicin, a novel aminoglycoside with in vitro activity against MDR Gram-negative organisms, is under development to treat patients with serious enterobacterial infections. We evaluated the activity of plazomicin and comparators against colistin-resistant enterobacterial isolates. Methods: Susceptibility to plazomicin and comparators was tested by broth microdilution for a collection of 95 colistin-resistant enterobacterial isolates collected from 29 hospitals in eight countries...
October 1, 2017: Journal of Antimicrobial Chemotherapy
Amar A Telke, Abiola Olumuyiwa Olaitan, Serge Morand, Jean-Marc Rolain
Background: Colistin is the last drug option for the treatment of MDR Gram-negative bacterial infections. Several types of resistance to colistin have been identified, including hetero-resistance, which has been observed in several Gram-negative pathogens. During a routine surveillance project on antimicrobial resistance, we found abnormal colistin-resistant Enterobacter asburiae and Enterobacter cloacae isolates. E. cloacae is an intestinal commensal bacterium and a well-known opportunistic nosocomial pathogen...
October 1, 2017: Journal of Antimicrobial Chemotherapy
Huawei Liu, Lei Zhang, Aihua Meng, Junbiao Zhang, Miaomiao Xie, Yaohong Qin, Dylan Chase Faulk, Baohong Zhang, Shushen Yang, Li Qiu
Ten strains of endophytic diazotroph were isolated and identified from the plants collected from three different agricultural crop species, wheat, rice and maize, using the nitrogen-free selective isolation conditions. The nitrogen-fixing ability of endophytic diazotroph was verified by the nifH-PCR assay that showed positive nitrogen fixation ability. These identified strains were classified by 879F-RAPD and 16S rRNA sequence analysis. RAPD analyses revealed that the 10 strains were clustered into seven 879F-RAPD groups, suggesting a clonal origin...
2017: PloS One
Majida Khanafer, Husain Al-Awadhi, Samir Radwan
Raw, domestic sewage of Kuwait City contained about 10(6) ml(-1) colony forming units of Enterobacter hormaechei subsp. oharae (56.6%), Klebsiella spp. (36%), and Escherichia coli (7.4%), as characterized by their 16S rRNA-gene sequences. The isolated coliforms grew successfully on a mineral medium with crude oil vapor as a sole source of carbon and energy. Those strains also grew, albeit to different degrees, on individual n-alkanes with carbon chains between C9 and C36 and on the individual aromatic hydrocarbons, toluene, naphthalene, phenanthrene, and biphenyl as sole sources of carbon and energy...
2017: BioMed Research International
Chuanqing Zhong, Chao Zhang, Jiafang Fu, Wenbing Chen, Tianyi Jiang, Guangxiang Cao
Enterobacter cloacae strain R11 is a multidrug-resistant bacterium isolated from sewage water near a swine feedlot in China. Strain R11 can survive in medium with up to 192 μg/ml polymyxin E, indicating a tolerance for this antibiotic significantly higher than that reported for other gram-negative bacteria. In this study, conjugation experiments showed that partial polymyxin E resistance could be transferred from strain R11 to Escherichia coli strain 25922, revealing that some genes related to polymyxin E resistance are plasmid-based...
October 26, 2017: Canadian Journal of Microbiology
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