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Bacteriophages

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https://www.readbyqxmd.com/read/29793207/infectivity-reduction-efficacy-of-uv-irradiation-and-peracetic-acid-uv-combined-treatment-on-ms2-bacteriophage-and-murine-norovirus-in-secondary-wastewater-effluent
#1
ShihChi Weng, Nathan Dunkin, Kellogg J Schwab, James McQuarrie, Kati Bell, Joseph G Jacangelo
Peracetic acid (PAA) is a strong oxidant/bactericide that has been applied in various industries (e.g., food processing, pharmaceuticals, medical device sterilization, etc.) as a disinfectant. There is increasing interest in using PAA for wastewater disinfection because it does not form halogenated byproducts, and no post-treatment quenching is required. Previous studies have demonstrated good efficiency in controlling bacteria in wastewater, but limited information is available for viruses, especially those hosted by mammals (e...
May 21, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29792678/combinatorially-screened-peptide-as-targeted-covalent-binder-alteration-of-bait-conjugated-peptide-to-reactive-modifier
#2
Shuta Uematsu, Yudai Tabuchi, Yuji Ito, Masumi Taki
A peptide-type covalent binder for a target protein was obtained by combinatorial screening of fluoroprobe-conjugated peptide libraries on bacteriophage T7. The solvatochromic fluoroprobe works as a bait during the affinity selection process of phage display. To obtain the targeted covalent binder, the bait in the selected consensus peptide was altered into a reactive warhead possessing a sulfonyl fluoride. The reaction efficiency and site / position specificity of the covalent conjugation between the binder and the target protein were evaluated by liquid chromatography-tandem mass spectrometry (LC-MS/MS), and rationalized by a protein-ligand docking simulation...
May 24, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29792526/phages-antibiotic-resistance-are-the-most-abundant-entities-on-earth-ready-for-a-comeback
#3
Colin Hill, Susan Mills, Reynolds P Ross
Bacteriophages, which lost out to antibiotic therapy in the past, may be poised to make a comeback. Once discarded because of their narrow activity spectrum, it can now be viewed as a major advantage that these intracellular, self-replicating entities can exert their killing effect with minimal damage to the commensal microbiome. In eastern Europe, phages continue to be used both prophylactically and therapeutically to treat infections. More recently, much needed regulated clinical trials are underway with a view to restoring phage therapy as a tool for mainstream medicine, although current regulations may impede their full potential...
May 24, 2018: Future Microbiology
https://www.readbyqxmd.com/read/29789681/genomic-and-ecological-study-of-two-distinctive-freshwater-bacteriophages-infecting-a-comamonadaceae-bacterium
#4
Kira Moon, Ilnam Kang, Suhyun Kim, Sang-Jong Kim, Jang-Cheon Cho
Bacteriophages of freshwater environments have not been well studied despite their numerical dominance and ecological importance. Currently, very few phages have been isolated for many abundant freshwater bacterial groups, especially for the family Comamonadaceae that is found ubiquitously in freshwater habitats. In this study, we report two novel phages, P26059A and P26059B, that were isolated from Lake Soyang in South Korea, and lytically infected bacterial strain IMCC26059, a member of the family Comamonadaceae...
May 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29787282/regulating-the-uptake-of-viral-nanoparticles-in-macrophage-and-cancer-cells-by-via-a-ph-switch
#5
Hamilton Lee, Candace E Benjamin, Chance M Nowak, Lana Tuong, Raymond P Welch, Zhuo Chen, Madushani Dharmarwardana, Kyle Murray, Leonidas Bleris, Sheena D'Arcy, Jeremiah J Gassensmith
Controlling the uptake of nanomaterials into phagocytes is a challenging problem. We describe an approach to inhibit the cellular uptake by macrophages and HeLa cells of nano-particles derived from bacteriophage Qβ by conjugating negatively charged terminal hexanoic acid moieties onto its surface. Additionally, we show hydrazone linkers can be installed between the surface of Qβ and the terminal hexa-noic acid moieties, resulting in a pH-responsive conjugate that, in acidic conditions, can release the terminal hexanoic acid moiety and allow for the uptake of the Qβ nanoparti-cle...
May 22, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29786121/genome-sequence-of-the-novel-virulent-bacteriophage-pmbt14-with-lytic-activity-against-pseudomonas-fluorescens-dsm-50090-r
#6
Sabrina Koberg, Stefanie Gieschler, Erik Brinks, Mareike Wenning, Horst Neve, Charles M A P Franz
Psychrotrophic gram-negative Pseudomonas spp. represent a serious problem in the dairy industry as they can cause spoilage of milk and dairy products. Bacteriophages have moved into focus as promising biocontrol agents for such food spoilage bacteria. The virulent Siphoviridae phage PMBT14 was isolated on a mutant variant of P. fluorescens DSM 50090 challenged with an unrelated virulent P. fluorescens DSM 50090 Podoviridae phage (i.e., mutant strain DSM 50090R ). PMBT14 has a 47,820-bp dsDNA genome with 76 predicted open reading frames (ORFs)...
May 21, 2018: Archives of Virology
https://www.readbyqxmd.com/read/29785946/-crispr-cas-systems-in-genome-engineering-of-bacteriophages
#7
Cai Jiao Liang, Fan Mei Meng, Yun Can Ai
Researches on CRISPR/Cas (clustered regularly interspaced short palindromic repeats/CRISPR-associated genes) systems, that are adaptive immunity systems encoded by prokaryotes, have promoted the development of new genome-editing tools. Bacteriophages are not only the driving elements for the evolution of prokaryotes' CRISPR arrays, but also the targets of the CRISPR/Cas systems. Studies on functional genomics of bacteriophages have been lagging behind the discovery of new phage strains and the sequencing of their genomes...
May 20, 2018: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/29785502/comparative-persistence-of-human-sewage-specific-enterococcal-bacteriophages-in-freshwater-and-seawater
#8
Namfon Booncharoen, Skorn Mongkolsuk, Kwanrawee Sirikanchana
Enterococcus faecalis bacteria have been recently reported for their ability to host bacteriophages that are specifically from human sewage, suggesting their application to track human fecal contamination in water resources. However, little is known about the survivability of sewage-specific enterococcal bacteriophages in various water matrices under ambient and storage conditions. In this study, bacteriophages that were derived from the Thailand-isolated E. faecalis strains AIM06 and SR14 exhibited morphologies consistent with the Siphoviridae, Podoviridae, and Myoviridae families...
May 21, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29785480/potential-treatment-options-in-a-post-antibiotic-era
#9
R R Bragg, C M Meyburgh, J-Y Lee, M Coetzee
Following the Golden Age of antibiotic discovery in the previous century, the rate of antibiotic discovery has plummeted during the past 50 years while the incidence of antimicrobial resistance is ever-increasing. Presently, humankind is forced to address a major public health threat in the form of multiple drug resistance and urgent action is required to halt the advent of a post-antibiotic era. This chapter aims to draw the attention to the escalating global crisis of antimicrobial resistance fueled by the irresponsible use of antibiotics in healthcare and animal production sectors...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29784828/biological-species-in-the-viral-world
#10
Louis-Marie Bobay, Howard Ochman
Due to their dependence on cellular organisms for metabolism and replication, viruses are typically named and assigned to species according to their genome structure and the original host that they infect. But because viruses often infect multiple hosts and the numbers of distinct lineages within a host can be vast, their delineation into species is often dictated by arbitrary sequence thresholds, which are highly inconsistent across lineages. Here we apply an approach to determine the boundaries of viral species based on the detection of gene flow within populations, thereby defining viral species according to the biological species concept (BSC)...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29782143/anti-tumor-humoral-and-t-cell-responses-by-mucin-1-conjugates-of-bacteriophage-qb-in-wildtype-mice
#11
Zhaojun Yin, Xuanjun Wu, Katarzyna Kaczanowska, Suttipun Sungsuwan, Marta Comellas-Aragones, Christian Pett, Jin Yu, Claire Baniel, Ulrika Westerlind, M G Finn, Xuefei Huang
Mucin-1 (MUC1) is one of the top ranked tumor associated antigens. In order to generate effective anti-MUC1 immune responses as potential anti-cancer vaccines, MUC1 peptides and glycopeptides have been covalently conjugated to bacteriophage Qb. Immunization of mice with these constructs led to highly potent antibody responses with IgG titers over one million, which are among the highest anti-MUC1 IgG titers reported to date. Furthermore, the high IgG antibody levels persisted for more than six months. The constructs also elicited MUC1 specific cytotoxic T cells, which can selectively kill MUC1 positive tumor cells...
May 21, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29780362/characterization-and-genomic-study-of-phage-vb_ecos-b2-infecting-multidrug-resistant-escherichia-coli
#12
Yue Xu, Xinyan Yu, Yu Gu, Xu Huang, Genyan Liu, Xiaoqiu Liu
The potential of bacteriophage as an alternative antibacterial agent has been reconsidered for control of pathogenic bacteria due to the widespread occurrence of multi-drug resistance bacteria. More and more lytic phages have been isolated recently. In the present study, we isolated a lytic phage named vB_EcoS-B2 from waste water. VB_EcoS-B2 has an icosahedral symmetry head and a long tail without a contractile sheath, indicating that it belongs to the family Siphoviridae . The complete genome of vB_EcoS-B2 is composed of a circular double stranded DNA of 44,283 bp in length, with 54...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29780361/challenges-and-promises-for-planning-future-clinical-research-into-bacteriophage-therapy-against-pseudomonas-aeruginosa-in-cystic-fibrosis-an-argumentative-review
#13
REVIEW
Martina Rossitto, Ersilia V Fiscarelli, Paola Rosati
Although early aggressive and prolonged treatment with specific antibiotics can extend survival in patients with cystic fibrosis (CF) colonized by opportunistic Pseudomonas aeruginosa (PA), antibiotics fail to eradicate the infecting multidrug-resistant (MDR) PA strains in CF. Century-long research has suggested treating patients with bacteriophages (phages, prokaryotic viruses) naturally hosted by bacteria. Although the only phage types used in therapy, lytic phages, lyse PA aggregated in biofilm matrix by depolymerase degrading enzymes, how they can effectively, safely, and persistently do so in patients with CF is unclear...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29779148/in-vitro-virulence-characteristics-of-rare-serovars-of-salmonella-enterica-isolated-from-sand-lizards-lacerta-agilis-l
#14
Joanna Mokracka, Sylwia Krzymińska, Danił Ałtunin, Dariusz Wasyl, Ryszard Koczura, Krzysztof Dudek, Monika Dudek, Zofia Anna Chyleńska, Anna Ekner-Grzyb
The aim of this study was to estimate virulence potential of Salmonella enterica strains colonizing the gut of free-living sand lizards (Lacerta agilis L.). The strains belonged to three Salmonella serovars: Abony, Schleissheim, and Telhashomer. Adhesion and invasion abilities of the strains were determined in quantitative assays using the gentamicin protection method. Induction of apoptosis was assessed using HeLa cell monolayers. PCR assays were used for detection of 26 virulence genes localised within mobile elements: pathogenicity islands, virulence plasmids, and prophage sequences...
May 19, 2018: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29778530/exploiting-bacteriophage-proteomes-the-hidden-biotechnological-potential
#15
REVIEW
Sílvio B Santos, Ana Rita Costa, Carla Carvalho, Franklin L Nóbrega, Joana Azeredo
Bacteriophages encode many distinct proteins for the successful infection of a bacterial host. Each protein plays a specific role in the phage replication cycle, from host recognition, through takeover of the host machinery, and up to cell lysis for progeny release. As the roles of these proteins are being revealed, more biotechnological applications can be anticipated. Phage-encoded proteins are now being explored for the control, detection, and typing of bacteria; as vehicles for drug delivery; and for vaccine development...
May 16, 2018: Trends in Biotechnology
https://www.readbyqxmd.com/read/29777837/bacteriophage-research-what-we-have-learnt-and-what-still-needs-to-be-addressed
#16
Andrew M Kropinski
Research on bacteriophages has significantly enhanced our understanding of molecular biology, the genomes of prokaryotic cells, and viral ecology. Phages and lysins offer a viable alternative to the declining utility of antibiotics in this post-antibiotic era. They also provide ideal teaching tools for genomics and bioinformatics. This article touches on the first 100 years of phage research with the author commenting on what he thinks are the highlights, and what needs to be addressed.
May 16, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29777836/phage-therapy-against-achromobacter-xylosoxidans-lung-infection-in-a-patient-with-cystic-fibrosis-a-case-report
#17
N Hoyle, P Zhvaniya, N Balarjishvili, D Bolkvadze, L Nadareishvili, D Nizharadze, J Wittmann, C Rohde, M Kutateladze
Respiratory infections can lead to serious complications in CF patients, especially when infected with antibiotic resistant bacteria. Alternative treatments for these infections are being sought out to help address this problem. We present a clinical case of a cystic fibrosis (CF) patient, with multi-drug resistant (MDR) Achromobacter xylosoxidans chronic lung infection who was successfully managed with bacteriophage therapy.
May 16, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29777835/combined-bacteriophages-and-antibiotics-as-an-efficient-therapy-against-vre-enterococcus-faecalis-in-a-mouse-model
#18
Daniel Gelman, Shaul Beyth, Vanda Lerrer, Karen Adler, Ronit Poradosu-Cohen, Shunit Coppenhagen-Glazer, Ronen Hazan
Clinical applications of bacteriophage therapy have been recently gathering significant attention worldwide, used mostly as rescue therapy in cases of near-fatal antibiotic failure. Thus, clinically relevant in-vivo models presenting both short- and long-term implications of phage therapy given as rescue treatment for fulminant infections are of highest importance. In this study, a cocktail consisting of two lytic bacteriophages was used to evaluate the therapeutic efficacy of phage therapy as a rescue treatment for severe septic peritonitis in a mouse model...
May 16, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29773011/antibacterial-activity-of-novel-strains-of-bacteriophages-an-experimental-approach
#19
Muhammad Imran Qadir, Zunera Chauhdary
The evolution of antibiotic resistance in bacteria has increased research in the development of alternative therapies to conventional drugs. In this study, isolated phages were characterized and antibacterial activity was determined by standard agar disc diffusion method. The phages showed maximum propagation at 37°C to 40°C and highest viability at pH 7. Sugars influenced the bacteriophage viability. Sodium chloride decreased the phage propagation. Calcium chloride and magnesium chloride increased the phage propagation up to a certain limit...
2018: Critical Reviews in Eukaryotic Gene Expression
https://www.readbyqxmd.com/read/29772006/lessons-from-bacteriophages-part-2-a-saga-of-scientific-breakthroughs-and-prospects-for-their-use-in-human-health
#20
Kunica Asija, Carolyn M Teschke
No abstract text is available yet for this article.
May 2018: PLoS Pathogens
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