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Leonardo da Costa Bastos, Felipe Rodrigues de Souza, Lucas Miguel Pereira Souza, Pat Forgione, Teobaldo Cuya, Ricardo Bicca de Alencastro, Andre Silva Pimentel, Tanos Celmar Costa França
No abstract text is available yet for this article.
March 15, 2018: Journal of Biomolecular Structure & Dynamics
Deepti Chaturvedi, Radhakrishnan Mahalakshmi
Transmembrane β-barrel proteins (OMPs) are highly robust structures for engineering and development of nanopore channels, surface biosensors, and display libraries. Expanding the applications of designed OMPs requires the identification of elements essential for β-barrel scaffold formation and stability. Here, we have designed chimeric 8-stranded OMPs composed of strand hybrids of Escherichia coli OmpX and Yersinia pestis Ail, and identified molecular motifs essential for β-barrel scaffold formation. For the OmpX/Ail chimeras, we find that the central hairpin strands β4-β5 in tandem are vital for β-barrel folding...
March 14, 2018: Biochemistry
Katalin Szabó, Rudolf Gesztelyi, Nóra Lampé, Rita Kiss, Judit Remenyik, Georgina Pesti-Asbóth, Dániel Priksz, Zoltán Szilvássy, Béla Juhász
Fenugreek is a common herb possessing several bioactive components including diosgenin. Here, dietary fenugreek seed flour and diosgenin were evaluated on a model of endothelium-dependent vasorelaxation by abdominal aortas isolated from rats receiving high-fat, high-sugar diet (HFHSD). 60 male Wistar rats were randomized into six groups: (i) negative control getting conventional rat feed regimen; (ii) positive control receiving HFHSD; (iii) a test group fed 2 g/kg bw/day fenugreek seed flour (containing 10 mg/kg bw/day diosgenin) + HFHSD; (iv) three test groups fed 1, 10 and 50 mg/kg bw/day diosgenin + HFHSD...
March 10, 2018: International Journal of Molecular Sciences
Charlene Luján-Vega, Michelle G Hawkins, Christine K Johnson, Christopher Briggs, Chris Vennum, Peter H Bloom, Joshua M Hull, Carolyn Cray, Denise Pesti, Lisa Johnson, Paula Ciembor, Branson R Ritchie
Chlamydiaceae bacteria infect many vertebrate hosts, and previous reports based on polymerase chain reaction (PCR) assays and serologic assays that are prone to cross-reaction among chlamydial organisms have been used to describe the prevalence of either DNA fragments or antibodies to Chlamydia spp. in wild raptorial populations. This study reports the PCR-based prevalence of Chlamydiaceae DNA that does not 100% match any avian or mammalian Chlamydiaceae in wild populations of hawks in California Buteo species...
March 2018: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Nikoletta Czotter, János Molnár, Réka Pesti, Emese Demián, Dániel Baráth, Tünde Varga, Éva Várallyay
Woody perennial plants like grapevine and fruit trees can be infected by several viruses even as multiple infections. Since they are propagated vegetatively, the phytosanitary status of the propagation material (both the rootstock and the variety) can have a profound effect on the lifetime and health of the new plantations. The fast evolution of sequencing techniques provides a new opportunity for metagenomics-based viral diagnostics. Viral derived small RNAs produced by the host immune system during viral infection can be sequenced by next-generation techniques and analyzed for the presence of viruses, revealing the presence of all known viral pathogens in the sample...
2018: Methods in Molecular Biology
Sophia Häfner, Erik Fumi
Article highlight based on "Bioluminescent tracing of a Yersinia pestis pCD1+-mutant and Yersinia pseudotuberculosis in subcutaneously infected mice" by Yazhou Zhou et al.
February 24, 2018: Microbes and Infection
Xiangna Zhao, Yujun Cui, Yanfeng Yan, Zongmin Du, Yafang Tan, Huiying Yang, Yujing Bi, Pingping Zhang, Lei Zhou, Dongsheng Zhou, Yanping Han, Yajun Song, Xiaoyi Wang, Ruifu Yang
No abstract text is available yet for this article.
March 15, 2018: Journal of Virology
Michael G Connor, Amanda R Pulsifer, Donghoon Chung, Eric C Rouchka, Brian K Ceresa, Matthew B Lawrenz
Yersinia pestis has evolved many strategies to evade the innate immune system. One of these strategies is the ability to survive within macrophages. Upon phagocytosis, Y. pestis prevents phagolysosome maturation and establishes a modified compartment termed the Yersinia -containing vacuole (YCV). Y. pestis actively inhibits the acidification of this compartment, and eventually, the YCV transitions from a tight-fitting vacuole into a spacious replicative vacuole. The mechanisms to generate the YCV have not been defined...
February 20, 2018: MBio
Clarice de Azevedo Souza, Kristian L Richards, YoSon Park, Michael Schwartz, Julie Torruellas Garcia, Sara Schesser Bartra, Gregory V Plano
The needle structures of type III secretion (T3S) systems are formed by the secretion and polymerization of a needle subunit protein, YscF in Yersinia pestis. A subset of T3S systems employ unique heterodimeric chaperones, YscE and YscG in Y. pestis, to prevent the polymerization of needle subunits within the bacterial cell. We demonstrate that the YscE/YscG chaperone is also required for stable YscF expression and for secretion of YscF. Overexpression of a functional maltose-binding protein (MBP)-YscG hybrid protein stabilized cytoplasmic YscF but YscF was not secreted in the absence of YscE...
February 5, 2018: Microbiology
Stanley S Nyirenda, Bernard M Hang Ombe, Edgar Simulundu, Evans Mulenga, Ladslav Moonga, Robert S Machang U, Gerald Misinzo, Bukheti S Kilonzo
BACKGROUND: Plague is a flea-borne zoonotic and invasive disease caused by a gram negative coccobacillus bacterium called Yersinia pestis. Plague has caused three devastating pandemics globally namely: the Justinian, Black Death and Oriental plague. The disease in the Eastern Province of Zambia has been reported in Nyimba and Sinda Districts in the past 15 years. The aim of this study was to investigate the molecular epidemiology of plague in the two affected districts. Polymerase Chain Reaction (PCR), targeting Plasminogen activator gene (pla gene) of Y...
January 4, 2018: BMC Microbiology
Lili Wang, Shuangshuang Zhao, Xiaotian Kong, Lingling Cao, Sheng Tian, Yonghao Ye, Chunhua Qiao
A series of novel pyraclostrobin derivatives were designed and prepared as antifungal agents. Their antifungal activities were tested in vitro with five important phytopathogenic fungi, namely, Batrylis cinerea, Phytophthora capsici, Fusarium sulphureum, Gloeosporium pestis and Sclerotinia sclerotiorum using the mycelium growth inhibition method. Among these compounds, 5s displayed IC50 value of 0.57 μg/mL against Batrylis cinerea and 5k-II displayed IC50 value of 0.43 μg/mL against Sclerotinia sclerotiorum, which were close to that of the positive control pyraclostrobin (0...
January 10, 2018: Bioorganic & Medicinal Chemistry
Adva Mechaly, Einat Vitner, Haim Levy, Shay Weiss, Elad Bar-David, David Gur, Michal Koren, Hila Cohen, Ofer Cohen, Emanuelle Mamroud, Morly Fisher
Multiplexed detection technologies are becoming increasingly important given the possibility of bioterrorism attacks, where the range of suspected pathogens can vary considerably. In this work, we describe the use of Luminex MagPlex magnetic microspheres for the construction of two multiplexed diagnostic suspension arrays, enabling the antibody-based detection of bacterial pathogens and their related disease biomarkers directly from blood cultures.The first 4-plex diagnostic array enabled the detection of both anthrax and plague infections using soluble disease biomarkers, including PA (Protective Antigen) and anthrax capsular antigen for anthrax detection and the capsular F1 and LcrV antigens for plague detection...
January 31, 2018: Journal of Clinical Microbiology
Jeff Nivala, Seth L Shipman, George M Church
The adaptation phase of CRISPR-Cas immunity depends on the precise integration of short segments of foreign DNA (spacers) into a specific genomic location within the CRISPR locus by the Cas1-Cas2 integration complex. Although off-target spacer integration outside of canonical CRISPR arrays has been described in vitro, no evidence of non-specific integration activity has been found in vivo. Here, we show that non-canonical off-target integrations can occur within bacterial chromosomes at locations that resemble the native CRISPR locus by characterizing hundreds of off-target integration locations within Escherichia coli...
January 29, 2018: Nature Microbiology
Robert J Dusek, Anne Justice-Allen, Barbara Bodenstein, Susan Knowles, Daniel A Grear, Laura Adams, Craig Levy, Hayley D Yaglom, Valerie I Shearn-Bochsler, Paula G Ciembo, Christopher R Gregory, Denise Pesti, Branson W Ritchie
  In 2013, a mortality event of nonnative, feral Rosy-faced Lovebirds ( Agapornis roseicollis) in residential backyards in Maricopa County, Arizona, USA was attributed to infection with Chlamydia psittaci. In June 2014, additional mortality occurred in the same region. Accordingly, in August 2014 we sampled live lovebirds and sympatric bird species visiting backyard bird feeders to determine the prevalence of DNA and the seroprevalence of antibodies to C. psittaci using real-time PCR-based testing and elementary body agglutination, respectively...
January 25, 2018: Journal of Wildlife Diseases
David M Bland, Clayton O Jarrett, Christopher F Bosio, B Joseph Hinnebusch
Fleas can transmit Yersinia pestis by two mechanisms, early-phase transmission (EPT) and biofilm-dependent transmission (BDT). Transmission efficiency varies among flea species and the results from different studies have not always been consistent. One complicating variable is the species of rodent blood used for the infectious blood meal. To gain insight into the mechanism of EPT and the effect that host blood has on it, fleas were fed bacteremic mouse, rat, guinea pig, or gerbil blood; and the location and characteristics of the infection in the digestive tract and transmissibility of Y...
January 22, 2018: PLoS Pathogens
David W Markman, Michael F Antolin, Richard A Bowen, William H Wheat, Michael Woods, Mercedes Gonzalez-Juarrero, Mary Jackson
Plague ecology is characterized by sporadic epizootics, then periods of dormancy. Building evidence suggests environmentally ubiquitous amebae act as feral macrophages and hosts to many intracellular pathogens. We conducted environmental genetic surveys and laboratory co-culture infection experiments to assess whether plague bacteria were resistant to digestion by 5 environmental ameba species. First, we demonstrated that Yersinia pestis is resistant or transiently resistant to various ameba species. Second, we showed that Y...
February 2018: Emerging Infectious Diseases
Angelina A Kislichkina, Alexandr G Bogun, Lidiya A Kadnikova, Nadezhda V Maiskaya, Viktor I Solomentsev, Svetlana V Dentovskaya, Sergey V Balakhonov, Andrey P Anisimov
We report here the draft genome sequences of nine Yersinia pestis subsp. microtus bv. Altaica strains isolated from the Altai Mountain plague focus (no. 36), which represent the 0.PE4 phylogroup circulating in populations of Mongolian pika (Ochotona pallasi).
January 18, 2018: Genome Announcements
Larissa Leão Ferrer de Sousa, Carlos Henrique Morais de Alencar, Alzira Maria Paiva de Almeida, Luciano Pamplona de Góes Cavalcanti
INTRODUCTION: In Brazil, the plague is established in several foci located mainly in the northeastern part of the country, where it alternates between active and quiescent periods. These foci in the State of Ceará have high epidemiological importance. In addition to other plague detection activities, plague areas can be monitored through serological surveys of dogs and cats (domestic carnivores), which, following feeding on plague-infected rodents, can develop mild to severe forms of the disease and produce long-lasting antibodies...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
Katharine R Dean, Fabienne Krauer, Lars Walløe, Ole Christian Lingjærde, Barbara Bramanti, Nils Chr Stenseth, Boris V Schmid
Plague, caused by the bacterium Yersinia pestis, can spread through human populations by multiple transmission pathways. Today, most human plague cases are bubonic, caused by spillover of infected fleas from rodent epizootics, or pneumonic, caused by inhalation of infectious droplets. However, little is known about the historical spread of plague in Europe during the Second Pandemic (14-19th centuries), including the Black Death, which led to high mortality and recurrent epidemics for hundreds of years. Several studies have suggested that human ectoparasite vectors, such as human fleas (Pulex irritans) or body lice (Pediculus humanus humanus), caused the rapidly spreading epidemics...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
Mehdi Assmar, Marjan Keypour, Mehdi Rohani, Ehsan Mostafavi, Dariush Daneshvar Farhud
Background: The present study was conducted approximately 40 years ago, but its results have not been released. At the time of this study, the importance of the gut microbiota was not fully understood. Methods: Meriones persicus rodents, as one of the major reservoirs of Yersinia pestis bacterium in Iran, were compared in a disease endemic area (Akanlu, Hamadan, western Iran) and a non-endemic zone (Telo, Tehran, Iran) from 1977 to 1981. Results: This study was able to transmit the resistance to Y...
January 2018: Iranian Journal of Public Health
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