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Nature Microbiology

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https://www.readbyqxmd.com/read/28715405/identification-and-pathological-characterization-of-persistent-asymptomatic-ebola-virus-infection-in-rhesus-monkeys
#1
Xiankun Zeng, Candace D Blancett, Keith A Koistinen, Christopher W Schellhase, Jeremy J Bearss, Sheli R Radoshitzky, Shelley P Honnold, Taylor B Chance, Travis K Warren, Jeffrey W Froude, Kathleen A Cashman, John M Dye, Sina Bavari, Gustavo Palacios, Jens H Kuhn, Mei G Sun
Ebola virus (EBOV) persistence in asymptomatic humans and Ebola virus disease (EVD) sequelae have emerged as significant public health concerns since the 2013-2016 EVD outbreak in Western Africa. Until now, studying how EBOV disseminates into and persists in immune-privileged sites was impossible due to the absence of a suitable animal model. Here, we detect persistent EBOV replication coinciding with systematic inflammatory responses in otherwise asymptomatic rhesus monkeys that had survived infection in the absence of or after treatment with candidate medical countermeasures...
July 17, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28714967/architecture-of-the-type-iv-coupling-protein-complex-of-legionella-pneumophila
#2
Mi-Jeong Kwak, J Dongun Kim, Hyunmin Kim, Cheolhee Kim, James W Bowman, Seonghoon Kim, Keehyoung Joo, Jooyoung Lee, Kyeong Sik Jin, Yeon-Gil Kim, Nam Ki Lee, Jae U Jung, Byung-Ha Oh
Many bacteria, including Legionella pneumophila, rely on the type IV secretion system to translocate a repertoire of effector proteins into the hosts for their survival and growth. Type IV coupling protein (T4CP) is a hexameric ATPase that links translocating substrates to the transenvelope secretion conduit. Yet, how a large number of effector proteins are selectively recruited and processed by T4CPs remains enigmatic. DotL, the T4CP of L. pneumophila, contains an ATPase domain and a C-terminal extension whose function is unknown...
July 17, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28692019/bacteriophage-evolution-differs-by-host-lifestyle-and-genome
#3
Travis N Mavrich, Graham F Hatfull
Bacteriophages play key roles in microbial evolution(1,2), marine nutrient cycling(3) and human disease(4). Phages are genetically diverse, and their genome architectures are characteristically mosaic, driven by horizontal gene transfer with other phages and host genomes(5). As a consequence, phage evolution is complex and their genomes are composed of genes with distinct and varied evolutionary histories(6,7). However, there are conflicting perspectives on the roles of mosaicism and the extent to which it generates a spectrum of genome diversity(8) or genetically discrete populations(9,10)...
July 10, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28665414/etx2514-is-a-broad-spectrum-%C3%AE-lactamase-inhibitor-for-the-treatment-of-drug-resistant-gram-negative-bacteria-including-acinetobacter-baumannii
#4
Thomas F Durand-Réville, Satenig Guler, Janelle Comita-Prevoir, Brendan Chen, Neil Bifulco, Hoan Huynh, Sushmita Lahiri, Adam B Shapiro, Sarah M McLeod, Nicole M Carter, Samir H Moussa, Camilo Velez-Vega, Nelson B Olivier, Robert McLaughlin, Ning Gao, Jason Thresher, Tiffany Palmer, Beth Andrews, Robert A Giacobbe, Joseph V Newman, David E Ehmann, Boudewijn de Jonge, John O'Donnell, John P Mueller, Rubén A Tommasi, Alita A Miller
Multidrug-resistant (MDR) bacterial infections are a serious threat to public health. Among the most alarming resistance trends is the rapid rise in the number and diversity of β-lactamases, enzymes that inactivate β-lactams, a class of antibiotics that has been a therapeutic mainstay for decades. Although several new β-lactamase inhibitors have been approved or are in clinical trials, their spectra of activity do not address MDR pathogens such as Acinetobacter baumannii. This report describes the rational design and characterization of expanded-spectrum serine β-lactamase inhibitors that potently inhibit clinically relevant class A, C and D β-lactamases and penicillin-binding proteins, resulting in intrinsic antibacterial activity against Enterobacteriaceae and restoration of β-lactam activity in a broad range of MDR Gram-negative pathogens...
June 30, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28665409/structural-basis-for-human-respiratory-syncytial-virus-ns1-mediated-modulation-of-host-responses
#5
Srirupa Chatterjee, Priya Luthra, Ekaterina Esaulova, Eugene Agapov, Benjamin C Yen, Dominika M Borek, Megan R Edwards, Anuradha Mittal, David S Jordan, Parameshwar Ramanan, Martin L Moore, Rohit V Pappu, Michael J Holtzman, Maxim N Artyomov, Christopher F Basler, Gaya K Amarasinghe, Daisy W Leung
Human respiratory syncytial virus (hRSV) is a major cause of morbidity and mortality in the paediatric, elderly and immune-compromised populations(1,2). A gap in our understanding of hRSV disease pathology is the interplay between virally encoded immune antagonists and host components that limit hRSV replication. hRSV encodes for non-structural (NS) proteins that are important immune antagonists(3-6); however, the role of these proteins in viral pathogenesis is incompletely understood. Here, we report the crystal structure of hRSV NS1 protein, which suggests that NS1 is a structural paralogue of hRSV matrix (M) protein...
June 30, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28653684/host-response-inflammation-promotes-tb-growth
#6
Christina L Stallings
No abstract text is available yet for this article.
June 27, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28653683/vector-control-gets-new-impetus-and-direction
#7
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
June 27, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28653682/advocating-for-vaccination-in-a-climate-of-science-denial
#8
Cornelia Betsch
No abstract text is available yet for this article.
June 27, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28653681/metabolism-built-on-stable-catalysts
#9
Jens Nielsen
No abstract text is available yet for this article.
June 27, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28653680/fungal-pathogenesis-combatting-the-oxidative-burst
#10
Antonio Di Pietro, Nicholas J Talbot
No abstract text is available yet for this article.
June 27, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28650475/division-site-selection-linked-to-inherited-cell-surface-wave-troughs-in-mycobacteria
#11
Haig A Eskandarian, Pascal D Odermatt, Joëlle X Y Ven, Mélanie T M Hannebelle, Adrian P Nievergelt, Neeraj Dhar, John D McKinney, Georg E Fantner
Cell division is tightly controlled in space and time to maintain cell size and ploidy within narrow bounds. In bacteria, the canonical Minicell (Min) and nucleoid occlusion (Noc) systems together ensure that division is restricted to midcell after completion of chromosome segregation(1). It is unknown how division site selection is controlled in bacteria that lack homologues of the Min and Noc proteins, including mycobacteria responsible for tuberculosis and other chronic infections(2). Here, we use correlated optical and atomic-force microscopy(3,4) to demonstrate that morphological landmarks (waveform troughs) on the undulating surface of mycobacterial cells correspond to future sites of cell division...
June 26, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28650463/type-vi-secretion-tssk-baseplate-protein-exhibits-structural-similarity-with-phage-receptor-binding-proteins-and-evolved-to-bind-the-membrane-complex
#12
Van Son Nguyen, Laureen Logger, Silvia Spinelli, Pierre Legrand, Thi Thanh Huyen Pham, Thi Trang Nhung Trinh, Yassine Cherrak, Abdelrahim Zoued, Aline Desmyter, Eric Durand, Alain Roussel, Christine Kellenberger, Eric Cascales, Christian Cambillau
The type VI secretion system (T6SS) is a multiprotein machine widespread in Gram-negative bacteria that delivers toxins into both eukaryotic and prokaryotic cells. The mechanism of action of the T6SS is comparable to that of contractile myophages. The T6SS builds a tail-like structure made of an inner tube wrapped by a sheath, assembled under an extended conformation. Contraction of the sheath propels the inner tube towards the target cell. The T6SS tail is assembled on a platform-the baseplate-which is functionally similar to bacteriophage baseplates...
June 26, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28650444/nutrient-recycling-facilitates-long-term-stability-of-marine-microbial-phototroph-heterotroph-interactions
#13
Joseph A Christie-Oleza, Despoina Sousoni, Matthew Lloyd, Jean Armengaud, David J Scanlan
Biological interactions underpin the functioning of marine ecosystems, be it via competition, predation, mutualism or symbiosis processes. Microbial phototroph-heterotroph interactions propel the engine that results in the biogeochemical cycling of individual elements, and they are critical for understanding and modelling global ocean processes. Unfortunately, studies thus far have focused on exponentially growing cultures in nutrient-rich media, meaning knowledge of such interactions under in situ conditions is rudimentary at best...
June 26, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28650431/illuminating-vital-surface-molecules-of-symbionts-in-health-and-disease
#14
Jason E Hudak, David Alvarez, Ashwin Skelly, Ulrich H von Andrian, Dennis L Kasper
The immunomodulatory surface molecules of commensal and pathogenic bacteria are critical to microorganisms' survival and the host's response(1,2). Recent studies have highlighted the unique and important responses elicited by commensal-derived surface macromolecules(3-5). However, the technology available to track these molecules in host cells and tissues remains primitive. We report, here, an interdisciplinary approach that uses metabolic labelling combined with bioorthogonal click chemistry (that is, reactions performed in living organisms)(6) to specifically tag up to three prominent surface immunomodulatory macromolecules-peptidoglycan, lipopolysaccharide and capsular polysaccharide-either simultaneously or individually in live anaerobic commensal bacteria...
June 26, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28628133/hbv-rna-pre-genome-encodes-specific-motifs-that-mediate-interactions-with-the-viral-core-protein-that-promote-nucleocapsid-assembly
#15
Nikesh Patel, Simon J White, Rebecca F Thompson, Richard Bingham, Eva U Weiß, Daniel P Maskell, Adam Zlotnick, Eric Dykeman, Roman Tuma, Reidun Twarock, Neil A Ranson, Peter G Stockley
Formation of the hepatitis B virus nucleocapsid is an essential step in the viral lifecycle, but its assembly is not fully understood. We report the discovery of sequence-specific interactions between the viral pre-genome and the hepatitis B core protein that play roles in defining the nucleocapsid assembly pathway. Using RNA SELEX and bioinformatics, we identified multiple regions in the pre-genomic RNA with high affinity for core protein dimers. These RNAs form stem-loops with a conserved loop motif that trigger sequence-specific assembly of virus-like particles (VLPs) at much higher fidelity and yield than in the absence of RNA...
June 19, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28628099/toxoplasma-depends-on-lysosomal-consumption-of-autophagosomes-for-persistent-infection
#16
Manlio Di Cristina, Zhicheng Dou, Matteo Lunghi, Geetha Kannan, My-Hang Huynh, Olivia L McGovern, Tracey L Schultz, Aric J Schultz, Alyssa J Miller, Beth M Hayes, Wouter van der Linden, Carla Emiliani, Matthew Bogyo, Sébastien Besteiro, Isabelle Coppens, Vern B Carruthers
Globally, nearly 2 billion people are infected with the intracellular protozoan Toxoplasma gondii(1). This persistent infection can cause severe disease in immunocompromised people and is epidemiologically linked to major mental illnesses(2) and cognitive impairment(3). There are currently no options for curing this infection. The lack of effective therapeutics is due partly to a poor understanding of the essential pathways that maintain long-term infection. Although it is known that Toxoplasma replicates slowly within intracellular cysts demarcated with a cyst wall, precisely how it sustains itself and remodels organelles in this niche is unknown...
June 19, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28628098/short-chain-alkanes-fuel-mussel-and-sponge-cycloclasticus-symbionts-from-deep-sea-gas-and-oil-seeps
#17
Maxim Rubin-Blum, Chakkiath Paul Antony, Christian Borowski, Lizbeth Sayavedra, Thomas Pape, Heiko Sahling, Gerhard Bohrmann, Manuel Kleiner, Molly C Redmond, David L Valentine, Nicole Dubilier
Cycloclasticus bacteria are ubiquitous in oil-rich regions of the ocean and are known for their ability to degrade polycyclic aromatic hydrocarbons (PAHs). In this study, we describe Cycloclasticus that have established a symbiosis with Bathymodiolus heckerae mussels and poecilosclerid sponges from asphalt-rich, deep-sea oil seeps at Campeche Knolls in the southern Gulf of Mexico. Genomic and transcriptomic analyses revealed that, in contrast to all previously known Cycloclasticus, the symbiotic Cycloclasticus appears to lack the genes needed for PAH degradation...
June 19, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28604710/erratum-conserved-patterns-hidden-within-group-a-streptococcus-m-protein-hypervariability-recognize-human-c4b-binding-protein
#18
Cosmo Z Buffalo, Adrian J Bahn-Suh, Sophia P Hirakis, Tapan Biswas, Rommie E Amaro, Victor Nizet, Partho Ghosh
This corrects the article DOI: 10.1038/nmicrobiol.2016.155.
June 12, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28604700/excess-of-non-conservative-amino-acid-changes-in-marine-bacterioplankton-lineages-with-reduced-genomes
#19
Haiwei Luo, Yongjie Huang, Ramunas Stepanauskas, Jijun Tang
Surface ocean waters are dominated by planktonic bacterial lineages with highly reduced genomes. The best examples are the cyanobacterial genus Prochlorococcus, the alphaproteobacterial clade SAR11 and the gammaproteobacterial clade SAR86, which together represent over 50% of the cells in surface oceans. Several studies have identified signatures of selection on these lineages in today's ocean and have postulated selection as the primary force throughout their evolutionary history. However, massive loss of genomic DNA in these lineages often occurred in the distant past, and the selective pressures underlying these ancient events have not been assessed...
June 12, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28604679/a-stabilized-microbial-ecosystem-of-self-limiting-bacteria-using-synthetic-quorum-regulated-lysis
#20
Spencer R Scott, M Omar Din, Philip Bittihn, Liyang Xiong, Lev S Tsimring, Jeff Hasty
Microbial ecologists are increasingly turning to small, synthesized ecosystems(1-5) as a reductionist tool to probe the complexity of native microbiomes(6,7). Concurrently, synthetic biologists have gone from single-cell gene circuits(8-11) to controlling whole populations using intercellular signalling(12-16). The intersection of these fields is giving rise to new approaches in waste recycling(17), industrial fermentation(18), bioremediation(19) and human health(16,20). These applications share a common challenge(7) well-known in classical ecology(21,22)-stability of an ecosystem cannot arise without mechanisms that prohibit the faster-growing species from eliminating the slower...
June 12, 2017: Nature Microbiology
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