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| Open AccessUnravelling the immune signature of Plasmodium falciparum transmission-reducing immunity
Naturally acquired antibodies may inhibit Plasmodium survival in mosquitoes, alter malaria transmission dynamics, and form the basis for transmission-blocking vaccines. Here, using sera from malaria-exposed individuals, Stone et al. reveal novel antibody correlates of transmission-reducing activity.
- Will J. R. Stone
- , Joseph J. Campo
- & Matthijs M. Jore
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Article
| Open AccessSensory deprivation in Staphylococcus aureus
Bacteria use two-component systems (TCSs) to sense and respond to environmental changes. Here, the authors show that Staphylococcus aureus can survive in the absence of all its 16 TCSs under growth arrest conditions, and each TCS seems to be sufficient to sense and respond to specific environmental clues.
- Maite Villanueva
- , Begoña García
- & Iñigo Lasa
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Article
| Open AccessLegionella DotM structure reveals a role in effector recruiting to the Type 4B secretion system
Legionella pneumophila employs the Type 4B secretion system (T4BSS) to translocate more than 300 effector proteins into the host cell during infection. Here the authors present the crystal structure of the DotM soluble domain and give mechanistic insights into the recruitment of Glu-rich motif-containing effectors to the T4BSS.
- Amit Meir
- , David Chetrit
- & Gabriel Waksman
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Article
| Open AccessBiochemical mechanisms determine the functional compatibility of heterologous genes
Sequence composition is thought to be a major factor governing the functionality of horizontally transferred genes. In contrast, Porse et al. show that phylogenetic origin, and the type of resistance mechanism, are major factors affecting the functionality of horizontally transferred antibiotic resistance genes.
- Andreas Porse
- , Thea S. Schou
- & Morten O. A. Sommer
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Article
| Open AccessDiscordant congenital Zika syndrome twins show differential in vitro viral susceptibility of neural progenitor cells
Zika virus (ZIKV) infection can cause congenital Zika syndrome (CZS), but the underlying mechanisms are poorly understood. Here, the authors generate neural progenitor cells from dizygotic twins with a discordant phenotype regarding CZS and study their response to ZIKV infection.
- Luiz Carlos Caires-Júnior
- , Ernesto Goulart
- & Mayana Zatz
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Article
| Open AccessNucleotide resolution mapping of influenza A virus nucleoprotein-RNA interactions reveals RNA features required for replication
Influenza A virus packaging depends on interactions between nucleoprotein (NP) and viral RNA (vRNA), but the pattern of NP binding is unclear. Using PAR-CLIP, Williams et al. here show that NP binds vRNA non-uniformly and that RNA structures in low-NP binding regions are important for packaging.
- Graham D. Williams
- , Dana Townsend
- & Adrianus C. M. Boon
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Article
| Open AccessOvercoming mcr-1 mediated colistin resistance with colistin in combination with other antibiotics
The plasmid-borne mcr-1 gene confers resistance to the antibiotic colistin. Here, MacNair et al. show that mcr-1 positive bacteria are however susceptible to colistin-mediated disruption of the outer membrane, and can be killed in vitro and in vivo by combining colistin with other antibiotics.
- Craig R. MacNair
- , Jonathan M. Stokes
- & Eric D. Brown
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Article
| Open AccessStructure of tick-borne encephalitis virus and its neutralization by a monoclonal antibody
The tick-borne encephalitis virus (TBEV) causes thousands of cases of meningitis and encephalitis annually. Here, the authors describe a cryo-EM structure of the TBEV virion bound by Fab fragments of the neutralizing antibody 19/1786, revealing a mechanism whereby this antibody prevents virus membrane fusion.
- Tibor Füzik
- , Petra Formanová
- & Pavel Plevka
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Article
| Open AccessHTLV-1 Tax plugs and freezes UPF1 helicase leading to nonsense-mediated mRNA decay inhibition
UPF1 is a central protein in nonsense-mediated mRNA decay (NMD), but contribution of its RNA processivity to NMD is unclear. Here, the authors show how the retroviral Tax protein interacts with and inhibits UPF1, and demonstrate that UPF1’s translocase activity contributes to NMD.
- Francesca Fiorini
- , Jean-Philippe Robin
- & Vincent Mocquet
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Article
| Open AccessType IX secretion system PorM and gliding machinery GldM form arches spanning the periplasmic space
No structural data for the bacterial type IX secretion system (T9SS) are available so far. Here, the authors present the crystal structures of the periplasmic domains from two major T9SS components PorM and GldM, which span most of the periplasmic space, and propose a putative model of the T9SS core membrane complex.
- Philippe Leone
- , Jennifer Roche
- & Alain Roussel
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Article
| Open AccessBismuth antimicrobial drugs serve as broad-spectrum metallo-β-lactamase inhibitors
Metallo-β-lactamases (MBL) are zinc containing enzymes that cause resistance to β-lactam antibiotics. Here the authors show that the anti-Helicobacter pylori drug colloidal bismuth subcitrate inhibits MBLs by displacing the zinc ions with Bi(III), which is of great interest for the development of antibiotics.
- Runming Wang
- , Tsz-Pui Lai
- & Hongzhe Sun
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Article
| Open AccessAn evolutionary NS1 mutation enhances Zika virus evasion of host interferon induction
The Asian lineage of Zika virus (ZIKV) has acquired a mutation in NS1 that enhances mosquito infection. Here, Xia et al. show that the same mutation interferes with interferon production through interaction with TBK1 and affects ZIKV replication in mice.
- Hongjie Xia
- , Huanle Luo
- & Pei-Yong Shi
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Article
| Open AccessControl of primary metabolism by a virulence regulatory network promotes robustness in a plant pathogen
How pathogens maintain phenotypic robustness during infection is poorly understood. Here the authors couple the virulence regulatory network (VRN) of the pathogen R. solanacearum to a model of its metabolic network, and find that the VRN activates functionally redundant primary metabolism genes to promote phenotypic robustness during infection.
- Rémi Peyraud
- , Ludovic Cottret
- & Stéphane Genin
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Article
| Open AccessLipopolysaccharide O-antigen delays plant innate immune recognition of Xylella fastidiosa
Many pathogenic bacteria have evolved to subvert host immune responses triggered by lipopolysaccharides (LPS). Here the authors show that a long terminal polysaccharide chain, known as the O-antigen, present in LPS from the plant pathogen Xylella fastidiosa can delay recognition by grapevine hosts.
- Jeannette N. Rapicavoli
- , Barbara Blanco-Ulate
- & M. Caroline Roper
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Article
| Open AccessA global ocean atlas of eukaryotic genes
Marine microbial eukaryotes and zooplankton display enormous diversity and largely unexplored physiologies. Here, the authors use metatranscriptomics to analyze four organismal size fractions from open-ocean stations, providing the largest reference collection of eukaryotic transcripts from any single biome.
- Quentin Carradec
- , Eric Pelletier
- & Patrick Wincker
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Article
| Open AccessCrystal structure of lipid A disaccharide synthase LpxB from Escherichia coli
LpxB is a membrane-associated glycosyltransferase required for bacterial lipopolysaccharide biosynthesis. Here, Bohl et al. solve the crystal structure of a soluble LpxB variant, showing an intertwined C-terminally swapped dimer, and residues likely mediating association with lipidic substrates or the membrane.
- Heather O. Bohl
- , Ke Shi
- & Hideki Aihara
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Article
| Open AccessPhylogenomics and antimicrobial resistance of the leprosy bacillus Mycobacterium leprae
Leprosy is caused by the yet-uncultured pathogen Mycobacterium leprae. Here, Benjak et al. obtain M. leprae genome sequences from DNA extracted from patients' skin biopsies and, by analysing 154 genomes from 25 countries, provide insight into the pathogen’s evolution and antimicrobial resistance.
- Andrej Benjak
- , Charlotte Avanzi
- & Stewart T. Cole
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Article
| Open AccessShielding and activation of a viral membrane fusion protein
Viral fusion proteins undergo extensive conformational changes during entry but intermediate conformations often remain unknown. Here, the authors show how Gn of Rift Valley fever virus fusion protein shields hydrophobic fusion loops of Gc and how these loops embed in the target membrane at acidic conditions.
- Steinar Halldorsson
- , Sai Li
- & Juha T. Huiskonen
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Article
| Open AccessDouble-layered protein nanoparticles induce broad protection against divergent influenza A viruses
Relatively well conserved domains of influenza A virus (IAV) proteins are potential candidates for the development of a universal IAV vaccine. Here, Deng et al. combine two such conserved antigens (M2e and HA stalk) in a double-layered protein nanoparticle and show that it protects against divergent IAVs in mice.
- Lei Deng
- , Teena Mohan
- & Bao-Zhong Wang
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Article
| Open AccessFungal networks shape dynamics of bacterial dispersal and community assembly in cheese rind microbiomes
Interactions with other microbes may inhibit or facilitate the dispersal of bacteria. Here, Zhang et al. use cheese rind microbiomes as a model to show that physical networks created by filamentous fungi can affect the dispersal of motile bacteria and thus shape the diversity of microbial communities.
- Yuanchen Zhang
- , Erik K. Kastman
- & Benjamin E. Wolfe
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Article
| Open AccessSingle-cell genomics of multiple uncultured stramenopiles reveals underestimated functional diversity across oceans
The biology of many marine protists, such as stramenopiles, remains obscure. Here, the authors exploit single-cell genomics and metagenomics to analyze the genome content and apparent oceanic distribution of seven prevalent lineages of uncultured heterotrophic stramenopiles.
- Yoann Seeleuthner
- , Samuel Mondy
- & Patrick Wincker
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Article
| Open AccessZika virus infection in pregnant rhesus macaques causes placental dysfunction and immunopathology
Zika virus infection during pregnancy can result in birth defects, but underlying pathogenesis at the maternal-fetal interface is unclear. Here, the authors use non-invasive in vivo imaging of Zika-infected rhesus macaques and show that infection results in abnormal oxygen transport across the placenta.
- Alec J. Hirsch
- , Victoria H. J. Roberts
- & Daniel N. Streblow
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Article
| Open AccessThe deep-subsurface sulfate reducer Desulfotomaculum kuznetsovii employs two methanol-degrading pathways
Microorganisms metabolise methanol using either a methanol methyltransferase or a methanol dehydrogenase. Here, the authors use proteomics and stable isotope fractionation to show that a thermophilic sulfate-reducing bacterium, isolated from the deep subsurface, uses both pathways.
- Diana Z. Sousa
- , Michael Visser
- & Alfons J. M. Stams
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Article
| Open AccessStructural basis for chitin acquisition by marine Vibrio species
Chitin degrading bacteria are important for marine ecosystems. Here the authors structurally and functionally characterize the Vibrio harveyi outer membrane diffusion channel chitoporin and give mechanistic insights into chito-oligosaccharide uptake.
- Anuwat Aunkham
- , Michael Zahn
- & Bert van den Berg
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Article
| Open AccessMaturation of the gut microbiome and risk of asthma in childhood
Colonization of commensal bacteria is thought to impact immune development, especially in the earliest years of life. Here, the authors show, by analyzing the development of the gut microbiome of 690 children, that microbial composition at the age of 1 year is associated with asthma diagnosed in the first 5 years of life.
- Jakob Stokholm
- , Martin J. Blaser
- & Hans Bisgaard
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Article
| Open AccessThe evolution of substrate discrimination in macrolide antibiotic resistance enzymes
New antibiotics with reduced potential for resistance are urgently needed. Here, the authors use a multidisciplinary approach to characterize substrate discrimination in macrolide resistance kinases and present a strategy for the prediction of mutations that expand the substrate range of antibiotic-inactivating enzymes.
- Andrew C. Pawlowski
- , Peter J. Stogios
- & Gerard D. Wright
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Article
| Open AccessZika virus infection induces host inflammatory responses by facilitating NLRP3 inflammasome assembly and interleukin-1β secretion
The NLRP3 inflammasome plays an important role in antiviral host responses. Here, the authors reveal that the polymerase of Zika virus binds NLRP3 to facilitate inflammasome complex assembly and induce production of IL-1β in human macrophages, human PBMCs and mice, resulting in pathogenesis in mice.
- Wenbiao Wang
- , Geng Li
- & Jianguo Wu
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Article
| Open AccessHuman cytomegalovirus-encoded US9 targets MAVS and STING signaling to evade type I interferon immune responses
MAVS and STING signaling are central to interferon-inducing antiviral immunity. Here, the authors show how the human cytomegalovirus protein US9 can evade this immunity by antagonizing these pathways.
- Hyun jin Choi
- , Areum Park
- & Boyoun Park
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Article
| Open AccessMultiple entry pathways within the efflux transporter AcrB contribute to multidrug recognition
Multidrug transporters possess several drug binding sites. Here the authors describe a transport path specific for planar aromatic cations in the E. coli multi-drug transporter AcrB.
- Martijn Zwama
- , Seiji Yamasaki
- & Akihito Yamaguchi
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Article
| Open AccessMechanism and structural diversity of exoribonuclease-resistant RNA structures in flaviviral RNAs
Subgenomic flavivirus RNAs are generated by a host exoribonuclease and play an important role in virus replication and pathogenesis. Here, the authors show the mechanism by which subgenomic flavivirus RNAs are generated and identify two structurally distinct sfRNA classes in flaviviruses.
- Andrea MacFadden
- , Zoe O’Donoghue
- & Jeffrey S. Kieft
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Article
| Open AccessIncomplete prophage tolerance by type III-A CRISPR-Cas systems reduces the fitness of lysogenic hosts
CRISPR-Cas systems, such as type III-A CRISPR-Cas, provide an immune mechanism for prokaryotic hosts to resist parasites, including phages. Here, the authors show that maintenance of conditionally tolerant type III-A systems can affect the fitness of Staphylococcus aureus lysogens.
- Gregory W. Goldberg
- , Elizabeth A. McMillan
- & Luciano A. Marraffini
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Article
| Open AccessPhenotypic memory in Bacillus subtilis links dormancy entry and exit by a spore quantity-quality tradeoff
Bacillus subtilis withstands starvation by forming dormant spores that revive when nutrients become available. Here, Mutlu et al. show that sporulation timing controls spore revival through a phenotypic ‘memory’ that arises from the carry-over of a metabolic enzyme from the vegetative cell into the spore.
- Alper Mutlu
- , Stephanie Trauth
- & Ilka B. Bischofs
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Article
| Open AccessImportance of the 1+7 configuration of ribonucleoprotein complexes for influenza A virus genome packaging
Influenza A virus (IAV) packages its eight genomic RNA segments in a specific “1+7” pattern. Here, the authors generate IAV that lack one RNA segment and show that ribosomal RNA is packaged in place of the eighth segment, suggesting that the 1+7 pattern is important for particle production.
- Takeshi Noda
- , Shin Murakami
- & Yoshihiro Kawaoka
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Article
| Open AccessKSHV episomes reveal dynamic chromatin loop formation with domain-specific gene regulation
Genomic loops and their temporal dynamics play an important role in gene expression of DNA viruses, but are incompletely understood. Here, the authors use capture Hi-C analyses and identify genomic architectural dynamics of KSHV that are regulated by the viral transactivator K-Rta.
- Mel Campbell
- , Tadashi Watanabe
- & Yoshihiro Izumiya
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Article
| Open AccessHuman macrophages differentially produce specific resolvin or leukotriene signals that depend on bacterial pathogenicity
M1 and M2 cells are representative of proinflammatory versus resolving macrophages, respectively. Here the authors characterize the lipid mediator response to bacterial infection by these cells and show that differing panels of leukotrienes and specialized pro-resolving mediators contribute to control of the dichotomy.
- Oliver Werz
- , Jana Gerstmeier
- & Charles N. Serhan
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Article
| Open AccessSleeping sickness is a circadian disorder
African sleeping sickness is well known for the alterations of sleeping patterns, but it is not known how circadian biology is altered by the causative pathogen Trypanosoma brucei. Here the authors show T. brucei causes a disorder of the cellular circadian clock that is unrelated to the immune response to the parasite.
- Filipa Rijo-Ferreira
- , Tânia Carvalho
- & Joseph S. Takahashi
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Article
| Open AccessReplication-dependent size reduction precedes differentiation in Chlamydia trachomatis
The vegetative forms of chlamydiae (RBs) replicate within infected cells and then convert into infectious forms (EBs). Here, the authors use quantitative 3D electron microscopy and computer modeling to show that RB size decreases with replication, and conversion into EBs correlates with an RB size threshold.
- Jennifer K. Lee
- , Germán A. Enciso
- & Ming Tan
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Article
| Open AccessThe protease GtgE from Salmonella exclusively targets inactive Rab GTPases
The bacterial protease GtgE is involved in the establishment of Salmonellosis. Here the authors provide a structural and biochemical analysis of GtgE that sheds light on the molecular mechanisms of reprogramming infected host cells via site-specific proteolytic cleavage of the vesicular trafficking regulator Rab32.
- Rudolf Wachtel
- , Bastian Bräuning
- & Aymelt Itzen
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Article
| Open AccessExtreme sensitivity to ultraviolet light in the fungal pathogen causing white-nose syndrome of bats
White-nose syndrome, caused by the fungus Pseudogymnoascus destructans, is decimating North American bats. Here, Palmer et al. use comparative genomics to examine the evolutionary history of this pathogen, and show that it has lost a crucial DNA repair enzyme and is extremely sensitive to UV light.
- Jonathan M. Palmer
- , Kevin P. Drees
- & Daniel L. Lindner
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Article
| Open AccessStaphylococcus aureus produces pain through pore-forming toxins and neuronal TRPV1 that is silenced by QX-314
Bacterial infection can cause pain but the underlying mechanism is unclear. This study shows pain induced in mice by methicillin-resistant Staphylococcus aureus infection is mediated by bacterial pore-forming toxins, and a sodium channel blocker QX-314 can alleviate infection-associated pain.
- Kimbria J. Blake
- , Pankaj Baral
- & Isaac M. Chiu
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Article
| Open AccessCooperative interactions between seed-borne bacterial and air-borne fungal pathogens on rice
Interactions between bacteria and fungi are common and contribute to ecosystem processes. Here, Jung et al. show that the interaction between two plant pathogens (a seed-borne bacterium and an air-borne fungus) promotes their own survival and dispersal, as well as disease progression on rice plants.
- Boknam Jung
- , Jungwook Park
- & Jungkwan Lee
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Article
| Open AccessLinking soil biology and chemistry in biological soil crust using isolate exometabolomics
Metagenomic sequencing provides a window into microbial community structure and metabolic potential. Here, Swenson et al. integrate metabolomics and shotgun sequencing to functionally link microbial community structure with environmental chemistry in biological soil crust (biocrust).
- Tami L. Swenson
- , Ulas Karaoz
- & Trent R. Northen
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Article
| Open AccessProtein-inspired antibiotics active against vancomycin- and daptomycin-resistant bacteria
The antibiotic vancomycin inhibits bacterial cell wall synthesis by binding to a membrane-associated precursor. Here, Blaskovich et al. synthesize vancomycin derivatives containing lipophilic peptide moieties that enhance membrane affinity and in vivo activities against glycopeptide-resistant strains.
- Mark A. T. Blaskovich
- , Karl A. Hansford
- & Matthew A. Cooper
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Article
| Open AccessStrain profiling and epidemiology of bacterial species from metagenomic sequencing
Microbiota is often a complex mixture of multiple coexisting species and strains with high level of phenotypic and genomic variability. Here, Albanese and Donati develop StrainEst for estimating the number and identity of coexisting strains and their relative abundances in mixed metagenomic samples.
- Davide Albanese
- & Claudio Donati
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Article
| Open AccessStructure of a Wbl protein and implications for NO sensing by M. tuberculosis
Mycobacterium tuberculosis WhiB1 is a DNA-binding protein with a NO sensitive [4Fe-4S] cluster. Here the authors present the NMR structure of WhiB1 and suggest how loss of the iron-sulfur cluster through nitrosylation affects WhiB1 DNA binding and leads to transcriptional reprogramming.
- Bassam K. Kudhair
- , Andrea M. Hounslow
- & Jeffrey Green
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Article
| Open AccessLipid moieties on lipoproteins of commensal and non-commensal staphylococci induce differential immune responses
The Lpp lipoproteins of staphylococci trigger a TLR2-dependent immune response. Here, the authors show that commensal species (S. aureus, S. epidermidis) induce a less-intense TLR2 response than non-commensal species (S. carnosus) due to differential modification of the Lpp lipid moieties.
- Minh-Thu Nguyen
- , Julia Uebele
- & Friedrich Götz
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Article
| Open AccessA conserved ankyrin repeat-containing protein regulates conoid stability, motility and cell invasion in Toxoplasma gondii
Apicomplexan parasites such as Toxoplasma gondii possess a tubulin-rich structure called the conoid. Here, Long et al. identify a conoid protein that interacts with motor and structural proteins and is required for structural integrity of the conoid, parasite motility, and host cell invasion.
- Shaojun Long
- , Bryan Anthony
- & L. David Sibley
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Article
| Open AccessUnravelling the specificity and mechanism of sialic acid recognition by the gut symbiont Ruminococcus gnavus
The mucus layer is an important physical niche within the gut which harbours a distinct microbial community. Here the authors show that specific carbohydrate-binding modules associated with bacterial carbohydrate-active enzymes are mucus adhesins that target regions of the distal colon rich in sialomucins.
- C. David Owen
- , Louise E. Tailford
- & Nathalie Juge
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Article
| Open AccessHepatocytic expression of human sodium-taurocholate cotransporting polypeptide enables hepatitis B virus infection of macaques
Hepatitis B virus (HBV) has a limited host range and current animal models can only recapitulate certain aspects of HBV replication. Here, the authors show that expression of the HBV receptor NTCP in macaques supports HBV replication in vivo, suggesting this as animal model for future HBV studies.
- Benjamin J. Burwitz
- , Jochen M. Wettengel
- & Jonah B. Sacha
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