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https://www.readbyqxmd.com/read/28217125/the-structure-and-function-of-the-gram-positive-bacterial-rna-degradosome
#1
REVIEW
Kyu Hong Cho
The RNA degradosome is a highly structured protein complex responsible for bulk RNA decay in bacteria. The main components of the complex, ribonucleases, an RNA helicase, and glycolytic enzymes are well-conserved in bacteria. Some components of the degradosome are essential for growth and the disruption of degradosome formation causes slower growth, indicating that this complex is required for proper cellular function. The study of the Escherichia coli degradosome has been performed extensively for the last several decades and has revealed detailed information on its structure and function...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28216292/evolutionary-constraints-shaping-streptococcus-pyogenes-host-interactions
#2
REVIEW
Reid V Wilkening, Michael J Federle
Research on the Gram-positive human-restricted pathogen Streptococcus pyogenes (Group A Streptococcus, GAS) has long focused on invasive illness, the most severe manifestations of GAS infection. Recent advances in descriptions of molecular mechanisms of GAS virulence, coupled with massive sequencing efforts to isolate genomes, have allowed the field to better understand the molecular and evolutionary changes leading to pandemic strains. These findings suggest that it is necessary to rethink the dogma involving GAS pathogenesis, and that the most productive avenues for research going forward may be investigations into GAS in its 'normal' habitat, the nasopharynx, and its ability to either live with its host in an asymptomatic lifestyle or as an agent of superficial infections...
February 16, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28214515/igg-degrading-enzyme-of-streptococcus-pyogenes-ides-prevents-disease-progression-and-facilitates-improvement-in-a-rabbit-model-of-guillain-barr%C3%A3-syndrome
#3
Yuzhong Wang, Qiguang Shi, Hui Lv, Ming Hu, Weifang Wang, Quanquan Wang, Baojun Qiao, Guorong Zhang, Zhanyun Lv, Christian Kjellman, Sofia Järnum, Lena Winstedt, Yong Zhang, Jiao Wen, Yanlei Hao, Nobuhiro Yuki
Autoantibodies binding to peripheral nerves followed by complement deposition and membrane attack complex formation results in nerve damage in Guillain-Barré syndrome (GBS). Strategies to remove the pathogenic autoantibodies or block the complement deposition benefit most patients with GBS. Immunoglobulin G-degrading enzyme of Streptococcus pyogenes (IdeS) is a cysteine protease which cleaves IgG antibodies into F(ab')2 and Fc fragments. In this study, using a rabbit model of axonal GBS, acute motor axonal neuropathy (AMAN), we demonstrated that IdeS treatment significantly reduced the disruption of Nav channels as well as activated C3 deposition at the anterior spinal root nodes of Ranvier in AMAN rabbits...
February 16, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28208036/streptococcus-pyogenes-pericarditis-in-a-healthy-adult-a-common-organism-in-an-uncommon-site
#4
Lauren C Giudicatti, Gar-Hing Lee, Claire Italiano, Nik Stoyanov
No abstract text is available yet for this article.
February 20, 2017: Medical Journal of Australia
https://www.readbyqxmd.com/read/28207813/interacting-networks-of-resistance-virulence-and-core-machinery-genes-identified-by-genome-wide-epistasis-analysis
#5
Marcin J Skwark, Nicholas J Croucher, Santeri Puranen, Claire Chewapreecha, Maiju Pesonen, Ying Ying Xu, Paul Turner, Simon R Harris, Stephen B Beres, James M Musser, Julian Parkhill, Stephen D Bentley, Erik Aurell, Jukka Corander
Recent advances in the scale and diversity of population genomic datasets for bacteria now provide the potential for genome-wide patterns of co-evolution to be studied at the resolution of individual bases. Here we describe a new statistical method, genomeDCA, which uses recent advances in computational structural biology to identify the polymorphic loci under the strongest co-evolutionary pressures. We apply genomeDCA to two large population data sets representing the major human pathogens Streptococcus pneumoniae (pneumococcus) and Streptococcus pyogenes (group A Streptococcus)...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28202898/engineering-a-lys-asn-isopeptide-bond-into-an-immunoglobulin-like-protein-domain-enhances-its-stability
#6
Hanna Kwon, Paul G Young, Christopher J Squire, Edward N Baker
The overall stability of globular protein structures is marginal, a balance between large numbers of stabilizing non-covalent interactions and a destabilizing entropic term. Higher stability can be engineered by introduction of disulfide bonds, provided the redox environment is controlled. The discovery of stabilizing isopeptide bond crosslinks, formed spontaneously between lysine and asparagine (or aspartic acid) side chains in certain bacterial cell-surface proteins suggests that such bonds could be introduced by protein engineering as an alternative protein stabilization strategy...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28201995/zoonotic-necrotizing-myositis-caused-by-streptococcus-equi-subsp-zooepidemicus-in-a-farmer
#7
Bård Reiakvam Kittang, Veronika Kuchařová Pettersen, Oddvar Oppegaard, Dag Harald Skutlaberg, Håvard Dale, Harald G Wiker, Steinar Skrede
BACKGROUND: Streptococcus equi subsp. zooepidemicus is a beta-hemolytic group C streptococcus mainly causing infections in domesticated animals. Here we describe the first case of zoonotic necrotizing myositis caused by this bacterium. CASE PRESENTATION: The patient was a 73-year-old, previously healthy farmer with two asymptomatic Shetland ponies in his stable. After close contact with the ponies while feeding them, he rapidly developed erythema of his left thigh and sepsis with multiple organ failure...
February 15, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28195163/targeted-gene-knock-in-by-crispr-cas-ribonucleoproteins-in-porcine-zygotes
#8
Ki-Eun Park, Anne Powell, Shelley E S Sandmaier, Chan-Mi Kim, Alan Mileham, David M Donovan, Bhanu P Telugu
The domestic pig is an important "dual purpose" animal model for agricultural and biomedical applications. There is an emerging consensus in the biomedical community for the use of large animal models such as pigs to either serve as an alternative, or complement investigations from the mouse. However, the use of pig has not proven popular due to technical difficulties and time required in generating models with desired genetic modifications. In this regard, the ability to directly modify the genome in the zygote and generate edited animals is highly desirable...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28191901/increasing-the-genome-targeting-scope-and-precision-of-base-editing-with-engineered-cas9-cytidine-deaminase-fusions
#9
Y Bill Kim, Alexis C Komor, Jonathan M Levy, Michael S Packer, Kevin T Zhao, David R Liu
Base editing induces single-nucleotide changes in the DNA of living cells using a fusion protein containing a catalytically defective Streptococcus pyogenes Cas9, a cytidine deaminase, and an inhibitor of base excision repair. This genome editing approach has the advantage that it does not require formation of double-stranded DNA breaks or provision of a donor DNA template. Here we report the development of five C to T (or G to A) base editors that use natural and engineered Cas9 variants with different protospacer-adjacent motif (PAM) specificities to expand the number of sites that can be targeted by base editing 2...
February 13, 2017: Nature Biotechnology
https://www.readbyqxmd.com/read/28183813/targeted-proteomics-and-absolute-protein-quantification-for-the-construction-of-a-stoichiometric-host-pathogen-surface-density-model
#10
Kristoffer Sjöholm, Ola Kilsgård, Johan Teleman, Lotta Happonen, Lars Malmström, Johan Malmström
Sepsis is a systemic immune response responsible for considerable morbidity and mortality. Molecular modelling of host-pathogen interactions in the disease state represents a promising strategy to define molecular events of importance for the transition from superficial to invasive infectious diseases. Here we used the gram-positive bacterium Streptococcus pyogenes as a model system to establish a mass spectrometry based workflow for the construction of a stoichiometric surface density model between the S. pyogenes surface, the surface virulence factor M-protein, and adhered human blood plasma proteins...
February 9, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28165460/programmable-transcriptional-repression-in-mycobacteria-using-an-orthogonal-crispr-interference-platform
#11
Jeremy M Rock, Forrest F Hopkins, Alejandro Chavez, Marieme Diallo, Michael R Chase, Elias R Gerrick, Justin R Pritchard, George M Church, Eric J Rubin, Christopher M Sassetti, Dirk Schnappinger, Sarah M Fortune
The development of new drug regimens that allow rapid, sterilizing treatment of tuberculosis has been limited by the complexity and time required for genetic manipulations in Mycobacterium tuberculosis. CRISPR interference (CRISPRi) promises to be a robust, easily engineered and scalable platform for regulated gene silencing. However, in M. tuberculosis, the existing Streptococcus pyogenes Cas9-based CRISPRi system is of limited utility because of relatively poor knockdown efficiency and proteotoxicity. To address these limitations, we screened eleven diverse Cas9 orthologues and identified four that are broadly functional for targeted gene knockdown in mycobacteria...
February 6, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28161292/a-case-of-descending-mediastinitis-caused-by-streptococcus-pyogenes-harboring-genotype-emm25-and-sequence-type-660
#12
Hiroaki Ohya, Nobuaki Mori, Tetsuro Hayashi, Shujiro Minami, Akiko Higuchi, Takashi Takahashi
Descending mediastinitis caused by Streptococcus pyogenes (group A streptococcus, GAS) is rare among cases of invasive GAS infection. In this report, we describe a case of a cervical abscess and secondary descending mediastinitis in a previously healthy 39-year-old Japanese man. The patient presented with a 2-week history of a sore throat, and subsequently developed an abscess and descending mediastinitis. We treated the cervical abscess using ampicillin/sulbactam and drainage, and GAS was subsequently isolated in two blood cultures from the patient's admission...
February 1, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28159446/in-vitro-activity-of-oritavancin-against-gram-positive-pathogens-isolated-in-canadian-hospital-laboratories-from-2011-to-2015
#13
James A Karlowsky, Andrew J Walkty, Melanie R Baxter, Francis F Arhin, Gregory Moeck, Heather J Adam, George G Zhanel
Gram-positive bacterial pathogens isolated from patient specimens submitted to 15 Canadian hospital laboratories from 2011 to 2015 were tested in the coordinating laboratory for susceptibility to oritavancin and comparative antimicrobial agents using the Clinical and Laboratory Standards Institute M07-A10 (2015) broth microdilution method. Oritavancin's in vitro activity was equivalent to, or more potent than, vancomycin, daptomycin, linezolid, and tigecycline against methicillin-susceptible Staphylococcus aureus (n=2680; oritavancin MIC90, 0...
January 20, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28154192/streptococcus-pyogenes-endopeptidase-o-contributes-to-evasion-from-complement-mediated-bacteriolysis-via-binding-to-human-complement-factor-c1q
#14
Mariko Honda-Ogawa, Tomoko Sumitomo, Yasushi Mori, Dalia Talat Hamd, Taiji Ogawa, Masaya Yamaguchi, Masanobu Nakata, Shigetada Kawabata
Streptococcus pyogenes secrets various virulence factors for evasion from complement-mediated bacteriolysis. However, full understanding of the molecules possessed by this organism that interact with complement C1q, an initiator of the classical complement pathway, remains elusive. In this study, we identified an endopeptidase of S. pyogenes, PepO, as an interacting molecule, and investigated its effects on complement immunity and pathogenesis. Enzyme-linked immunosorbent assay and surface plasmon resonance analysis findings revealed that S...
January 30, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28148989/nano-au-cmwcnt-modified-speb-gene-specific-amperometric-sensor-for-rapidly-detecting-streptococcus-pyogenes-causing-rheumatic-heart-disease
#15
Ankur Kaushal, Swati Singh, Ashok Kumar, Dinesh Kumar
A specific 5' NH2 labeled DNA probe of speB gene was immobilized onto the gold nanoparticles/carboxylated multi walled carbon nanotubes (Nano-Au/cMWCNT) screen printed electrode using EDC/NHS cross linking chemistry. This was followed by hybridization with 0.5-50 ng/6 µl of single stranded genomic DNA Streptococcus pyogenes infected patient throat swab samples. Electrochemical amperometric assay was deciphered by using cyclic voltammetry (CV) with methylene blue a redox indicator. The sensor had a sensitivity of 104...
March 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28146590/epidemiology-of-otitis-media-with-spontaneous-perforation-of-the-tympanic-membrane-in-young-children-and-association-with-bacterial-nasopharyngeal-carriage-recurrences-and-pneumococcal-vaccination-in-catalonia-spain-the-prospective-hermes-study
#16
Robert Cilveti, Montserrat Olmo, Josefa Pérez-Jove, Juan-José Picazo, Josep-Lluis Arimany, Emiliano Mora, Tomás M Pérez-Porcuna, Ignacio Aguilar, Aurora Alonso, Francesc Molina, María Del Amo, Cristina Mendez
The Epidemiology of otitis media with spontaneous perforation of the tympanic membrane and associated nasopharyngeal carriage of bacterial otopathogens was analysed in a county in Catalonia (Spain) with pneumococcal conjugate vaccines (PCVs) not included in the immunization programme at study time. A prospective, multicentre study was performed in 10 primary care centres and 2 hospitals (June 2011-June 2014), including all otherwise healthy children ≥2 months ≤8 years with otitis media presenting spontaneous tympanic perforation within 48h...
2017: PloS One
https://www.readbyqxmd.com/read/28146359/efficient-genome-editing-of-a-facultative-thermophile-using-the-mesophilic-spcas9
#17
Ioannis Mougiakos, Elleke Fenna Bosma, Koen Weenink, Eric Michael Vossen, Kirsten Goijvaerts, John Van Der Oost, Richard van Kranenburg
Well-developed genetic tools for thermophilic microorganisms are scarce, despite their industrial and scientific relevance. Whereas highly efficient CRISPR-Cas9-based genome editing is on the rise in prokaryotes, it has never been employed in a thermophile. Here, we apply Streptococcus pyogenes Cas9 (spCas9)-based genome editing to a moderate thermophile, i.e. Bacillus smithii, including a gene deletion, gene knock-out via insertion of premature stop codons, and gene insertion. We show that spCas9 is inactive in vivo above 42°C and we employ the wide temperature growth range of B...
February 1, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28140746/cas9-cpf1-and-c2c1-2-3-what-s-next
#18
Shota Nakade, Takashi Yamamoto, Tetsushi Sakuma
Since the rapid emergence of clustered regulatory interspaced short palindromic repeats (CRISPR)-CRISPR-associated protein 9 (Cas9) system, developed as a genome engineering tool in 2012-2013, most researchers in the life science field have had a fixated interest in this fascinating technology. CRISPR-Cas9 is an RNA-guided DNA endonuclease system, which consists of Cas9 nuclease defining a few targeting base via protospacer adjacent motif complexed with easily customizable single guide RNA targeting around 20-bp genomic sequence...
January 31, 2017: Bioengineered
https://www.readbyqxmd.com/read/28138013/hyaluronan-synthase-assembles-hyaluronan-on-a-glcnac-%C3%AE-1-4-n-glcnac-%C3%AE-1%C3%A2-udp-primer-and-hyaluronan-retains-this-residual-chitin-oligomer-as-a-cap-at-the-nonreducing-end
#19
Paul H Weigel, Bruce A Baggenstoss, Jennifer L Washburn
Class I hyaluronan synthases (HAS) assemble [GlcNAc(β1,4)GlcUA(β1,3)]n-UDP at the reducing end and also make chitin. Streptococcus equisimilis HAS (SeHAS) also synthesizes chitin-UDP oligosaccharides, (GlcNAc-β1,4)n-GlcNAc(α1→)UDP (Weigel et al Glycobiol. 25, 632-643, 2015). Here we determined if HAS uses chitin-UDPs as primers to initiate HA synthesis, leaving the non-HA primer at the nonreducing (NR) end. HA made by SeHAS membranes was purified, digested with streptomyces lyase, and hydrophobic oligomers were enriched by solid phase extraction and analyzed by MALDI-TOF MS...
January 30, 2017: Glycobiology
https://www.readbyqxmd.com/read/28129822/-antimicrobial-spectrum-of-dalbavancin-mechanism-of-action-and-in-vitro-activity-against-gram-positive-microorganisms
#20
Emilia Cercenado
Because of the increase in bacterial resistance, there is a need for new antimicrobial agents. Dalbavancin is a semisynthetic glycopeptide that inhibits the late stages of bacterial cell wall synthesis in the same way as vancomycin, but in addition, its lipophilic side chain anchors dalbavancin to the cellular membrane and allows enhanced activity compared with that of vancomycin. Dalbavancin possesses a broad spectrum of in vitro activity against Gram-positive aerobic and anaerobic microorganisms, being 4-8 times more potent than vancomycin...
January 2017: Enfermedades Infecciosas y Microbiología Clínica
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