Preclinical Efficacy of Clumping Factor a in Prevention of Staphylococcus Aureus Infection
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The Role of Streptococcal and Staphylococcal Exotoxins and Proteases in Human Necrotizing Soft Tissue Infections
toxins Review The Role of Streptococcal and Staphylococcal Exotoxins and Proteases in Human Necrotizing Soft Tissue Infections Patience Shumba 1, Srikanth Mairpady Shambat 2 and Nikolai Siemens 1,* 1 Center for Functional Genomics of Microbes, Department of Molecular Genetics and Infection Biology, University of Greifswald, D-17489 Greifswald, Germany; [email protected] 2 Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, CH-8091 Zurich, Switzerland; [email protected] * Correspondence: [email protected]; Tel.: +49-3834-420-5711 Received: 20 May 2019; Accepted: 10 June 2019; Published: 11 June 2019 Abstract: Necrotizing soft tissue infections (NSTIs) are critical clinical conditions characterized by extensive necrosis of any layer of the soft tissue and systemic toxicity. Group A streptococci (GAS) and Staphylococcus aureus are two major pathogens associated with monomicrobial NSTIs. In the tissue environment, both Gram-positive bacteria secrete a variety of molecules, including pore-forming exotoxins, superantigens, and proteases with cytolytic and immunomodulatory functions. The present review summarizes the current knowledge about streptococcal and staphylococcal toxins in NSTIs with a special focus on their contribution to disease progression, tissue pathology, and immune evasion strategies. Keywords: Streptococcus pyogenes; group A streptococcus; Staphylococcus aureus; skin infections; necrotizing soft tissue infections; pore-forming toxins; superantigens; immunomodulatory proteases; immune responses Key Contribution: Group A streptococcal and Staphylococcus aureus toxins manipulate host physiological and immunological responses to promote disease severity and progression. 1. Introduction Necrotizing soft tissue infections (NSTIs) are rare and represent a more severe rapidly progressing form of soft tissue infections that account for significant morbidity and mortality [1]. -
Corynebacterium Diphtheriae Strains Correlates with the Predicted Membrane- Associated and Secreted Proteome Vartul Sangal1*, Jochen Blom2, Iain C
Sangal et al. BMC Genomics (2015) 16:765 DOI 10.1186/s12864-015-1980-8 RESEARCH ARTICLE Open Access Adherence and invasive properties of Corynebacterium diphtheriae strains correlates with the predicted membrane- associated and secreted proteome Vartul Sangal1*, Jochen Blom2, Iain C. Sutcliffe1, Christina von Hunolstein3, Andreas Burkovski4 and Paul A. Hoskisson5 Abstract Background: Non-toxigenic Corynebacterium diphtheriae strains are emerging as a major cause of severe pharyngitis and tonsillitis as well as invasive diseases such as endocarditis, septic arthritis, splenic abscesses and osteomyelitis. C. diphtheriae strains have been reported to vary in their ability to adhere and invade different cell lines. To identify the genetic basis of variation in the degrees of pathogenicity, we sequenced the genomes of four strains of C. diphtheriae (ISS 3319, ISS 4060, ISS 4746 and ISS 4749) that are well characterised in terms of their ability to adhere and invade mammalian cells. Results: Comparative analyses of 20 C. diphtheriae genome sequences, including 16 publicly available genomes, revealed a pan-genome comprising 3,989 protein coding sequences that include 1,625 core genes and 2,364 accessory genes. Most of the genomic variation between these strains relates to uncharacterised genes encoding hypothetical proteins or transposases. Further analyses of protein sequences using an array of bioinformatic tools predicted most of the accessory proteome to be located in the cytoplasm. The membrane-associated and secreted proteins are generally involved in adhesion and virulence characteristics. The genes encoding membrane-associated proteins, especially the number and organisation of the pilus gene clusters (spa) including the number of genes encoding surface proteins with LPXTG motifs differed between different strains. -
Host-Pathogen Interactions of Secreted and Surface Staphylococcus Aureus Factors
The Texas Medical Center Library DigitalCommons@TMC The University of Texas MD Anderson Cancer Center UTHealth Graduate School of The University of Texas MD Anderson Cancer Biomedical Sciences Dissertations and Theses Center UTHealth Graduate School of (Open Access) Biomedical Sciences 5-2010 Host-pathogen interactions of secreted and surface Staphylococcus aureus factors Vanessa Vazquez Follow this and additional works at: https://digitalcommons.library.tmc.edu/utgsbs_dissertations Part of the Biochemistry Commons, and the Microbiology Commons Recommended Citation Vazquez, Vanessa, "Host-pathogen interactions of secreted and surface Staphylococcus aureus factors" (2010). The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences Dissertations and Theses (Open Access). 25. https://digitalcommons.library.tmc.edu/utgsbs_dissertations/25 This Dissertation (PhD) is brought to you for free and open access by the The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences at DigitalCommons@TMC. It has been accepted for inclusion in The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences Dissertations and Theses (Open Access) by an authorized administrator of DigitalCommons@TMC. For more information, please contact [email protected]. Host-pathogen interactions of secreted and surface Staphylococcus aureus factors by Vanessa Vazquez, B.S. APPROVED: Supervisory Professor Magnus Höök, Ph.D. Burton Dickey, M.D. Theresa Koehler, Ph.D. C. Wayne Smith, M.D. Yi Xu, Ph.D. APPROVED: Dean, The University of Texas Health Science Center at Houston Graduate School of Biomedical Sciences HOST-PATHOGEN INTERACTIONS OF SECRETED AND SURFACE STAPHYLOCOCCUS AUREUS FACTORS A Dissertation Presented to the Faculty of The University of Texas Health Science Center at Houston and The University of Texas M.D. -
WO 2015/028850 Al 5 March 2015 (05.03.2015) P O P C T
(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2015/028850 Al 5 March 2015 (05.03.2015) P O P C T (51) International Patent Classification: AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, C07D 519/00 (2006.01) A61P 39/00 (2006.01) BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, C07D 487/04 (2006.01) A61P 35/00 (2006.01) DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, A61K 31/5517 (2006.01) A61P 37/00 (2006.01) HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KN, KP, KR, A61K 47/48 (2006.01) KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (21) International Application Number: OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, PCT/IB2013/058229 SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, (22) International Filing Date: TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, 2 September 2013 (02.09.2013) ZW. (25) Filing Language: English (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, (26) Publication Language: English GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, (71) Applicant: HANGZHOU DAC BIOTECH CO., LTD UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, [US/CN]; Room B2001-B2019, Building 2, No 452 Sixth TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, Street, Hangzhou Economy Development Area, Hangzhou EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, City, Zhejiang 310018 (CN). -
Fibrinogen Binding Sites P336 and Y338 of Clumping Factor a Are Crucial for Staphylococcus Aureus Virulence
Fibrinogen Binding Sites P336 and Y338 of Clumping Factor A Are Crucial for Staphylococcus aureus Virulence Elisabet Josefsson1*, Judy Higgins2, Timothy J. Foster2, Andrej Tarkowski1 1 Department of Rheumatology and Inflammation Research, University of Gothenburg, Go¨teborg, Sweden, 2 Microbiology Department, Moyne Institute of Preventive Medicine, Trinity College, Dublin, Ireland Abstract We have earlier shown that clumping factor A (ClfA), a fibrinogen binding surface protein of Staphylococcus aureus,isan important virulence factor in septic arthritis. When two amino acids in the ClfA molecule, P336 and Y338, were changed to serine and alanine, respectively, the fibrinogen binding property was lost. ClfAP336Y338 mutants have been constructed in two virulent S. aureus strains Newman and LS-1. The aim of this study was to analyze if these two amino acids which are vital for the fibrinogen binding of ClfA are of importance for the ability of S. aureus to generate disease. Septic arthritis or sepsis were induced in mice by intravenous inoculation of bacteria. The clfAP336Y338 mutant induced significantly less arthritis than the wild type strain, both with respect to severity and frequency. The mutant infected mice developed also a much milder systemic inflammation, measured as lower mortality, weight loss, bacterial growth in kidneys and lower IL-6 levels. The data were verified with a second mutant where clfAP336 and Y338 were changed to alanine and serine respectively. When sepsis was induced by a larger bacterial inoculum, the clfAP336Y338 mutants induced significantly less septic death. Importantly, immunization with the recombinant A domain of ClfAP336SY338A mutant but not with recombinant ClfA, protected against septic death. -
Report from the 26Th Meeting on Toxinology,“Bioengineering Of
toxins Meeting Report Report from the 26th Meeting on Toxinology, “Bioengineering of Toxins”, Organized by the French Society of Toxinology (SFET) and Held in Paris, France, 4–5 December 2019 Pascale Marchot 1,* , Sylvie Diochot 2, Michel R. Popoff 3 and Evelyne Benoit 4 1 Laboratoire ‘Architecture et Fonction des Macromolécules Biologiques’, CNRS/Aix-Marseille Université, Faculté des Sciences-Campus Luminy, 13288 Marseille CEDEX 09, France 2 Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, CNRS, Sophia Antipolis, 06550 Valbonne, France; [email protected] 3 Bacterial Toxins, Institut Pasteur, 75015 Paris, France; michel-robert.popoff@pasteur.fr 4 Service d’Ingénierie Moléculaire des Protéines (SIMOPRO), CEA de Saclay, Université Paris-Saclay, 91191 Gif-sur-Yvette, France; [email protected] * Correspondence: [email protected]; Tel.: +33-4-9182-5579 Received: 18 December 2019; Accepted: 27 December 2019; Published: 3 January 2020 1. Preface This 26th edition of the annual Meeting on Toxinology (RT26) of the SFET (http://sfet.asso.fr/ international) was held at the Institut Pasteur of Paris on 4–5 December 2019. The central theme selected for this meeting, “Bioengineering of Toxins”, gave rise to two thematic sessions: one on animal and plant toxins (one of our “core” themes), and a second one on bacterial toxins in honour of Dr. Michel R. Popoff (Institut Pasteur, Paris, France), both sessions being aimed at emphasizing the latest findings on their respective topics. Nine speakers from eight countries (Belgium, Denmark, France, Germany, Russia, Singapore, the United Kingdom, and the United States of America) were invited as international experts to present their work, and other researchers and students presented theirs through 23 shorter lectures and 27 posters. -
Modifications to the Harmonized Tariff Schedule of the United States To
U.S. International Trade Commission COMMISSIONERS Shara L. Aranoff, Chairman Daniel R. Pearson, Vice Chairman Deanna Tanner Okun Charlotte R. Lane Irving A. Williamson Dean A. Pinkert Address all communications to Secretary to the Commission United States International Trade Commission Washington, DC 20436 U.S. International Trade Commission Washington, DC 20436 www.usitc.gov Modifications to the Harmonized Tariff Schedule of the United States to Implement the Dominican Republic- Central America-United States Free Trade Agreement With Respect to Costa Rica Publication 4038 December 2008 (This page is intentionally blank) Pursuant to the letter of request from the United States Trade Representative of December 18, 2008, set forth in the Appendix hereto, and pursuant to section 1207(a) of the Omnibus Trade and Competitiveness Act, the Commission is publishing the following modifications to the Harmonized Tariff Schedule of the United States (HTS) to implement the Dominican Republic- Central America-United States Free Trade Agreement, as approved in the Dominican Republic-Central America- United States Free Trade Agreement Implementation Act, with respect to Costa Rica. (This page is intentionally blank) Annex I Effective with respect to goods that are entered, or withdrawn from warehouse for consumption, on or after January 1, 2009, the Harmonized Tariff Schedule of the United States (HTS) is modified as provided herein, with bracketed matter included to assist in the understanding of proclaimed modifications. The following supersedes matter now in the HTS. (1). General note 4 is modified as follows: (a). by deleting from subdivision (a) the following country from the enumeration of independent beneficiary developing countries: Costa Rica (b). -