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The Food Poisoning Toxins of Bacillus Cereus
toxins Review The Food Poisoning Toxins of Bacillus cereus Richard Dietrich 1,†, Nadja Jessberger 1,*,†, Monika Ehling-Schulz 2 , Erwin Märtlbauer 1 and Per Einar Granum 3 1 Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig Maximilian University of Munich, Schönleutnerstr. 8, 85764 Oberschleißheim, Germany; [email protected] (R.D.); [email protected] (E.M.) 2 Department of Pathobiology, Functional Microbiology, Institute of Microbiology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria; [email protected] 3 Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, P.O. Box 5003 NMBU, 1432 Ås, Norway; [email protected] * Correspondence: [email protected] † These authors have contributed equally to this work. Abstract: Bacillus cereus is a ubiquitous soil bacterium responsible for two types of food-associated gastrointestinal diseases. While the emetic type, a food intoxication, manifests in nausea and vomiting, food infections with enteropathogenic strains cause diarrhea and abdominal pain. Causative toxins are the cyclic dodecadepsipeptide cereulide, and the proteinaceous enterotoxins hemolysin BL (Hbl), nonhemolytic enterotoxin (Nhe) and cytotoxin K (CytK), respectively. This review covers the current knowledge on distribution and genetic organization of the toxin genes, as well as mechanisms of enterotoxin gene regulation and toxin secretion. In this context, the exceptionally high variability of toxin production between single strains is highlighted. In addition, the mode of action of the pore-forming enterotoxins and their effect on target cells is described in detail. The main focus of this review are the two tripartite enterotoxin complexes Hbl and Nhe, but the latest findings on cereulide and CytK are also presented, as well as methods for toxin detection, and the contribution of further putative virulence factors to the diarrheal disease. -
The Influence of Probiotics on the Firmicutes/Bacteroidetes Ratio In
microorganisms Review The Influence of Probiotics on the Firmicutes/Bacteroidetes Ratio in the Treatment of Obesity and Inflammatory Bowel disease Spase Stojanov 1,2, Aleš Berlec 1,2 and Borut Štrukelj 1,2,* 1 Faculty of Pharmacy, University of Ljubljana, SI-1000 Ljubljana, Slovenia; [email protected] (S.S.); [email protected] (A.B.) 2 Department of Biotechnology, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia * Correspondence: borut.strukelj@ffa.uni-lj.si Received: 16 September 2020; Accepted: 31 October 2020; Published: 1 November 2020 Abstract: The two most important bacterial phyla in the gastrointestinal tract, Firmicutes and Bacteroidetes, have gained much attention in recent years. The Firmicutes/Bacteroidetes (F/B) ratio is widely accepted to have an important influence in maintaining normal intestinal homeostasis. Increased or decreased F/B ratio is regarded as dysbiosis, whereby the former is usually observed with obesity, and the latter with inflammatory bowel disease (IBD). Probiotics as live microorganisms can confer health benefits to the host when administered in adequate amounts. There is considerable evidence of their nutritional and immunosuppressive properties including reports that elucidate the association of probiotics with the F/B ratio, obesity, and IBD. Orally administered probiotics can contribute to the restoration of dysbiotic microbiota and to the prevention of obesity or IBD. However, as the effects of different probiotics on the F/B ratio differ, selecting the appropriate species or mixture is crucial. The most commonly tested probiotics for modifying the F/B ratio and treating obesity and IBD are from the genus Lactobacillus. In this paper, we review the effects of probiotics on the F/B ratio that lead to weight loss or immunosuppression. -
Phylogenetic Analysis Reveals an Ancient Gene Duplication As The
1 Phylogenetic analysis reveals an ancient gene duplication as 2 the origin of the MdtABC efflux pump. 3 4 Kamil Górecki1, Megan M. McEvoy1,2,3 5 1Institute for Society & Genetics, 2Department of MicroBiology, Immunology & Molecular 6 Genetics, and 3Molecular Biology Institute, University of California, Los Angeles, CA 90095, 7 United States of America 8 Corresponding author: [email protected] (M.M.M.) 9 1 10 Abstract 11 The efflux pumps from the Resistance-Nodulation-Division family, RND, are main 12 contributors to intrinsic antibiotic resistance in Gram-negative bacteria. Among this family, the 13 MdtABC pump is unusual by having two inner membrane components. The two components, 14 MdtB and MdtC are homologs, therefore it is evident that the two components arose by gene 15 duplication. In this paper, we describe the results obtained from a phylogenetic analysis of the 16 MdtBC pumps in the context of other RNDs. We show that the individual inner membrane 17 components (MdtB and MdtC) are conserved throughout the Proteobacterial species and that their 18 existence is a result of a single gene duplication. We argue that this gene duplication was an ancient 19 event which occurred before the split of Proteobacteria into Alpha-, Beta- and Gamma- classes. 20 Moreover, we find that the MdtABC pumps and the MexMN pump from Pseudomonas aeruginosa 21 share a close common ancestor, suggesting the MexMN pump arose by another gene duplication 22 event of the original Mdt ancestor. Taken together, these results shed light on the evolution of the 23 RND efflux pumps and demonstrate the ancient origin of the Mdt pumps and suggest that the core 24 bacterial efflux pump repertoires have been generally stable throughout the course of evolution. -
Biofilm Formation and Cellulose Expression by Bordetella Avium 197N, the Causative Agent of Bordetellosis in Birds and an Opportunistic Respiratory Pathogen in Humans
Accepted Manuscript Biofilm formation and cellulose expression by Bordetella avium 197N, the causative agent of bordetellosis in birds and an opportunistic respiratory pathogen in humans Kimberley McLaughlin, Ayorinde O. Folorunso, Yusuf Y. Deeni, Dona Foster, Oksana Gorbatiuk, Simona M. Hapca, Corinna Immoor, Anna Koza, Ibrahim U. Mohammed, Olena Moshynets, Sergii Rogalsky, Kamil Zawadzki, Andrew J. Spiers PII: S0923-2508(17)30017-7 DOI: 10.1016/j.resmic.2017.01.002 Reference: RESMIC 3563 To appear in: Research in Microbiology Received Date: 17 November 2016 Revised Date: 16 January 2017 Accepted Date: 16 January 2017 Please cite this article as: K. McLaughlin, A.O. Folorunso, Y.Y. Deeni, D. Foster, O. Gorbatiuk, S.M. Hapca, C. Immoor, A. Koza, I.U. Mohammed, O. Moshynets, S. Rogalsky, K. Zawadzki, A.J. Spiers, Biofilm formation and cellulose expression by Bordetella avium 197N, the causative agent of bordetellosis in birds and an opportunistic respiratory pathogen in humans, Research in Microbiologoy (2017), doi: 10.1016/j.resmic.2017.01.002. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Page 1 of 25 ACCEPTED MANUSCRIPT 1 For Publication 2 Biofilm formation and cellulose expression by Bordetella avium 197N, 3 the causative agent of bordetellosis in birds and an opportunistic 4 respiratory pathogen in humans 5 a* a*** a b 6 Kimberley McLaughlin , Ayorinde O. -
Genomic Stability and Genetic Defense Systems in Dolosigranulum Pigrum A
bioRxiv preprint doi: https://doi.org/10.1101/2021.04.16.440249; this version posted April 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Genomic Stability and Genetic Defense Systems in Dolosigranulum pigrum a 2 Candidate Beneficial Bacterium from the Human Microbiome 3 4 Stephany Flores Ramosa, Silvio D. Bruggera,b,c, Isabel Fernandez Escapaa,c,d, Chelsey A. 5 Skeetea, Sean L. Cottona, Sara M. Eslamia, Wei Gaoa,c, Lindsey Bomara,c, Tommy H. 6 Trand, Dakota S. Jonese, Samuel Minote, Richard J. Robertsf, Christopher D. 7 Johnstona,c,e#, Katherine P. Lemona,d,g,h# 8 9 aThe Forsyth Institute (Microbiology), Cambridge, MA, USA 10 bDepartment of Infectious Diseases and Hospital Epidemiology, University Hospital 11 Zurich, University of Zurich, Zurich, Switzerland 12 cDepartment of Oral Medicine, Infection and Immunity, Harvard School of Dental 13 Medicine, Boston, MA, USA 14 dAlkek Center for Metagenomics & Microbiome Research, Department of Molecular 15 Virology & Microbiology, Baylor College of Medicine, Houston, Texas, USA 16 eVaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, 17 Seattle, WA, USA 18 fNew England Biolabs, Ipswich, MA, USA 19 gDivision of Infectious Diseases, Boston Children’s Hospital, Harvard Medical School, 20 Boston, MA, USA 21 hSection of Infectious Diseases, Texas Children’s Hospital, Department of Pediatrics, 22 Baylor College of Medicine, Houston, Texas, USA 23 bioRxiv preprint doi: https://doi.org/10.1101/2021.04.16.440249; this version posted April 18, 2021. -
The Microbiome of Otitis Media with Effusion and the Influence of Alloiococcus Otitidis on Haemophilus Influenzae in Polymicrobial Biofilm
The microbiome of otitis media with effusion and the influence of Alloiococcus otitidis on Haemophilus influenzae in polymicrobial biofilm Chun L Chan Bachelor of Radiography and Medical Imaging (Honours) Bachelor of Medicine, Bachelor of Surgery Department of Otolaryngology, Head and Neck Surgery University of Adelaide, Adelaide, Australia Submitted for the title of Doctor of Philosophy November 2016 C L Chan i This thesis is dedicated to those who have sacrificed the most during my scientific endeavours My amazing family Flora, Aidan and Benjamin C L Chan ii Table of Contents TABLE OF CONTENTS .............................................................................................................................. III THESIS DECLARATION ............................................................................................................................. VII ACKNOWLEDGEMENTS ........................................................................................................................... VIII THESIS SUMMARY ................................................................................................................................... X PUBLICATIONS ARISING FROM THIS THESIS .................................................................................................. XII PRESENTATIONS ARISING FROM THIS THESIS ............................................................................................... XIII ABBREVIATIONS ................................................................................................................................... -
High Quality Permanent Draft Genome Sequence of Chryseobacterium Bovis DSM 19482T, Isolated from Raw Cow Milk
Lawrence Berkeley National Laboratory Recent Work Title High quality permanent draft genome sequence of Chryseobacterium bovis DSM 19482T, isolated from raw cow milk. Permalink https://escholarship.org/uc/item/4b48v7v8 Journal Standards in genomic sciences, 12(1) ISSN 1944-3277 Authors Laviad-Shitrit, Sivan Göker, Markus Huntemann, Marcel et al. Publication Date 2017 DOI 10.1186/s40793-017-0242-6 Peer reviewed eScholarship.org Powered by the California Digital Library University of California Laviad-Shitrit et al. Standards in Genomic Sciences (2017) 12:31 DOI 10.1186/s40793-017-0242-6 SHORT GENOME REPORT Open Access High quality permanent draft genome sequence of Chryseobacterium bovis DSM 19482T, isolated from raw cow milk Sivan Laviad-Shitrit1, Markus Göker2, Marcel Huntemann3, Alicia Clum3, Manoj Pillay3, Krishnaveni Palaniappan3, Neha Varghese3, Natalia Mikhailova3, Dimitrios Stamatis3, T. B. K. Reddy3, Chris Daum3, Nicole Shapiro3, Victor Markowitz3, Natalia Ivanova3, Tanja Woyke3, Hans-Peter Klenk4, Nikos C. Kyrpides3 and Malka Halpern1,5* Abstract Chryseobacterium bovis DSM 19482T (Hantsis-Zacharov et al., Int J Syst Evol Microbiol 58:1024-1028, 2008) is a Gram-negative, rod shaped, non-motile, facultative anaerobe, chemoorganotroph bacterium. C. bovis is a member of the Flavobacteriaceae, a family within the phylum Bacteroidetes. It was isolated when psychrotolerant bacterial communities in raw milk and their proteolytic and lipolytic traits were studied. Here we describe the features of this organism, together with the draft genome sequence and annotation. The DNA G + C content is 38.19%. The chromosome length is 3,346,045 bp. It encodes 3236 proteins and 105 RNA genes. The C. bovis genome is part of the Genomic Encyclopedia of Type Strains, Phase I: the one thousand microbial genomes study. -
Identification of Pasteurella Species and Morphologically Similar Organisms
UK Standards for Microbiology Investigations Identification of Pasteurella species and Morphologically Similar Organisms Issued by the Standards Unit, Microbiology Services, PHE Bacteriology – Identification | ID 13 | Issue no: 3 | Issue date: 04.02.15 | Page: 1 of 28 © Crown copyright 2015 Identification of Pasteurella species and Morphologically Similar Organisms Acknowledgments UK Standards for Microbiology Investigations (SMIs) are developed under the auspices of Public Health England (PHE) working in partnership with the National Health Service (NHS), Public Health Wales and with the professional organisations whose logos are displayed below and listed on the website https://www.gov.uk/uk- standards-for-microbiology-investigations-smi-quality-and-consistency-in-clinical- laboratories. SMIs are developed, reviewed and revised by various working groups which are overseen by a steering committee (see https://www.gov.uk/government/groups/standards-for-microbiology-investigations- steering-committee). The contributions of many individuals in clinical, specialist and reference laboratories who have provided information and comments during the development of this document are acknowledged. We are grateful to the Medical Editors for editing the medical content. For further information please contact us at: Standards Unit Microbiology Services Public Health England 61 Colindale Avenue London NW9 5EQ E-mail: [email protected] Website: https://www.gov.uk/uk-standards-for-microbiology-investigations-smi-quality- and-consistency-in-clinical-laboratories UK Standards for Microbiology Investigations are produced in association with: Logos correct at time of publishing. Bacteriology – Identification | ID 13 | Issue no: 3 | Issue date: 04.02.15 | Page: 2 of 28 UK Standards for Microbiology Investigations | Issued by the Standards Unit, Public Health England Identification of Pasteurella species and Morphologically Similar Organisms Contents ACKNOWLEDGMENTS ......................................................................................................... -
Microbial Biofilms – Veronica Lazar and Eugenia Bezirtzoglou
MEDICAL SCIENCES – Microbial Biofilms – Veronica Lazar and Eugenia Bezirtzoglou MICROBIAL BIOFILMS Veronica Lazar University of Bucharest, Faculty of Biology, Dept. of Microbiology, 060101 Aleea Portocalelor No. 1-3, Sector 6, Bucharest, Romania; Eugenia Bezirtzoglou Democritus University of Thrace - Faculty of Agricultural Development, Dept. of Microbiology, Orestiada, Greece Keywords: Microbial adherence to cellular/inert substrata, Biofilms, Intercellular communication, Quorum Sensing (QS) mechanism, Dental plaque, Tolerance to antimicrobials, Anti-biofilm strategies, Ecological and biotechnological significance of biofilms Contents 1. Introduction 2. Definition 3. Microbial Adherence 4. Development, Architecture of a Mature Biofilm and Properties 5. Intercellular Communication: Intra-, Interspecific and Interkingdom Signaling, By QS Mechanism and Implications 6. Medical Significance of Microbial Biofilms Formed on Cellular Substrata and Medical Devices 6.1. Microbial Biofilms on Medical Devices 6.2. Microorganisms - Biomaterial Interactions 6.3. Phenotypical Resistance or Tolerance to Antimicrobials; Mechanisms of Tolerance 7. New Strategies for Prevention and Treatment of Biofilm Associated Infections 8. Ecological Significance 9. Biotechnological / Industrial Applications 10. Conclusion Acknowledgments Glossary Bibliography Biographical Sketches UNESCO – EOLSS Summary A biofilm is a sessileSAMPLE microbial community coCHAPTERSmposed of cells embedded in a matrix of exopolysaccharide matrix attached to a substratum or interface. Biofilms -
Microbiological, Lipid and Immunological Profiles in Children
Original Article http://dx.doi.org/10.1590/1678-77572016-0196 Microbiological, lipid and immunological SUR¿OHVLQFKLOGUHQZLWKJLQJLYLWLVDQG type 1 diabetes mellitus Abstract Cristiane DUQUE1 Objective: The aim of this study was to compare the prevalence of SHULRGRQWDOSDWKRJHQVV\VWHPLFLQÀDPPDWRU\PHGLDWRUVDQGOLSLGSUR¿OHVLQ Mariana Ferreira Dib JOÃO2 type 1 diabetes children (DM) with those observed in children without diabetes Gabriela Alessandra da Cruz (NDM), both with gingivitis. Material and methods: Twenty-four DM children Galhardo CAMARGO3 and twenty-seven NDM controls were evaluated. The periodontal status, 3 Gláucia Schuindt TEIXEIRA JO\FHPLF DQG OLSLG SUR¿OHV ZHUH GHWHUPLQHG IRU ERWK JURXSV 6XEJLQJLYDO Thamiris Santana MACHADO3 samples of periodontal sites were collected to determine the prevalence of Rebeca de Souza AZEVEDO3 SHULRGRQWDOPLFURRUJDQLVPVE\3&5%ORRGVDPSOHVZHUHFROOHFWHGIRU,/ǃ Flávia Sammartino MARIANO2 TNF-D and IL-6 analysis using ELISA kits. Results: Periodontal conditions of DM Natália Helena COLOMBO1 and NDM patients were similar, without statistical differences in periodontal indices. When considering patients with gingivitis, all lipid parameters Natália Leal VIZOTO2 evaluated were highest in the DM group; Capnocytophaga sputigena and Renata de Oliveira Capnocytophaga ochracea were more prevalent in the periodontal sites of DM 2 MATTOS-GRANER children. “Red complex” bacteria were detected in few sites of DM and NDM groups. Fusobacterium nucleatum and Campylobacter rectus were frequently IRXQGLQERWKJURXSV6LPLODUOHYHOVRI,/ǃ71)D -
Yopb and Yopd Constitute a Novel Class of Yersinia Yop Proteins
INFECTION AND IMMUNITY, Jan. 1993, p. 71-80 Vol. 61, No. 1 0019-9567/93/010071-10$02.00/0 Copyright © 1993, American Society for Microbiology YopB and YopD Constitute a Novel Class of Yersinia Yop Proteins SEBASTIAN HAKANSSON,1 THOMAS BERGMAN,1 JEAN-CLAUDE VANOOTEGHEM, 2 GUY CORNELIS,2 AND HANS WOLF-WATZ1* Department of Cell and Molecular Biology, University of Umed, S-901 87 Umed, Sweden,' and Microbial Pathogenesis Unit, Intemnational Institute of Cellular and Molecular Pathology and Faculte6 de Medecine, Universite Catholique de Louvain, B-1200 Brussels, Belgium2 Received 21 May 1992/Accepted 21 October 1992 Virulent Yersinia species harbor a common plasmid that encodes essential virulence determinants (Yersinia outer proteins [Yops]), which are regulated by the extracellular stimuli Ca2" and temperature. The V-antigen-encoding operon has been shown to be involved in the Ca2 -regulated negative pathway. The genetic organization of the V-antigen operon and the sequence of the krGVH genes were recently presented. The V-antigen operon was shown to be a polycistronic operon having the gene order kcrGVH-yopBD (T. Bergman, S. Hakansson, A. Forsberg, L. Norlander, A. Maceliaro, A. Backman, I. Bolin, and H. Wolf-Watz, J. Bacteriol. 173:1607-1616, 1991; S. B. Price, K. Y. Leung, S. S. Barve, and S. C. Straley, J. Bacteriol. 171:5646-5653, 1989). We present here the sequence of the distal part of the V-antigen operons of Yersinia pseudotuberculosis and Yersinia enterocolitica. The sequence information encompasses theyopB andyopD genes and a downstream region in both species. We conclude that the V-antigen operon ends with theyopD gene. -
Activity of Chlorhexidine Formulations on Oral Microorganisms and Periodontal Ligament Fibroblasts
Activity of chlorhexidine formulations on oral microorganisms and periodontal ligament fibroblasts Accepted for publication December 17, 2020 Alexandra Stähli1, Irina Liakhova1, Barbara Cvikl2, Adrian Lussi3, Anton Sculean1, Sigrun Eick1* 1Department of Periodontology, School of Dental Medicine, University of Bern, Switzerland 2Department of Conservative Dentistry, Sigmund Freud University, Vienna, Austria 3Department of Operative Dentistry and Periodontology, Faculty of Dentistry, University Medical Centre, Freiburg, Germany and School of Dental Medicine, University of Bern, Switzerland Keywords: biofilm; antiseptics; cytotoxicity Correspondence: Sigrun Eick, Klinik für Parodontologie, Labor Orale Mikrobiologie, Freiburgstrasse 7, CH-3010 Bern e-mail: [email protected]; phone +41 31 623 2542 1 Abstract Given the importance of microorganisms in the pathogenesis of the two most prevalent oral diseases (i.e. caries and periodontitis), antiseptics are widely used. Among the antiseptics chlorhexidine (CHX) is still considered as gold standard. The purpose of this in-vitro-study was to determine the antimicrobial activity of new CHX digluconate containing formulations produced in Switzerland. Two test formulations, with 0.1% or 0.2% CHX (TestCHX0.1, TestCHX0.2) were compared with 0.1% and 0.2% CHX digluconate solutions (CHXph0.1, CHXph0.2) without additives and with a commercially available formulation containing 0.2% CHX digluconate (CHXcom0.2). The minimal inhibitory concentrations (MIC) of the CHX formulations were determined against bacteria associated with caries or periodontal disease. Then the anti-biofilm activities of CHX preparations were tested regarding inhibition of biofilm formation or against an existing biofilm. Further, the cytotoxicity of the CHX preparations against periodontal ligament (PDL) fibroblasts was measured. There were no or only minor differences of the MIC values between the CHX preparations.