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Pizzolante G, Cordero C, Tredici SM, Vergara D, Pontieri P, Del Giudice L, Capuzzo A, Rubiolo P, Kanchiswamy CN, Zebelo SA, Bicchi C, Maffei ME, Alifano P. Cultivable gut bacteria provide a pathway for adaptation of Chrysolina herbacea to Mentha aquatica volatiles. BMC PLANT BIOLOGY 2017; 17:30. [PMID: 28249605 PMCID: PMC5333409 DOI: 10.1186/s12870-017-0986-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 01/24/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND A chemical cross-talk between plants and insects is required in order to achieve a successful co-adaptation. In response to herbivory, plants produce specific compounds, and feeding insects respond adequately7 to molecules produced by plants. Here we show the role of the gut microbial community of the mint beetle Chrysolina herbacea in the chemical cross-talk with Mentha aquatica (or watermint). RESULTS By using two-dimensional gas chromatography-mass spectrometry we first evaluated the chemical patterns of both M. aquatica leaf and frass volatiles extracted by C. herbacea males and females feeding on plants, and observed marked differences between males and females volatiles. The sex-specific chemical pattern of the frass paralleled with sex-specific distribution of cultivable gut bacteria. Indeed, all isolated gut bacteria from females belonged to either α- or γ-Proteobacteria, whilst those from males were γ-Proteobacteria or Firmicutes. We then demonstrated that five Serratia marcescens strains from females possessed antibacterial activity against bacteria from males belonging to Firmicutes suggesting competition by production of antimicrobial compounds. By in vitro experiments, we lastly showed that the microbial communities from the two sexes were associated to specific metabolic patterns with respect to their ability to biotransform M. aquatica terpenoids, and metabolize them into an array of compounds with possible pheromone activity. CONCLUSIONS Our data suggest that cultivable gut bacteria of Chrysolina herbacea males and females influence the volatile blend of herbivory induced Mentha aquatica volatiles in a sex-specific way.
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Affiliation(s)
- Graziano Pizzolante
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni 165, 73100 Lecce, Italy
| | - Chiara Cordero
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via Pietro Giuria n°9, 10125 Torino, Italy
| | - Salvatore M. Tredici
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni 165, 73100 Lecce, Italy
| | - Davide Vergara
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni 165, 73100 Lecce, Italy
| | - Paola Pontieri
- Dipartimento di Biologia, Sezione di Igiene, Institute of Biosciences and Bioresources-UOS Portici (IBBR-UOS Portici), CNR, Portici (NA) c/o, 80134 Naples, Italy
| | - Luigi Del Giudice
- Dipartimento di Biologia, Sezione di Igiene, Institute of Biosciences and Bioresources-UOS Portici (IBBR-UOS Portici), CNR, Portici (NA) c/o, 80134 Naples, Italy
| | - Andrea Capuzzo
- Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università di Torino, Via Quarello 15/A, 10135 Torino, Italy
| | - Patrizia Rubiolo
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via Pietro Giuria n°9, 10125 Torino, Italy
| | - Chidananda N. Kanchiswamy
- Research and Innovation Centre Genomics and Biology of Fruit Crop Department, Fondazione Edmund Mach (FEM), Istituto Agrario San Michele (IASMA), Via Mach 1, 38010 San Michele all’Adige, TN Italy
| | - Simon A. Zebelo
- Department of Natural Sciences, University of Maryland Eastern Shore, 1117 Trigg Hall, Princess Anne, 21853 MD USA
| | - Carlo Bicchi
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via Pietro Giuria n°9, 10125 Torino, Italy
| | - Massimo E. Maffei
- Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università di Torino, Via Quarello 15/A, 10135 Torino, Italy
| | - Pietro Alifano
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni 165, 73100 Lecce, Italy
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152
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Guérin A, Dargaignaratz C, Clavel T, Broussolle V, Nguyen-The C. Heat-resistance of psychrotolerant Bacillus cereus vegetative cells. Food Microbiol 2017; 64:195-201. [PMID: 28213026 DOI: 10.1016/j.fm.2017.01.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 01/17/2017] [Accepted: 01/19/2017] [Indexed: 12/31/2022]
Abstract
Spores of psychrotolerant strains of the foodborne pathogen Bacillus cereus can multiply during storage of cooked or pasteurized, refrigerated foods and can represent a risk if these cells are not eliminated during reheating of food product before consumption. We determined the heat-resistance of psychrotolerant B. cereus vegetative cells at different heating temperatures in laboratory medium and compared it with that of thermotolerant B. cereus vegetative cells. The z values, based on times for a 3 log10 reduction, of the vegetative cells of the three psychrotolerant phylogenetic groups of B. cereus varied between 3.02 °C and 4.84 °C. The temperature at which a 3 log10 reduction was achieved in 10 min varied between 47.6 °C and 49.2 °C for psychrotolerant vegetative cells and it was around 54.8 °C for thermotolerant vegetative cells. Moreover, 0.4 min at 60 °C would be sufficient for a 6 log10 CFU/ml reduction of the most heat resistant psychrotolerant B. cereus vegetative cells. These data clearly showed that psychrotolerant B. cereus vegetative cells can be rapidly eliminated by a mild heat treatment such as food reheating.
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Affiliation(s)
- Alizée Guérin
- UMR408 SQPOV « Sécurité et Qualité des Produits d'Origine Végétale », INRA, University of Avignon, 84000 Avignon, France
| | - Claire Dargaignaratz
- UMR408 SQPOV « Sécurité et Qualité des Produits d'Origine Végétale », INRA, University of Avignon, 84000 Avignon, France
| | - Thierry Clavel
- UMR408 SQPOV « Sécurité et Qualité des Produits d'Origine Végétale », INRA, University of Avignon, 84000 Avignon, France
| | - Véronique Broussolle
- UMR408 SQPOV « Sécurité et Qualité des Produits d'Origine Végétale », INRA, University of Avignon, 84000 Avignon, France
| | - Christophe Nguyen-The
- UMR408 SQPOV « Sécurité et Qualité des Produits d'Origine Végétale », INRA, University of Avignon, 84000 Avignon, France.
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153
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Glenwright H, Pohl S, Navarro F, Miro E, Jiménez G, Blanch AR, Harwood CR. The Identification of Intrinsic Chloramphenicol and Tetracycline Resistance Genes in Members of the Bacillus cereus Group ( sensu lato). Front Microbiol 2017; 7:2122. [PMID: 28101085 PMCID: PMC5209696 DOI: 10.3389/fmicb.2016.02122] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 12/15/2016] [Indexed: 11/24/2022] Open
Abstract
Bacillus toyonensis strain BCT-7112T (NCIMB 14858T) has been widely used as an additive in animal nutrition for more than 30 years without reports of adverse toxigenic effects. However, this strain is resistant to chloramphenicol and tetracycline and it is generally considered inadvisable to introduce into the food chain resistance determinants capable of being transferred to other bacterial strains, thereby adding to the pool of such determinants in the gastro-enteric systems of livestock species. We therefore characterized the resistance phenotypes of this strain and its close relatives to determine whether they were of recent origin, and therefore likely to be transmissible. To this end we identified the genes responsible for chloramphenicol (catQ) and tetracycline (tetM) resistance and confirmed the presence of homologs in other members of the B. toyonensis taxonomic unit. Unexpectedly, closely related strains encoding these genes did not exhibit chloramphenicol and tetracycline resistance phenotypes. To understand the differences in the behaviors, we cloned and expressed the genes, together with their upstream regulatory regions, into Bacillus subtilis. The data showed that the genes encoded functional proteins, but were expressed inefficiently from their native promoters. B. toyonensis is a taxonomic unit member of the Bacillus cereus group (sensu lato). We therefore extended the analysis to determine the extent to which homologous chloramphenicol and tetracycline resistance genes were present in other species within this group. This analysis revealed that homologous genes were present in nearly all representative species within the B. cereus group (sensu lato). The absence of known transposition elements and the observations that they are found at the same genomic locations, indicates that these chloramphenicol and tetracycline resistance genes are of ancient origin and intrinsic to this taxonomic group, rather than recent acquisitions. In this context we discuss definitions of what are and are not intrinsic genes, an issue that is of fundamental importance to both Regulatory Authorities, and the animal feed and related industries.
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Affiliation(s)
- Helen Glenwright
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biology, Newcastle UniversityNewcastle upon Tyne, UK
| | - Susanne Pohl
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biology, Newcastle UniversityNewcastle upon Tyne, UK
| | - Ferran Navarro
- Servei de Microbiologia, Hospital de la Santa Creu i Sant Pau, Institut d'Investigació Biomèdica Sant PauBarcelona, Spain
| | - Elisenda Miro
- Servei de Microbiologia, Hospital de la Santa Creu i Sant Pau, Institut d'Investigació Biomèdica Sant PauBarcelona, Spain
| | | | - Anicet R. Blanch
- Department of Microbiology, University of BarcelonaBarcelona, Spain
| | - Colin R. Harwood
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biology, Newcastle UniversityNewcastle upon Tyne, UK
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154
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Munson E, Carroll KC. What's in a Name? New Bacterial Species and Changes to Taxonomic Status from 2012 through 2015. J Clin Microbiol 2017; 55:24-42. [PMID: 27795334 PMCID: PMC5228236 DOI: 10.1128/jcm.01379-16] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Technological advancements in fields such as molecular genetics and the human microbiome have resulted in an unprecedented recognition of new bacterial genus/species designations by the International Journal of Systematic and Evolutionary Microbiology Knowledge of designations involving clinically significant bacterial species would benefit clinical microbiologists in the context of emerging pathogens, performance of accurate organism identification, and antimicrobial susceptibility testing. In anticipation of subsequent taxonomic changes being compiled by the Journal of Clinical Microbiology on a biannual basis, this compendium summarizes novel species and taxonomic revisions specific to bacteria derived from human clinical specimens from the calendar years 2012 through 2015.
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Affiliation(s)
- Erik Munson
- College of Health Sciences, Marquette University, Milwaukee, Wisconsin, USA
| | - Karen C Carroll
- Division of Medical Microbiology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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155
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156
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Abfalter CM, Schönauer E, Ponnuraj K, Huemer M, Gadermaier G, Regl C, Briza P, Ferreira F, Huber CG, Brandstetter H, Posselt G, Wessler S. Cloning, Purification and Characterization of the Collagenase ColA Expressed by Bacillus cereus ATCC 14579. PLoS One 2016; 11:e0162433. [PMID: 27588686 PMCID: PMC5010206 DOI: 10.1371/journal.pone.0162433] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 08/23/2016] [Indexed: 11/18/2022] Open
Abstract
Bacterial collagenases differ considerably in their structure and functions. The collagenases ColH and ColG from Clostridium histolyticum and ColA expressed by Clostridium perfringens are well-characterized collagenases that cleave triple-helical collagen, which were therefore termed as ´true´ collagenases. ColA from Bacillus cereus (B. cereus) has been added to the collection of true collagenases. However, the molecular characteristics of B. cereus ColA are less understood. In this study, we identified ColA as a secreted true collagenase from B. cereus ATCC 14579, which is transcriptionally controlled by the regulon phospholipase C regulator (PlcR). B. cereus ATCC 14579 ColA was cloned to express recombinant wildtype ColA (ColAwt) and mutated to a proteolytically inactive (ColAE501A) version. Recombinant ColAwt was tested for gelatinolytic and collagenolytic activities and ColAE501A was used for the production of a polyclonal anti-ColA antibody. Comparison of ColAwt activity with homologous proteases in additional strains of B. cereus sensu lato (B. cereus s.l.) and related clostridial collagenases revealed that B. cereus ATCC 14579 ColA is a highly active peptidolytic and collagenolytic protease. These findings could lead to a deeper insight into the function and mechanism of bacterial collagenases which are used in medical and biotechnological applications.
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Affiliation(s)
- Carmen M. Abfalter
- Department of Molecular Biology, Division of Microbiology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Esther Schönauer
- Department of Molecular Biology, Division of Structural Biology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Karthe Ponnuraj
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai, India
| | - Markus Huemer
- Department of Molecular Biology, Division of Microbiology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Gabriele Gadermaier
- Department of Molecular Biology, Division of Allergy and Immunology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Christof Regl
- Department of Molecular Biology, Division of Chemistry and Bioanalytics, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Peter Briza
- Department of Molecular Biology, Division of Allergy and Immunology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Fatima Ferreira
- Department of Molecular Biology, Division of Allergy and Immunology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Christian G. Huber
- Department of Molecular Biology, Division of Chemistry and Bioanalytics, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Hans Brandstetter
- Department of Molecular Biology, Division of Structural Biology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Gernot Posselt
- Department of Molecular Biology, Division of Microbiology, Paris-Lodron University of Salzburg, Salzburg, Austria
| | - Silja Wessler
- Department of Molecular Biology, Division of Microbiology, Paris-Lodron University of Salzburg, Salzburg, Austria
- * E-mail:
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157
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Miller RA, Beno SM, Kent DJ, Carroll LM, Martin NH, Boor KJ, Kovac J. Bacillus wiedmannii sp. nov., a psychrotolerant and cytotoxic Bacillus cereus group species isolated from dairy foods and dairy environments. Int J Syst Evol Microbiol 2016; 66:4744-4753. [PMID: 27520992 DOI: 10.1099/ijsem.0.001421] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A facultatively anaerobic, spore-forming Bacillus strain, FSL W8-0169T, collected from raw milk stored in a silo at a dairy powder processing plant in the north-eastern USA was initially identified as a Bacillus cereus group species based on a partial sequence of the rpoB gene and 16S rRNA gene sequence. Analysis of core genome single nucleotide polymorphisms clustered this strain separately from known B. cereus group species. Pairwise average nucleotide identity blast values obtained for FSL W8-0169T compared to the type strains of existing B. cereus group species were <95 % and predicted DNA-DNA hybridization values were <70 %, suggesting that this strain represents a novel B. cereus group species. We characterized 10 additional strains with the same or closely related rpoB allelic type, by whole genome sequencing and phenotypic analyses. Phenotypic characterization identified a higher content of iso-C16 : 0 fatty acid and the combined inability to ferment sucrose or to hydrolyse arginine as the key characteristics differentiating FSL W8-0169T from other B. cereus group species. FSL W8-0169T is psychrotolerant, produces haemolysin BL and non-haemolytic enterotoxin, and is cytotoxic in a HeLa cell model. The name Bacillus wiedmannii sp. nov. is proposed for the novel species represented by the type strain FSL W8-0169T (=DSM 102050T=LMG 29269T).
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Affiliation(s)
- Rachel A Miller
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - Sarah M Beno
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - David J Kent
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - Laura M Carroll
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - Nicole H Martin
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - Kathryn J Boor
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
| | - Jasna Kovac
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
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158
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Kovac J, Miller RA, Carroll LM, Kent DJ, Jian J, Beno SM, Wiedmann M. Production of hemolysin BL by Bacillus cereus group isolates of dairy origin is associated with whole-genome phylogenetic clade. BMC Genomics 2016; 17:581. [PMID: 27507015 PMCID: PMC4979109 DOI: 10.1186/s12864-016-2883-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 07/06/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Bacillus cereus group isolates that produce diarrheal or emetic toxins are frequently isolated from raw milk and, in spore form, can survive pasteurization. Several species within the B. cereus group are closely related and cannot be reliably differentiated by established taxonomical criteria. While B. cereus is traditionally recognized as the principal causative agent of foodborne disease in this group, there is a need to better understand the distribution and expression of different toxin and virulence genes among B. cereus group food isolates to facilitate reliable characterization that allows for assessment of the likelihood of a given isolate to cause a foodborne disease. RESULTS We performed whole genome sequencing of 22 B. cereus group dairy isolates, which represented considerable genetic diversity not covered by other isolates characterized to date. Maximum likelihood analysis of these genomes along with 47 reference genomes representing eight validly published species revealed nine phylogenetic clades. Three of these clades were represented by a single species (B. toyonensis -clade V, B. weihenstephanensis - clade VI, B. cytotoxicus - VII), one by two dairy-associated isolates (clade II; representing a putative new species), one by two species (B. mycoides, B. pseudomycoides - clade I) and four by three species (B. cereus, B. thuringiensis, B. anthracis - clades III-a, b, c and IV). Homologues of genes encoding a principal diarrheal enterotoxin (hemolysin BL) were distributed across all, except the B. cytotoxicus clade. Using a lateral flow immunoassay, hemolysin BL was detected in 13 out of 18 isolates that carried hblACD genes. Isolates from clade III-c (which included B. cereus and B. thuringiensis) consistently did not carry hblACD and did not produce hemolysin BL. Isolates from clade IV (B. cereus, B. thuringiensis) consistently carried hblACD and produced hemolysin BL. Compared to others, clade IV was significantly (p = 0.0001) more likely to produce this toxin. Isolates from clade VI (B. weihenstephanensis) carried hblACD homologues, but did not produce hemolysin BL, possibly due to amino acid substitutions in different toxin-encoding genes. CONCLUSIONS Our results demonstrate that production of diarrheal enterotoxin hemolysin BL is neither inclusive nor exclusive to B. cereus sensu stricto, and that phylogenetic classification of isolates may be better than taxonomic identification for assessment of B. cereus group isolates risk for causing a diarrheal foodborne disease.
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Affiliation(s)
- Jasna Kovac
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Rachel A Miller
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Laura M Carroll
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - David J Kent
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Jiahui Jian
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Sarah M Beno
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Martin Wiedmann
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA.
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159
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Pfrunder S, Grossmann J, Hunziker P, Brunisholz R, Gekenidis MT, Drissner D. Bacillus cereus Group-Type Strain-Specific Diagnostic Peptides. J Proteome Res 2016; 15:3098-107. [DOI: 10.1021/acs.jproteome.6b00216] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefanie Pfrunder
- Agroscope, Institute
for Food Sciences, Schloss
1, 8820 Waedenswil, Switzerland
| | - Jonas Grossmann
- Functional
Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstraße
190, 8057 Zurich, Switzerland
| | - Peter Hunziker
- Functional
Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstraße
190, 8057 Zurich, Switzerland
| | - René Brunisholz
- Functional
Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstraße
190, 8057 Zurich, Switzerland
| | - Maria-Theresia Gekenidis
- Agroscope, Institute
for Food Sciences, Schloss
1, 8820 Waedenswil, Switzerland
- ETH Zurich, Institute of Food, Nutrition and
Health, Schmelzbergstraße
7, 8092 Zurich, Switzerland
| | - David Drissner
- Agroscope, Institute
for Food Sciences, Schloss
1, 8820 Waedenswil, Switzerland
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160
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Risks for public health related to the presence of Bacillus cereus and other Bacillus spp. including Bacillus thuringiensis in foodstuffs. EFSA J 2016. [DOI: 10.2903/j.efsa.2016.4524] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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161
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Madeira JP, Omer H, Alpha-Bazin B, Armengaud J, Duport C. Deciphering the interactions between the Bacillus cereus linear plasmid, pBClin15, and its host by high-throughput comparative proteomics. J Proteomics 2016; 146:25-33. [PMID: 27321915 DOI: 10.1016/j.jprot.2016.06.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 04/22/2016] [Accepted: 06/15/2016] [Indexed: 10/21/2022]
Abstract
UNLABELLED The pathogen, Bacillus cereus, is able to adapt its metabolism to various environmental conditions. The reference strain, Bacillus cereus ATCC 14579, harbors a linear plasmid, pBClin15, which displays a cryptic prophage behavior. Here, we studied the impact of pBClin15 on the aerobic respiratory metabolism of B. cereus by curing its host strain. We compared, by means of a high-throughput shotgun proteomic approach, both the cellular proteome and the exoproteome of B. cereus ATCC 14579 in the presence and absence of pBClin15 at the early, late and stationary growth phases. The results were visualized through a hierarchical cluster analysis of proteomic data. We found that pBClin15 contributes significantly to the metabolic efficiency of B. cereus by restricting the production of chromosome-encoded phage proteins in the extracellular milieu. The data also revealed intricate regulatory mechanisms between pBClin15 and its host. Finally, we show that pBClin15 provides benefit to its host to adapt to different ecologic niches. BIOLOGICAL SIGNIFICANCE Bacteria belonging to the Bacillus cereus group include B. cereus, a notorious food borne pathogen which causes gastroenteritis. The B. cereus type, strain ATCC 14579, harbors a linear plasmid, pBClin15, which displays cryptic prophage behavior. Here, we present data supporting the idea that pBClin15 may have a much greater role in B. cereus metabolism that has hitherto been suspected. Specifically, our comparative proteomic analyses reveal that pBClin15 manages B. cereus central metabolism to optimize energy and carbon utilization through the repression of several chromosome-encoded phage proteins. These results suggest that pBClin15 provides benefit to the host for surviving adverse environmental conditions.
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Affiliation(s)
- Jean-Paul Madeira
- SQPOV, UMR0408, Avignon Université, INRA, F-84914 Avignon, France; CEA, DSV, IBiTec-S, SPI, Li2D, Laboratory "Innovative technologies for Detection and Diagnostics", Bagnols-sur-Cèze F-30200, France
| | - Hélène Omer
- SQPOV, UMR0408, Avignon Université, INRA, F-84914 Avignon, France; CEA, DSV, IBiTec-S, SPI, Li2D, Laboratory "Innovative technologies for Detection and Diagnostics", Bagnols-sur-Cèze F-30200, France
| | - Béatrice Alpha-Bazin
- CEA, DSV, IBiTec-S, SPI, Li2D, Laboratory "Innovative technologies for Detection and Diagnostics", Bagnols-sur-Cèze F-30200, France
| | - Jean Armengaud
- CEA, DSV, IBiTec-S, SPI, Li2D, Laboratory "Innovative technologies for Detection and Diagnostics", Bagnols-sur-Cèze F-30200, France
| | - Catherine Duport
- SQPOV, UMR0408, Avignon Université, INRA, F-84914 Avignon, France.
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162
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Wang P, Zhu Y, Zhang Y, Zhang C, Xu J, Deng Y, Peng D, Ruan L, Sun M. Mob/oriT, a mobilizable site-specific recombination system for unmarked genetic manipulation in Bacillus thuringiensis and Bacillus cereus. Microb Cell Fact 2016; 15:108. [PMID: 27286821 PMCID: PMC4902927 DOI: 10.1186/s12934-016-0492-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 05/23/2016] [Indexed: 11/29/2022] Open
Abstract
Background Bacillus thuringiensis and Bacillus cereus are two important species in B. cereus group. The intensive study of these strains at the molecular level and construction of genetically modified bacteria requires the development of efficient genetic tools. To insert genes into or delete genes from bacterial chromosomes, marker-less manipulation methods were employed. Results We present a novel genetic manipulation method for B. thuringiensis and B. cereus strains that does not leave selection markers. Our approach takes advantage of the relaxase Mob02281 encoded by plasmid pBMB0228 from Bacillus thuringiensis. In addition to its mobilization function, this Mob protein can mediate recombination between oriT sites. The Mob02281 mobilization module was associated with a spectinomycin-resistance gene to form a Mob-Spc cassette, which was flanked by the core 24-bp oriT sequences from pBMB0228. A strain in which the wild-type chromosome was replaced with the modified copy containing the Mob-Spc cassette at the target locus was obtained via homologous recombination. Thus, the spectinomycin-resistance gene can be used to screen for Mob-Spc cassette integration mutants. Recombination between the two oriT sequences mediated by Mob02281, encoded by the Mob-Spc cassette, resulted in the excision of the Mob-Spc cassette, producing the desired chromosomal alteration without introducing unwanted selection markers. We used this system to generate an in-frame deletion of a target gene in B. thuringiensis as well as a gene located in an operon of B. cereus. Moreover, we demonstrated that this system can be used to introduce a single gene or an expression cassette of interest in B. thuringiensis. Conclusion The Mob/oriT recombination system provides an efficient method for unmarked genetic manipulation and for constructing genetically modified bacteria of B. thuringiensis and B. cereus. Our method extends the available genetic tools for B. thuringiensis and B. cereus strains. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0492-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Pengxia Wang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Yiguang Zhu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Yuyang Zhang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Chunyi Zhang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Jianyi Xu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Yun Deng
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Donghai Peng
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Lifang Ruan
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Ming Sun
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China.
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163
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Fiedoruk K, Daniluk T, Fiodor A, Drewicka E, Buczynska K, Leszczynska K, Bideshi DK, Swiecicka I. MALDI-TOF MS portrait of emetic and non-emetic Bacillus cereus group members. Electrophoresis 2016; 37:2235-47. [PMID: 27196540 DOI: 10.1002/elps.201500308] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 04/25/2016] [Accepted: 05/09/2016] [Indexed: 11/09/2022]
Abstract
The number of foodborne intoxications caused by emetic Bacillus cereus isolates has increased significantly. As such, rapid and reliable methods to identify emetic strains appear to be clinically relevant. In this study, intact cell matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to differentiate emetic and non-emetic bacilli. The phyloproteomic clustering of 34 B. cereus emetic and 88 non-emetic isolates classified as B. cereus, Bacillus thuringiensis, Bacillus weihenstephanensis, and Bacillus mycoides, showed (i) a clear separation of both groups at a similarity level of 43%, and (ii) a high relatedness among the emetic isolates (similarity of 78%). Specifically, 83 mass peak classes were recognized in the spectral window range between m/z 4000 and 12 000 that were tentatively assigned to 41 protein variants based on a bioinformatic approach. Mass variation between the emetic and the non-emetic subsets was recorded for 27 of them, including ten ribosomal subunit proteins, for which inter-strain polymorphism was confirmed by gene sequencing. Additional peaks were assigned to other proteins such as small acid soluble proteins, cold shock proteins and hypothetical proteins, e.g., carbohydrate kinase. Moreover, the results were supported by in silico analysis of the biomarkers in 259 members of B. cereus group, including Bacillus anthracis, based on their whole-genome sequences. In conclusion, the proteomic profiling by MALDI-TOF MS is a promising and rapid method for pre-screening B. cereus to identify medically relevant isolates and for epidemiologic purposes.
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Affiliation(s)
- Krzysztof Fiedoruk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Tamara Daniluk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Angelika Fiodor
- Department of Microbiology, University of Bialystok, Bialystok, Poland
| | - Ewa Drewicka
- Department of Microbiology, University of Bialystok, Bialystok, Poland
| | | | | | - Dennis Ken Bideshi
- Department of Natural and Mathematical Science, California Baptist University, Riverside, USA.,Department of Entomology, University of California, Riverside, USA
| | - Izabela Swiecicka
- Department of Microbiology, University of Bialystok, Bialystok, Poland.,Laboratory of Applied Microbiology, University of Bialystok, Bialystok, Poland
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164
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Warda AK, Siezen RJ, Boekhorst J, Wells-Bennik MHJ, de Jong A, Kuipers OP, Nierop Groot MN, Abee T. Linking Bacillus cereus Genotypes and Carbohydrate Utilization Capacity. PLoS One 2016; 11:e0156796. [PMID: 27272929 PMCID: PMC4896439 DOI: 10.1371/journal.pone.0156796] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/19/2016] [Indexed: 11/19/2022] Open
Abstract
We characterised carbohydrate utilisation of 20 newly sequenced Bacillus cereus strains isolated from food products and food processing environments and two laboratory strains, B. cereus ATCC 10987 and B. cereus ATCC 14579. Subsequently, genome sequences of these strains were analysed together with 11 additional B. cereus reference genomes to provide an overview of the different types of carbohydrate transporters and utilization systems found in B. cereus strains. The combined application of API tests, defined growth media experiments and comparative genomics enabled us to link the carbohydrate utilisation capacity of 22 B. cereus strains with their genome content and in some cases to the panC phylogenetic grouping. A core set of carbohydrates including glucose, fructose, maltose, trehalose, N-acetyl-glucosamine, and ribose could be used by all strains, whereas utilisation of other carbohydrates like xylose, galactose, and lactose, and typical host-derived carbohydrates such as fucose, mannose, N-acetyl-galactosamine and inositol is limited to a subset of strains. Finally, the roles of selected carbohydrate transporters and utilisation systems in specific niches such as soil, foods and the human host are discussed.
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Affiliation(s)
- Alicja K. Warda
- TI Food and Nutrition, Wageningen, The Netherlands
- Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands
- Wageningen UR Food & Biobased Research, Wageningen, The Netherlands
| | - Roland J. Siezen
- TI Food and Nutrition, Wageningen, The Netherlands
- Center for Molecular and Biomolecular Informatics, RadboudUMC, Nijmegen, The Netherlands
- Microbial Bioinformatics, Ede, The Netherlands
| | - Jos Boekhorst
- TI Food and Nutrition, Wageningen, The Netherlands
- Center for Molecular and Biomolecular Informatics, RadboudUMC, Nijmegen, The Netherlands
- NIZO Food Research B.V., Ede, The Netherlands
| | | | - Anne de Jong
- TI Food and Nutrition, Wageningen, The Netherlands
- Department of Molecular Genetics, University of Groningen, Groningen, The Netherlands
| | - Oscar P. Kuipers
- TI Food and Nutrition, Wageningen, The Netherlands
- Department of Molecular Genetics, University of Groningen, Groningen, The Netherlands
| | - Masja N. Nierop Groot
- TI Food and Nutrition, Wageningen, The Netherlands
- Wageningen UR Food & Biobased Research, Wageningen, The Netherlands
| | - Tjakko Abee
- TI Food and Nutrition, Wageningen, The Netherlands
- Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands
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165
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Böhm ME, Krey VM, Jeßberger N, Frenzel E, Scherer S. Comparative Bioinformatics and Experimental Analysis of the Intergenic Regulatory Regions of Bacillus cereus hbl and nhe Enterotoxin Operons and the Impact of CodY on Virulence Heterogeneity. Front Microbiol 2016; 7:768. [PMID: 27252687 PMCID: PMC4877379 DOI: 10.3389/fmicb.2016.00768] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Accepted: 05/06/2016] [Indexed: 12/18/2022] Open
Abstract
Bacillus cereus is a food contaminant with greatly varying enteropathogenic potential. Almost all known strains harbor the genes for at least one of the three enterotoxins Nhe, Hbl, and CytK. While some strains show no cytotoxicity, others have caused outbreaks, in rare cases even with lethal outcome. The reason for these differences in cytotoxicity is unknown. To gain insight into the origin of enterotoxin expression heterogeneity in different strains, the architecture and role of 5′ intergenic regions (5′ IGRs) upstream of the nhe and hbl operons was investigated. In silico comparison of 142 strains of all seven phylogenetic groups of B. cereus sensu lato proved the presence of long 5′ IGRs upstream of the nheABC and hblCDAB operons, which harbor recognition sites for several transcriptional regulators, including the virulence regulator PlcR, redox regulators ResD and Fnr, the nutrient-sensitive regulator CodY as well as the master regulator for biofilm formation SinR. By determining transcription start sites, unusually long 5′ untranslated regions (5′ UTRs) upstream of the nhe and hbl start codons were identified, which are not present upstream of cytK-1 and cytK-2. Promoter fusions lacking various parts of the nhe and hbl 5′ UTR in B. cereus INRA C3 showed that the entire 331 bp 5′ UTR of nhe is necessary for full promoter activity, while the presence of the complete 606 bp hbl 5′ UTR lowers promoter activity. Repression was caused by a 268 bp sequence directly upstream of the hbl transcription start. Luciferase activity of reporter strains containing nhe and hbl 5′ IGR lux fusions provided evidence that toxin gene transcription is upregulated by the depletion of free amino acids. Electrophoretic mobility shift assays showed that the branched-chain amino acid sensing regulator CodY binds to both nhe and hbl 5′ UTR downstream of the promoter, potentially acting as a nutrient-responsive roadblock repressor of toxin gene transcription. PlcR binding sites are highly conserved among all B. cereus sensu lato strains, indicating that this regulator does not significantly contribute to the heterogeneity in virulence potentials. The CodY recognition sites are far less conserved, perhaps conferring varying strengths of CodY binding, which might modulate toxin synthesis in a strain-specific manner.
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Affiliation(s)
- Maria-Elisabeth Böhm
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München, Freising Germany
| | - Viktoria M Krey
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München, Freising Germany
| | - Nadja Jeßberger
- Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München, Oberschleißheim Germany
| | - Elrike Frenzel
- Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen Netherlands
| | - Siegfried Scherer
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München, Freising Germany
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166
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Transcriptome analysis of Bacillus thuringiensis spore life, germination and cell outgrowth in a vegetable-based food model. Food Microbiol 2016; 55:73-85. [DOI: 10.1016/j.fm.2015.11.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 11/03/2015] [Accepted: 11/10/2015] [Indexed: 11/19/2022]
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167
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Na H, Kong M, Ryu S. Characterization of LysPBC4, a novel Bacillus cereus-specific endolysin of bacteriophage PBC4. FEMS Microbiol Lett 2016; 363:fnw092. [PMID: 27190165 DOI: 10.1093/femsle/fnw092] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2016] [Indexed: 01/27/2023] Open
Abstract
Bacillus cereus is a spore-forming, Gram-positive bacterium and is a major food-borne pathogen. A B. cereus-specific bacteriophage PBC4 was isolated from the soil of a stock farm, and its genome was analyzed. PBC4 belongs to the Siphoviridae family and has a genome consisting of 80 647-bp-long double-stranded DNA, including 123 genes and two tRNAs. LysPBC4, the endolysin of PBC4, has an enzymatically active domain (EAD) on its N-terminal region and a putative cell wall-binding domain (CBD) on its C-terminal region, respectively. Although the phage PBC4 showed a very limited host range, LysPBC4 could lyse all of the B. cereus strains tested. However, LysPBC4 did not kill other bacteria such as B. subtilis or Listeria, indicating that the endolysin has specific lytic activity against the B. cereus group species. Furthermore, LysPBC4_CBD fused with enhanced green fluorescent protein (EGFP) could decorate limited strains of B. cereus group, suggesting that the LysPBC4_CBD may be a promising material for specific detection of B. cereus.
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Affiliation(s)
- Hongjun Na
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, South Korea
| | - Minsuk Kong
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, South Korea
| | - Sangryeol Ryu
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Sciences, and Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, South Korea
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168
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Schönauer E, Brandstetter H. Inhibition and Activity Regulation of Bacterial Collagenases. TOPICS IN MEDICINAL CHEMISTRY 2016. [DOI: 10.1007/7355_2016_9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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169
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Massive horizontal gene transfer, strictly vertical inheritance and ancient duplications differentially shape the evolution of Bacillus cereus enterotoxin operons hbl, cytK and nhe. BMC Evol Biol 2015; 15:246. [PMID: 26555390 PMCID: PMC4641410 DOI: 10.1186/s12862-015-0529-4] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 10/30/2015] [Indexed: 11/10/2022] Open
Abstract
Background Bacillus cereus sensu lato comprises eight closely related species including the human pathogens Bacillus anthracis and Bacillus cereus. Within B. cereus sensu lato, chromosomally and plasmid-encoded toxins exist. While plasmid-mediated horizontal gene transfer of the emetic toxin, anthrax and insecticidal toxins is known, evolution of enterotoxin genes within the group has not been studied. Results We report draft genome assemblies of 25 strains, a phylogenetic network of 142 strains based on ANI derived from genome sequences and a phylogeny based on whole-genome SNP analysis. The data clearly support subdivision of B. cereus sensu lato into seven phylogenetic groups. While group I, V and VII represent B. pseudomycoides, B. toyonensis and B. cytotoxicus, which are distinguishable at species level (ANI border ≥ 96 %), strains ascribed to the other five species do not match phylogenic groups. The chromosomal enterotoxin operons nheABC and hblCDAB are abundant within B. cereus both isolated from infections and from the environment. While the duplicated hbl variant hbla is present in 22 % of all strains investigated, duplication of nheABC is extremely rare (0.02 %) and appears to be phylogenetically unstable. Distribution of toxin genes was matched to a master tree based on seven concatenated housekeeping genes, which depicts species relationships in B. cereus sensu lato as accurately as whole-genome comparisons. Comparison to the phylogeny of enterotoxin genes uncovered ample evidence for horizontal transfer of hbl, cytK and plcR, as well as frequent deletion of both toxins and duplication of hbl. No evidence for nhe deletion was found and stable horizontal transfer of nhe is rare. Therefore, evolution of B. cereus enterotoxin operons is shaped unexpectedly different for yet unknown reasons. Conclusions Frequent exchange of the pathogenicity factors hbl, cytK and plcR in B. cereus sensu lato appears to be an important mechanism of B. cereus virulence evolution, including so-called probiotic or non-pathogenic species, which might have consequences for risk assessment procedures. In contrast, exclusively vertical inheritance of nhe was observed, and since nhe-negative strains appear to be extremely rare, we suggest that fitness loss may be associated with deletion or horizontal transfer of the nhe operon. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0529-4) contains supplementary material, which is available to authorized users.
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170
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The adaptive response of bacterial food-borne pathogens in the environment, host and food: Implications for food safety. Int J Food Microbiol 2015; 213:99-109. [DOI: 10.1016/j.ijfoodmicro.2015.06.004] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 05/21/2015] [Accepted: 06/08/2015] [Indexed: 11/19/2022]
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171
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Kroeger JK, Hassan K, Vörös A, Simm R, Saidijam M, Bettaney KE, Bechthold A, Paulsen IT, Henderson PJF, Kolstø AB. Bacillus cereus efflux protein BC3310 - a multidrug transporter of the unknown major facilitator family, UMF-2. Front Microbiol 2015; 6:1063. [PMID: 26528249 PMCID: PMC4601019 DOI: 10.3389/fmicb.2015.01063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 09/15/2015] [Indexed: 02/06/2023] Open
Abstract
Phylogenetic classification divides the major facilitator superfamily (MFS) into 82 families, including 25 families that are comprised of transporters with no characterized functions. This study describes functional data for BC3310 from Bacillus cereus ATCC 14579, a member of the “unknown major facilitator family-2” (UMF-2). BC3310 was shown to be a multidrug efflux pump conferring resistance to ethidium bromide, SDS and silver nitrate when heterologously expressed in Escherichia coli DH5α ΔacrAB. A conserved aspartate residue (D105) in putative transmembrane helix 4 was identified, which was essential for the energy dependent ethidium bromide efflux by BC3310. Transport proteins of the MFS comprise specific sequence motifs. Sequence analysis of UMF-2 proteins revealed that they carry a variant of the MFS motif A, which may be used as a marker to distinguish easily between this family and other MFS proteins. Genes orthologous to bc3310 are highly conserved within the B. cereus group of organisms and thus belong to the core genome, suggesting an important conserved functional role in the normal physiology of these bacteria.
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Affiliation(s)
- Jasmin K Kroeger
- Laboratory for Microbial Dynamics, Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo Oslo, Norway ; Institut für Pharmazeutische Biologie und Biotechnologie, Albert-Ludwigs Universität Freiburg, Germany
| | - Karl Hassan
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney NSW, Australia
| | - Aniko Vörös
- Laboratory for Microbial Dynamics, Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo Oslo, Norway
| | - Roger Simm
- Laboratory for Microbial Dynamics, Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo Oslo, Norway
| | - Massoud Saidijam
- School of BioMedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds Leeds, UK
| | - Kim E Bettaney
- School of BioMedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds Leeds, UK
| | - Andreas Bechthold
- Institut für Pharmazeutische Biologie und Biotechnologie, Albert-Ludwigs Universität Freiburg, Germany
| | - Ian T Paulsen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney NSW, Australia
| | - Peter J F Henderson
- School of BioMedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds Leeds, UK
| | - Anne-Brit Kolstø
- Laboratory for Microbial Dynamics, Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo Oslo, Norway
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172
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Liu Y, Lai Q, Göker M, Meier-Kolthoff JP, Wang M, Sun Y, Wang L, Shao Z. Genomic insights into the taxonomic status of the Bacillus cereus group. Sci Rep 2015; 5:14082. [PMID: 26373441 PMCID: PMC4571650 DOI: 10.1038/srep14082] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 08/17/2015] [Indexed: 02/01/2023] Open
Abstract
The identification and phylogenetic relationships of bacteria within the Bacillus cereus group are controversial. This study aimed at determining the taxonomic affiliations of these strains using the whole-genome sequence-based Genome BLAST Distance Phylogeny (GBDP) approach. The GBDP analysis clearly separated 224 strains into 30 clusters, representing eleven known, partially merged species and accordingly 19–20 putative novel species. Additionally, 16S rRNA gene analysis, a novel variant of multi-locus sequence analysis (nMLSA) and screening of virulence genes were performed. The 16S rRNA gene sequence was not sufficient to differentiate the bacteria within this group due to its high conservation. The nMLSA results were consistent with GBDP. Moreover, a fast typing method was proposed using the pycA gene, and where necessary, the ccpA gene. The pXO plasmids and cry genes were widely distributed, suggesting little correlation with the phylogenetic positions of the host bacteria. This might explain why classifications based on virulence characteristics proved unsatisfactory in the past. In summary, this is the first large-scale and systematic study of the taxonomic status of the bacteria within the B. cereus group using whole-genome sequences, and is likely to contribute to further insights into their pathogenicity, phylogeny and adaptation to diverse environments.
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Affiliation(s)
- Yang Liu
- State Key Laboratory Breeding Base of Marine Genetic Resources; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Centre; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
| | - Qiliang Lai
- State Key Laboratory Breeding Base of Marine Genetic Resources; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Centre; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
| | - Markus Göker
- Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH, Inhoffenstraβe 7B, 38124, Braunschweig, Germany
| | - Jan P Meier-Kolthoff
- Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH, Inhoffenstraβe 7B, 38124, Braunschweig, Germany
| | - Meng Wang
- TEDA School of Biological Sciences and Biotechnology Nankai University, Tianjin, China
| | - Yamin Sun
- TEDA School of Biological Sciences and Biotechnology Nankai University, Tianjin, China
| | - Lei Wang
- TEDA School of Biological Sciences and Biotechnology Nankai University, Tianjin, China
| | - Zongze Shao
- State Key Laboratory Breeding Base of Marine Genetic Resources; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Centre; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
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173
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Draft Genome Sequence of Bacillus cytotoxicus CVUAS 2833, a Very Close Relative to Type Strain NVH 391-98 Isolated from a Different Location. GENOME ANNOUNCEMENTS 2015; 3:3/4/e00901-15. [PMID: 26294623 PMCID: PMC4543501 DOI: 10.1128/genomea.00901-15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We report the draft genome sequence of Bacillus cytotoxicus CVUAS 2833, isolated from potato puree in Germany (2007), which is—despite its clearly different source—very similar to the type strain B. cytotoxicus NVH 391-98 isolated in France (average nucleotide identity, 99.5%).
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174
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Diomandé SE, Nguyen-The C, Guinebretière MH, Broussolle V, Brillard J. Role of fatty acids in Bacillus environmental adaptation. Front Microbiol 2015; 6:813. [PMID: 26300876 PMCID: PMC4525379 DOI: 10.3389/fmicb.2015.00813] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/23/2015] [Indexed: 11/23/2022] Open
Abstract
The large bacterial genus Bacillus is widely distributed in the environment and is able to colonize highly diverse niches. Some Bacillus species harbor pathogenic characteristics. The fatty acid (FA) composition is among the essential criteria used to define Bacillus species. Some elements of the FA pattern composition are common to Bacillus species, whereas others are specific and can be categorized in relation to the ecological niches of the species. Bacillus species are able to modify their FA patterns to adapt to a wide range of environmental changes, including changes in the growth medium, temperature, food processing conditions, and pH. Like many other Gram-positive bacteria, Bacillus strains display a well-defined FA synthesis II system that is equilibrated with a FA degradation pathway and regulated to efficiently respond to the needs of the cell. Like endogenous FAs, exogenous FAs may positively or negatively affect the survival of Bacillus vegetative cells and the spore germination ability in a given environment. Some of these exogenous FAs may provide a powerful strategy for preserving food against contamination by the Bacillus pathogenic strains responsible for foodborne illness.
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Affiliation(s)
- Sara E Diomandé
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France
| | - Christophe Nguyen-The
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France
| | - Marie-Hélène Guinebretière
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France
| | - Véronique Broussolle
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France
| | - Julien Brillard
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; UMR 1333 DGIMI, INRA, Université de Montpellier Montpellier, France
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175
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Diomandé SE, Guinebretière MH, De Sarrau B, Nguyen-the C, Broussolle V, Brillard J. Fatty acid profiles and desaturase-encoding genes are different in thermo- and psychrotolerant strains of the Bacillus cereus Group. BMC Res Notes 2015; 8:329. [PMID: 26227277 PMCID: PMC4521489 DOI: 10.1186/s13104-015-1288-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 07/22/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The Bacillus cereus Group consists of closely-related bacteria, including pathogenic or harmless strains, and whose species can be positioned along the seven phylogenetic groups of Guinebretière et al. (I-VII). They exhibit different growth-temperature ranges, through thermotolerant to psychrotolerant thermotypes. Among these, B. cytotoxicus is an atypical thermotolerant and food-poisoning agent affiliated to group VII whose thermotolerance contrasts with the mesophilic and psychrotolerant thermotypes associated to the remaining groups I-VI. To understand the role of fatty acid (FA) composition in these variable thermotypes (i.e. growth behavior vs temperatures), we report specific features differentiating the FA pattern of B. cytotoxicus (group VII) from its counterparts (groups I-VI). FINDINGS The FA pattern of thermotolerant group VII (B. cytotoxicus) displayed several specific features. Most notably, we identified a high ratio of the branched-chain FAs iso-C15/iso-C13 (i15/i13) and the absence of the unsaturated FA (UFA) C16:1(5) consistent with the absence of ∆5 desaturase DesA. Conversely, phylogenetic groups II-VI were characterized by lower i15/i13 ratios and variable proportions of C16:1(5) depending on thermotype, and presence of the DesA desaturase. In mesophilic group I, thermotype seemed to be related to an atypically high amount of C16:1(10) that may involve ∆10 desaturase DesB. CONCLUSION The levels of i15/i13 ratio, C16:1(5) and C16:1(10) UFAs were related to growth temperature variations recorded between thermotypes and/or phylogenetic groups. These FA are likely to play a role in membrane fluidity and may account for the differences in temperature tolerance observed in B. cereus Group strains.
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Affiliation(s)
- Sara Esther Diomandé
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France.
| | - Marie-Hélène Guinebretière
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,INRA, UMR408 SQPOV, Site Agroparcs, 228 route de l'Aérodrome, CS40509, 84914, Avignon Cedex 9, France.
| | - Benoit De Sarrau
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Xurian Environnement, ZAE Béziers Ouest, rue du Jéroboam, 34500, Béziers, France.
| | - Christophe Nguyen-the
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France.
| | - Véronique Broussolle
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France.
| | - Julien Brillard
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000, Avignon, France. .,INRA, UMR 1333 DGIMI, Université Montpellier, 34095, Montpellier Cedex 5, France.
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176
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Three Novel Lantibiotics, Ticins A1, A3, and A4, Have Extremely Stable Properties and Are Promising Food Biopreservatives. Appl Environ Microbiol 2015; 81:6964-72. [PMID: 26231642 DOI: 10.1128/aem.01851-15] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/16/2015] [Indexed: 02/06/2023] Open
Abstract
Lantibiotics are antimicrobial peptides with potential applications as the next generation of antimicrobials in the food industry and/or the pharmaceutical industry. Nisin has successfully been used as a food preservative for over 40 years, but its major drawback is its limited stability under neutral and alkaline pH conditions. To identify alternatives with better biochemical properties, we screened more than 100 strains of the Bacillus cereus group. Three novel lantibiotics, ticins A1 (4,062.98 Da), A3 (4,048.96 Da), and A4 (4,063.02 Da), which were highly thermostable (121°C for 30 min) and extremely pH tolerant (pH 2.0 to 9.0), were identified in Bacillus thuringiensis BMB3201. They all showed potent antimicrobial activities against all tested Gram-positive bacteria and greater activities than those of nisin A against Bacillus cereus and Listeria monocytogenes, two important foodborne pathogens. These three novel lantibiotics, with their extremely stable properties and potent antimicrobial activities, have the potential for use as biopreservatives.
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177
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Isolation of Bacillus cereus Group from the Fecal Material of Endangered Wood Turtles. Curr Microbiol 2015; 71:524-7. [PMID: 26175111 DOI: 10.1007/s00284-015-0875-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
Abstract
Members of the Bacillus cereus group are opportunistic human pathogens. They can be found in a broad range of foods. Diarrheal food poisoning and/or emetic type syndromes can result from eating contaminated food. In this study, seven B. cereus group members were isolated from the fecal material of Wood Turtles (Glyptemys insculpta). The isolates were then assessed for the presence of enterotoxin genes (nheA, entFM, hblC, and cytK) using PCR. The most prevalent is the nonhemolytic enterotoxin gene which was found in all seven isolates.
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178
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Castiaux V, Liu X, Delbrassinne L, Mahillon J. Is Cytotoxin K from Bacillus cereus a bona fide enterotoxin? Int J Food Microbiol 2015; 211:79-85. [PMID: 26186121 DOI: 10.1016/j.ijfoodmicro.2015.06.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 06/20/2015] [Accepted: 06/22/2015] [Indexed: 11/19/2022]
Abstract
Cytotoxin K (CytK) produced by Bacillus cereus s.l. has generally been considered to be associated with the foodborne diarrhoeal syndrome. Two distinct variants of CytK have been reported: CytK-1 from Bacillus cytotoxicus and CytK-2 from B. cereus. In order to determine whether CytK plays a significant role in the diarrhoeal disease, the occurrence of cytK genes was assessed among 390 B. cereus isolates with different origins including clinical and food poisoning samples and was found to be 46%. Interestingly, the cytK occurrence was slightly lower in food poisoning and clinical isolates than in environmental samples. Seventy cytK-2 positive strains (including 28 isolates from foodborne outbreaks) were then selected in order to assess their genetic diversity. A genetic dendrogram based on the cytK-2 sequences of these 70 strains and on two cytK-1 sequences from strains NVH 391-98 and 883-00 showed an important diversity. However, no strain clustering according to the origin or source of isolation was observed. These observations were confirmed by Multi-Locus Sequences Typing (MLST) based on five different loci of housekeeping genes (ccpA, recF, sucC, purF and gdpD) for which no grouping of foodborne outbreak strains could be identified. Therefore, the choice of cytK as virulence factor for the diarrhoeal pathotype does not seem to be relevant per se, even though the involvement of CytK in the diarrhoeal syndrome cannot be fully excluded. Potential synergistic effects between CytK and other virulence factors, together with their potential variable expression levels should be further investigated.
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Affiliation(s)
- Virginie Castiaux
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Xiaojin Liu
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Laurence Delbrassinne
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium; Scientific Institute of Public Health, Juliette Wytsman street 14, B-1050 Brussels, Belgium
| | - Jacques Mahillon
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
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179
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Jeßberger N, Krey VM, Rademacher C, Böhm ME, Mohr AK, Ehling-Schulz M, Scherer S, Märtlbauer E. From genome to toxicity: a combinatory approach highlights the complexity of enterotoxin production in Bacillus cereus. Front Microbiol 2015; 6:560. [PMID: 26113843 PMCID: PMC4462024 DOI: 10.3389/fmicb.2015.00560] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 05/21/2015] [Indexed: 01/30/2023] Open
Abstract
In recent years Bacillus cereus has gained increasing importance as a food poisoning pathogen. It is the eponymous member of the B. cereus sensu lato group that consists of eight closely related species showing impressive diversity of their pathogenicity. The high variability of cytotoxicity and the complex regulatory network of enterotoxin expression have complicated efforts to predict the toxic potential of new B. cereus isolates. In this study, comprehensive analyses of enterotoxin gene sequences, transcription, toxin secretion and cytotoxicity were performed. For the first time, these parameters were compared in a whole set of B. cereus strains representing isolates of different origin (food or food poisoning outbreaks) and of different toxic potential (enteropathogenic and apathogenic) to elucidate potential starting points of strain-specific differential toxicity. While toxin gene sequences were highly conserved and did not allow for differentiation between high and low toxicity strains, comparison of nheB and hblD enterotoxin gene transcription and Nhe and Hbl protein titers revealed not only strain-specific differences but also incongruence between toxin gene transcripts and toxin protein levels. With one exception all strains showed comparable capability of protein secretion and so far, no secretion patterns specific for high and low toxicity strains were identified. These results indicate that enterotoxin expression is more complex than expected, possibly involving the orchestrated interplay of different transcriptional regulator proteins, as well as posttranscriptional and posttranslational regulatory mechanisms plus additional influences of environmental conditions.
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Affiliation(s)
- Nadja Jeßberger
- Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München Oberschleißheim, Germany
| | - Viktoria M Krey
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München Freising, Germany
| | - Corinna Rademacher
- Functional Microbiology, Department of Pathobiology, Institute of Microbiology, University of Veterinary Medicine Vienna Vienna, Austria
| | - Maria-Elisabeth Böhm
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München Freising, Germany
| | - Ann-Katrin Mohr
- Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München Oberschleißheim, Germany
| | - Monika Ehling-Schulz
- Functional Microbiology, Department of Pathobiology, Institute of Microbiology, University of Veterinary Medicine Vienna Vienna, Austria
| | - Siegfried Scherer
- Lehrstuhl für Mikrobielle Ökologie, Zentralinstitut für Ernährungs- und Lebensmittelforschung, Wissenschaftszentrum Weihenstephan, Technische Universität München Freising, Germany
| | - Erwin Märtlbauer
- Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität München Oberschleißheim, Germany
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180
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Chromosome-Directed PCR-Based Detection and Quantification of Bacillus cereus Group Members with Focus on B. thuringiensis Serovar israelensis Active against Nematoceran Larvae. Appl Environ Microbiol 2015; 81:4894-903. [PMID: 25979887 DOI: 10.1128/aem.00671-15] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/06/2015] [Indexed: 11/20/2022] Open
Abstract
Bacillus thuringiensis serovar israelensis is a wide-spread soil bacterium affiliated with the B. cereus group (Bcg) and is widely used in biocontrol products applied against mosquito and black fly larvae. For monitoring and quantification of applied B. thuringiensis serovar israelensis and its effect on indigenous B. thuringiensis serovar israelensis and Bcg assemblages, efficient and reliable tools are essential. The abundance and properties of B. thuringiensis serovar israelensis strains in the environment traditionally have been investigated with cultivation-dependent techniques, which are hampered by low sensitivity and the morphological similarity between B. cereus and B. thuringiensis. Currently available PCR-based detection and quantification tools target markers located on plasmids. In this study, a new cultivation-independent PCR-based method for efficient and specific quantification of B. thuringiensis serovar israelensis and Bcg is presented, utilizing two sets of PCR primers targeting the bacterial chromosome. Sequence database searches and empirical tests performed on target and nontarget species, as well as on bulk soil DNA samples, demonstrated that this diagnostic tool is specific for B. thuringiensis serovar israelensis and Bcg. The method will be useful for comparisons of Bcg and B. thuringiensis serovar israelensis abundances in the same samples. Moreover, the effect of B. thuringiensis serovar israelensis-based insecticide application on the total Bcg assemblages, including indigenous populations, can be investigated. This type of information is valuable in risk assessment and policy making for use of B. thuringiensis serovar israelensis in the environment.
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181
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Diomandé SE, Nguyen-the C, Abee T, Tempelaars MH, Broussolle V, Brillard J. Involvement of the CasK/R two-component system in optimal unsaturation of the Bacillus cereus fatty acids during low-temperature growth. Int J Food Microbiol 2015; 213:110-7. [PMID: 25987542 DOI: 10.1016/j.ijfoodmicro.2015.04.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 04/21/2015] [Accepted: 04/25/2015] [Indexed: 11/26/2022]
Abstract
Bacillus cereus sensu lato is composed of a set of ubiquitous strains including human pathogens that can survive a range of food processing conditions, grow in refrigerated food, and sometimes cause food poisoning. We previously identified the two-component system CasK/R that plays a key role in cold adaptation. To better understand the CasK/R-controlled mechanisms that support low-temperature adaptation, we performed a transcriptomic analysis on the ATCC 14579 strain and its isogenic ∆casK/R mutant grown at 12°C. Several genes involved in fatty acid (FA) metabolism were downregulated in the mutant, including desA and desB encoding FA acyl-lipid desaturases that catalyze the formation of a double-bond on the FA chain in positions ∆5 and ∆10, respectively. A lower proportion of FAs presumably unsaturated by DesA was observed in the ΔcasK/R strain compared to the parental strain while no difference was found for FAs presumably unsaturated by DesB. Addition of phospholipids from egg yolk lecithin rich in unsaturated FAs, to growth medium, abolished the cold-growth impairment of ΔcasK/R suggesting that exogenous unsaturated FAs can support membrane-level modifications and thus compensate for the decreased production of these FAs in the B. cereus ∆casK/R mutant during growth at low temperature. Our findings indicate that CasK/R is involved in the regulation of FA metabolism, and is necessary for cold adaptation of B. cereus unless an exogenous source of unsaturated FAs is available.
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Affiliation(s)
- Sara Esther Diomandé
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France
| | - Christophe Nguyen-the
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France
| | - Tjakko Abee
- Top Institute Food and Nutrition, NieuweKanaal 9A, 6709 PA, Wageningen, The Netherlands; Food Microbiology Laboratory, Wageningen University, BornseWeilanden 9, 6708 WG, Wageningen, The Netherlands
| | - Marcel H Tempelaars
- Food Microbiology Laboratory, Wageningen University, BornseWeilanden 9, 6708 WG, Wageningen, The Netherlands
| | - Véronique Broussolle
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France
| | - Julien Brillard
- INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France; Université d'Avignon, UMR408 Sécurité et Qualité des Produits d'Origine Végétale, 84000 Avignon, France; INRA, Université Montpellier, UMR1333 Diversité Génomes et Interactions Microorganismes-Insectes (DGIMI), Montpellier, France.
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182
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Drewnowska JM, Zambrzycka M, Kalska-Szostko B, Fiedoruk K, Swiecicka I. Melanin-Like Pigment Synthesis by Soil Bacillus weihenstephanensis Isolates from Northeastern Poland. PLoS One 2015; 10:e0125428. [PMID: 25909751 PMCID: PMC4409349 DOI: 10.1371/journal.pone.0125428] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 03/18/2015] [Indexed: 11/22/2022] Open
Abstract
Although melanin is known for protecting living organisms from harmful physical and chemical factors, its synthesis is rarely observed among endospore-forming Bacillus cereus sensu lato. Here, for the first time, we reported that psychrotolerant Bacillus weihenstephanensis from Northeastern Poland can produce melanin-like pigment. We assessed physicochemical properties of the pigment and the mechanism of its synthesis in relation to B. weihenstephanensis genotypic and phenotypic characteristics. Electron paramagnetic resonance (EPR) spectroscopy displayed a stable free radical signal of the pigment from environmental isolates which are consistent with the commercial melanin. Fourier transform infrared spectroscopy (FT-IR) and physicochemical tests indicated the phenolic character of the pigment. Several biochemical tests showed that melanin-like pigment synthesis by B. weihenstephanensis was associated with laccase activity. The presence of the gene encoding laccase was confirmed by the next generation whole genome sequencing of one B. weihenstephanensis strain. Biochemical (API 20E and 50CHB tests) and genetic (Multi-locus Sequence Typing, 16S rRNA sequencing, and Pulsed-Field Gel Electrophoresis) characterization of the isolates revealed their close relation to the psychrotrophic B. weihenstephanensis DSMZ 11821 reference strain. The ability to synthesize melanin-like pigment by soil B. weihenstephanensis isolates and their psychrotrophic character seemed to be a local adaptation to a specific niche. Detailed genetic and biochemical analyses of melanin-positive environmental B. weihenstephanensis strains shed some light on the evolution and ecological adaptation of these bacteria. Moreover, our study raised new biotechnological possibilities for the use of water-soluble melanin-like pigment naturally produced by B. weihenstephanensis as an alternative to commercial non-soluble pigment.
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Affiliation(s)
- Justyna M. Drewnowska
- Department of Microbiology, Institute of Biology, University of Bialystok, Bialystok, Poland
| | - Monika Zambrzycka
- Department of Microbiology, Institute of Biology, University of Bialystok, Bialystok, Poland
| | - Beata Kalska-Szostko
- Department of Physicochemical Analysis, Institute of Chemistry, University of Bialystok, Bialystok, Poland
| | - Krzysztof Fiedoruk
- Department of Microbiology, Medical University of Bialystok, Bialystok, Poland
| | - Izabela Swiecicka
- Department of Microbiology, Institute of Biology, University of Bialystok, Bialystok, Poland
- Laboratory of Applied Microbiology, University of Bialystok, Bialystok, Poland
- * E-mail:
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183
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Makart L, Gillis A, Mahillon J. pXO16 from Bacillus thuringiensis serovar israelensis: Almost 350 kb of terra incognita. Plasmid 2015; 80:8-15. [PMID: 25770691 DOI: 10.1016/j.plasmid.2015.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 02/21/2015] [Accepted: 03/03/2015] [Indexed: 11/20/2022]
Abstract
Bacillus thuringiensis strains usually harbor large sets of plasmids, some of which carrying the entomopathogenic δ-endotoxins. B. thuringiensis serovar israelensis, active on Dipteran larvae, carries the very large conjugative plasmid pXO16 (350 kb). pXO16 displays a macroscopic aggregation phenotype when liquid cultures of conjugative partners are mixed. Its conjugative apparatus is able of transferring itself and other non-conjugative and non-mobilizable plasmids in a fast and very efficient manner. Even though its conjugative kinetics and capabilities have been extensively studied, the genetic bases for this unique transfer system remain largely unknown. In this work, the sequence of pXO16 has been identified in the existing sequenced genome of B. thuringiensis sv. israelensis HD-789 as corresponding to the p01 plasmid. Despite pXO16 sequence being highly coding, few CDS possess homologs in the databases. However, potential regions responsible for the aggregation phenotype and the plasmid replication have been highlighted. The common orientation of all CDS and the presence of a high number of potential paralogs suggested a phage-like nature. Concerning conjugative functions, no significant type IV secretion system homologs have been found, indicating that pXO16 encodes an unforeseen conjugative system.
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Affiliation(s)
- Lionel Makart
- Laboratory of Food and Environmental Microbiology, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Annika Gillis
- Laboratory of Food and Environmental Microbiology, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Jacques Mahillon
- Laboratory of Food and Environmental Microbiology, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
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184
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Dréan P, McAuley CM, Moore SC, Fegan N, Fox EM. Characterization of the spore-forming Bacillus cereus sensu lato group and Clostridium perfringens bacteria isolated from the Australian dairy farm environment. BMC Microbiol 2015; 15:38. [PMID: 25881096 PMCID: PMC4336692 DOI: 10.1186/s12866-015-0377-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 02/04/2015] [Indexed: 11/10/2022] Open
Abstract
Background The Bacillus cereus sensu lato group and Clostridium perfringens are spore-forming bacteria often associated with food spoilage and which can cause emetic and diarrheal syndromes in humans and ruminants. This study characterised the phenotypes and genotypes of 50 Bacillus cereus s. l. isolates and 26 Clostridium perfringens isolates from dairy farms environments in Victoria, Australia. Results Five of the seven B. cereus s. l. species were isolated, and analysis of the population diversity using Pulsed-Field Gel Electrophoresis (PFGE) suggested that the populations are largely distinct to each farm. Enterotoxin production by representative isolates of each B. cereus s. l. species identified was typically found to be reduced in milk, compared with broth. Among the C. perfringens isolates, only two different toxin types were identified, type A and D. Bovine and ovine farms harbored only type A whereas both type A and D were found on two of the three caprine farms. Conclusions This study showed that the B. cereus s. l. populations on the sampled farms exhibit a broad diversity in both species and genotypes. The risk of toxin-induced diarrheal illness through consumption of contaminated milk may be limited, in comparison with other food matrices. Type A strains of C. perfringens were the most abundant on dairy farms in Victoria, however type D may be of concern on caprine farms as it can cause enterotoxemia in goats. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0377-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Paul Dréan
- CSIRO Food and Nutrition, 671 Sneydes Road, Werribee, VIC, 3030, Australia.
| | | | - Sean C Moore
- CSIRO Food and Nutrition, 671 Sneydes Road, Werribee, VIC, 3030, Australia.
| | - Narelle Fegan
- CSIRO Food and Nutrition, 671 Sneydes Road, Werribee, VIC, 3030, Australia.
| | - Edward M Fox
- CSIRO Food and Nutrition, 671 Sneydes Road, Werribee, VIC, 3030, Australia.
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185
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Goswami A, Roy Chowdhury A, Sarkar M, Saha SK, Paul S, Dutta C. Strand-biased gene distribution, purine assymetry and environmental factors influence protein evolution in Bacillus. FEBS Lett 2015; 589:629-38. [PMID: 25639611 DOI: 10.1016/j.febslet.2015.01.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 01/16/2015] [Accepted: 01/18/2015] [Indexed: 12/23/2022]
Abstract
A strong purine asymmetry, along with strand-biased gene distribution and the presence of PolC, prevails in Bacillus and some other members of Firmicutes, Fusobacteria and Tenericutes. The analysis of protein features in 21 Bacillus species of diverse metabolic, virulence and ecological traits revealed that purine asymmetry in conjunction with lineage/niche specific constraints significantly influences protein evolution in Bacillus. All Bacillus species, except for Se-respiring Bacillus selenitireducens, display distinct strand-specific biases in amino acid usage, which may affect the isoelectric point or surface charge distribution of proteins with prevalence of acidic and basic residues in the leading and lagging strand proteins, respectively.
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Affiliation(s)
- Aranyak Goswami
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
| | - Anindya Roy Chowdhury
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
| | - Munmun Sarkar
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
| | - Sanjoy Kumar Saha
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
| | - Sandip Paul
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
| | - Chitra Dutta
- Structural Biology & Bioinformatics Division, CSIR - Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700032, India.
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Pitt TL, McClure J, Parker MD, Amézquita A, McClure PJ. Bacillus cereus in personal care products: risk to consumers. Int J Cosmet Sci 2015; 37:165-74. [PMID: 25482451 DOI: 10.1111/ics.12191] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 11/27/2014] [Indexed: 12/17/2022]
Abstract
Bacillus cereus is ubiquitous in nature and thus occurs naturally in a wide range of raw materials and foodstuffs. B. cereus spores are resistant to desiccation and heat and able to survive dry storage and cooking. Vegetative cells produce several toxins which on ingestion in sufficient numbers can cause vomiting and/or diarrhoea depending on the toxins produced. Gastrointestinal disease is commonly associated with reheated or inadequately cooked foods. In addition to being a rare cause of several acute infections (e.g. pneumonia and septicaemia), B. cereus can also cause localized infection of post-surgical or trauma wounds and is a rare but significant pathogen of the eye where it may result in severe endophthalmitis often leading to loss of vision. Key risk factors in such cases are trauma to the eye and retained contaminated intraocular foreign bodies. In addition, rare cases of B. cereus-associated keratitis (inflammation of the cornea) have been linked to contact lens use. Bacillus cereus is therefore a microbial contaminant that could adversely affect product safety of cosmetic and facial toiletries and pose a threat to the user if other key risk factors are also present. The infective dose in the human eye is unknown, but as few as 100 cfu has been reported to initiate infection in a susceptible animal model. However, we are not aware of any reports in the literature of B. cereus infections in any body site linked with use of personal care products. Low levels of B. cereus spores may on occasion be present in near-eye cosmetics, and these products have been used by consumers for many years. In addition, exposure to B. cereus is more likely to occur through other routes (e.g. dustborne contamination) due to its ubiquity and resistance properties of spores. The organism has been recovered from the eyes of healthy individuals. Therefore, although there may be a perceived hazard, the risk of severe eye infections as a consequence of exposure through contaminated near-eye cosmetics is judged to be vanishingly small. It is unlikely that more stringent microbiological standards for near-eye cosmetics will have any impact on the risk of severe eye infections caused by B. cereus, as these are not linked to use of personal care products.
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Affiliation(s)
- T L Pitt
- 712 Kenton Lane, Harrow, Middlesex, HA3 6AB, UK
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187
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Zheng J, Guan Z, Cao S, Peng D, Ruan L, Jiang D, Sun M. Plasmids are vectors for redundant chromosomal genes in the Bacillus cereus group. BMC Genomics 2015; 16:6. [PMID: 25608745 PMCID: PMC4326196 DOI: 10.1186/s12864-014-1206-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 12/24/2014] [Indexed: 01/12/2023] Open
Abstract
Background Prokaryotic plasmids have played significant roles in the evolution of bacterial genomes and have a great impact on the metabolic functions of the host cell. Many bacterial strains contain multiple plasmids, but the relationships between bacterial plasmids and chromosomes are unclear. We focused on plasmids from the Bacillus cereus group because most strains contain several plasmids. Results We collected the genome sequences of 104 plasmids and 20 chromosomes from B. cereus group strains, and we studied the relationships between plasmids and chromosomes by focusing on the pan-genomes of these plasmids and chromosomes. In terms of basic features (base composition and codon usage), the genes on plasmids were more similar to the chromosomal variable genes (distributed genes and unique genes) than to the chromosomal core genes. Although all the functional categories of the chromosomal genes were exhibited by the plasmid genes, the proportions of each category differed between these two gene sets. The 598 gene families shared between chromosomes and plasmids displayed a uniform distribution between the two groups. A phylogenetic analysis of the shared genes, including the chromosomal core gene set, indicated that gene exchange events between plasmids and chromosomes occurred frequently during the evolutionary histories of the strains and species in this group. Moreover, the shared genes between plasmids and chromosomes usually had different promoter and terminator sequences, suggesting that they are regulated by different elements at the transcriptional level. Conclusions We speculate that for the entire B. cereus group, adaptive genes are preserved on both plasmids and chromosomes; however, in a single cell, homologous genes on plasmids and the chromosome are controlled by different regulators to reduce the burden of maintaining redundant genes. Electronic supplementary material The online version of this article (doi:10.1186/s12864-014-1206-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jinshui Zheng
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Ziyu Guan
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Shiyun Cao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Donghai Peng
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Lifang Ruan
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Daohong Jiang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Ming Sun
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China.
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188
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The Bacillus cereus group is an excellent reservoir of novel lanthipeptides. Appl Environ Microbiol 2014; 81:1765-74. [PMID: 25548056 DOI: 10.1128/aem.03758-14] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Lantibiotics are ribosomally synthesized peptides that contain multiple posttranslational modifications. Research on lantibiotics has increased recently, mainly due to their broad-spectrum antimicrobial activity, especially against some clinical Gram-positive pathogens. Many reports about various bacteriocins in the Bacillus cereus group have been published, but few were about lantibiotics. In this study, we identified 101 putative lanthipeptide gene clusters from 77 out of 223 strains of this group, and these gene clusters were further classified into 20 types according to their gene organization and the homologies of their functional genes. Among them, 18 types were novel and have not yet been experimentally verified. Two novel lantibiotics (thuricin 4A-4 and its derivative, thuricin 4A-4D) were identified in the type I-1 lanthipeptide gene cluster and showed activity against all tested Gram-positive bacteria. The mode of action of thuricin 4A-4 was studied, and we found that it acted as a bactericidal compound. The transcriptional analysis of four structural genes (thiA1, thiA2, thiA3, and thiA4) in the thuricin 4A gene cluster showed that only one structural gene, thiA4, showed efficient transcription in the exponential growth phase; the other three structural genes did not. In addition, the putative transmembrane protein ThiI was responsible for thuricin 4A-4 immunity. Genome analysis and functional verification illustrated that B. cereus group strains were a prolific source of novel lantibiotics.
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189
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Kinetic study of Bacillus cereus spore inactivation by high pressure high temperature treatment. INNOV FOOD SCI EMERG 2014. [DOI: 10.1016/j.ifset.2014.07.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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190
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Thorsen L, Kando CK, Sawadogo H, Larsen N, Diawara B, Ouédraogo GA, Hendriksen NB, Jespersen L. Characteristics and phylogeny of Bacillus cereus strains isolated from Maari, a traditional West African food condiment. Int J Food Microbiol 2014; 196:70-8. [PMID: 25528535 DOI: 10.1016/j.ijfoodmicro.2014.11.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 11/10/2014] [Accepted: 11/24/2014] [Indexed: 10/24/2022]
Abstract
Maari is a spontaneously fermented food condiment made from baobab tree seeds in West African countries. This type of product is considered to be safe, being consumed by millions of people on a daily basis. However, due to the spontaneous nature of the fermentation the human pathogen Bacillus cereus occasionally occurs in Maari. This study characterizes succession patterns and pathogenic potential of B. cereus isolated from the raw materials (ash, water from a drilled well (DW) and potash), seed mash throughout fermentation (0-96h), after steam cooking and sun drying (final product) from two production sites of Maari. Aerobic mesophilic bacterial (AMB) counts in raw materials were of 10(5)cfu/ml in DW, and ranged between 6.5×10(3) and 1.2×10(4)cfu/g in potash, 10(9)-10(10)cfu/g in seed mash during fermentation and 10(7) - 10(9) after sun drying. Fifty three out of total 290 AMB isolates were identified as B. cereus sensu lato by use of ITS-PCR and grouped into 3 groups using PCR fingerprinting based on Escherichia coli phage-M13 primer (M13-PCR). As determined by panC gene sequencing, the isolates of B. cereus belonged to PanC types III and IV with potential for high cytotoxicity. Phylogenetic analysis of concatenated sequences of glpF, gmk, ilvD, pta, pur, pycA and tpi revealed that the M13-PCR group 1 isolates were related to B. cereus biovar anthracis CI, while the M13-PCR group 2 isolates were identical to cereulide (emetic toxin) producing B. cereus strains. The M13-PCR group 1 isolates harboured poly-γ-D-glutamic acid capsule biosynthesis genes capA, capB and capC showing 99-100% identity with the environmental B. cereus isolate 03BB108. Presence of cesB of the cereulide synthetase gene cluster was confirmed by PCR in M13-PCR group 2 isolates. The B. cereus harbouring the cap genes were found in potash, DW, cooking water and at 8h fermentation. The "emetic" type B. cereus were present in DW, the seed mash at 48-72h of fermentation and in the final product, while the remaining isolates (PanC type IV) were detected in ash, at 48-72h fermentation and in the final product. This work sheds light on the succession and pathogenic potential of B. cereus species in traditional West African food condiment and clarifies their phylogenetic relatedness to B. cereus biovar anthracis. Future implementation of GMP and HACCP and development of starter cultures for controlled Maari fermentations will help to ensure a safe product.
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Affiliation(s)
- Line Thorsen
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Christine Kere Kando
- Food Technology Department (DTA/IRSAT/CNRST), Ouagadougou 03 BP 7047, Burkina Faso; Université Polytechnique de Bobo-Dioulasso, 01 BP 1091 Bobo-Dioulasso, Burkina Faso
| | - Hagrétou Sawadogo
- Food Technology Department (DTA/IRSAT/CNRST), Ouagadougou 03 BP 7047, Burkina Faso
| | - Nadja Larsen
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Bréhima Diawara
- Food Technology Department (DTA/IRSAT/CNRST), Ouagadougou 03 BP 7047, Burkina Faso
| | | | - Niels Bohse Hendriksen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Lene Jespersen
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark.
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191
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Celandroni F, Salvetti S, Senesi S, Ghelardi E. Bacillus thuringiensis membrane-damaging toxins acting on mammalian cells. FEMS Microbiol Lett 2014; 361:95-103. [PMID: 25283838 DOI: 10.1111/1574-6968.12615] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 09/26/2014] [Accepted: 09/29/2014] [Indexed: 01/20/2023] Open
Abstract
Bacillus thuringiensis is widely used as a biopesticide in forestry and agriculture, being able to produce potent species-specific insecticidal toxins and considered nonpathogenic to other animals. More recently, however, repeated observations are documenting the association of this microorganism with various infectious diseases in humans, such as food-poisoning-associated diarrheas, periodontitis, bacteremia, as well as ocular, burn, and wound infections. Similar to B. cereus, B. thuringiensis produces an array of virulence factors acting against mammalian cells, such as phosphatidylcholine- and phosphatidylinositol-specific phospholipase C (PC-PLC and PI-PLC), hemolysins, in particular hemolysin BL (HBL), and various enterotoxins. The contribution of some of these toxins to B. thuringiensis pathogenicity has been studied in animal models of infection, following intravitreous, intranasal, or intratracheal inoculation. These studies lead to the speculation that the activities of PC-PLC, PI-PLC, and HBL are responsible for most of the pathogenic properties of B. thuringiensis in nongastrointestinal infections in mammals. This review summarizes data regarding the biological activity, the genetic basis, and the structural features of these membrane-damaging toxins.
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Affiliation(s)
- Francesco Celandroni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
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192
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Luu-Thi H, Khadka DB, Michiels CW. Thermal inactivation parameters of spores from different phylogenetic groups of Bacillus cereus. Int J Food Microbiol 2014; 189:183-8. [DOI: 10.1016/j.ijfoodmicro.2014.07.027] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 05/09/2014] [Accepted: 07/21/2014] [Indexed: 11/17/2022]
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193
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Abstract
ABSTRACT
The family
Bacillaceae
constitutes a phenotypically diverse and globally ubiquitous assemblage of bacteria. Investigation into how evolution has shaped, and continues to shape, this family has relied on several widely ranging approaches from classical taxonomy, ecological field studies, and evolution in soil microcosms to genomic-scale phylogenetics, laboratory, and directed evolution experiments. One unifying characteristic of the
Bacillaceae
, the endospore, poses unique challenges to answering questions regarding both the calculation of evolutionary rates and claims of extreme longevity in ancient environmental samples.
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194
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Chaabouni I, Barkallah I, Hamdi C, Jouini A, Saidi M, Mahillon J, Cherif A. Metabolic capacities and toxigenic potential as key drivers of Bacillus cereus ubiquity and adaptation. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-0941-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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195
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Abbas AA, Planchon S, Jobin M, Schmitt P. Absence of oxygen affects the capacity to sporulate and the spore properties of Bacillus cereus. Food Microbiol 2014; 42:122-31. [DOI: 10.1016/j.fm.2014.03.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 01/28/2014] [Accepted: 03/06/2014] [Indexed: 11/16/2022]
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196
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Isolation and characterization of an endophytic bacterium, Bacillus megaterium BMN1, associated with root-nodules of Medicago sativa L. growing in Al-Ahsaa region, Saudi Arabia. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-0946-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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197
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Gillis A, Mahillon J. Phages preying on Bacillus anthracis, Bacillus cereus, and Bacillus thuringiensis: past, present and future. Viruses 2014; 6:2623-72. [PMID: 25010767 PMCID: PMC4113786 DOI: 10.3390/v6072623] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 05/19/2014] [Accepted: 06/18/2014] [Indexed: 01/18/2023] Open
Abstract
Many bacteriophages (phages) have been widely studied due to their major role in virulence evolution of bacterial pathogens. However, less attention has been paid to phages preying on bacteria from the Bacillus cereus group and their contribution to the bacterial genetic pool has been disregarded. Therefore, this review brings together the main information for the B. cereus group phages, from their discovery to their modern biotechnological applications. A special focus is given to phages infecting Bacillus anthracis, B. cereus and Bacillus thuringiensis. These phages belong to the Myoviridae, Siphoviridae, Podoviridae and Tectiviridae families. For the sake of clarity, several phage categories have been made according to significant characteristics such as lifestyles and lysogenic states. The main categories comprise the transducing phages, phages with a chromosomal or plasmidial prophage state, γ-like phages and jumbo-phages. The current genomic characterization of some of these phages is also addressed throughout this work and some promising applications are discussed here.
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Affiliation(s)
- Annika Gillis
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, Croix du Sud 2, L7.05.12, B-1348 Louvain-la-Neuve, Belgium.
| | - Jacques Mahillon
- Laboratory of Food and Environmental Microbiology, Université catholique de Louvain, Croix du Sud 2, L7.05.12, B-1348 Louvain-la-Neuve, Belgium.
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198
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Blackburn MB, Martin PAW, Kuhar D, Farrar RR, Gundersen-Rindal DE. Crystalliferous Bacillus cereus group bacteria from a Maryland hardwood forest are dominated by psychrotolerant strains. Microbiologyopen 2014; 3:578-84. [PMID: 24985699 PMCID: PMC4287184 DOI: 10.1002/mbo3.189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 05/09/2014] [Accepted: 05/26/2014] [Indexed: 11/17/2022] Open
Abstract
Crystal-forming bacteria of the Bacillus cereus group were isolated from soil samples collected at different elevations within a mixed hardwood forest in central Maryland, and their phylogenetic relationships determined by multilocus sequence analysis. The vast majority of isolates obtained were associated with two phylogenetic groups known to be psychrotolerant, with very few isolates representing phylogenetic groups more typically associated with Bacillus thuringiensis. Isolates from the psychrotolerant groups were found to grow on solid media at 7°C. Isolates of 11 highly related, novel sequence types (STs) from the psychrotolerant group that includes Bacillus weihenstephanensis were generally found at higher elevations, and were not associated with soils near streams. Isolates of two related STs from the second psychrotolerant group were nearly always found at the bottoms of ravines near streams, in areas abundant in earthworm castings.
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Affiliation(s)
- Michael B Blackburn
- Invasive Insect Biocontrol and Behavior Laboratory, USDA/ARS, Beltsville, Maryland, 20705
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199
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Gillis A, Mahillon J. Prevalence, genetic diversity, and host range of tectiviruses among members of the Bacillus cereus group. Appl Environ Microbiol 2014; 80:4138-52. [PMID: 24795369 PMCID: PMC4068676 DOI: 10.1128/aem.00912-14] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Accepted: 04/25/2014] [Indexed: 11/20/2022] Open
Abstract
GIL01, Bam35, GIL16, AP50, and Wip1 are tectiviruses preying on the Bacillus cereus group. Despite the significant contributions of phages in different biological processes, little is known about the dealings taking place between tectiviruses and their Gram-positive bacterial hosts. Therefore, this work focuses on characterizing the interactions between tectiviruses and the B. cereus group by assessing their occurrence and genetic diversity and evaluating their host range. To study the occurrence of tectiviruses in the B. cereus group, 2,000 isolates were evaluated using primers designed to be specific to two variable regions detected in previously described elements. PCR and propagation tests revealed that tectivirus-like elements occurred in less than 3% of the isolates. Regardless of this limited distribution, several novel tectiviruses were found, and partial DNA sequencing indicated that a greater diversity exists within the family Tectiviridae. Analyses of the selected variable regions, along with their host range, showed that tectiviruses in the B. cereus group can be clustered mainly into two different groups: the ones infecting B. anthracis and those isolated from other B. cereus group members. In order to address the host range of some novel tectiviruses, 120 strains were tested for sensitivity. The results showed that all the tested tectiviruses produced lysis in at least one B. cereus sensu lato strain. Moreover, no simple relationship between the infection patterns of the tectiviruses and their diversity was found.
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Affiliation(s)
- Annika Gillis
- Laboratory of Food and Environmental Microbiology, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Jacques Mahillon
- Laboratory of Food and Environmental Microbiology, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
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200
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Prevalence and characterization of Bacillus cereus group from various marketed dairy products in India. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s13594-014-0174-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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