Journal ArticleDOI
The autolytic phenotype of the Bacillus cereus group
Noura Raddadi,Ameur Cherif,Diego Mora,Lorenzo Brusetti,Sara Borin,Abdellatif Boudabous,Daniele Daffonchio +6 more
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TLDR
To determine the autolytic phenotype of five species in the Bacillus cereus group, the objective was to establish an experimental procedure and show clear results that unequivocally can be assigned as autolysis of Bacillus species.Abstract:
Aim: To determine the autolytic phenotype of five species in the Bacillus cereus group.
Methods and Results: The autolytic rate of 96 strains belonging to five species in the B. cereus group was examined under starvation conditions at pH 6, 6·5 and 8·5 in different buffers. The autolytic rate was strain-dependent with a wide variability at pH 6, but higher and more uniform at pH 6·5. At pH 8·5, and respect to the extent of autolysis at pH 6·5, it was relatively low for most of the strains with the lowest values between 13 and 52% in Bacillus mycoides and Bacillus pseudomycoides. Peptidoglycan hydrolase patterns evaluated by renaturing sodium dodecyl sulfate-polyacrylamide gel electrophoresis using cells of Bacillus thuringiensis ssp. tolworthi HD125 as an indicator, revealed complex profiles with lytic bands of about 90, 63, 46, 41, 38, 32, 28 and 25 kDa in B. cereus, B. thuringiensis and Bacillus weihenstephanensis. Bacillus mycoides and B. pseudomycoides had simpler profiles with lytic bands of 63, 46 and 38 kDa. Changes in the autolytic pattern were observed for cells harvested at the stationary phase of growth (72 h) showing an increase in the intensity of the 25 kDa band in the case of B. cereus, B. thuringiensis and B. weihenstephanensis, while no changes were observed for B. mycoides. Using Micrococcus lysodeicticus and Listeria monocytogenes as indicators lytic activity was retained by proteins of 63, 46, 38, 32 and 25 kDa and a new one of about 20 kDa in B. mycoides. Growth in the different media did not affect the autolytic pattern. NaCl abolished the activity of all the peptidoglycan hydrolases except for those of B. mycoides and B. weihenstephanensis. Lytic activity was retained in the presence of MgCl2, MnCl2 and EDTA and increased at basic pH.
Conclusions: Bacillus cereus/B. thuringiensis/B. weihenstephanensis showed a high extent of autolysis around neutral pH, even though they presented relatively complex autolysin profiles at alkaline pH. Bacillus mycoides/B. pseudomycoides had a higher extent of autolysis at acidic pH and a simpler autolysin pattern.
Significance and Impact of the Study: Information on the autolytic phenotype expand the phenotypic characterization of the different species in the B. cereus group.read more
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Screening of plant growth promoting traits ofBacillus thuringiensis
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Characterization of polyvalent and safe Bacillus thuringiensis strains with potential use for biocontrol.
Noura Raddadi,Abir Belaouis,Isabella Tamagnini,Bjarne Munk Hansen,Niels Bohse Hendriksen,Abdellatif Boudabous,Ameur Cherif,Daniele Daffonchio +7 more
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Bacillus thuringiensis beyond insect biocontrol: plant growth promotion and biosafety of polyvalent strains
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Surface display of heterologous proteins in Bacillus thuringiensis using a peptidoglycan hydrolase anchor
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Proteomics identifies Bacillus cereus EntD as a pivotal protein for the production of numerous virulence factors.
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References
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Journal ArticleDOI
Bacillus thuringiensis and Its Pesticidal Crystal Proteins
E. Schnepf,Neil Crickmore,J. Van Rie,Didier Lereclus,J. Baum,Jerald S. Feitelson,Daniel R. Zeigler,Donald H. Dean +7 more
TL;DR: Researchers are reporting promising results in engineering more-useful toxins and formulations, in creating transgenic plants that express pesticidal activity, and in constructing integrated management strategies to insure that these products are utilized with maximum efficiency and benefit.
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Phosphate solubilizing bacteria and their role in plant growth promotion
Hilda Rodríguez,Reynaldo Fraga +1 more
TL;DR: Genetic manipulation of phosphate-solubilizing bacteria to improve their ability to improve plant growth may include cloning genes involved in both mineral and organic phosphate solubilization, followed by their expression in selected rhizobacterial strains.
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Genome sequence of Bacillus cereus and comparative analysis with Bacillus anthracis
Natalia Ivanova,Alexei Sorokin,Iain Anderson,Nathalie Galleron,Benjamin Candelon,Vinayak Kapatral,Anamitra Bhattacharyya,Gary Reznik,Natalia Mikhailova,Alla Lapidus,Lien Chu,Michael Mazur,Eugene Goltsman,Niels Bent Larsen,Mark D'Souza,Theresa L. Walunas,Yuri Grechkin,Gordon D. Pusch,Robert Haselkorn,Michael Fonstein,S. Dusko Ehrlich,Ross Overbeek,Nikos C. Kyrpides +22 more
TL;DR: The sequencing and analysis of the type strain B. cereus ATCC 14579 together with the gapped genome of B. anthracis A2012 enables the comparative analysis to clarify the phylogeny of the cereus group, and the latter to determine plasmid-independent species-specific markers.
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The genome sequence of Bacillus anthracis Ames and comparison to closely related bacteria
Timothy D. Read,Timothy D. Read,Scott N. Peterson,Scott N. Peterson,Nicolas J. Tourasse,Les Baillie,Les Baillie,Ian T. Paulsen,Ian T. Paulsen,Karen E. Nelson,Hervé Tettelin,Derrick E. Fouts,Jonathan A. Eisen,Jonathan A. Eisen,Steven R. Gill,Erik Holtzapple,Ole Andreas Økstad,Erlendur Helgason,Jennifer Rilstone,Martin Wu,James F. Kolonay,Maureen J. Beanan,Robert J. Dodson,Lauren M. Brinkac,Michelle L. Gwinn,Robert T. DeBoy,Ramana Madpu,Sean C. Daugherty,A. Scott Durkin,Daniel H. Haft,William C. Nelson,Jeremy Peterson,Mihai Pop,Hoda Khouri,Diana Radune,Jonathan L. Benton,Yasmin Mahamoud,Lingxia Jiang,Ioana R. Hance,Janice Weidman,Kristi Berry,Roger D. Plaut,Alex M. Wolf,Kisha Watkins,William C. Nierman,Alyson Hazen,Robin T. Cline,Caroline Redmond,Joanne Elizabeth Thwaite,Owen White,Steven L. Salzberg,Steven L. Salzberg,Brendan Thomason,Arthur M. Friedlander,Theresa M. Koehler,Philip C. Hanna,Anne-Brit Kolstø,Claire M. Fraser,Claire M. Fraser +58 more
TL;DR: Several chromosomally encoded proteins that may contribute to pathogenicity—including haemolysins, phospholipases and iron acquisition functions—and numerous surface proteins that might be important targets for vaccines and drugs are found.
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Bacillus cereus and its food poisoning toxins
Per Einar Granum,Terje Lund +1 more
TL;DR: Bacillus cereus is becoming one of the more important causes of food poisoning in the industrialised world and produces one emetic toxin and three different enterotoxins, which consist of three different proteins that act together.
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