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Boutonnet C, Ginies C, Alpha-Bazin B, Armengaud J, Château A, Duport C. S-layer is a key element in metabolic response and entry into the stationary phase in Bacillus cereus AH187. J Proteomics 2023; 289:105007. [PMID: 37730087 DOI: 10.1016/j.jprot.2023.105007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 08/21/2023] [Accepted: 09/14/2023] [Indexed: 09/22/2023]
Abstract
Bacillus cereus is a food-borne Gram-positive pathogen. The emetic reference strain B. cereus AH187 is surrounded by a proteinaceous surface layer (S-layer) that contributes to its physico-chemical surface properties, and promotes its adhesion in response to starvation conditions. The S-layer produced by B. cereus AH187 is composed of two proteins, SL2 and EA1, which are incorporated at different growth stages. Here, we showed that deletion of the genes encoding SL2 and EA1 produced viable cells, but decreased the glucose uptake rate at the start of growth, and induced extensive reorganization of the cellular and exoproteomes upon entry into the stationary phase. As a consequence, stationary cells were less resistant to abiotic stress. Taken together, our data indicate that the S-layer is crucial but comes at a metabolic cost that modulates the stationary phase response. SIGNIFICANCE: The emetic strains of Bacillus cereus are known to cause severe food poisoning, making it crucial to understand the factors contributing to their selective enrichment in foods. Most emetic strains are surrounded by a crystalline S-layer, which is a costly protein structure to produce. In this study, we used high-throughput proteomics to investigate how S-layer synthesis affects the allocation of cellular resources in the emetic B. cereus strain AH187. Our results demonstrate that the synthesis of the S-layer plays a crucial role in the pathogen's ability to thrive under stationary growth phase conditions by modulating the stress response, thereby promoting its lifestyle as an emetic pathogen. We conclude that the synthesis of the S-layer is a critical adaptation for emetic B. cereus to successfully colonize specific niches.
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Affiliation(s)
| | | | - Béatrice Alpha-Bazin
- Université Paris Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SPI, 30200 Bagnols-sur-Cèze, France
| | - Jean Armengaud
- Université Paris Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SPI, 30200 Bagnols-sur-Cèze, France
| | - Alice Château
- Avignon Université, INRAE, UMR SQPOV, F-84914 Avignon, France
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Gandhi D, Chanalia P, Bansal P, Dhanda S. Peptidoglycan Hydrolases of Probiotic Pediococcus acidilactici NCDC 252: Isolation, Physicochemical and In Silico Characterization. Int J Pept Res Ther 2020. [DOI: 10.1007/s10989-019-10008-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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3
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Draft Genome Sequence of Bacillus cereus ET31, Isolated from an Extreme Environment. Microbiol Resour Announc 2019; 8:8/45/e01061-19. [PMID: 31699761 PMCID: PMC6838619 DOI: 10.1128/mra.01061-19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacillus cereus is a Gram‐positive, widely distributed bacterium that has a high level of metabolite production. Here, we report the draft genome sequence of a B. cereus strain exhibiting high and diverse hydrolytic potential that was isolated from glacial water samples from Svalbard, Norway. Bacillus cereus is a Gram‐positive, widely distributed bacterium that has a high level of metabolite production. Here, we report the draft genome sequence of a B. cereus strain exhibiting high and diverse hydrolytic potential that was isolated from glacial water samples from Svalbard, Norway.
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Ouertani A, Chaabouni I, Mosbah A, Long J, Barakat M, Mansuelle P, Mghirbi O, Najjari A, Ouzari HI, Masmoudi AS, Maresca M, Ortet P, Gigmes D, Mabrouk K, Cherif A. Two New Secreted Proteases Generate a Casein-Derived Antimicrobial Peptide in Bacillus cereus Food Born Isolate Leading to Bacterial Competition in Milk. Front Microbiol 2018; 9:1148. [PMID: 29915567 PMCID: PMC5994558 DOI: 10.3389/fmicb.2018.01148] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 05/14/2018] [Indexed: 02/05/2023] Open
Abstract
Milk and dairy products harbor a wide variety of bacterial species that compete for both limited resources and space. Under these competitive conditions, bacteria develop specialized mechanisms to protect themselves during niche colonization and nutrient acquisition processes. The bacterial antagonism mechanisms include the production of antimicrobial agents or molecules that facilitate competitor dispersal. In the present work, a bacterial strain designated RC6 was isolated from Ricotta and identified as Bacillus cereus. It generates antimicrobial peptide (AMP) when grown in the presence of casein. The AMP was active against several species of Bacillus and Listeria monocytogenes. MALDI-TOF analysis of the RP-HPLC purified fractions and amino acid sequencing revealed a molecular mass of 751 Da comprised of a 6-residue sequence, YPVEPF. BLAST analysis showed that the AMP corresponds to the fractions 114-119 of bovine β-casein and represents the product of a specific proteolysis. Analysis of the purified proteolytic fractions from the B. cereus RC6 culture supernatant indicated that the presence of at least two different endoproteases is crucial for the generation of the AMP. Indeed, we were able to identify two new candidate endoproteases by means of genome sequencing and functional assignment using a 3D structural model and molecular docking of misannotated hypothetical proteins. In this light, the capacity of B. cereus RC6 to generate antimicrobial peptides from casein, through the production of extracellular enzymes, presents a new model of antagonistic competition leading to niche colonization. Hence, as a dairy product contaminant, this strategy may enable proteolytic B. cereus RC6 niche specialization in milk matrices.
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Affiliation(s)
- Awatef Ouertani
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
- Aix Marseille University, Centre National de la Recherche Scientifique, ICR UMR 7273, Marseille, France
| | - Ines Chaabouni
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
| | - Amor Mosbah
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
| | - Justine Long
- Aix-Marseille University, CEA, Centre National de la Recherche Scientifique, LEMiRE, UMR 7265, BIAM, Saint-Paul-lez-Durance, France
| | - Mohamed Barakat
- Aix-Marseille University, CEA, Centre National de la Recherche Scientifique, LEMiRE, UMR 7265, BIAM, Saint-Paul-lez-Durance, France
| | - Pascal Mansuelle
- Aix Marseille Univ, Centre National de la Recherche Scientifique, IMM, Plate-Forme Protéomique, MaP IBiSA Labelled, Marseille, France
| | - Olfa Mghirbi
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
- Aix Marseille University, Centre National de la Recherche Scientifique, ICR UMR 7273, Marseille, France
| | - Afef Najjari
- Université Tunis El Manar, FST, LMBA (LR03ES03), Campus Universitaire, Tunis, Tunisia
| | - Hadda-Imene Ouzari
- Université Tunis El Manar, FST, LMBA (LR03ES03), Campus Universitaire, Tunis, Tunisia
| | - Ahmed S. Masmoudi
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
| | - Marc Maresca
- Aix-Marseille University, Centre National de la Recherche Scientifique, Centrale Marseille, iSm2, Marseille, France
| | - Philippe Ortet
- Aix-Marseille University, CEA, Centre National de la Recherche Scientifique, LEMiRE, UMR 7265, BIAM, Saint-Paul-lez-Durance, France
| | - Didier Gigmes
- Aix Marseille University, Centre National de la Recherche Scientifique, ICR UMR 7273, Marseille, France
| | - Kamel Mabrouk
- Aix Marseille University, Centre National de la Recherche Scientifique, ICR UMR 7273, Marseille, France
| | - Ameur Cherif
- Université de la Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, Ariana, Tunisia
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The CodY-dependent clhAB2 operon is involved in cell shape, chaining and autolysis in Bacillus cereus ATCC 14579. PLoS One 2017; 12:e0184975. [PMID: 28991912 PMCID: PMC5633148 DOI: 10.1371/journal.pone.0184975] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 09/05/2017] [Indexed: 11/19/2022] Open
Abstract
The Gram-positive pathogen Bacillus cereus is able to grow in chains of rod-shaped cells, but the regulation of chaining remains largely unknown. Here, we observe that glucose-grown cells of B. cereus ATCC 14579 form longer chains than those grown in the absence of glucose during the late exponential and transition growth phases, and identify that the clhAB2 operon is required for this chain lengthening phenotype. The clhAB2 operon is specific to the B. cereus group (i.e., B. thuringiensis, B. anthracis and B. cereus) and encodes two membrane proteins of unknown function, which are homologous to the Staphylococcus aureus CidA and CidB proteins involved in cell death control within glucose-grown cells. A deletion mutant (ΔclhAB2) was constructed and our quantitative image analyses show that ΔclhAB2 cells formed abnormal short chains regardless of the presence of glucose. We also found that glucose-grown cells of ΔclhAB2 were significantly wider than wild-type cells (1.47 μm ±CI95% 0.04 vs 1.19 μm ±CI95% 0.03, respectively), suggesting an alteration of the bacterial cell wall. Remarkably, ΔclhAB2 cells showed accelerated autolysis under autolysis-inducing conditions, compared to wild-type cells. Overall, our data suggest that the B. cereus clhAB2 operon modulates peptidoglycan hydrolase activity, which is required for proper cell shape and chain length during cell growth, and down-regulates autolysin activity. Lastly, we studied the transcription of clhAB2 using a lacZ transcriptional reporter in wild-type, ccpA and codY deletion-mutant strains. We found that the global transcriptional regulatory protein CodY is required for the basal level of clhAB2 expression under all conditions tested, including the transition growth phase while CcpA, the major global carbon regulator, is needed for the high-level expression of clhAB2 in glucose-grown cells.
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Najjari A, Amairi H, Chaillou S, Mora D, Boudabous A, Zagorec M, Ouzari H. Phenotypic and genotypic characterization of peptidoglycan hydrolases of Lactobacillus sakei. J Adv Res 2016; 7:155-63. [PMID: 26843981 PMCID: PMC4703478 DOI: 10.1016/j.jare.2015.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 04/09/2015] [Accepted: 04/10/2015] [Indexed: 11/26/2022] Open
Abstract
Lactobacillus sakei, a lactic acid bacterium naturally found in fresh meat and sea products, is considered to be one of the most important bacterial species involved in meat fermentation and bio-preservation. Several enzymes of Lb. sakei species contributing to microbial safeguarding and organoleptic properties of fermented-meat were studied. However, the specific autolytic mechanisms and associated enzymes involved in Lb. sakei are not well understood. The autolytic phenotype of 22 Lb. sakei strains isolated from Tunisian meat and seafood products was evaluated under starvation conditions, at pH 6.5 and 8.5, and in the presence of different carbon sources. A higher autolytic rate was observed when cells were grown in the presence of glucose and incubated at pH 6.5. Almost all strains showed high resistance to mutanolysin, indicating a minor role of muramidases in Lb. sakei cell lysis. Using Micrococcus lysodeikticus cells as a substrate in activity gels zymogram, peptidoglycan hydrolase (PGH) patterns for all strains was characterized by two lytic bands of ∼80 (B1) and ∼70 kDa (B2), except for strain BMG.167 which harbored two activity signals at a lower MW. Lytic activity was retained in high salt and in acid/basic conditions and was active toward cells of Lb. sakei, Listeria monocytogenes, Listeria ivanovii and Listeria innocua. Analysis of five putative PGH genes found in the Lb. sakei 23 K model strain genome, indicated that one gene, lsa1437, could encode a PGH (N-acetylmuramoyl-L-alanine amidase) containing B1 and B2 as isoforms. According to this hypothesis, strain BMG.167 showed an allelic version of lsa1437 gene deleted of one of the five LysM domains, leading to a reduction in the MW of lytic bands and the high autolytic rate of this strain. Characterization of autolytic phenotype of Lb. sakei should expand the knowledge of their role in fermentation processes where they represent the dominant species.
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Affiliation(s)
- Afef Najjari
- Université Tunis El Manar, Faculté des Sciences de Tunis, LR03ES03 Laboratoire de Microbiologie et Biomolécules Actives, Campus Universitaire, 2092 Tunis, Tunisia
| | - Houda Amairi
- Université Tunis El Manar, Faculté des Sciences de Tunis, LR03ES03 Laboratoire de Microbiologie et Biomolécules Actives, Campus Universitaire, 2092 Tunis, Tunisia
| | - Stéphane Chaillou
- Unité Flore Lactique et Environnement Carné, UR309, INRA, Domaine de Vilvert, F-78350 Jouy en Josas, France
| | - Diego Mora
- Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Università degli Studi di Milano, Milan, Italy
| | - Abdellatif Boudabous
- Université Tunis El Manar, Faculté des Sciences de Tunis, LR03ES03 Laboratoire de Microbiologie et Biomolécules Actives, Campus Universitaire, 2092 Tunis, Tunisia
| | - Monique Zagorec
- Unité Flore Lactique et Environnement Carné, UR309, INRA, Domaine de Vilvert, F-78350 Jouy en Josas, France
| | - Hadda Ouzari
- Université Tunis El Manar, Faculté des Sciences de Tunis, LR03ES03 Laboratoire de Microbiologie et Biomolécules Actives, Campus Universitaire, 2092 Tunis, Tunisia
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Omer H, Alpha-Bazin B, Brunet JL, Armengaud J, Duport C. Proteomics identifies Bacillus cereus EntD as a pivotal protein for the production of numerous virulence factors. Front Microbiol 2015; 6:1004. [PMID: 26500610 PMCID: PMC4595770 DOI: 10.3389/fmicb.2015.01004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 09/07/2015] [Indexed: 11/13/2022] Open
Abstract
Bacillus cereus is a Gram-positive pathogen that causes a wide variety of diseases in humans. It secretes into the extracellular milieu proteins that may contribute directly or indirectly to its virulence. EntD is a novel exoprotein identified by proteogenomics of B. cereus ATCC 14579. We constructed a ΔentD mutant and analyzed the impact of entD disruption on the cellular proteome and exoproteome isolated from early, late, and stationary-phase cultures. We identified 308 and 79 proteins regulated by EntD in the cellular proteome and the exoproteome, respectively. The contribution of these proteins to important virulence-associated functions, including central metabolism, cell structure, antioxidative ability, cell motility, and toxin production, are presented. The proteomic data were correlated with the growth defect, cell morphology change, reduced motility, and reduced cytotoxicity of the ΔentD mutant strain. We conclude that EntD is an important player in B. cereus virulence. The function of EntD and the putative EntD-dependent regulatory network are discussed. To our knowledge, this study is the first characterization of an Ent family protein in a species of the B. cereus group.
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Affiliation(s)
- Hélène Omer
- Université d'Avignon et des Pays de Vaucluse, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; CEA-Marcoule, DSV/IBITEC-S/SPI/Li2D, Laboratory "Innovative technologies for Detection and Diagnostic" Bagnols-sur-Cèze, France
| | - Béatrice Alpha-Bazin
- CEA-Marcoule, DSV/IBITEC-S/SPI/Li2D, Laboratory "Innovative technologies for Detection and Diagnostic" Bagnols-sur-Cèze, France
| | | | - Jean Armengaud
- CEA-Marcoule, DSV/IBITEC-S/SPI/Li2D, Laboratory "Innovative technologies for Detection and Diagnostic" Bagnols-sur-Cèze, France
| | - Catherine Duport
- Université d'Avignon et des Pays de Vaucluse, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France ; INRA, UMR408 Sécurité et Qualité des Produits d'Origine Végétale Avignon, France
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Vörös A, Simm R, Slamti L, McKay MJ, Hegna IK, Nielsen-LeRoux C, Hassan KA, Paulsen IT, Lereclus D, Økstad OA, Molloy MP, Kolstø AB. SecDF as part of the Sec-translocase facilitates efficient secretion of Bacillus cereus toxins and cell wall-associated proteins. PLoS One 2014; 9:e103326. [PMID: 25083861 PMCID: PMC4118872 DOI: 10.1371/journal.pone.0103326] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 06/26/2014] [Indexed: 12/25/2022] Open
Abstract
The aim of this study was to explore the role of SecDF in protein secretion in Bacillus cereus ATCC 14579 by in-depth characterization of a markerless secDF knock out mutant. Deletion of secDF resulted in pleiotropic effects characterized by a moderately slower growth rate, aberrant cell morphology, enhanced susceptibility to xenobiotics, reduced virulence and motility. Most toxins, including food poisoning-associated enterotoxins Nhe, Hbl, and cytotoxin K, as well as phospholipase C were less abundant in the secretome of the ΔsecDF mutant as determined by label-free mass spectrometry. Global transcriptome studies revealed profound transcriptional changes upon deletion of secDF indicating cell envelope stress. Interestingly, the addition of glucose enhanced the described phenotypes. This study shows that SecDF is an important part of the Sec-translocase mediating efficient secretion of virulence factors in the Gram-positive opportunistic pathogen B. cereus, and further supports the notion that B. cereus enterotoxins are secreted by the Sec-system.
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Affiliation(s)
- Aniko Vörös
- Laboratory for Microbial Dynamics (LaMDa), Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Roger Simm
- Laboratory for Microbial Dynamics (LaMDa), Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Leyla Slamti
- INRA, UMR1319 Micalis, Domaine de La Minière, Guyancourt, France
| | - Matthew J. McKay
- Australian Proteome Analysis Facility (APAF), Macquarie University, Sydney, Australia
| | - Ida K. Hegna
- Laboratory for Microbial Dynamics (LaMDa), Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Oslo, Norway
| | | | - Karl A. Hassan
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, Australia
| | - Ian T. Paulsen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, Australia
| | - Didier Lereclus
- INRA, UMR1319 Micalis, Domaine de La Minière, Guyancourt, France
- AgroParistech, UMR Micalis, Jouy-en-Josas, France
| | - Ole Andreas Økstad
- Laboratory for Microbial Dynamics (LaMDa), Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Mark P. Molloy
- Australian Proteome Analysis Facility (APAF), Macquarie University, Sydney, Australia
| | - Anne-Brit Kolstø
- Laboratory for Microbial Dynamics (LaMDa), Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Oslo, Norway
- * E-mail:
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[Analyze and compare metabolic pathways of Bacillus cereus group]. YI CHUAN = HEREDITAS 2011; 33:1057-66. [PMID: 21993280 DOI: 10.3724/sp.j.1005.2011.01057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A large number of data and information was obtained from genome sequencing and high-throughput genomic studies, use of the information to study metabolic networks become a new hotspot in biological research. This article compared different methods to reconstruct metabolic networks and analyzed the advantages and disadvantages of each methods, and then introduced some researches about carbohydrate metabolism pathways, amino acid metabolic pathways, and energy metabolism pathways of 9 strains of Bacillus cereus, 6 strains of B. anthracis,,6 strain of B. thuringiensis, and finds out their similarities and characteristics. These three strains have some necessary metabolic pathways, such as glycolysis, tri-carboxylic acid cycle, alanine metabolism, histidine metabolism, and energy metabolism, but they may have some specific pathways. B cereus has higher efficiency in utilizing monosaccharide, B. anthracis is rich in degradation and transport pathways of amino acids. A glutamate metabolic bypass way exists in B. thuringiensis. Analysis of metabolic pathways provides a new way to study and use food toxin, anthrax toxin, and insecticidal toxin of these strains in future.
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García-Cano I, Velasco-Pérez L, Rodríguez-Sanoja R, Sánchez S, Mendoza-Hernández G, Llorente-Bousquets A, Farrés A. Detection, cellular localization and antibacterial activity of two lytic enzymes of Pediococcus acidilactici ATCC 8042. J Appl Microbiol 2011; 111:607-15. [DOI: 10.1111/j.1365-2672.2011.05088.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shao X, Jiang M, Yu Z, Cai H, Li L. Surface display of heterologous proteins in Bacillus thuringiensis using a peptidoglycan hydrolase anchor. Microb Cell Fact 2009; 8:48. [PMID: 19754974 PMCID: PMC2754439 DOI: 10.1186/1475-2859-8-48] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Accepted: 09/16/2009] [Indexed: 01/01/2023] Open
Abstract
Background Previous studies have revealed that the lysin motif (LysM) domains of bacterial cell wall-degrading enzymes are able to bind to peptidoglycan moieties of the cell wall. This suggests an approach for a cell surface display system in Gram-positive bacteria using a LysM-containing protein as the anchoring motif. In this study, we developed a new surface display system in B. thuringiensis using a LysM-containing peptidoglycan hydrolase, endo-β-N-acetylglucosaminidase (Mbg), as the anchor protein. Results Homology searching in the B. thuringiensis YBT-1520 genome revealed a putative peptidoglycan hydrolase gene. The encoded protein, Mbg, exhibited substantial cell-wall binding capacity. The deduced amino acid sequence of Mbg was structurally distinguished as an N-terminal domain with two tandemly aligned LysMs and a C-terminal catalytic domain. A GFP-fusion protein was expressed and used to verify the surface localization by Western blot, flow cytometry, protease accessibility, SDS sensitivity, immunofluorescence, and electron microscopy assays. Low-level constitutive expression of Mbg was elevated by introducing a sporulation-independent promoter of cry3Aa. Truncated Mbg domains with separate N-terminus (Mbgn), C-terminus (Mbgc), LysM1, or LysM2 were further compared for their cell-wall displaying efficiencies. The Mbgn moiety contributed to cell-wall anchoring, while LysM1 was the active domain. Two tandemly repeated Mbgns exhibited the highest display activity, while the activity of three repeated Mbgns was decreased. A heterologous bacterial multicopper oxidase (WlacD) was successfully displayed onto the surface of B. thuringiensis target cells using the optimum (Mbgn)2 anchor, without radically altering its catalytic activity. Conclusion Mbg can be a functional anchor protein to target different heterologous proteins onto the surface of B. thuringiensis cells. Since the LysM domain appears to be universal in Gram-positive bacteria, the strategy presented here could be applicable in other bacteria for developing this type of system.
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Affiliation(s)
- Xiaohu Shao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
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Raddadi N, Belaouis A, Tamagnini I, Hansen BM, Hendriksen NB, Boudabous A, Cherif A, Daffonchio D. Characterization of polyvalent and safe Bacillus thuringiensis
strains with potential use for biocontrol. J Basic Microbiol 2008; 49:293-303. [DOI: 10.1002/jobm.200800182] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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14
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Bacillus thuringiensis beyond insect biocontrol: plant growth promotion and biosafety of polyvalent strains. ANN MICROBIOL 2007. [DOI: 10.1007/bf03175344] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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15
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Temmerman R, Vervaeren H, Noseda B, Boon N, Verstraete W. Inhibition ofLegionella pneumophila byBacillus sp. Eng Life Sci 2007. [DOI: 10.1002/elsc.200620212] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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