1
|
Yin B, Lin X, Wang T, Liu L. Detailed Characterization of Antipathogenic Properties of Human Milk N-Glycome, against Staphylococcus aureus, Indicating Its Targeting on Cell Surface Proteins. ACS Infect Dis 2022; 8:635-644. [PMID: 35132860 DOI: 10.1021/acsinfecdis.1c00652] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Human milk N-glycome was previously identified to have strong antipathogenic activities. This study is aimed to characterize the detailed antibacterial properties and the potential function mechanism of human milk N-glycome against Staphylococcus aureus. A serials of traditional antibacterial assays showed that human milk N-glycome possessed both bacteriostatic and bactericidal activities, which was further confirmed by the cell structure disruption including the change of transmembrane potential and leakage of intracellular contents. The results of the bacterial surface zeta potential and hydrophobicity, bacterial binding assay, gel shift assay, and fluorescence spectra and the different synergistic effects of human milk N-glycome combined with different antibiotics indicated that the bacterial surface proteins could be the targets of human milk N-glycome. Moreover, human milk N-glycome also showed antibiofilm activity. In conclusion, human milk N-glycome exhibited good potential for acting as an antibacterial substance against S. aureus and the antibacterial mechanism was a cell surface targeting action.
Collapse
Affiliation(s)
- Binru Yin
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Xisha Lin
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Ting Wang
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Li Liu
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
- Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| |
Collapse
|
2
|
Zand E, Pfanner H, Domig KJ, Sinn G, Zunabovic-Pichler M, Jaeger H. Biofilm-Forming Ability of Microbacterium lacticum and Staphylococcus capitis Considering Physicochemical and Topographical Surface Properties. Foods 2021; 10:foods10030611. [PMID: 33805651 PMCID: PMC8001712 DOI: 10.3390/foods10030611] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/08/2021] [Accepted: 03/10/2021] [Indexed: 11/16/2022] Open
Abstract
Biofilm characteristics of Microbacterium lacticum D84 (M. lacticum) and Staphylococcus capitis subsp. capitis (S. capitis) on polytetrafluoroethylene and AISI-304 stainless steel at early- (24, 48 h) and late-stage (144, 192 h) biofilm formation were investigated. M. lacticum biofilm structure was more developed compared to S. capitis, representing vastly mature biofilms with a strongly developed amorphous matrix, possibly extracellular polymeric substances (EPSs), at late-stage biofilm formation. S. capitis showed faster growth behavior but still resulted in a relatively flat biofilm structure. Strong correlations were found between several roughness parameters and S. capitis surface coverage (r ≥ 0.98), and between total surface free energy (γs) and S. capitis surface coverage (r = 0.89), while M. lacticum remained mostly unaffected. The pronounced ubiquitous biofilm characteristics make M. lacticum D84 a suitable model for biofilm research. Studying biofilm formation of these bacteria may help one understand bacterial adhesion on interfaces and hence reduce biofilm formation in the food industry.
Collapse
Affiliation(s)
- Elena Zand
- Institute of Food Technology, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria; (E.Z.); (H.P.); (H.J.)
| | - Hedwig Pfanner
- Institute of Food Technology, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria; (E.Z.); (H.P.); (H.J.)
| | - Konrad J. Domig
- Institute of Food Science, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria;
| | - Gerhard Sinn
- Institute of Physics and Material Sciences, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria;
| | - Marija Zunabovic-Pichler
- Institute of Food Science, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria;
- Correspondence:
| | - Henry Jaeger
- Institute of Food Technology, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria; (E.Z.); (H.P.); (H.J.)
| |
Collapse
|
3
|
Fraqueza MJ, Rocha JM, Laranjo M, Potes ME, Fialho AR, Fernandes MJ, Fernandes MH, Barreto A, Semedo-Lemsaddek T, Elias M. What is the Main Processing Factor Influencing Staphylococcus Species Diversity in Different Manufacturing Units? J Food Sci 2019; 84:2932-2943. [PMID: 31524954 DOI: 10.1111/1750-3841.14796] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 01/01/2023]
Abstract
The microbiota of traditional dry-cured sausages and industrial environment was assessed to characterize the diversity of coagulase-negative staphylococci (CNS), and establish potential relationships with hygiene level or technological characteristics. Eight processing units from South Portugal were audited according to a checklist of requirements. Environmental and products' samples at different production stages were evaluated regarding hygiene and safety criteria. CNS were recovered, characterized, and their potential use as starters evaluated. Low genetic diversity was observed for Staphylococcus xylosus, whereas Staphylococcus equorum showed diverse genetic profiles. Staphylococcus xylosus predominated in products with a long period of cold smoking, Staphylococcus saprophyticus in products with a long period of hot smoking, Staphylococcus epidermidis in products with a short period of cold smoking, and S. equorum in nonsmoked products. Most S. xylosus were resistant to tetracycline, whereas S. equorum were susceptible. Antibioresistance restricted the selection of starters due to safety recommendations. PRACTICAL APPLICATION: The present manuscript highlighted a few staphylococci strains that could potentially be used as starter cultures in fermented meat products. These selected strains do not show resistance to antimicrobials, exhibit adequate technological features, and are well adapted to the industrial environments of meat processing industries using different processing technologies. Therefore, the selected strains ready to be used in the manufacturing of traditional fermented meat products to ensure safety, standardize product properties, and shorten ripening.
Collapse
Affiliation(s)
- Maria João Fraqueza
- Faculdade de Medicina Veterinária, CIISA-Centro de Investigação Interdisciplinar em Sanidade Animal, Univ. de Lisboa, Av. da Univ. Técnica, Pólo Universitário, Alto da Ajuda, Lisboa, 1300-477, Portugal
| | - João Miguel Rocha
- ICAAM-Inst. de Ciências Agrárias e Ambientais Mediterrânicas, IIFA-Inst. de Investigação e Formação Avançada, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
| | - Marta Laranjo
- ICAAM-Inst. de Ciências Agrárias e Ambientais Mediterrânicas, IIFA-Inst. de Investigação e Formação Avançada, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
| | - Maria Eduarda Potes
- ICAAM-Inst. de Ciências Agrárias e Ambientais Mediterrânicas, IIFA-Inst. de Investigação e Formação Avançada, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
- Dept. de Medicina Veterinária, Escola de Ciências e Tecnologia, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
| | - Ana Rita Fialho
- ICAAM-Inst. de Ciências Agrárias e Ambientais Mediterrânicas, IIFA-Inst. de Investigação e Formação Avançada, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
| | - Maria José Fernandes
- Faculdade de Medicina Veterinária, CIISA-Centro de Investigação Interdisciplinar em Sanidade Animal, Univ. de Lisboa, Av. da Univ. Técnica, Pólo Universitário, Alto da Ajuda, Lisboa, 1300-477, Portugal
| | - Maria Helena Fernandes
- Faculdade de Medicina Veterinária, CIISA-Centro de Investigação Interdisciplinar em Sanidade Animal, Univ. de Lisboa, Av. da Univ. Técnica, Pólo Universitário, Alto da Ajuda, Lisboa, 1300-477, Portugal
| | - António Barreto
- Faculdade de Medicina Veterinária, CIISA-Centro de Investigação Interdisciplinar em Sanidade Animal, Univ. de Lisboa, Av. da Univ. Técnica, Pólo Universitário, Alto da Ajuda, Lisboa, 1300-477, Portugal
| | - Teresa Semedo-Lemsaddek
- Faculdade de Medicina Veterinária, CIISA-Centro de Investigação Interdisciplinar em Sanidade Animal, Univ. de Lisboa, Av. da Univ. Técnica, Pólo Universitário, Alto da Ajuda, Lisboa, 1300-477, Portugal
| | - Miguel Elias
- ICAAM-Inst. de Ciências Agrárias e Ambientais Mediterrânicas, IIFA-Inst. de Investigação e Formação Avançada, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
- Dept. de Fitotecnia, Escola de Ciências e Tecnologia, Univ. de Évora, Pólo da Mitra, Ap. 94, Évora, 7006-554, Portugal
| |
Collapse
|
4
|
Wang GY, Li M, Ma F, Wang HH, Xu XL, Zhou GH. Physicochemical properties of Pseudomonas fragi isolates response to modified atmosphere packaging. FEMS Microbiol Lett 2017; 364:3845284. [DOI: 10.1093/femsle/fnx106] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 05/18/2017] [Indexed: 02/02/2023] Open
|
5
|
Abstract
Starter cultures could play an essential role in the manufacture of traditional cured meat products. In order to achieve objectives related to meat products’ quality and safety improvement, the selection of particular strains constituting a starter culture should be carried out in the context of its application, since its functionality will depend on the type of sausage and process conditions. Also, strain selection should comply with particular requirements to warrant safety. The aim of the current review is to update the knowledge on the use of starter cultures in traditional meat products, with focus on dry-fermented products. In this manuscript, we will try to give answers to some relevant questions: Which starter cultures are used and why? Why are LAB used? What are their role and their specific mode of action? Which other groups of microorganisms (bacteria and fungi) are used as starter cultures and how do they act? A particular revision of omics approach regarding starter cultures is made since the use of these techniques allows rapid screening of promising wild strains with desirable functional characteristics, enabling the development of starter cultures better adapted to the meat matrix.
Collapse
|
6
|
Bückle Née Müller A, Kranz M, Schmidt H, Weiss A. Genetic diversity and population structure of food-borne Staphylococcus carnosus strains. Syst Appl Microbiol 2016; 40:34-41. [PMID: 27931747 DOI: 10.1016/j.syapm.2016.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 11/21/2016] [Accepted: 11/23/2016] [Indexed: 11/18/2022]
Abstract
The species Staphylococcus carnosus is a non-pathogenic representative of the coagulase negative staphylococci. Specific strains are applied as meat starter cultures. The species consists of two subspecies, S. carnosus ssp. carnosus and S. carnosus ssp. utilis. In order to place S. carnosus strains, characterized in former studies, in a genetic background that allows a typing of candidates for starter cultures, a Multilocus Sequence Typing (MLST) scheme was developed. Internal fragments of the genes tpiA, xprT, dat, gmk, glpK, narG, cstA, encoding triosephosphate isomerase, xanthine phosphoribosyltransferase, d-amino acid aminotransferase, guanylate kinase, glycerol kinase, the α-chain of the respiratory nitrate reductase, and a carbon starvation protein where chosen. Genes were selected based on their equal distribution in the genome, taxonomic value in subspecies differentiation and metabolic function. This MLST was applied to 44 S. carnosus strains, most of them previously analyzed for their suitability as starter cultures. The number of alleles varied between zero (tpiA) and five (cstA) and allowed the definition of nine sequence types (ST). ST1 was most abundant (18 strains), followed by ST2 (8) and ST4 (6). The nine STs confirmed a close relationship of all strains despite their isolation source and year, but lacked correlation with physiological activities relevant for starter cultures. The low amount of STs in the strain set lets us suggest that recombination between strains is rare. Thus, it is hypothesized that evolutionary events seem to be due to single point mutations rather than intrachromosomal recombination, and that the species possesses a clonal population structure.
Collapse
Affiliation(s)
- Anne Bückle Née Müller
- Department of Food Microbiology and Hygiene, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstrasse 28, 70599 Stuttgart, Germany.
| | - Markus Kranz
- Department of Food Microbiology and Hygiene, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstrasse 28, 70599 Stuttgart, Germany.
| | - Herbert Schmidt
- Department of Food Microbiology and Hygiene, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstrasse 28, 70599 Stuttgart, Germany.
| | - Agnes Weiss
- Department of Food Microbiology and Hygiene, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstrasse 28, 70599 Stuttgart, Germany.
| |
Collapse
|
7
|
Bruzaud J, Tarrade J, Coudreuse A, Canette A, Herry JM, Taffin de Givenchy E, Darmanin T, Guittard F, Guilbaud M, Bellon-Fontaine MN. Flagella but not type IV pili are involved in the initial adhesion of Pseudomonas aeruginosa PAO1 to hydrophobic or superhydrophobic surfaces. Colloids Surf B Biointerfaces 2015; 131:59-66. [PMID: 25950497 DOI: 10.1016/j.colsurfb.2015.04.036] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 03/03/2015] [Accepted: 04/14/2015] [Indexed: 01/14/2023]
Abstract
Over the last decades, surface biocontamination has become a major concern in food industries and medical environments where its outcomes could vary from financial losses to public health issues. Understanding adhesion mechanisms of involved microorganisms is essential to develop new strategies of prevention and control. Adhesion of Pseudomonas aeruginosa, a nosocomial pathogenic bacterium, relies on several bacterial features, among which are bacterial appendages such as flagella and type IV pili. Here, we examine the role of P. aeruginosa PAO1 flagella and type IV pili in the adhesion to abiotic surfaces with various hydrophobicities. Adhesion kinetics showed, that after 60min, flagella increased the adhesion of the strain to surfaces with high hydrophobicity while no effect was observed on hydrophilic surfaces. Flagella of adherent bacteria exhibited specific and conserved pattern on the surfaces that suggested a higher affinity of flagella for hydrophobic surfaces. Based on these results and on previous studies in the literature, we proposed a model of flagella-mediated adhesion onto hydrophobic surfaces where these appendages induce the first contact and promote the adhesion of the bacterial body. These findings suggest that anti-bioadhesive surface design should take into consideration the presence of bacterial appendages.
Collapse
Affiliation(s)
- Jérôme Bruzaud
- INRA, AgroParisTech, UMR 1319 MICALIS, 78350 Jouy-en-Josas, France; AgroParisTech, INRA, UMR MICALIS, 91300 Massy, France
| | - Jeanne Tarrade
- Université de Nice Sophia-Antipolis & CNRS, UMR 7336, 06108 Nice Cedex 2, France
| | | | - Alexis Canette
- INRA, AgroParisTech, UMR 1319 MICALIS, 78350 Jouy-en-Josas, France; AgroParisTech, INRA, UMR MICALIS, 91300 Massy, France
| | - Jean-Marie Herry
- INRA, AgroParisTech, UMR 1319 MICALIS, 78350 Jouy-en-Josas, France; AgroParisTech, INRA, UMR MICALIS, 91300 Massy, France
| | | | - Thierry Darmanin
- Université de Nice Sophia-Antipolis & CNRS, UMR 7336, 06108 Nice Cedex 2, France
| | - Frédéric Guittard
- Université de Nice Sophia-Antipolis & CNRS, UMR 7336, 06108 Nice Cedex 2, France
| | - Morgan Guilbaud
- INRA, AgroParisTech, UMR 1319 MICALIS, 78350 Jouy-en-Josas, France; AgroParisTech, INRA, UMR MICALIS, 91300 Massy, France
| | - Marie-Noëlle Bellon-Fontaine
- INRA, AgroParisTech, UMR 1319 MICALIS, 78350 Jouy-en-Josas, France; AgroParisTech, INRA, UMR MICALIS, 91300 Massy, France.
| |
Collapse
|
8
|
Thewes N, Loskill P, Jung P, Peisker H, Bischoff M, Herrmann M, Jacobs K. Hydrophobic interaction governs unspecific adhesion of staphylococci: a single cell force spectroscopy study. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1501-12. [PMID: 25247133 PMCID: PMC4168904 DOI: 10.3762/bjnano.5.163] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 08/12/2014] [Indexed: 05/25/2023]
Abstract
Unspecific adhesion of bacteria is usually the first step in the formation of biofilms on abiotic surfaces, yet it is unclear up to now which forces are governing this process. Alongside long-ranged van der Waals and electrostatic forces, short-ranged hydrophobic interaction plays an important role. To characterize the forces involved during approach and retraction of an individual bacterium to and from a surface, single cell force spectroscopy is applied: A single cell of the apathogenic species Staphylococcus carnosus isolate TM300 is used as bacterial probe. With the exact same bacterium, hydrophobic and hydrophilic surfaces can be probed and compared. We find that as far as 50 nm from the surface, attractive forces can already be recorded, an indication of the involvement of long-ranged forces. Yet, comparing the surfaces of different surface energy, our results corroborate the model that large, bacterial cell wall proteins are responsible for adhesion, and that their interplay with the short-ranged hydrophobic interaction of the involved surfaces is mainly responsible for adhesion. The ostensibly long range of the attraction is a result of the large size of the cell wall proteins, searching for contact via hydrophobic interaction. The model also explains the strong (weak) adhesion of S. carnosus to hydrophobic (hydrophilic) surfaces.
Collapse
Affiliation(s)
- Nicolas Thewes
- Experimental Physics, Campus E2 9, Saarland University, D-66123 Saarbrücken, Germany
| | - Peter Loskill
- Experimental Physics, Campus E2 9, Saarland University, D-66123 Saarbrücken, Germany
- Present address: Dept. of Bioengineering and California Institute for Quantitative Biosciences (QB3), University of California at Berkeley, Berkeley, California 94720, USA
| | - Philipp Jung
- Institute of Medical Microbiology and Hygiene, Saarland University, D-66421 Homburg/Saar, Germany
| | - Henrik Peisker
- Institute of Medical Microbiology and Hygiene, Saarland University, D-66421 Homburg/Saar, Germany
| | - Markus Bischoff
- Institute of Medical Microbiology and Hygiene, Saarland University, D-66421 Homburg/Saar, Germany
| | - Mathias Herrmann
- Institute of Medical Microbiology and Hygiene, Saarland University, D-66421 Homburg/Saar, Germany
| | - Karin Jacobs
- Experimental Physics, Campus E2 9, Saarland University, D-66123 Saarbrücken, Germany
| |
Collapse
|
9
|
Wang H, Ding S, Wang G, Xu X, Zhou G. In situ characterization and analysis of Salmonella biofilm formation under meat processing environments using a combined microscopic and spectroscopic approach. Int J Food Microbiol 2013; 167:293-302. [DOI: 10.1016/j.ijfoodmicro.2013.10.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 10/07/2013] [Accepted: 10/07/2013] [Indexed: 11/27/2022]
|
10
|
Wang H, Ding S, Dong Y, Ye K, Xu X, Zhou G. Biofilm formation of Salmonella serotypes in simulated meat processing environments and its relationship to cell characteristics. J Food Prot 2013; 76:1784-9. [PMID: 24112581 DOI: 10.4315/0362-028x.jfp-13-093] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Salmonella attached to meat contact surfaces encountered in meat processing facilities may serve as a source of cross-contamination. In this study, the influence of serotypes and media on biofilm formation of Salmonella was investigated in a simulated meat processing environment, and the relationships between biofilm formation and cell characteristics were also determined. All six serotypes (Salmonella enterica serotype Heidelberg, Salmonella Derby, Salmonella Agona, Salmonella Indiana, Salmonella Infantis, and Salmonella Typhimurium) can readily form biofilms on stainless steel surfaces, and the amounts of biofilms were significantly influenced by the serotypes, incubation media, and incubation time used in this study. Significant differences in cell surface hydrophobicity, autoaggregation, motility, and growth kinetic parameters were observed between individual serotypes tested. Except for growth kinetic parameters, the cell characteristics were correlated with the ability of biofilm formation incubated in tryptic soy broth, whereas no correlation with biofilm formation incubated in meat thawing-loss broth (an actual meat substrate) was found. Salmonella grown in meat thawing-loss broth showed a "cloud-shaped" morphology in the mature biofilm, whereas when grown in tryptic soy broth it had a "reticulum-shaped" appearance. Our study provides some practical information to understand the process of biofilm formation on meat processing contact surfaces.
Collapse
Affiliation(s)
- Huhu Wang
- Key Laboratory of Meat Processing and Quality Control, Ministry of Education, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | | | | | | | | | | |
Collapse
|
11
|
Biofilm formation of meat-borne Salmonella enterica and inhibition by the cell-free supernatant from Pseudomonas aeruginosa. Food Control 2013. [DOI: 10.1016/j.foodcont.2013.01.047] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
12
|
Landeta G, Curiel J, Carrascosa A, Muñoz R, de las Rivas B. Characterization of coagulase-negative staphylococci isolated from Spanish dry cured meat products. Meat Sci 2013; 93:387-96. [DOI: 10.1016/j.meatsci.2012.09.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 09/06/2012] [Accepted: 09/13/2012] [Indexed: 01/09/2023]
|
13
|
Highly efficient Staphylococcus carnosus mutant selection system based on suicidal bacteriocin activation. Appl Environ Microbiol 2011; 78:1148-56. [PMID: 22179253 DOI: 10.1128/aem.06290-11] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Strains from various staphylococcal species produce bacteriocin peptides, which are thought to play important roles in bacterial competition and offer interesting biotechnological avenues. Many bacteriocins are secreted as inactive prepeptides with subsequent activation by specific proteolytic cleavage. By deletion of the protease gene gdmP in Staphylococcus gallinarum Tü3928, which produces the highly active lanthionine-containing bacteriocin gallidermin (lantibiotic), a strain was created producing inactive pregallidermin. On this basis, a new suicidal mutant selection system in the food-grade bacterium Staphylococcus carnosus was developed. Whereas pregallidermin was inactive against S. carnosus, it exerted potent bactericidal activity toward GdmP-secreting S. carnosus strains. To take advantage of this effect, gdmP was cloned in plasmid vectors used for random transposon mutagenesis or targeted allelic replacement of chromosomal genes. Both mutagenesis strategies rely on rare recombination events, and it has remained difficult and laborious to identify mutants among a vast majority of bacterial clones that still contain the delivery vectors. The gdmP-expressing plasmids pGS1 and pGS2 enabled very fast, easy, and reliable identification of transposon and gene replacement mutants, respectively. Mutant selection in the presence of pregallidermin caused suicidal inactivation of all clones that had retained the plasmids and allowed growth of only plasmid-cured mutants. Efficiency of mutant identification was several magnitudes higher than standard screening for the absence of plasmid-encoded antibiotic resistance markers and reached 100% specificity. Thus, the new pregallidermin-based mutant selection system represents a substantial improvement of staphylococcal mutagenesis methodology.
Collapse
|
14
|
Marino M, Frigo F, Bartolomeoli I, Maifreni M. Safety-related properties of staphylococci isolated from food and food environments. J Appl Microbiol 2010; 110:550-61. [PMID: 21143714 DOI: 10.1111/j.1365-2672.2010.04909.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS To test some safety-related properties within 321 staphylococci strains isolated from food and food environments. METHODS AND RESULTS The isolates were identified as Staphylococcus aureus, Staphylococcus epidermidis, Staphylococcus saprophyticus, Staphylococcus pasteuri, Staphylococcus sciuri, Staphylococcus warneri and Staphylococcus xylosus. Decarboxylase activity was quite common for the various Staphylococcus spp., and tyrosine was the most frequently decarboxylated amino acid. The frequency of antibiotic resistance was highest in Staph. pasteuri and Staph. xylosus. Several of the isolates were tolerant to QAC compounds, and in some cases, QAC tolerance was present in antibiotic-resistant strains. Most of the strains displayed moderate to high adhesion rates to stainless steel and Teflon(®). The strains that readily formed biofilms belonged to the species Staph. aureus, Staph. epidermidis and Staph. pasteuri. CONCLUSIONS An high incidence of some safety hazards was found within the staphylococcal strains of food origin tested in this study. In particular, amino acid decarboxylase activity and biofilm-forming ability were common within strains, and antibiotic resistance and tolerance to QAC-based compounds occurred frequently as well. These characteristics are an important safety concern for food industry. SIGNIFICANCE AND IMPACT OF THE STUDY This work gives a first picture of safety hazards within staphylococcal species isolated from food environments. The presence of disinfectant-resistant staphylococci is a concern because resistance can be genetically transferred between the various Staphylococcus species. This could lead an increase and spread of resistant enterotoxic staphylococci and/or pathogenic staphylococci.
Collapse
Affiliation(s)
- M Marino
- Department of Food Science, University of Udine, Udine, Italy.
| | | | | | | |
Collapse
|
15
|
Palmer JS, Flint SH, Schmid J, Brooks JD. The role of surface charge and hydrophobicity in the attachment of Anoxybacillus flavithermus isolated from milk powder. J Ind Microbiol Biotechnol 2010; 37:1111-9. [DOI: 10.1007/s10295-010-0758-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Accepted: 05/24/2010] [Indexed: 11/28/2022]
|
16
|
Interaction between host cells and septicemic Salmonella enterica serovar typhimurium isolates from pigs. J Clin Microbiol 2009; 47:3413-9. [PMID: 19710281 DOI: 10.1128/jcm.00136-09] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Salmonella enterica serovar Typhimurium is an important pathogen in swine and is also a frequently reported zoonotic agent. The objective of this study was to characterize isolates of S. enterica serovar Typhimurium associated with septicemia in swine and to compare them to isolates recovered from clinically healthy pigs. We were particularly interested in comparing the two groups of isolates for their ability to adhere to and invade host cells, to be phagocytized and survive in monocyte cells, to induce apoptosis, and to adhere to intestinal mucus. Their surface properties were also evaluated by interactions with solvents. The isolates recovered from diseased animals were shown to invade intestinal epithelial cell lines at a higher rate (P = 0.003) than isolates from healthy pigs. Septicemic isolates were phagocytized by human monocytes at a higher rate than isolates from healthy pigs (P = 0.009). The mean percentages of phagocytosis were significantly lower for human monocytes than for porcine monocytes (P = 0.02 and P = 0.008, respectively) for isolates from both diseased and healthy animals. Healthy animal isolates were phagocytized more by porcine monocytes at 15 min (P = 0.02) than septicemic isolates. No difference between isolates from septicemic pigs and isolates from healthy pigs was detected for other tested parameters. These results suggest that septicemic isolates have a particular pattern of invasion.
Collapse
|
17
|
Genome analysis of the meat starter culture bacterium Staphylococcus carnosus TM300. Appl Environ Microbiol 2008; 75:811-22. [PMID: 19060169 DOI: 10.1128/aem.01982-08] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Staphylococcus carnosus genome has the highest GC content of all sequenced staphylococcal genomes, with 34.6%, and therefore represents a species that is set apart from S. aureus, S. epidermidis, S. saprophyticus, and S. haemolyticus. With only 2.56 Mbp, the genome belongs to a family of smaller staphylococcal genomes, and the ori and ter regions are asymmetrically arranged with the replichores I (1.05 Mbp) and II (1.5 Mbp). The events leading up to this asymmetry probably occurred not that long ago in evolution, as there was not enough time to approach the natural tendency of a physical balance. Unlike the genomes of pathogenic species, the TM300 genome does not contain mobile elements such as plasmids, insertion sequences, transposons, or STAR elements; also, the number of repeat sequences is markedly decreased, suggesting a comparatively high stability of the genome. While most S. aureus genomes contain several prophages and genomic islands, the TM300 genome contains only one prophage, PhiTM300, and one genomic island, nuSCA1, which is characterized by a mosaic structure mainly composed of species-specific genes. Most of the metabolic core pathways are present in the genome. Some open reading frames are truncated, which reflects the nutrient-rich environment of the meat starter culture, making some functions dispensable. The genome is well equipped with all functions necessary for the starter culture, such as nitrate/nitrite reduction, various sugar degradation pathways, two catalases, and nine osmoprotection systems. The genome lacks most of the toxins typical of S. aureus as well as genes involved in biofilm formation, underscoring the nonpathogenic status.
Collapse
|
18
|
Chavant P, Gaillard-Martinie B, Talon R, Hébraud M, Bernardi T. A new device for rapid evaluation of biofilm formation potential by bacteria. J Microbiol Methods 2007; 68:605-12. [PMID: 17218029 DOI: 10.1016/j.mimet.2006.11.010] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2006] [Revised: 11/07/2006] [Accepted: 11/20/2006] [Indexed: 10/23/2022]
Abstract
This work describes the implementation of a new assay named the BioFilm Ring Test to evaluate the ability of bacteria to form biofilms. This assay is based on the immobilisation (or not) of magnetic beads embedded by bacterial aggregates or mats (patented concept). It is realised on modified polystyrene 96-wells microtiter plates with individual 8-wells slides. The kinetic of biofilm formation of four bacterial species, Listeria monocytogenes, Escherichia coli, Staphylococcus carnosus and Staphylococcus xylosus was evaluated with this new device by comparison with the standard crystal violet staining method of sessile cells. In parallel, the biofilm growth was visualized by Scanning Electron Microscopy (SEM) observations. The BioFilm Ring Test gave similar but faster results than the crystal violet method. Moreover, the new assay was easier to implement, more reproducible and allowed high throughput screenings due to limited manipulations (no washing and staining steps) and rapid and accurate measurements of magnetic bead immobilisation by sessile bacterial cells.
Collapse
Affiliation(s)
- Patrick Chavant
- BioFilm Control SAS, Biopôle Clermont-Ferrand-Limagne, F-63360 St Beauzire, France
| | | | | | | | | |
Collapse
|