Limosilactobacillus reuteri subsp. rodentium
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PROVIDER: PRJNA147845 | ENA |
REPOSITORIES: ENA
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Project description:Autoinducer-2 (AI-2)-mediated quorum sensing has been extensively studied in relation to the regulation of microbial behaviour. There are however two potential roles for the AI-2 synthase (LuxS). The first is in the production of AI-2 and the second is as an enzyme in the activated methyl cycle where it catalyses the conversion of S-ribosylhomocysteine to homocysteine. The by-product of the reaction catalysed by LuxS is (S)-4,5-dihydroxy-2,3-pentanedione (DPD), which spontaneously forms the furanones known collectively as AI-2. The mammalian gastrointestinal tract contains a complex collection of bacterial species so a method of interspecies communication might influence community structure and function. Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent forestomach where it adheres to the non-secretory epithelium of the forestomach forming a biofilm. Microarray comparisons of gene expression profiles of the L. reuteri 100-23 wild type and a luxS mutant under different culture conditions revealed altered transcription of genes encoding proteins involved in cysteine biosynthesis, the oxidative stress response and cell wall proteins. Metabolomic analysis revealed that the luxS mutation affected cellular levels of fermentation products, fatty acids and amino acids. Cell density-dependent changes (log phase versus stationary phase growth) in gene transcription were not detected. Overall, the results indicated that AI-2 was unlikely to be involved in gene regulation in L. reuteri 100-23 in a classical quorum-sensing type manner.
2011-10-01 | GSE32520 | GEO
Project description:Autoinducer-2 (AI-2)-mediated quorum sensing has been extensively studied in relation to the regulation of microbial behaviour. There are however two potential roles for the AI-2 synthase (LuxS). The first is in the production of AI-2 and the second is as an enzyme in the activated methyl cycle where it catalyses the conversion of S-ribosylhomocysteine to homocysteine. The by-product of the reaction catalysed by LuxS is (S)-4,5-dihydroxy-2,3-pentanedione (DPD), which spontaneously forms the furanones known collectively as AI-2. The mammalian gastrointestinal tract contains a complex collection of bacterial species so a method of interspecies communication might influence community structure and function. Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent forestomach where it adheres to the non-secretory epithelium of the forestomach forming a biofilm. Microarray comparisons of gene expression profiles of the L. reuteri 100-23 wild type and a luxS mutant under different culture conditions revealed altered transcription of genes encoding proteins involved in cysteine biosynthesis, the oxidative stress response and cell wall proteins. Metabolomic analysis revealed that the luxS mutation affected cellular levels of fermentation products, fatty acids and amino acids. Cell density-dependent changes (log phase versus stationary phase growth) in gene transcription were not detected. Overall, the results indicated that AI-2 was unlikely to be involved in gene regulation in L. reuteri 100-23 in a classical quorum-sensing type manner. Analysis of the microarray data was obtained from two or more independent biological replicates.
2011-09-30 | E-GEOD-32520 | biostudies-arrayexpress
Project description:Maltose utilization by Lactobacillus reuteri 100-23
| PRJNA132773 | ENA
Project description:Inactivation of the Lactobacillus reuteri 100-23 ureC gene affects in vitro acid tolerance, and impairs ecological fitness in vivo
| PRJNA153021 | ENA
Project description:Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent gastrointestinal system that adheres to the non-secretory epithelium of the forestomach and forms biofilms. Microarray analysis of the expression profile of L. reuteri 100-23 cells harvested from the stomach of ex-Lactobacillus-free mice, compared to those of L. reuteri 100-23 in laboratory culture, revealed an in vivo upregulation of a urease gene cluster by greater than 50-fold. Genes for urease production were absent in all publically available Lactobacillus genome sequences except L. reuteri 100-23 and have recently been identified as specific to rodent strains of L. reuteri (Frese et al. 2011). In the current study, the urease enzyme was shown to be functional. Supplementation with 2% urea allowed L. reuteri 100-23 to increase the pH of the culture medium. A mutant strain of L. reuteri 100-23 was developed by insertional inactivation of the ureC gene, which encodes the largest subunit of the urease enzyme. The mutant strain was unable to hydrolyze urea to increase the pH of culture medium, and did not survive acid stress at pH 2.5 for 6 h, even in the presence of urea. In contrast, the wild type strain was still viable after 6 h when 2% urea supplementation was included. When mice free of lactobacilli were inoculated with a mixture of equal numbers of wild type L. reuteri 100-23 and ureC mutant cells, the wild type constituted 99% of the resulting Lactobacillus population in the stomach, caecum and jejunum after one week (108 cells/gram of sample). This study has therefore shown the importance of a functional urease enzyme in the ecological fitness of L. reuteri 100-23.
2012-09-30 | GSE36286 | GEO
Project description:Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent gastrointestinal system that adheres to the non-secretory epithelium of the forestomach and forms biofilms. Microarray analysis of the expression profile of L. reuteri 100-23 cells harvested from the stomach of ex-Lactobacillus-free mice, compared to those of L. reuteri 100-23 in laboratory culture, revealed an in vivo upregulation of a urease gene cluster by greater than 50-fold. Genes for urease production were absent in all publically available Lactobacillus genome sequences except L. reuteri 100-23 and have recently been identified as specific to rodent strains of L. reuteri (Frese et al. 2011). In the current study, the urease enzyme was shown to be functional. Supplementation with 2% urea allowed L. reuteri 100-23 to increase the pH of the culture medium. A mutant strain of L. reuteri 100-23 was developed by insertional inactivation of the ureC gene, which encodes the largest subunit of the urease enzyme. The mutant strain was unable to hydrolyze urea to increase the pH of culture medium, and did not survive acid stress at pH 2.5 for 6 h, even in the presence of urea. In contrast, the wild type strain was still viable after 6 h when 2% urea supplementation was included. When mice free of lactobacilli were inoculated with a mixture of equal numbers of wild type L. reuteri 100-23 and ureC mutant cells, the wild type constituted 99% of the resulting Lactobacillus population in the stomach, caecum and jejunum after one week (108 cells/gram of sample). This study has therefore shown the importance of a functional urease enzyme in the ecological fitness of L. reuteri 100-23. Analysis of the microarray data was obtained from two independent biological replicates.
2012-09-30 | E-GEOD-36286 | biostudies-arrayexpress
Project description:Commensal (symbiont) bacteria form communities in various regions of the bodies of vertebrates. Phylogenetic analysis of gut communities is advanced, but the relationships, especially at the trophic level, between commensals that share gut habitats of monogastric animals have not been investigated to any extent. Lactobacillus reuteri strain 100-23 and Lactobacillus johnsonii strain 100-33 cohabit in the forestomach of mice. According to the niche exclusion principle, this should not be possible because both strains utilise the two main fermentable carbohydrates present in the stomach digesta: glucose and maltose. We show, based on gene transcription analysis, in vitro physiological assays, and in vivo experiments that the two strains can co-exist in the forestomach habitat because L. reuteri 100-23 transports maltose into its cells more efficiently than does L. johnsonii 100-33. Conversely, strain 100-33 transports glucose more efficiently than 100-23. As a result, 100-23 shows a preference for growth using maltose, whereas 100-33 prefers glucose. Mutation of the maltose phosphorylase gene (malA) of strain 100-23 prevented its growth on maltose-containing culture medium, and resulted in the numerical dominance of 100-33 in the forestomach. The fundamental niche of L. reuteri 100-23 in the mouse forestomach can be defined in terms of glucose and maltose fermentation. Its realised niche when L. johnsonii 100-33 is present is maltose fermentation. Hence nutritional adaptations provided niche differentiation that enabled cohabitation by the two strains through resource partitioning in the mouse forestomach. This real life, trophic phenomenon conforms to a mathematical model.
2010-12-11 | GSE24472 | GEO
Project description:Commensal (symbiont) bacteria form communities in various regions of the bodies of vertebrates. Phylogenetic analysis of gut communities is advanced, but the relationships, especially at the trophic level, between commensals that share gut habitats of monogastric animals have not been investigated to any extent. Lactobacillus reuteri strain 100-23 and Lactobacillus johnsonii strain 100-33 cohabit in the forestomach of mice. According to the niche exclusion principle, this should not be possible because both strains utilise the two main fermentable carbohydrates present in the stomach digesta: glucose and maltose. We show, based on gene transcription analysis, in vitro physiological assays, and in vivo experiments that the two strains can co-exist in the forestomach habitat because L. reuteri 100-23 transports maltose into its cells more efficiently than does L. johnsonii 100-33. Conversely, strain 100-33 transports glucose more efficiently than 100-23. As a result, 100-23 shows a preference for growth using maltose, whereas 100-33 prefers glucose. Mutation of the maltose phosphorylase gene (malA) of strain 100-23 prevented its growth on maltose-containing culture medium, and resulted in the numerical dominance of 100-33 in the forestomach. The fundamental niche of L. reuteri 100-23 in the mouse forestomach can be defined in terms of glucose and maltose fermentation. Its realised niche when L. johnsonii 100-33 is present is maltose fermentation. Hence nutritional adaptations provided niche differentiation that enabled cohabitation by the two strains through resource partitioning in the mouse forestomach. This real life, trophic phenomenon conforms to a mathematical model. Analysis of the microarray data was obtained from two independent biological replicates. A dye swap was included in the analysis
2010-12-11 | E-GEOD-24472 | biostudies-arrayexpress
Project description:Yersinia pestis, the etiological agent of plague, is able to sense cell density by quorum sensing. The function of quorum sensing in Y. pestis is not clear. Here, the process of autoinducer 2 (AI-2) quorum sensing was investigated by comparing transcript profiles when luxS gene was knocked out. The luxS gene encodes S-ribosylhomocysteinase which can produce DPD, a precursor of AI-2. The strain ∆pgm (pigmentation-negative) mutant R88 was called wild type. The ∆pgm ∆luxS mutant was called control.
2013-09-05 | GSE22849 | GEO
Project description:Comparison of gene expression between L. reuteri ATCC PTA 6475 and PocR mutant grown in semi-defined medium after 24h of growth at 37C in anaerobic condition
2010-12-10 | GSE22926 | GEO