Lactococcus lactis
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ABSTRACT:
PROVIDER: PRJNA108321 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Comparison of L. lactis NZ9000 ΔlmrR versus L. lactis NZ9000 wild type Keywords: Transcription profiling
2007-10-04 | GSE9168 | GEO
Project description:Gene expression in Lactococcus lactis MG1363 was compared to that of L. lactis MG1363 ∆guaA in rich GM17 medium.
2016-01-12 | GSE76764 | GEO
Project description:pBL1 is a Lactococcus lactis theta-replicating 10.9-kbp plasmid that encodes the synthetic machinery of the bacteriocin Lcn972. In this work, the transcriptomes of exponentially growing L. lactis with and without pBL1 were compared. A discrete response was observed with a total of ten genes showing significantly changed expression. Up-regulation of the lactococcal oligopeptide uptake system (opp) was observed, likely linked to a higher nitrogen demand required for Lcn972 biosynthesis. Striking, celB coding for the membrane porter IIC of the cellobiose-PTS and the upstream gene llmg0186 were down-regulated. Growth profiles for L. lactis strains MG1363, MG1363/pBL1 and MG1363ΔcelB grown in CDM-cellobiose confirmed slower growth of pBL1 and ΔcelB while no differences were scored on glucose. The presence of pBL1 shifted the fermentation products towards a mixed acid profile and promoted substantial changes in intracellular pool sizes for glycolytic intermediates in cellobiose-growing cells as determined by HPLC and NMR. Overall, these data support the genetic evidence of a constriction in cellobiose uptake. Notably, several cell wall precursors accumulated, while other UDP-activated sugars pools were lower, which could reflect rerouting of precursors towards the production of structural or storage polysaccharides. Moreover, slow cellobiose-growing cells and those lacking celB were more tolerant to Lcn972 than cellobiose adapted cells. Thus, down-regulation of celB could help to build-up a response against the antimicrobial activity of Lcn972 enhancing self-immunity of the producer cells. The transcriptomes of Lactococcus lactis MG1614 with and without the bacteriocinogenic plasmid pBL1, grown under laboratory conditions, were compared using three biological replicates.
2011-09-14 | E-GEOD-30625 | biostudies-arrayexpress
Project description:Comparison of L. lactis NZ9000 ?lmrR versus L. lactis NZ9000 wild type Keywords: Transcription profiling Comparison between strain lacking transcriptional regulator LmrR of major Lactococcal mdr transporter LmrCD, and wild type parental strain.
2007-10-04 | E-GEOD-9168 | biostudies-arrayexpress
Project description:Trade-offs often occurs during experimental evolution. For example, the degeneration of growth in glucose was found in a galactose adapted yeast. Here, we isolated one Lactococcus lactis mutant using experimental on maltose. The mutant grows normally on glucose, but faster than the wild-type on maltose and galactose. DNA microarray analysis and whole genome re-sequencing were applied to disclose the crucial points that determine the phenotype.
2016-12-31 | GSE56042 | GEO
Project description:pBL1 is a Lactococcus lactis theta-replicating 10.9-kbp plasmid that encodes the synthetic machinery of the bacteriocin Lcn972. In this work, the transcriptomes of exponentially growing L. lactis with and without pBL1 were compared. A discrete response was observed with a total of ten genes showing significantly changed expression. Up-regulation of the lactococcal oligopeptide uptake system (opp) was observed, likely linked to a higher nitrogen demand required for Lcn972 biosynthesis. Striking, celB coding for the membrane porter IIC of the cellobiose-PTS and the upstream gene llmg0186 were down-regulated. Growth profiles for L. lactis strains MG1363, MG1363/pBL1 and MG1363ΔcelB grown in CDM-cellobiose confirmed slower growth of pBL1 and ΔcelB while no differences were scored on glucose. The presence of pBL1 shifted the fermentation products towards a mixed acid profile and promoted substantial changes in intracellular pool sizes for glycolytic intermediates in cellobiose-growing cells as determined by HPLC and NMR. Overall, these data support the genetic evidence of a constriction in cellobiose uptake. Notably, several cell wall precursors accumulated, while other UDP-activated sugars pools were lower, which could reflect rerouting of precursors towards the production of structural or storage polysaccharides. Moreover, slow cellobiose-growing cells and those lacking celB were more tolerant to Lcn972 than cellobiose adapted cells. Thus, down-regulation of celB could help to build-up a response against the antimicrobial activity of Lcn972 enhancing self-immunity of the producer cells.
2011-09-15 | GSE30625 | GEO
Project description:we report the identification and sequences of the tRNAome of industrially relevant microorganism Lactococcus lactis
2014-07-29 | GSE55392 | GEO
Project description:In the present study we examine the changes in the expression of genes of Lactococcus lactis subspecies cremoris MG1363 during growth in milk. To reveal which specific classes of genes (pathways, operons, regulons, COGs) are important, we performed a transcriptome time series experiment. Global analysis of gene expression over time showed that L. lactis adapted quickly to the environmental changes. Using upstream sequences of genes with correlated gene expression profiles, we uncovered a substantial number of putative DNA binding motifs that may be relevant for L. lactis fermentative growth in milk. All available novel and literature-derived data were integrated into network reconstruction building blocks, which were used to reconstruct and visualize the L. lactis gene regulatory network. This network enables easy mining in the chrono-transcriptomics data. A freely available website at http://milkts.molgenrug.nl gives full access to all transcriptome data, to the reconstructed network and to the individual network building blocks.
2012-09-12 | GSE40780 | GEO
Project description:The stringent response was defined in Lactococcus lactis through transcript profiling after the addition of a chemical inductor, the norvaline. Gene expression was measured in the exponential growth phase (reference sample) and at 1.6 h after norvaline addition. Four hundred and sixty one differentially expressed genes were identified and constituted the stringent response regulon. Keywords: stress response, time course Stringent response was imposed through norvaline addition during the growth of Lactococcus lactis IL1403 under controlled conditions (30 °C, pH 6.6, nitrogen atmosphere). Cell samples were harvested in exponential phase and 1.6 h after norvaline addition. Total RNA was extracted from these samples and radiolabelled cDNA were prepared and hybridized on nylon arrays. 2053 amplicons specific of Lactococcus lactis IL1403 genes were spotted twice on the array. The 2 time-points were analyzed simultaneously and 3 independent repetitions were performed.
2010-06-25 | E-GEOD-10254 | biostudies-arrayexpress
Project description:The stringent response was defined in Lactococcus lactis through transcript profiling after the addition of a chemical inductor, the norvaline. Gene expression was measured in the exponential growth phase (reference sample) and at 1.6 h after norvaline addition. Four hundred and sixty one differentially expressed genes were identified and constituted the stringent response regulon. Keywords: stress response, time course
2009-04-28 | GSE10254 | GEO