Project description:Biosynthetic and chemical datasets are the two major pillars for microbial drug discovery in the omics era. Despite the advancement of analysis tools and platforms for multi-strain metabolomics and genomics, linking these information sources remains a considerable bottleneck in strain prioritisation and natural product discovery. In this study, molecular networking of the 100 metabolite extracts derived from applying the OSMAC approach to 25 Polar bacterial strains, showed growth media specificity and potential chemical novelty was suggested. Moreover, the metabolite extracts were screened for antibacterial activity and promising selective bioactivity against drug-persistent pathogens such as Klebsiella pneumoniae and Acinetobacter baumannii was observed. Genome sequencing data were combined with metabolomics experiments in the recently developed computational approach, NPLinker, which was used to link BGC and molecular features to prioritise strains for further investigation based on biosynthetic and chemical information. Herein, we putatively identified the known metabolites ectoine and chrloramphenicol which, through NPLinker, were linked to their associated BGCs. The metabologenomics approach followed in this study can potentially be applied to any large microbial datasets for accelerating the discovery of new (bioactive) specialised metabolites.
Project description:This project explores dietary proteins in human dental calculus through shotgun proteomics. These files are in addition to those accidentally not included in the original publication, Dairying enabled Early Bronze Age Yamnaya steppe expansions . DOI https://doi.org/10.1038/s41586-021-03798-4. Files include raw, mgf, and mzid files from the two Botai individuals: DA092 (Botai 2A), DA089 (CII(3) 30-40), and additional files from Russian sites: DA431, DA431 (Lebyazhinka 5, LEB N-0), Z333 (Khvalynsk 2, KHA2 N-12), and Z444 (Murziha 2, MUR2 N-128) as well as the blanks used in the experiments. It also inlcludes the corresponding files for DA436, as in the previous upload an under-injected sample was included as the MDF.
Project description:Expression data for Desulfovibrio alaskensis strain G20 and mutants in regulator proteins grown on lactate sulfate media and then pelleted and transferred to another media when they reached stationary phase. The Choline mutant was transferred to lacte/sulfate minimal media and choline/sulfate minimal media. The LysX mutant was transferred to minimal media with lysine and rich media. G20 was transferred to minimal media, choline/sulfate minimal media, lactate/choline/sulfate minimal media, minimal media with lysine, and rich media. We aimed to confirm or expand the regulons of each of the transposon interupted regulator mutants and compare gene expression responses of the regulators in different growth conditions.
Project description:<p>Urine metabolomics is widely used for biomarker research in the fields of medicine and toxicology. As a consequence, characterization of the variations of the urine metabolome under basal conditions becomes critical in order to avoid confounding effects in cohort studies. Such physiological information is however very scarce in the literature and in metabolomics databases so far. Here we studied the influence of age, body mass index (BMI), and gender on metabolite concentrations in a large cohort of 183 adults by using liquid chromatography coupled with high-resolution mass spectrometry (LC-HRMS). We implemented a comprehensive statistical workflow for univariate hypothesis testing and modeling by orthogonal partial least-squares (OPLS).</p><p> This repository contains the data set from the negative ionization mode: 2 batches, 234 files (24 blanks + 26 QCs + 184 samples) in the Thermo .RAW (6.8 Go) and .mzML (18 Go) formats. The comprehensive analysis of this data set is publicly available on the Workflow4metabolomics.org e-infrastructure with two reference histories: 'W4M00002_Sacurine-comprehensive' corresponds to the preprocessing of the .mzML files, followed by signal drift and batch effect correction, normalization, filtering, statistics, and annotation of the peak table; 'W4M00001_Sacurine- statistics' starts with the peak table restricted to the 113 identified metabolites (see Roux et al. [1] for a full description and information about the annotation), and contains the statistical analysis (as described in associated publication except that the publication also describes the positive ionization mode). The intensities of the table provided in the m_sacurine.txt ISA file correspond to the peak table restricted to the 113 identified metabolites (i.e. are identical to the input of the 'W4M00001_Sacurine-statistics' history). Note that in both histories, the HU_096 sample is filtered out during the Hotelling/Quantile/MissingValue quality control sample filter, leading to 183 samples for the subsequent statistical analyzes. Notes: The 'sampling' field indicates the 9 successive weeks during which samples were collected. The 'subset' field indicates a subset of 36 files (6 blanks + 10 QCs + 20 samples) which still contain significant physiological variations (and can be used as e.g. demo or teaching material).</p><p> Acknowledgements: The authors are grateful to Philippe Rocca-Serra for his help in preparing the ISA files.</p><p><br></p><p> References:</p><p> [1] Roux A, Xu Y, Heilier JF, Olivier MF, Ezan E, Tabet JC, Junot C. 2012. Annotation of the Human Adult Urinary Metabolome and Metabolite Identification Using Ultra High Performance Liquid Chromatography Coupled to a Linear Quadrupole Ion Trap-Orbitrap Mass Spectrometer. Anal Chem. Aug 7;84(15):6429-37. doi: 10.1021/ac300829f.</p>
Project description:We wanted to find out the transcriptomic response of growth-arrested Cryptococcus yeast cells when initially placed in environments in which they could reactivate or "wake up", focusing on the difference between a rich microbial media (YPD) and a common cell culture media, RPMI + 10% heat-inactivated fetal calf serum. Please contact Edward.Wallace@ed.ac.uk if you use this data and ask for citation information; we are currently (August 2020) working on a publication.
Project description:This dataset contains several sponge-derived bacteria, along with data from the sponges to enable the assignation of the biosynthetic source of detected metabolite features. Media controls and solvent blanks are also included. Please see metadata for the bacterial source sponge.
Project description:Expression data for Desulfovibrio alaskensis strain G20 and mutants in regulator proteins grown on lactate sulfate media. Pellets collected at mid-log growth phase. We aimed to confirm or expand the predicted regulons of each of the transposon interrupted regulator mutants.
Project description:Global transcriptional profiling of Bacillus subtilis cells comparing wild-type to a ccpN (yqzB) non polar mutant. Abstract of associated publication (article accepted): The transcriptional regulator CcpN of Bacillus subtilis has been recently characterized as a repressor of two gluconeogenic genes, gapB and pckA, and of a small non-coding regulatory RNA, sr1, involved in arginine catabolism. Deletion of ccpN impairs growth on glucose and strongly alters the distribution of intracellular fluxes, rerouting the main glucose catabolism from glycolysis to the pentose phosphate (PP) pathway. Using transcriptome analysis, we show that during growth on glucose, gapB and pckA are the only protein-coding genes directly repressed by CcpN. By quantifying intracellular fluxes in deletion mutants, we demonstrate that derepression of pckA under glycolytic condition causes the growth defect observed in the ccpN mutant due to extensive futile cycling through the pyruvate carboxylase, phosphoenolpyruvate carboxykinase, and pyruvate kinase. Beyond ATP dissipation via this cycle, PckA activity causes a drain on tricarboxylic acid cycle intermediates, which we show to be the main reason for the reduced growth of a ccpN mutant. The high flux through the PP pathway in the ccpN mutant is modulated by the flux through the alternative glyceraldehyde-3-phosphate dehydrogenases, GapA and GapB. Strongly increased concentrations of intermediates in upper glycolysis indicate that GapB overexpression causes a metabolic jamming of this pathway and, consequently, increases the relative flux through the PP pathway. In contrast, derepression of sr1, the third known target of CcpN, plays only a marginal role in ccpN mutant phenotypes.
Project description:Human adipose stem and progenitor cells (ASPCs) develop into heterogenous cultures of adipogenic and Structural Wnt-regulated Adipose Tissue resident (SWAT) cells upon induction of adipogenic differentiation. To investiagte the function of SWAT cells and compare them with proliferating ASPCs, we enriched the SWAT cells from the adipogenic cells using density gradient centriguation. The enriched SWAT cells were cultured for 24 hours in proliferation media or differentiation media for 24 hours. 4 density gradient centrifugations were performed, resulting in 4 technical replicates per media type. We included proliferating ASPCS (undifferentiated) as control. We then performed gene expression profiling analysis using data from RNA-Seq of 4 samples per condition (proliferating ASPCs, SWAT cells in proliferation media, SWAT cells in differentiation media)